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Tuning the electronic and structural properties of WO3 nanocrystals by varying transition metal tungstate precursors

机译：通过改变过渡金属钨酸盐前体来调节WO3纳米晶体的电子和结构性质

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摘要

Oxygen vacancy is one type of the most important defects affecting the photocatalytic performance of WO3. In this paper, WO3 nanoplates with a high density of oxygen vacancies were synthesized from MWO4 (M = Zn, Cd, Co, Ni) precursors using a sacrificial template method. The structures and morphologies of WO3 nanoplates were investigated by field emission scanning electron microscopy (FE-SEM), high resolution Transmission Electron Microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis, Photoluminescence (PL), Diffuse Reflectance UV-Vis (DRS UV-Vis) and Time-correlated single-photon counting (TCSPC). The metal tungstates were found to not only act as the precursors but also as structure-directing agents during the growth of WO3 nanoplates. XRD data revealed that two phases of WO3 center dot xH(2)O (x = 1 or 2) were obtained after acid treatment of MWO4. WO3 nanoplates derived from NiWO4 were found to have the highest ratio of WO3 center dot 2H(2)O, highest concentration of oxygen vacancies, narrowest band gap, longest electron-hole recombination time, and in turn the highest rate of photodegradation of azo dye methylene blue. These results show that the structural, electronic and photocatalytic properties of synthesized WO3 nanoplates can be tuned by varying the transition metal tungstate precursors.
机译：氧空位是影响WO3光催化性能的最重要缺陷之一。在本文中，采用牺牲模板法从MWO4（M = Zn，Cd，Co，Ni）前驱体合成了具有高氧空位密度的WO3纳米板。通过场发射扫描电子显微镜（FE-SEM），高分辨率透射电子显微镜（HRTEM），X射线衍射（XRD），X射线光电子能谱（XPS），Brunauer-Emmett研究了WO3纳米板的结构和形态。 -Teller（BET）分析，光致发光（PL），漫反射UV-Vis（DRS UV-Vis）和与时间相关的单光子计数（TCSPC）。发现钨酸金属不仅在WO3纳米板的生长过程中充当前体，而且还充当结构导向剂。 XRD数据表明，对MWO4进行酸处理后，获得了WO3中心点xH（2）O（x = 1或2）的两相。发现NiWO4衍生的WO3纳米板具有最高的WO3中心点2H（2）O比例，最高的氧空位浓度，最窄的带隙，最长的电子-空穴重组时间，以及偶氮染料的光降解速率最高亚甲蓝。这些结果表明，可以通过改变过渡金属钨酸盐前体来调节合成的WO3纳米板的结构，电子和光催化性能。

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