Synthesis of Cadmium and its Oxide Nanomaterials by Pulsed Laser Ablation in Aqueous Media
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1074-I10-47
Synthesis of Cadmium and its Oxide Nanomaterials by Pulsed Laser Ablation in Aqueous Media Subhash Chandra Singh, Rajkumar Swarnkar, and Ram Gopal Physics, Allahabad University, Laser Spectroscopy and Nanomaterials Lab, Allahabad, 211002, India ABSTRACT: Cadmium based oxide and hydroxide nanocomposites material is synthesized by pulsed laser ablation of cadmium metal in the double distilled water. A piece of cadmium metal, placed on the bottom of glass vessel containing double distilled water, was irradiated with 1064 nm of pulsed Nd:YAG laser operating at 35 mJ/pulse energy and 10 ns pulse width for 30 minutes. Colloidal solution of produced Nanoparticles is found stable for two days. Fine white colored powder is obtained after drying centrifuged solution. UV-visible absorption of colloidal solution, XRD, TGA, DTA and FTIR of the powder is used for the characterization of material. Possible mechanism of synthesis and hydroxide to oxide transition is discussed. INTRODUCTION: Lasers and nanomaterials both are found highly emergent field of research in the recent days. Lasers have open new doors in the field of material synthesis and their characterizations. Synthesis of amorphous and nanostructured thin films by pulsed laser deposition in gas phase is well known from decades. Nanodimmensional Oxide/ Hydroxide composite materials of IIB transition metals have shown their great interest in the fabrication of electronic, optoelectronic, sensing as well as non-conventional energy producing and storing devices, due to their compositional tuning. The high electrical conductivity and optical transmittance properties of these group materials mainly in the visible region of solar spectrum along with a moderate refractive index, makes these materials most suitable for modern technologies. II-VI semiconductor nanocrystals have wider direct band gap and higher optoelectronic efficiencies compared to III-V and indirect band gap conventional group IV semiconductor crystal cousins. Therefore, II-VI semiconductor oxides are considered as a reliable material for the fabrication of visible and near UV LEDs [1], Solar cells [2, 3], modulators and wave-guides etc. High efficiency and large fill factor of ZnO solar cells [2] have increased importance of these group materials in the fabrication of other optoelectronic devices. There are a lot of work on the ZnO, ZnS, ZnSe, CdSe and CdTe semiconductor oxides nanocrystals of this group but only few reports on the cadmium based oxide and hydroxide. It is expected that CdO may enhance optical and electronic efficiencies of present devices based on other II-VI semiconductor oxide cousins. Therefore, it is highly desirable to synthesize and study the nanomaterials of CdO and place this important semiconductor alongside other II–VI semiconductors such as CdS, CdSe and CdTe Nanocrystyals. Synthesis of metal nanoparticles are reported by several workers using pulsed laser ablation in liquid media [4-8], but there are few reports on metal oxide [9,10] nanoparticles synthesized by this
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