Title: Characterisation of optical and thermal properties of CdSe quantum dots using photoacoustic technique

Authors: N. Al-Hosiny; A. Badawi; M.A.A. Moussa; R. El-Agmy; S. Abdallah

Addresses: Quantum Optics Lab., Faculty of Science, Taif University, P.O. Box 888, Al-Haweiah, 21974 Taif, Saudi Arabia. ' Quantum Optics Lab., Faculty of Science, Taif University, P.O. Box 888, Al-Haweiah, 21974 Taif, Saudi Arabia. ' Quantum Optics Lab., Faculty of Science, Taif University, P.O. Box 888, Al-Haweiah, 21974 Taif, Saudi Arabia. ' Quantum Optics Lab., Faculty of Science, Taif University, P.O. Box 888, Al-Haweiah, 21974 Taif, Saudi Arabia. ' Quantum Optics Lab., Faculty of Science, Taif University, P.O. Box 888, Al-Haweiah, 21974 Taif, Saudi Arabia

Abstract: Photoacoustic technique (PA) has been applied to study the optical and thermal properties of CdSe quantum dots (QDs) with different particles sizes. CdSe QDs were fabricated by the chemical solution deposition (CD) technique. The PA spectra shifted towards lower absorption energy region with increasing the particle size. The same spectra were compared to those obtained by a regular UV-Vis absorption. The sizes of nanoparticles were estimated using effective mass approximation model (EMA) giving radii ranging from 2.16 nm to 2.62 nm, these values were comparable to those obtained by transmission electron microscope (TEM) and x-ray (XRD diffraction). The thermal diffusivity (D) and thermal conductivity (k) of CdSe QDs were also studied using the PA technique. The calculated values of D and k are at least one order of magnitude larger than that of bulk value.

Keywords: CdSe quantum dots; photoacoustics; optical properties; thermal properties; nanotechnology; cadmium selenide.

DOI: 10.1504/IJNP.2012.048022

International Journal of Nanoparticles, 2012 Vol.5 No.3, pp.258 - 266

Received: 22 Feb 2011
Accepted: 19 Sep 2011
Published online: 20 Aug 2014 *

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