Nanoparticle size-dependent lowering of temperature for phase transition from In(OH)(3) to In2O3

作者：Singh VN; Mehta BR^*

来源：Journal of Nanoscience and Nanotechnology, 2005, 5(3): 431-435.

DOI：10.1166/jnn.2005.056

• indium oxide
• indium hydroxide
• nanoparticles and phase transformation temperature

Phase transformation of In(OH)(3) to In2O3 has been studied as a function of nanoparticle size without any alteration of nanoparticle size during transformation. Chemically capped In(OH), nanoparticles having sizes of 15, 11, and 8 nm transform to In2O3 at temperatures of 285, 272, and 255 degrees C, respectively. This first-time unambiguous observation of size-dependent lowering of transformation temperature represents a thermodynamic characteristic of the nanoparticle system. The results have been explained in terms of a lower cohesive energy of surface atoms and an increase in surface-to-volume ratio with a decrease in nanoparticle size.

• 出版日期2005-3