Li Qiang, Zhang Weiming, Wang Chao, Ma Jiangwei, Ning Li, Fan Huiqing
School of Materials Science and Engineering, Northwestern Polytechnical University Xi'an 710072 China
State Key Laboratory of Solidification Processing Xi'an 710072 China.
RSC Adv. 2018 Sep 26;8(58):33156-33163. doi: 10.1039/c8ra06247a. eCollection 2018 Sep 24.
Pure phase bismuth ferrite (BiFeO, BFO) nanospheres were synthesized a sol-gel method, and Ag was loaded on the surface of BFO by photodeposition. The effects of the Ag-modification on the morphologies and microstructural characteristics were investigated using transmission electron microscopy (TEM) and X-ray powder diffraction (XRD) analyses. Only BFO peaks but no Ag peaks were observed for all samples in the XRD patterns, which is related to the small size and low loading of Ag. The gas-sensing tests show that the response of 4 mg AgNO modified BiFeO (ABFO4) was 72.62 to 10 ppm Cl at 240 °C, which was 2.5 times higher than that of the pristine BFO. Such outstanding gas sensing performances are attributed to the fact that the presence of Ag not only increases the density of holes and the amount of gas adsorption sites but also has a catalytic effect.
采用溶胶-凝胶法合成了纯相铋铁氧体（BiFeO₃，BFO）纳米球，并通过光沉积法将Ag负载在BFO表面。利用透射电子显微镜（TEM）和X射线粉末衍射（XRD）分析研究了Ag改性对其形貌和微观结构特征的影响。XRD图谱中所有样品均只观察到BFO峰而未观察到Ag峰，这与Ag的小尺寸和低负载量有关。气敏测试表明，4mg AgNO₃改性的BiFeO₃（ABFO4）在240℃下对10ppm Cl₂的响应为72.62，是原始BFO的2.5倍。如此优异的气敏性能归因于Ag的存在不仅增加了空穴密度和气吸附位点的数量，而且还具有催化作用。
