II-VI semiconductor nanoparticles formed by Langmuir-Blodgett film technique: Optical study

NABOK, A. V., RAY, A. K., HASSAN, A. K. and RUBAN, A. (2002). II-VI semiconductor nanoparticles formed by Langmuir-Blodgett film technique: Optical study. In: 2nd IEEE Conference on Nanotechnology, Washington, D.C., Aug 26-28, 2002.

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Abstract

CdS nanoparticles formed within Langmuir-Blodgett (LB) films of stearic acid and calix[8]arene were studied with different optical methods including surface plasmon resonance (SPR), ellipsometry, UV-visible absorption and fluorescence spectroscopy. For the first time, the process of formation of CdS nano-particles within LB films was monitored in-situ with SPR. The results of ellipsometry, SPR and UV-vis absorption spectroscopy were analysed to evaluate simultaneously the thickness, refractive index and extinction coefficient of LB films. It was shown that all three parameters increase as a result of formation of CdS nano-particles. Photoluminecsence measurements confirmed directly the blue spectral shift caused by CdS particles formation, a fact previously observed with UV-vis absorption spectroscopy. A large Stock's shift of the luminescence band can be related to the formation of "dark excitons" in the pallet-type CdS nano-clusters.

Item Type: Conference or Workshop Item (Paper)
Depositing User: Ann Betterton
Date Deposited: 20 Apr 2010 16:40
Last Modified: 20 Apr 2010 16:40
URI: http://shura.shu.ac.uk/id/eprint/1436

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