Thermal properties of size-selective nanoparticles: Effect of the particle size on Einstein temperature

Characterizing size related thermal properties of nanoclusters is challenging due to the requirement to accurately control both their average sizes and the size distributions. In this work, temperature-dependent Extended X-ray Absorption Fine Structure spectroscopy and the phenomenological bond-order-length-strength (BOLS) model were employed to investigate the size-dependent Einstein temperature of Au nanoclusters. Theoretical calculations of Einstein temperature and average bond distance for clusters with different sizes agree quantitatively with experiment. The BOLS model is thus useful for predictive understanding of structure and thermal properties in well-defined metal clusters.

[1]  R. Tappero,et al.  Complex structural dynamics of nanocatalysts revealed in Operando conditions by correlated imaging and spectroscopy probes , 2015, Nature Communications.

[2]  R. Nuzzo,et al.  Noncrystalline-to-crystalline transformations in Pt nanoparticles. , 2013, Journal of the American Chemical Society.

[3]  G. Henkelman,et al.  A theoretical and experimental examination of systematic ligand-induced disorder in Au dendrimer-encapsulated nanoparticles , 2013 .

[4]  C. Lamberti,et al.  Thermal effects on Rhodium nanoparticles supported on carbon , 2013 .

[5]  R. Nuzzo,et al.  Influence of adsorbates on the electronic structure, bond strain, and thermal properties of an alumina-supported Pt catalyst. , 2012, ACS nano.

[6]  T. Rahman,et al.  Thermodynamic properties of Pt nanoparticles: Size, shape, support, and adsorbate effects , 2011 .

[7]  A. Frenkel,et al.  Anomalous lattice dynamics and thermal properties of supported size- and shape-selected Pt nanoparticles , 2010 .

[8]  I. Avramov,et al.  Specific heat of nanocrystals , 2008 .

[9]  Q. Mei,et al.  Melting and superheating of crystalline solids: From bulk to nanocrystals , 2007 .

[10]  A. Witkowska,et al.  Local ordering of nanostructured Pt probed by multiple-scattering XAFS , 2007 .

[11]  A. Frenkel,et al.  Geometrical Characteristics of Regular Polyhedra: Application to EXAFS Studies of Nanoclusters , 2007 .

[12]  A. Frenkel,et al.  Size-controlled synthesis and characterization of thiol-stabilized gold nanoparticles. , 2005, The Journal of chemical physics.

[13]  X. Bian,et al.  Melting of Cu nanoclusters by molecular dynamics simulation , 2003 .

[14]  J. Xia,et al.  Magneto-optical properties of diluted magnetic semiconductor quantum dots , 2002 .

[15]  Chang Q. Sun,et al.  Correlation between the Melting Point of a Nanosolid and the Cohesive Energy of a Surface Atom , 2002 .

[16]  Chang Q. Sun,et al.  Bond-order?bond-length?bond-strength (bond-OLS) correlation mechanism for the shape-and-size dependence of a nanosolid , 2002 .

[17]  L. Bartell,et al.  Melting and Freezing of Gold Nanoclusters , 2001 .

[18]  J. Li,et al.  Superheating of nanocrystals embedded in matrix , 2000 .

[19]  K. Lu,et al.  Grain-size dependence of thermal properties of nanocrystalline elemental selenium studied by x-ray diffraction , 1997 .

[20]  Frenkel,et al.  Thermal expansion and x-ray-absorption fine-structure cumulants. , 1993, Physical review. B, Condensed matter.

[21]  Edward A. Stern,et al.  New Technique for Investigating Noncrystalline Structures: Fourier Analysis of the Extended X-Ray—Absorption Fine Structure , 1971 .

[22]  A. Mohs,et al.  Tuning the optical and electronic properties of colloidal nanocrystals by lattice strain. , 2009, Nature nanotechnology.

[23]  Chang Q. Sun.  Size dependence of nanostructures: Impact of bond order deficiency , 2007 .