聚苯胺(PANI)是一种具有独特电化学特性的π键共轭导电高分子,将其与p型金属氧化物半导体(MOSs)复合可以降低MOSs基气体传感器的工作温度,实现传感器件的低能耗。采用水热-原位聚合两步法制备Co3O4/PANI复合材料,通过促进复合物耦合界面电荷转移及增加活性位点的策略,实现了室温下对低浓度三乙胺(TEA)的检测。研究结果表明,室温(25℃)下Co3O4与苯胺单体摩尔比为5∶6的Co3O4/PANI复合材料对质量浓度100mg/L TEA的灵敏度为9.36,与Co3O4(室温下无响应,最佳工作温度173℃)相比,工作温度降低了148℃。Co3O4/PANI气体传感性能的提高源于两相耦合界面电荷转移特性的有效提升和氮的引入增加了氧空位浓度,为室温型气体传感器的开发提供了新的思路。
Polyaniline (PANI) is a π-bonded conjugated conducting polymer with unique electrochemical properties and its composite with p-type metal-oxide semiconductors (MOSs) can reduce the operating temperature of MOSs-based gas sensors and achieve low energy consumption of sensor devices.A two-step hydrothermal-in-situ polymerization method was used to construct Co3O4/PANI composite materials,and the detection of low concentration of triethylamine (TEA) at room temperature was achieved by the strategy of promoting the charge transfer at the complex-coupled interface and increasing the active sites.The results showed that the sensitivity of Co3O4/PANI with a molar ratio of Co3O4 to aniline monomer of 5∶6 for 100mg/L TEA at room temperature (25℃) was 9.36,and the operating temperature was reduced by 148℃ compared with that of Co3O4 (no response at room temperature and optimal operating temperature was 173℃).The improvement of gas sensing performance of Co3O4/PANI was originated from the coupling interface of the two phases.The effective enhancement of the charge transfer characteristics and the introduction of nitrogen increased the oxygen vacancy concentration,providing new ideas for the development of room-temperature gas sensors.
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基金资助
国家自然科学基金(22165001,52002088);广西自然科学基金面上项目(2025GXNSFAA069918)
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