Influence of W doped ZrV2O7 on structure, negative thermal expansion property and photocatalytic performance

• Published in: Applied surface science Vol. 313; pp. 41 - 47
• Main Authors: Liu, Qinqin, Yang, Juan, Sun, Xiujuan, Cheng, Xiaonong, Tang, Hua, Li, Haohua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2014
• Subjects: Diffraction; Doping; Field emission; negative thermal expansion; Photocatalysis; photocatalytic activity; Scanning electron microscopy; Sol gel process; Stabilization; Thermal expansion; ZrV2-xWxO7+δ; photocatalytic activity; ZrV2-xWxO7+δ; negative thermal expansion
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2014.05.120

(a) TEM image and (b) Polyhedral representation of ZrV1.6Mo0.4O7.2; (c) Thermal expansion curves and (d) Degradation curves of ZrV2−xWxO7+δ (x=0, 0.1, 0.2, 0.3, and 0.4). •Novel ZrV2−xWxO7+δ solid solutions were first prepared by sol–gel method.•W6+ doping has influence on the crystal structure.•ZrV1.6W0.4O7.2 shows negative thermal expansion during its corresponding temperature.•W6+ doped ZrV2O7 exhibits superior photocatalytic active than that of pure sample. Tungsten-doped ZrV2O7 having good photoactivities under UV-light excitation for the degradation of Rhodamine B has been synthesized by sol–gel method. As-prepared samples were examined by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, UV–vis absorption and photoluminescence spectroscopy. From the structural and morphological characterization it has been stated that the presence of W6+ induces the progressive stabilization of normal phase with 1×1×1 cubic structure (centric space group Pa3¯ (Z=4)). ZrV1.6W0.4O7.2 shows negative thermal expansion (NTE) at room temperature while ZrV2−xWxO7+δ with other ratios show positive thermal expansion. Mechanism for this change in thermal expansion property was discussed. ZrV1.6W0.4O7.2 also exhibits best photocatalytic performance, the reason is that the occurrence of W6+ doping ZrV2O7 system ZrV2O7 system induces the higher photocatalytic activities by promoting the separation of photo-induced electron-hole pairs. PL analysis provides clear evidence of the lower charge carrier recombination in tungsten-doped systems.