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Investigation on Band Gap of CuO–ZnO Nanocomposite Thin Films and Stability of CuO–ZnO Nanofluids

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Nano-composites are interesting and innovative materials getting global attention of engineers and scientists due to their tunable properties, phase and size dependant characteristics and extended applications. In this present work, nano-composites of CuO/ZnO are synthesized from Copper Sulphate and Zinc Acetate as precursors by sol gel route. The samples were characterized by XRD, FTIR and SEM. Thin films of CuO/ZnO are prepared by thermal spray process with different proportions of CuO/ZnO and drying temperatures of 200 °C, 400 °C and 600 °C. Taucs plot is used to calculate the band gap of CuO/ZnO at different proportions and temperature. Lowest band gap of 1.47 eV is obtained for the thin film prepared by 9:1 ratio of CuO/ZnO dried at 400 °C. CuO/ZnO nano-fluids are prepared by two-step method with water as base fluid in three different proportions of 1:1, 1:9 and 9:1 to identify best stability and differentiate their thermal absorption for Direct absorption solar collectors. The CuO/ZnO nano-fluid prepared with the proportion 1:9 shows a fair stability with a Zeta potential value ranges from –30 mV to +7.5 mV.
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Keywords: BAND GAP; CUO/ZNO; NANOCOMPOSITES; NANOFLUID; SOLAR ABSORPTION

Document Type: Research Article

Publication date: September 1, 2018

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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