Enhanced resistive acetone sensing by using hollow spherical composites prepared from MoO3 and In2O3
Enhanced resistive acetone sensing by using hollow spherical composites prepared from MoO3 and In2O3
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DOI：
10.1007/s00604-019-3471-0
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发表时间：
2019-05
影响因子：
5.7
通讯作者：
Wenhao Jiang;Lingling Meng;Sufang Zhang;X. Chuai;P. Sun;Fangmeng Liu;Xu Yan;Yuan Gao;
中科院分区：
文献类型：
--
作者：
Wenhao Jiang;Lingling Meng;Sufang Zhang;X. Chuai;P. Sun;Fangmeng Liu;Xu Yan;Yuan Gao;
以MoO3和In2O3为原料，采用无模板水热法合成了空心球复合材料。用XRD、FESEM、TEM、XPS等手段对纳米球进行了表征。制备了不同Mo/In复合比样品的气敏元件，并研究了其气敏性能。结果表明，复合材料中Mo：In的比例为1：1时，通常在250 ° C的工作温度下产生最高的响应。当在250 ° C下暴露于100 ppm丙酮时，响应增加到38。这比使用纯MoO3时好13.6倍。该传感器显示出更高的选择性、响应、重复性和长期稳定性。典型的特征包括大的比表面积、高水平的化学吸附氧和缺陷氧位点。用N-N异质结理论解释了MoO_3和In_2O_3复合材料气敏性能的改善。基于该复合材料的传感器在250 ° C下对丙酮表现出非常高的响应（38）和非常快的响应时间（2 s）。
Hollow sphere composites were synthesized by a template-free hydrothermal method from MoO3and In2O3. The spheres have a typical size of 800 ± 50 nm and were characterized by XRD, FESEM, TEM, XPS. Gas sensors based on samples with different Mo/In composite ratios were fabricated and their gas sensing properties were studied. The results show that a Mo:In ratio of 1:1 in the composite gives the highest response, typically at a working temperature of 250 °C. The response increases to 38 when exposed to 100 ppm acetone at 250 °C. This is 13.6 times better than when using pure MoO3. The sensor shows improved selectivity, response, repeatability and long-term stability. Typical features include a large specific surface area, and high levels of chemisorbed oxygen and defective oxygen sites. The N-N heterojunction theory was used to explain the improvement of gas sensing performance.Graphical abstractSchematic presentation of MoO3and In2O3composites and response test graph for 100 ppm acetone. The sensor based on this composite exhibits a very high response (38) to acetone at 250 °C and very fast response time (2 s).