Synthesis, characterization, and dielectric properties of N-butyl aniline capped CdS nanoparticles

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• 作者：Damian C. Onwudiwe ; Tanvir Arfin ; Christien A. Strydom
• 关键词：CdS nanoparticles ; morphology ; dielectric properties ; semiconductor ; electrical properties
• 刊名：Electrochimica Acta
• 出版年：10 January, 2014
• 年：2014
• 卷：116
• 期：Complete
• 页码：217-223
• 全文大小：1860 K

文摘

CdS nanoparticles were prepared by chemical reaction between some cadmium salt (CdSO₄ H₂O and CdNO₃路4H₂O) and thioacetamide (TAA), in the presence of N-butyl aniline (NBA) as a capping group; and denoted by CdS1 and CdS2 respectively. The structural and morphological properties were studied by powdered X-ray diffraction, transmission and scanning electron microscopy (SEM). The optical properties were studied by the ultraviolet-visible and photoluminescence spectroscopy. The particle sizes were influenced by the nature of the cadmium source. The photoluminescence spectra of the nanoparticles show peaks at 630 and 635 nm respectively, which are attributed to the surface defects of the CdS nanoparticles. The dielectric properties of CdS nanoparticles were studied in the temperature range of 25-150 掳C, and at a single frequency of 1 kHz. The dielectric constant, capacitance and conductivity were found to increase with an increase in temperature at 1 kHz, and opposite behaviour were obtained for the dissipation factor and electrical modulus. The dissipation factor and electrical modulus decreased with an increase in temperature at 1 kHz. The activation energies were obtained from conductivity and capacitance. The activation energies obtained from capacitances were slightly higher than the values obtained from conductivity measurements. The electrical conductivity was found to be dependent on the size of the prepared nanoparticles.