Evaporation Anisotropy of Free Nanocrystals

被引：10

作者：

Ma, Xiaofei

Lall, Anshuman A.

Mulholland, George W.

Zachariah, Michael R. ^{[1
]}

机构：

[1] Univ Maryland, Dept Mech Engn, College Pk, MD 20742 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 34期

关键词：

OXIDATION-KINETICS; SURFACE; METALS; PARTICLES; DIFFUSION; ENERGY;

D O I：

10.1021/jp206174u

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report observations of the evaporation anisotropy of substrate-free Zn nanocrystals (NCs) as imaged from electron microscopy and determine the onset temperature of evaporation as a function of NC size by the gas-phase ion-mobility method. The observed shape transformation of free NCs is fundamentally different from those observed in traditional hot-stage TEM heating experiments. The onset temperature for evaporation decreases as the NC size decreases and is analogous to the Kelvin effect. The cohesive energy of bulk Zn is determined to be 1.8 +/- 0.1 eV from the size-dependent evaporation data. A mechanism based on crystal face dependent surface melting is proposed to explain the evaporation anisotropy effect.

引用

收藏

页码：16941 / 16946

页数：6

相关论文

共 39 条

[1] Shape-controlled synthesis of colloidal platinum nanoparticles [J].

Ahmadi, TS ;

Wang, ZL ;

Green, TC ;

Henglein, A ;

ElSayed, MA .

SCIENCE, 1996, 272 (5270) :1924-1926

[2] EXPERIMENTAL-EVIDENCE FOR QUASIMELTING IN SMALL PARTICLES [J].

AJAYAN, PM ;

MARKS, LD .

PHYSICAL REVIEW LETTERS, 1989, 63 (03) :279-282

[3] Melting of gold clusters [J].

Cleveland, CL ;

Luedtke, WD ;

Landman, U .

PHYSICAL REVIEW B, 1999, 60 (07) :5065-5077

[4] The physics of premelted ice and its geophysical consequences [J].

Dash, J. G. ;

Rempel, A. W. ;

Wettlaufer, J. S. .

REVIEWS OF MODERN PHYSICS, 2006, 78 (03) :695-741

[5] Novel method to classify aerosol particles according to their mass-to-charge ratio - Aerosol particle mass analyser [J].

Ehara, K ;

Hagwood, C ;

Coakley, KJ .

JOURNAL OF AEROSOL SCIENCE, 1996, 27 (02) :217-234

[6] Some interesting properties of metals confined in time and nanometer space of different shapes [J].

El-Sayed, MA .

ACCOUNTS OF CHEMICAL RESEARCH, 2001, 34 (04) :257-264

[7] ANISOTROPIC DIFFUSION AT A MELTING SURFACE STUDIED WITH HE-ATOM SCATTERING [J].

FRENKEN, JWM ;

HINCH, BJ ;

TOENNIES, JP ;

WOLL, C .

PHYSICAL REVIEW B, 1990, 41 (02) :938-947

[8] Metal/semiconductor core/shell nanodisks and nanotubes [J].

Gao, PX ;

Lao, CS ;

Ding, Y ;

Wang, ZL .

ADVANCED FUNCTIONAL MATERIALS, 2006, 16 (01) :53-62

[9] Ab initio correlation calculations for the ground-state properties of group-12 metals Zn and Cd [J].

Gaston, Nicola ;

Paulus, Beate .

PHYSICAL REVIEW B, 2007, 76 (21)

[10] Multiple minima on the energy landscape of elemental zinc:: A wave function based ab initio study [J].

Gaston, Nicola ;

Paulus, Beate ;

Wedig, Ulrich ;

Jansen, Martin .

PHYSICAL REVIEW LETTERS, 2008, 100 (22)

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