Title :
Effect of electrostatic interaction on blue shifts of optical absorption edges of SnO2 nanocrystallites
Author :
Feng, Xia ; Lin, Wenzhi ; Kang, Junyong
Author_Institution :
Dept. of Phys., Xiamen Univ., China
Abstract :
Aqueous sols having SnO2 crystallites with average diameter less than 2 nm were prepared by ultra-filtration with a flat sheet membrane. Ultraviolet absorption measurements were carried out for the original and ultra-filtrated SnO2 aqueous sols. Distinct blue shifts are exhibited in the spectra of both the ultra-filtrated acidic and alkaline SnO2 aqueous sols. Mean electrostatic interaction energies of O and Sn ions in the nanoparticles are obtained from a classical point charge model of the rutile-type structure. The calculated results suggest that the increase of the interaction energy difference between the O and Sn ions as decrease of particle size may be responsible for blue shift of the ultra-filtrated SnO2 crystallites.
Keywords :
electrostatics; nanoparticles; particle size; semiconductor materials; sols; spectral line shift; tin compounds; ultraviolet spectra; 2 nm; SnO2; SnO2 aqueous sols; SnO2 nanocrystallites; blue shift; classical point charge model; crystallite diameter; electrostatic interaction effect; electrostatic interaction energies; optical absorption edges; ultra-filtration; ultraviolet absorption; Biomembranes; Crystallization; Crystals; Electromagnetic wave absorption; Electrostatic measurements; Nanoparticles; Optical sensors; Photonic band gap; Physics; Tin;
Conference_Titel :
Solid-State and Integrated-Circuit Technology, 2001. Proceedings. 6th International Conference on
Print_ISBN :
0-7803-6520-8
DOI :
10.1109/ICSICT.2001.982177
