WO_(3)@PANI复合材料的制备及其pH传感性能

Preparation of WO_(3)@PANI Composites and Their pH Sensing Properties

目的通过简单快捷的方法制备氧化钨(WO_(3))/聚苯胺(PANI)复合材料,获得高性能pH传感器。方法WO_(3)和PANI都是通过原位聚合法制备,在溶液中混合后旋涂在柔性碳基底上。通过扫描电子显微镜、拉曼光谱、XRD等技术对复合材料进行表征,证明复合材料的成功合成并进一步解释其传感增强原理。结果WO_(3)@PANI可以在pH=2~10内工作,与单体材料相比具有较高的灵敏度(-53.13 mV),较低的滞后度(3.8%)和较快的反应速度(16 s),在10次酸碱循环测试后响应性保持在95%以上,且在12 h的连续测试中可以保持稳定。结论一方面PANI为WO_(3)提供了导电网络,并将WO_(3)均匀包裹在内;另一方面两者的p-n结构共同作用,使得WO_(3)@PANI的pH传感性能进一步提高。

The work aims to demonstrate a high-performance pH sensor based on tungsten oxide(WO_(3))/polyaniline(PANI)composites.Both WO_(3) and PANI were prepared by in-situ polymerization,mixed in solution and spin-coated onto a flexible carbon substrate.The composite was characterized by scanning electron microscopy,Raman spectroscopy,XRD and other techniques to prove the successful synthesis of the composite and further explain its sensing enhancement principle.WO_(3)@PANI could work at pH=2~10,with higher sensitivity(–53.13 mV),lower lag(3.8%)and faster reaction(16 s)compared with the monomeric material.The response remained above 95%after 10 acid-base cycle tests and remained stable during 12 h of continuous testing.On the one hand,PANI provides a conductive network for WO_(3),and evenly wraps WO_(3) in it;and on the other hand,the p-n structures of them work together to further improve the pH sensing performance of WO_(3)@PANI.