Hydrogen photochromism in Nb2O5 powders.
Hydrogen photochromism in Nb2O5 powders.
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DOI：
10.1039/c4cp02834a
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
Lei Pan;Yi Wang;Xianjie Wang;Hui-Ying Qu;Jiupeng Zhao;Yao Li;A. Gavrilyuk
中科院分区：
文献类型：
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作者：
Lei Pan;Yi Wang;Xianjie Wang;Hui-Ying Qu;Jiupeng Zhao;Yao Li;A. Gavrilyuk
本文报道了不同结构的Nb_2O_5粉末的氢致变色现象。通过在不同温度下焙烧Nb2O5·nH2O粉末制备了四种不同的粉末相，并用扫描电子显微镜、结构分析、热重分析、差示扫描量热法和光学光谱对其形貌、结构和电子能带结构进行了表征。多晶型氧化物经过不同的高温处理后，得到了结构不同、性能差异很大的Nb2O5粉末。在Nb2O5的M相和H相中观察到明显的光致变色效应，而其他相的光致变色响应较差。由于Nb_2O_5粉末的电子能带结构和形貌对其光致变色性能有很大的影响，这是由于在光的作用下，氢原子从吸附在氧化物表面的供氢分子上剥离而产生的光致变色。由于这些原因，在H相中获得了显著的光致变色效应。
In this paper, we report on the hydrogen photochromism in Nb2O5 powders with different structures. Four different powder phases were prepared by calcining Nb2O5·nH2O powders at various temperatures, and their morphology, structure, and electronic band structure were characterized by scanning electron microscopy, structural analyses, thermogravimetric analysis, differential scanning calorimetry, and optical spectroscopy. Nb2O5 powders with different structures and very different properties were formed after different high-temperature treatments of the polymorphous oxide. A pronounced photochromic effect was observed in the M and H phases of Nb2O5, whereas the other phases exhibited poor photochromic responses. Because photochromism arises due to the detachment of hydrogen atoms under the action of light from hydrogen donor molecules previously adsorbed on the oxide surface, the electronic band structure and the morphology have strong influences on the photochromic properties of Nb2O5 powders. For these reasons, a pronounced photochromic effect was achieved in the H phase.