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Dielectric, optical and enhanced photocatalytic properties of CuCrO2 nanoparticles

机译：CuCrO 2 纳米粒子的介电，光学和增强的光催化性能

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Herein, delafossite CuCrO2 nanoparticles were synthesized through a polymeric citrate precursor method, followed by heating at 900 °C in air. The BET surface area of the CuCrO2 nanoparticles was found to be 235 m2 g?1, which was more than 500 times that of bulk CuCrO2 (0.47 m2 g?1) and 2–4 times that of the reported CuCrO2 nanoparticles (50–100 m2 g?1) (Y.-T. Nien et al., Mater. Chem. Phys., 2016, 179, 182–188 and D. Xiong et al., J. Mater. Chem., 2012, 22, 24760–24768). In the photoluminescence spectra of the CuCrO2 nanoparticles, a strong luminescent emission peak was observed at ～460 nm in the blue light region. The resulting transmittance value of the CuCrO2 nanoparticles was found to be 77% in the visible region, and the direct band gap energy was determined to be 3.09 eV via UV-vis spectroscopy. The dielectric properties as a function of frequency and temperature and photocatalytic degradation of the organic pollutants in an aqueous solution were also investigated. CuCrO2 nanoparticles also showed remarkable enhancement in the catalytic degradation of methylene blue in H2O under sunlight irradiation. The plausible fragmentation and the structural changes in the methylene blue molecule were further demonstrated via mass spectrometry.
机译：在此，通过聚合柠檬酸盐前体方法合成了铜铁矿CuCrO 2 纳米颗粒，然后在空气中于900°C加热。发现CuCrO 2 纳米粒子的BET表面积为235 m 2 g ？1 ，是块状CuCrO 2 的500倍（0.47 m 2 g ？1 ）和已报道的CuCrO 2 纳米粒子的2-4倍（ 50–100 m 2 g ？1 ）（Y.-T。Nien 等。 ，材料化学物理学，2016、179、182–188和D. Xiong 等人， J。Mater。Chem。 ，2012，22，24760-24768）。在CuCrO 2 纳米颗粒的光致发光光谱中，在蓝光区的〜460 nm处观察到了很强的发光峰。发现CuCrO 2 纳米粒子在可见光区域的透射率值为77％，通过带电确定的直接带隙能为3.09 eV 紫外可见光谱。还研究了介电性能随频率和温度的变化以及水溶液中有机污染物的光催化降解。 CuCrO 2 纳米粒子在阳光照射下还显着增强了H 2 O中亚甲基蓝的催化降解。通过质谱进一步证实了亚甲基蓝分子中可能的断裂和结构变化。

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