ライフサイエンスコーパス: metal nanoparticle

1 microring, Fabry-Perot cavity, and plasmonic metal nanoparticle.

2 ocalized surface plasmon resonance (LSPR) of metal nanoparticle.

3 tical ones, implying the selective growth of metal nanoparticles.

4 logy, for the particular case of anisotropic metal nanoparticles.

5 ty and plasmonic properties of DNA-assembled metal nanoparticles.

6 interest due to unique optical properties of metal nanoparticles.

7 n of fluorescent molecules coupled to single metal nanoparticles.

8 W.m(-1).K(-1)) owing to the existence of Al metal nanoparticles.

9 de supports on reactions electrocatalyzed by metal nanoparticles.

10 pered by large analyte losses, especially of metal nanoparticles.

11 size, shape, morphology, and composition of metal nanoparticles.

12 (Pt, Co, and Ni) or alloyed (PtCo and PtNi) metal nanoparticles.

13 ed on localized surface plasmon resonance in metal nanoparticles.

14 ic properties and surface chemistry of small metal nanoparticles.

15 of reducing metal salts to the corresponding metal nanoparticles.

16 eakening was recently revealed in ultrasmall metal nanoparticles.

17 on mechanisms, fate, and toxicity of natural metal nanoparticles.

18 can be achieved by optimizing the density of metal nanoparticles.

19 ill not clear, even for H(2) dissociation on metal nanoparticles.

20 he graphene and hBN membranes with catalytic metal nanoparticles.

21 le nanomagnets based on carbon-coated cobalt metal nanoparticles.

22 een organometallic compounds and crystalline metal nanoparticles.

23 lized surface plasmon resonance of colloidal metal nanoparticles.

24 well as its ability to organize and disperse metal nanoparticles.

25 cubic phases have not been reported in noble metal nanoparticles.

26 n various routes of synthesis of these noble metal nanoparticles.

27 based on the organic compound TMB instead of metal nanoparticles.

28 g colloidal structures assembled from simple metal nanoparticles.

29 requirement is met only at the perimeters of metal nanoparticles.

30 with the presence of surface oxide layer of metal nanoparticles.

31 mon hot spots, in anisotropic (nonspherical) metal nanoparticles.

32 Ligand exchange is a fundamental reaction of metal nanoparticles.

33 paration of catalytically active and durable metal nanoparticles.

34 lows for precise and efficient patterning of metal nanoparticles.

35 to the metal, yielding inverse FeO(x)-coated metal nanoparticles.

36 probe the binding of a variety of ligands to metal nanoparticles.

37 catalysis on surfaces of strongly plasmonic metal nanoparticles.

38 t metal oxide materials decorated with noble metal nanoparticles advance visible light photocatalytic

39 a new electronic signaling mechanism in the metal nanoparticle affinity, different to the intuitive

40 Small noble-metal nanoparticles (Ag or Au) are directly synthesized

41 been shown that photoexcitation of plasmonic metal nanoparticles (Ag, Au and Cu) can induce direct ph

42 Silica-coated metal nanoparticles allow these systems to be combined w

43 such as QD interactions with gold and other metal nanoparticles along with carbon allotropes are als

44 iable sensors based on ligand-functionalized metal nanoparticles also known as monolayer-protected na

45 While the electronic signaling capability of metal nanoparticle analogues is demonstrated by a graphe

46 rk affords the rational design of transition metal nanoparticles anchored on pyrochlore oxide heterog

47 uctures and organize other materials such as metal nanoparticles and could in principle be used to nu

48 derstanding of the optical response of noble-metal nanoparticles and in the probing, analysis and vis

49 chemistry in the photoluminescence of small metal nanoparticles and largely rule out other mechanism

50 an innovative strategy for preparing shaped metal nanoparticles and make significant progress in the

51 enation of propylene in reactors packed with metal nanoparticles and metal-organic framework catalyst

52 d to direct the positioning and alignment of metal nanoparticles and nanorods.

53 Key advances in the synthesis of noble metal nanoparticles and nanostructures have resulted in

54 s, with particular emphasis on inks based on metal nanoparticles and nanowires, carbon nanotubes, and

55 taking advantage of the synergy between the metal nanoparticles and oxide support.

56 an be improved by synergic properties of the metal nanoparticles and polymer network with biomolecule

57 a new approach to the synthesis of Ga-based metal nanoparticles and provides the basis for its exten

58 ic effect of the charge transfer between the metal nanoparticles and semiconductive components.

59 and-mediated layer-by-layer assembly between metal nanoparticles and small organic molecules, the aut

60 Control over the optical response of metal nanoparticles and their associated plasmons is cur

61 The natural existence of metal nanoparticles and their oxides/sulfides in waters,

62 port metallurgy on the nanoscale to generate metal nanoparticles and their simultaneous patterning in

63 e structures consisting of a QD coupled to a metal nanoparticle, and assembled into an ordered nanoar

64 kes a great use of supported late-transition-metal nanoparticles, and bimetallic catalysts often show

65 N-doped carbon and carbon nitride supported metal nanoparticles, and concentrates on the catalytic e

66 e to increased electron density at the noble-metal nanoparticles, and demonstrate the universality of

67 ne flakes, biological particles, SERS-active metal nanoparticles, and high-refractive semiconductor n

68 r/quartz interface and that reflected by the metal nanoparticles, and the resulting interference effe

69 etites are often found with other transition metal nanoparticles, and they display rounded crystal mo

70 Metal nanoparticles are commonly supported on metal oxid

71 Supported metal nanoparticles are essential components of high-per

72 The remarkable optical properties of metal nanoparticles are governed by the excitation of lo

73 Non-noble metal nanoparticles are notoriously difficult to prepare

74 Bimetallic hollow, porous noble metal nanoparticles are of broad interest for biomedical

75 icient ligand-free first-row late transition-metal nanoparticles are prepared and compared.

76 article synthesis where non-spherical hollow metal nanoparticles are routinely prepared and used.

77 Metal nanoparticles are used as catalysts in a variety o

78 heir advantageous material properties, noble metal nanoparticles are versatile tools in biosensing an

79 Oxide-supported precious metal nanoparticles are widely used industrial catalysts

80 er of a noble metal on relatively cheap core-metal nanoparticles, are fascinating and promising fuel

81 n of localized surface plasmon resonances in metal nanoparticle arrays.

82 ions of isolated or weakly-interacting noble-metal nanoparticles, as encountered in experiments, whil

83 activity, as hosts for the incorporation of metal nanoparticles, as precursors for the manufacture o

84 a method for quantification of the number of metal nanoparticles at the single-cell level.

85 occur in light-mediated self-organization of metal nanoparticles; atoms are replaced by silver nanopa

86 ovide a general methodology in the design of metal-nanoparticle-based catalysts for a broad range of

87 Again, we have pointed out the impact of the metal-nanoparticle-based surface energy transfer process

88 ried out on a massively parallel scale using metal nanoparticle building blocks of specific shape.

89 y growing the secondary metal on the primary metal nanoparticle but not on the support; meanwhile, th

90 izing optical metamaterials based upon noble metal nanoparticles by enabling the crystallization of l

91 The properties of ultrasmall metal nanoparticles (ca. 10-200 metal atoms), or monolay

92 ht-excited metal electrons on the surface of metal nanoparticles can activate the adsorbed reactant m

93 The catalytic and optical properties of metal nanoparticles can be combined to create platforms

94 Since metal nanoparticles can be densely implanted as inclusio

95 The adsorption of molecules on metal nanoparticles can be sterically controlled through

96 apping, and the size of thermally evaporated metal nanoparticles can be tuned by either post heat tre

97 The plasmonic properties of metal nanoparticles can change significantly with change

98 electron reactivity are chosen, immobilized metal nanoparticles can exhibit a highly enhanced chemic

99 Metal nanoparticles can generate gigantic field enhancem

100 Metal nanoparticles can induce cell death, yet the toxic

101 work, we discovered that light scattering of metal nanoparticles can provide 3D imaging contrast in i

102 ents of the circuitry can be interfaced with metal nanoparticles capable of sensing various environme

103 Metal nanoparticles-carbon nanotube modified glassy carb

104 oxygen reduction reaction (ORR) kinetics of metal nanoparticle catalysts between 500 and 600 degrees

105 gy for preparing highly dispersed, ultrafine metal nanoparticle catalysts on an electroactive polymer

106 Unlike metal nanoparticle catalysts, zirconia-based growth shou

107 age consistently found with nanotube-bearing metal nanoparticle catalysts.

108 cle catalysts versus typical oxide-supported metal nanoparticle catalysts.

109 Atomic-scale insights into how supported metal nanoparticles catalyze chemical reactions are crit

110 ause of widespread use, but it is unclear if metal nanoparticles cause effects directly or indirectly

111 ar, prevented their use in the design of all-metal nanoparticle circuitry.

112 swers to the question "How and why anchoring metal nanoparticles, clusters, or single atoms on carbon

113 ning the formation and dissociation rates of metal-nanoparticle complexes in defining the relaxation

114 portant new synthetic route to control final metal nanoparticle composition and composition architect

115 etallic (or plasmonic) to molecular state in metal nanoparticles constitutes a central question in na

116 ectret (poly(2-vinyl naphthalene) (PVN)) and metal nanoparticles (Copper).

117 th Raman reporter-functionalized SERS-active metal nanoparticles (core/satellite silver nanoparticles

118 al/metal oxide nanoparticles, polymer-coated metal nanoparticles, dendrimers, micelles and star polym

119 analogous to the electrochemical behavior of metal nanoparticles described by Plieth's model.

120 The newfound metal nanoparticle diffusion phenomenon effectively crea

121 The incorporation of noble metal nanoparticles, displaying localized surface plasmo

122 plasmon resonance (LSPR) occurring in noble metal nanoparticles (e.g., Au) is a widely used phenomen

123 new properties derived from the presence of metal nanoparticles (e.g., bacteriostaticity, increased

124 ent of an expanded graphite embedded with Al metal nanoparticles (EG-MNPs-Al) synthesized by an oxida

125 fiber Bragg grating (TFBG) coated with noble metal nanoparticles, either gold nanocages (AuNC) or gol

126 Plasmonic metal nanoparticles enhance chemical reactions on their

127 hich utilizes oscillating electric fields of metal nanoparticles, enhancing the overall electric fiel

128 hesis, stability, and toxicity of engineered metal nanoparticles (ENPs) have been extensively studied

129 vacancies and dopants such as Ni that afford metal nanoparticle exsolution.

130 periments and in electrodeposition of single metal nanoparticles for electrocatalytic studies because

131 Supported metal nanoparticles form the basis of heterogeneous cata

132 four-step mechanism of supported transition-metal nanoparticle formation in contact with solution: s

133 Recent work with this prototype transition-metal nanoparticle formation system revealed that nuclea

134 rticle, the physical distance separating the metal nanoparticle from the organic dye, and the spectra

135 tronic circuits can be made exclusively from metal nanoparticles functionalized with charged organic

136 ar, the near-field coupling between adjacent metal nanoparticles gave rise to strongly localized elec

137 Although metal nanoparticle/graphene composites have been widely

138 polyelectrolyte coatings, magnetic and noble metal nanoparticles, hard mineral shells and other compl

139 dent ultrasensitive LSPR properties of noble metal nanoparticles has a great potential for fabricatio

140 (VSCR) between small-molecule reactants and metal nanoparticles has been demonstrated in several stu

141 Structural evolution in metal nanoparticles has been known to progress from mult

142 nsights on high surface area oxide supported metal nanoparticles has been limited by less than atomic

143 plasmon resonance (LSPR) excitation of noble metal nanoparticles has been shown to accelerate and dri

144 ocalized surface plasmon resonance (LSPR) of metal nanoparticles has emerged as an appealing alternat

145 Chiral noble metal nanoparticles has recently gained great interest d

146 Noble metal nanoparticles have been extensively studied to und

147 Aggregated metal nanoparticles have been known to display significa

148 configurations of surface atoms on supported metal nanoparticles have different catalytic reactivity

149 Noble-metal nanoparticles have had a substantial impact across

150 and the optical and catalytic properties of metal nanoparticles have led to similar advances in plas

151 ity in selective CO(2) reduction that simple metal nanoparticles have only at interfaces with the sup

152 Metal nanoparticles have significant interaction cross-s

153 bits the excellent characteristics of carbon-metal nanoparticle hybrid conjugation and led to the amp

154 examples of reactions involving unsupported metal nanoparticles (i.e., colloidal nanoparticles).

155 cision required at the nanoscale to position metal nanoparticles in 3D.

156 integrating an easily deformable network of metal nanoparticles in a hydrogel matrix for use as a ca

157 ical significance of the detected endogenous metal nanoparticles in an animal tissue has been demonst

158 and optically mediated assembly of plasmonic metal nanoparticles in DNA-hybridization assays.

159 monitoring of complex environments and noble metal nanoparticles in real time.

160 This is the first report of colloidal metal nanoparticles in the form of single plasmonic subs

161 silver ions and subsequently nucleate silver metal nanoparticles in water.

162 re substantially better than those for other metal nanoparticles, including gold, owing to an effecti

163 accurately describe the optical response of metal nanoparticles, including retardation effects, with

164 Transition metal nanoparticles, including those employed in catalyt

165 Metal nanoparticle infiltration resulted in significantl

166 cation of dynamic 1:1 inclusion complexes of metal nanoparticles inside oxide nanocups with high yiel

167 lity, selectivity, and activity of catalytic metal nanoparticle interfaces represents a challenge to

168 produce composite materials that consist of metal nanoparticles interspersed with the poly-Pd(n)C60

169 followed by electron transfer (ET) from the metal nanoparticle into TiO2.

170 The incorporation of metal nanoparticles into a polymer matrix can effectivel

171 Incorporation of metal nanoparticles into active layers of organic solar

172 ical hierarchical structure with embedded Al metal nanoparticles into the interspaces of expanded gra

173 ombining different semiconducting oxides and metal nanoparticles is as well explored.

174 Engineering the surface ligands of metal nanoparticles is critical in designing unique arra

175 Much of the interest in noble metal nanoparticles is due to their plasmonic resonance

176 rol over charge transfer in carbon-supported metal nanoparticles is essential for designing new catal

177 echanisms of catalytically active transition metal nanoparticles is important to improve their applic

178 The size of metal nanoparticles is one of key factors to strong ligh

179 single-layer graphene sensor decorated with metal nanoparticles is presented.

180 near-field coupling between individual noble metal nanoparticle labels to resolve subdiffraction limi

181 similar vein, polyoxometalates can stabilize metal nanoparticles, leading to additional transformatio

182 ered that pulsed laser irradiation of liquid metal nanoparticles (LMNPs) with tunable conditions can

183 lts occurs spontaneously in the gel to yield metal nanoparticles located on the gel nanofibers.

184 hemical current densities in metal-insulator-metal nanoparticle (M-I-MNP) systems.

185 nobiosensors based on carbon nanostructures, metal nanoparticles, magnetic nanoparticles, silica-base

186 amorphous MOF liquids and glasses, polymers, metal nanoparticles, metal carbide nanoparticles, and ca

187 Nanomaterials such as metal nanoparticles, metal nanoclusters, metal oxide nan

188 rameworks (MOFs) as porous matrices to embed metal nanoparticles (MNPs) and occasionally metal oxide

189 iform pore structures are ideal supports for metal nanoparticles (MNPs) to generate efficient shape-s

190 The release of metal nanoparticles (MNPs) to the environment could be d

191 Composites incorporating metal nanoparticles (MNPs) within metal-organic framewor

192 found that a range of nanomaterials such as metal nanoparticles (MNPs), carbon based nanomaterials,

193 varying the experimental conditions: type of metal nanoparticles, molecular linker (aromatic versus a

194 of the rose petals allows us to concentrate metal nanoparticle (NP) aggregates and analytes onto the

195 Here we design an interface between a metal nanoparticle (NP) and a metal-organic framework (M

196 Metal nanoparticle (NP) films, prepared by adsorption of

197 ssion levels, we demonstrate here that noble metal nanoparticle (NP) immunolabeling in combination wi

198 trode based on an insulating TiO2 film and a metal nanoparticle (NP).

199 To date the self-assembly of ordered metal nanoparticle (NP)/block copolymer hybrid materials

200 r CO(2) hydrogenation, the interface between metal nanoparticles (NPs) and the support material is of

201 Transition metal nanoparticles (NPs) are typically supported on oxi

202 e present a novel approach by which adsorbed metal nanoparticles (NPs) are used for enhancing ET exch

203 various metal ions, which can be reduced to metal nanoparticles (NPs) as a result of thermal anneali

204 demonstrated the compatibility of elemental metal nanoparticles (NPs) as cathode materials for AIBs.

205 Finally, design approaches for metal nanoparticles (NPs) based on size, shape, and supp

206 Surfactant-assisted seeded growth of metal nanoparticles (NPs) can be engineered to produce a

207 Experiments at individual metal nanoparticles (NPs) can provide important informat

208 Electrochemistry at individual metal nanoparticles (NPs) can provide new insights into

209 alumina (Al(2)O(3)) overcoating of supported metal nanoparticles (NPs) effectively reduced deactivati

210 Chemical environment control of the metal nanoparticles (NPs) embedded in nanocrystalline me

211 The noble metal nanoparticles (NPs) exhibit high electrocatalytic

212 Nanostructures decorated with noble metal nanoparticles (NPs) exhibit potential for use in h

213 Many chemical and biosensors based on metal nanoparticles (NPs) have been developed.

214 ugation of organic dyes onto non-luminescent metal nanoparticles (NPs) have greatly broadened their a

215 Since the discovery of metal nanoparticles (NPs) in the 1960s, unknown toxicity

216 pane derivatives under hydrogen catalyzed by metal nanoparticles (NPs) in the liquid phase were studi

217 The use of metal nanoparticles (NPs) in this area is a more recent

218 ogy, surface roughness, and crystallinity of metal nanoparticles (NPs) in two-dimensional (2D) lattic

219 The incorporation of noble metal nanoparticles (NPs) like gold (Au) NPs for the fab

220 bilization events of single electrocatalytic metal nanoparticles (NPs) on an inert electrode.

221 Shape-controlled synthesis of metal nanoparticles (NPs) requires mechanistic understan

222 Semiconductor nanowires (NWs) capped with metal nanoparticles (NPs) show multifunctional and syner

223 lectrospray plume on a surface yielded noble metal nanoparticles (NPs) under ambient conditions.

224 Investigating the collisions of individual metal nanoparticles (NPs) with electrodes can provide ne

225 opolymer micelles and polymer-tethered noble-metal nanoparticles (NPs).

226 factant-assisted synthesized colloidal noble metal nanoparticles (NPs, such as Au NPs) on solids is a

227 Metal nanoparticles of Fe, Co, Ni, Cu, Zn, Cd, In, Bi, a

228 spatiotemporal catalytic behaviors of single metal nanoparticles of various shapes including pseudosp

229 ause the surface plasmon resonances of noble metal nanoparticles offer a superior optical signal and

230 Branched metal nanoparticles often display unique physicochemical

231 polyols, are well-known for the synthesis of metal nanoparticles, often acting as reducing agents, so

232 d with localized surface plasmons excited in metal nanoparticles on a quartz substrate is observed an

233 design that couples current-driven growth of metal nanoparticles on an electrode surface-in close ana

234 owth of a finely dispersed array of anchored metal nanoparticles on an oxide electrode through electr

235 Potential effects of metal nanoparticles on aquatic organisms and food webs a

236 nding of rapid high temperature synthesis of metal nanoparticles on carbon supports and the origin of

237 The as-prepared noble metal nanoparticles on MXene show a highly sensitive SER

238 Rhodium oxide and rhodium metal nanoparticles on niobate and tantalate supports ar

239 ce-enhanced Raman spectroscopy studies using metal nanoparticles on Si/SiO2 substrates.

240 with NaBH4 and the in situ deposition of the metal nanoparticles on the 2D carbon nanomaterial planar

241 n phenomenon, a central platform for growing metal nanoparticles on the surface of host oxides in rea

242 n of localized surface plasmon resonances of metal nanoparticles, one can generate reaction equivalen

243 we demonstrate high-fidelity fabrication of metal nanoparticles, optical nanoantennas, and nanohole

244 generated from either localized plasmons in metal nanoparticles or propagating plasmons in patterned

245 Success has recently been achieved for metal nanoparticles, particularly Au, with diameters up

246 r CeO(2)), which in turn contained dispersed metal nanoparticles (Pd or Pt).

247 face of the two-dimensional (2D) BN with the metal nanoparticles plays a strong role both in guiding

248 thods for brief discussion of fabrication of metal nanoparticles-polymer hybrid materials and their a

249 s and architectures enabled by quantum dots, metal nanoparticles, polymers, nanotubes, nanowires, two

250 Metal nanoparticles prepared by exsolution at the surfac

251 Currently, polymer thin films embedded with metal nanoparticles provided the suitable microenvironme

252 Performing electron-transfer reactions on metal nanoparticles requires separation of charge carrie

253 , such as semiconducting quantum dots (QDs), metal nanoparticles, semiconductor-metal heterostructure

254 tions), creating electronic devices in which metal nanoparticles sense, process and ultimately report

255 rystals with the catalytic activity of small metal nanoparticles show promising applications for phot

256 The spectroscopy of metal nanoparticles shows great potential for label-free

257 ing synthetic protocols that reduce precious metal nanoparticle size and stabilize dispersed species

258 ver, for many applications, colloidal liquid-metal nanoparticle solutions are vital.

259 ental results are illustrated in the case of metal nanoparticles, stressing the key role played by th

260 Noble metal nanoparticles such as gold, silver and platinum ar

261 Some other metal nanoparticles, such as copper, silver, gold, and p

262 Noble metal nanoparticles supporting plasmonic resonances beha

263 , as well as demonstrate the pivotal role of metal nanoparticle surface chemistry in tuning and optim

264 yer adsorbate molecules on differently sized metal nanoparticle surfaces investigated with ultrafast

265 The dynamic restructuring of metal nanoparticle surfaces is known to greatly influenc

266 cement of fluorophores in close proximity to metal nanoparticle surfaces is proposed to enhance sever

267 on unanswered mechanistic questions in noble-metal nanoparticle synthesis and promising directions fo

268 overtakes performances of previous non-noble metal nanoparticles systems, and is even better than som

269 systems, and is even better than some noble metal nanoparticles systems.

270 Liquid metal nanoparticles that are mechanically sintered at an

271 ider the convenient epitope-modifiability of metal nanoparticles, the easy-to-develop analogues for d

272 has a fundamental impact on the formation of metal nanoparticles, thereby favoring the dispersion of

273 A large variety of metal nanoparticle three-dimensional architectures are d

274 nd (iv) transforming each nanoreactor into a metal nanoparticle through thermal annealing.

275 topic of catalysis with colloidal ruthenium metal nanoparticles through the last five years.

276 Brust-Schiffrin syntheses of the respective metal nanoparticles, through which the different reactio

277 Both SLS and VLS methods make use of molten metal nanoparticles to catalyse the nucleation and elong

278 rt a novel analogue made by epitope-modified metal nanoparticles to enable the electronic signaling o

279 ize localized surface plasmon resonance from metal nanoparticles to enhance electromagnetic fields in

280 the details of the transformation from solid metal nanoparticles to hollow metal oxide nanoshells via

281 The synthesis of shaped metal nanoparticles to meet the precise needs of emergin

282 times of energetic charge carriers formed in metal nanoparticles under light illumination.

283 seed refinement leads to unprecedented noble metal nanoparticle uniformities and purities for eight d

284 here is a longstanding challenge to disperse metal nanoparticles uniformly in bulk polymers for wides

285 Identifying the ripening modes of supported metal nanoparticles used in heterogeneous catalysis can

286 technique for determining ligand loading on metal nanoparticles using a variant of secondary ion mas

287 ractionation (ElFFF) for characterization of metal nanoparticles was investigated in this study.

288 ively measure WD kinetics and show that, for metal nanoparticles, WD activity correlates with alkalin

289 However, this model may not be pertinent for metal nanoparticles, which are now understood to be ubiq

290 es is often harnessed for green synthesis of metal nanoparticles, which are relatively less toxic com

291 by rapidly melting and coalescing aggregated metal nanoparticles, which increases the initial size of

292 is afforded by plasmon-mediated syntheses of metal nanoparticles, which use visible light irradiation

293 It has long been a challenge to dope metal nanoparticles with a specific number of heterometa

294 networks from single and binary mixtures of metal nanoparticles with a triblock terpolymer.

295 port a new strategy to synthesize core-shell metal nanoparticles with an interior, Raman tag-encoded

296 ion from molecular to plasmonic behaviour in metal nanoparticles with increasing size remains a centr

297 erate the synthetic design process for noble metal nanoparticles with targeted morphologies.

298 that is, in the analogue-receptor affinity, metal nanoparticles with the charge density lower than r

299 , our studies show high affinity between the metal nanoparticles with the graphene.

300 er in the development of new preparations of metal nanoparticles with well-defined shapes.