WO2.7氮掺杂石墨烯复合材料对氢气传感器灵敏度的影响研究
Study on Effect of WO2.7 Nitrogen Doped Graphene Composites on Sensitivity of Hydrogen Gas Sensors
采用水热-煅烧法制备氧化钨/氮掺杂石墨烯(WO2.7/NG)复合材料,探究其微观结构、界面电子交互对氢气(H2)传感器灵敏度的作用机制。结果表明:WO2.7与NG之间并非简单的物理混合,而是构建具有强电子相互作用的异质界面,二者之间存在强电子转移作用,NG向WO2.7供电子,调控界面电子结构。在200 μL/L H2、160 ℃条件下,WO2.7/NG-10的灵敏度达10,远高于WO2.7,且响应时间和恢复时间仅为18 s和22 s。500次弯曲循环后,其电阻变化率仅1.02,柔性稳定性最优。研究表明,WO2.7/NG复合材料通过小尺寸效应和界面电子耦合协同增强H2吸附与电荷传递效率。文章为低功耗、高灵敏柔性H2传感器的开发提供参考。
WO2.7/nitrogen-doped graphene (WO2.7/NG) composites were prepared by a hydrothermal-calcination method, and the influence mechanisms of their microstructure and interfacial electronic interaction on the sensitivity of hydrogen (H2) sensors were investigated. The results demonstrated that WO2.7 and NG were not simply physically mixed, but rather constructed a heterointerface with strong electronic interaction. A pronounced electron transfer occurred between the two components, with NG donating electrons to WO2.7 and thereby modulating the interfacial electronic structure. Under the conditions of 200 μL/L H2 and 160 ℃, the sensitivity of WO2.7/NG-10 reached 10, which was significantly higher than that of WO2.7, and the response time and recovery time were merely 18 s and 22 s, respectively. After 500 bending cycles, its resistance change rate was only 1.02%, exhibiting optimal flexible stability. The study revealed that the WO2.7/NG composites synergistically enhanced H2 adsorption and charge transfer efficiency through the small size effect and interfacial electronic coupling. The paper provides guidance for the development of low-power-consumption, high-sensitivity flexible H2 sensors.
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中国石化集团公司科技项目(123072)
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