Flexible fabric gas sensors based on PANI/WO3 p−n heterojunction for high performance NH3 detection at room temperature

A PANI/WO3@cotton thread-based flexible sensor that is capable of detecting NH3 at room temperature is developed here.A layer of WO3 with PANI nanoparticles can be deposited by in-situ polymerization.The morphology and structure of the specimens were investigated by utilizing TEM,SEM,XRD and FTIR.The sensing performance of the PANI/WO3@cotton sensors with different WO3 molar ratios to NH3 at room temperature was examined.The results show that the optimal sensor(10 mol%WO3)has a response of 6.0 to 100 ppm NH3,which is significantly higher than that of the sensors based on pristine PANI and other composites.The PANI/WO3@cotton sensor also displays excellent selectivity,gas response,and flexibility even at room temperature.The unique fiber structure,p-n heterojunction,and the increased protonation of PANI in the composites contribute to the enhanced sensing property.

GO/WO_3/PANI复合材料的制备及其电化学性能研究

以钨酸钠、石墨和苯胺为主要原料,采用水热合成法和原位聚合法制备GO/WO_3/PANI三元复合材料,对其电化学性能进行测试.结果表明:三元材料的复合可以提高材料的综合电化学性能,在20 m V/s的扫描速率下、纳米WO_3的添加量为0. 42 g时,三元复合材料样品GWP-4的电化学性能最好;随着充放电电流的增大,该样品的放电时间缩短,比电容减小,在充放电电流为0. 2 A/g时,其比电容最大,为107 F/g.

聚苯胺/三氧化钨复合薄膜的制备与性质

采用溶胶-凝胶法在氧化铟锡(ITO)玻璃上制备三氧化钨(WO_3)薄膜,将其在300℃下焙烧2h,再通过电沉积法在表面生长聚苯胺(PANI)薄膜。采用电化学方法、光谱分析法及扫描电镜等测试手段对WO_3薄膜、PANI薄膜及PANI/WO_3复合膜进行表征,发现复合膜着色态与褪色态透过率差异显著,变色效率(CE)达到57.94cm^2/C,比PANI和WO_3薄膜的CE值28.94和10.55cm^2/C分别提高了50%和82%。扫描电镜结果表明,PANI薄膜表面结构疏松,有无序的微孔;而复合膜的结构规整、微孔排列相对有序且表面形貌均匀。