Quantum thermal contraction of Au nanoparticles

W. H. Li, S. Y. Wu, C. C. Yang, F. C. Tsao, S. K. Lai, K. C. Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We report on the successful fabrication of a fine Au powder with a mean particle size of 4 nm. A crossover from a positive thermal expansion at low temperatures to a negative thermal expansion at high temperatures was observed in the fee cell parameter at around 125 K. Using a discrete electronic energy level scheme for nanoparticles, we introduce a weakly temperature dependent level spacing Λ(T) to show how the potential energy is lowered by lattice expansion at low temperatures and by contraction at high temperatures. Anomalies were also observed in the AC magnetic susceptibility and the heat capacity measurements, which can be interpreted by the same model.

Original languageEnglish
Pages (from-to)811-812
Number of pages2
JournalSynthetic Metals
StatePublished - 4 Apr 2003


  • Chemical vapor deposition
  • Electron-solid interaction
  • Equilibrium thermodynamics
  • X-ray diffraction


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