Optical properties of CdS nanoparticles upon annealing

Sivasubramanian, V. ; Arora, A. K. ; Premila, M. ; Sundar, C. S. ; Sastry, V. S. (2006) Optical properties of CdS nanoparticles upon annealing Physica E: Low-dimensional Systems and Nanostructures, 31 (1). pp. 93-98. ISSN 1386-9477

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.physe.2005.10.001

Abstract

The metastable Cubic phase of CdS has been found to be stabilized in the form of nanoparticles. Zinc-blende to Wurtzite structural transformation of CdS nanoparticles, synthesized using chemical precipitation, was investigated using X-Ray Diffraction (XRD), Raman, Photoluminescence (PL) and infraRed (IR) absorption spectroscopy. The nanocrystalline powder was annealed in Argon atmosphere in the temperature range 473-773 K for 2 h at each temperature. The hexagonal fraction increased monotonically during annealing and the shape of the particle becomes anisotropic. PL spectra exhibited a marginal decrease in peak position for annealing up to 573 K and then an increase. In Raman spectra, the intensity of 1-LO phonon decreases while that of 2-LO phonon increases indicating an increase in electron-phonon interaction with increase in particle size. In addition to the Frohlich surface optical phonon mode and TO phonon mode, a new mode at 195 cm−1 is found in IR spectra, which is attributed to a defect-activated zone-boundary phonon. The changes in the optical properties are attributed to those arising from particle growth and structural transformation.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Nanoparticles; Electron-phonon Interaction; Frohlich Mode; Photoluminescence
ID Code:53250
Deposited On:05 Aug 2011 10:37
Last Modified:05 Aug 2011 10:37

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