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Optimization of optical modulation in amorphous WO3 thin films
Jiangbin Su,Xiumei Zhu,Longlong Chen,Yu Liu,Hao Qi,Zuming He,Bin Tang 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.2
WO 3 thin fi lms were prepared on indium-tin oxide (ITO) glass substrates at diff erent substrate temperature by radiofrequency magnetron sputtering. Then the fi lms were soaked in fi ve organic solvents of acetone, ethanol, cyclohexane,acetonitrile and ethyl acetate for 48 h, respectively. The changes in the microstructure, surface morphology and electrochromic(EC) properties of WO 3 thin fi lms before and after the immersion treatment were systematically studied. It wasfound that after soaking in ethanol, the optical modulation of amorphous WO 3 thin fi lms deposited at room temperatureincreased from 50 to 85%, showing excellent EC performance. Moreover, the immersion treatment in ethanol is also helpfulfor improving the EC properties of amorphous WO 3 thin fi lms prepared at elevated substrate temperature. However,after immersion in the other organic solvents, the optical modulation of WO 3 thin fi lms increased less (for acetone: 77%)or even decreased signifi cantly (for cyclohexane, acetonitrile and ethyl acetate: 31%, 30% and 35%, respectively). In addition,the immersion treatment in ethanol cannot improve the optical modulation of crystalline WO 3 thin fi lms prepared at600 °C, which dropped from 58 to 40%. The authors believe that this is mainly related to the diff erent dredging eff ects ofvarious organic solvents on the transport channels of Li-ions and electrons in WO 3 thin fi lms. Therefore, this work providesa new approach for the optimization of EC performance of amorphous WO 3 thin fi lms.
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Yongmei Xia,Zuming He,Jiangbin Su,Ya Liu,Bin Tang,Xiaoping Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6
Novel n-SrTiO3/p-BiOI heterojunction composites were successfully fabricated by loading SrTiO3 particles onto the surface of BiOI nanoflakes via a two-step method. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), energy-disperse X-ray spectroscopy (EDS), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), diffuse reflectance spectroscopy (DRS) and electrochemical measurements. The results show that the n-SrTiO3/p-BiOI heterojunction composites are composed of perovskite structure SrTiO3 and tetragonal phase BiOI. The composites exhibit excellent photocatalytic performance for the degradation of crystal violet (CV) solution under simulated solar light irradiation, which is superior to that of pristine BiOI and SrTiO3. The 30 wt.% SrTiO3/BiOI composite is found to be the optimal composite, over which the dye degradation reaches 92.5% for 30 min of photocatalysis. The photocatalytic activity of the 30 wt.% SrTiO3/BiOI composite is found to be 3.94 times and 28.2 times higher than that of bare BiOI and SrTiO3, respectively. The reactive species trapping experiments suggest that · O-2 and holes are the main active species responsible for the CV degradation. In addition, the electrochemical measurements elucidate the effective separation of photoinduced electron–hole pairs. Moreover, on the basis of experimental and theoretical results, a possible mechanism for the enhanced photocatalytic performance of the SrTiO3/BiOI heterojunction composites is also proposed.
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