对氨基苯磺酸修饰MoO_(3)/PPy复合材料室温下对氨气的监测  

Monitoring Ammonia at Room Temperature of p-Aminobenzene Sulfonic Acid Modified MoO_(3)/PPy Composites

作　　者：丁宁宁 孙建华[1,2] 韦旭 孙丽霞[1,2] DING Ningning;SUN Jianhua;WEI Xu;SUN Lixia(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,Nanning 530004,China)

机构地区：[1]广西大学化学化工学院,南宁530004 [2]广西石化资源加工及过程强化技术重点实验室,南宁530004

出　　处：《无机材料学报》2024年第11期1245-1253,共9页Journal of Inorganic Materials

基　　金：国家自然科学基金(22165001,52002088);广西自然科学基金(2018GXNSFAA294001)。

摘　　要：氨气是一种有害的大气污染物,对人类健康和生态环境造成严重的危害,因此开发低能耗、高性能的氨气实时监测系统势在必行。本工作以MoO_(3)和吡咯单体(Py)为原料,FeCl_(3)为氧化剂,对氨基苯磺酸(pABSA)为阴离子表面活性剂,采用原位化学氧化聚合法制备了pABSA修饰的MoO_(3)/聚吡咯(PPy)复合材料。通过不同手段对材料的微观结构进行表征,探究了pABSA修饰对MoO_(3)/PPy复合材料气敏性能的影响。结果表明:pABSA-MoO_(3)/PPy复合材料在室温下对质量浓度1×10^(5)μg/L氨气的响应值为188%,为纯PPy(22%)的~8倍,并且表现出优异的选择性和稳定性。气敏性能提升归因于MoO_(3)与PPy之间形成的异质结以及pABSA的修饰使材料表面载流子增多。Ammonia is a harmful atmospheric pollutant that poses serious threats to human health and ecological environment.Therefore,the development of low-energy,high-performance and real-time ammonia monitoring system is imperative.In this study,p-aminobenzene sulfonic acid(pABSA)modified MoO_(3)/polypyrrole(PPy)composite materials were successfully prepared using an in situ chemical oxidation polymerization method with MoO_(3)and pyrrole monomer(Py)as raw materials and FeCl_(3)as an oxidant,along with pABSA as an anionic surfactant.Microstructure of the materials was characterized to explore influence of pABSA-modified MoO_(3)/PPy composite materials on the gas sensing performance.The results demonstrate that at room temperature,the response value of pABSA-modified MoO_(3)/PPy composite material to a mass concentration of 1×10^(5)μg/L ammonia is 188%,which is~8 times higher than that of pure PPy(22%),exhibiting excellent selectivity and stability.The enhancement in sensing performance can be attributed to the formation of a heterojunction between MoO_(3)and PPy as well as surface modification by pABSA leading to increased mobile charge carriers on the material's surface.

关 键 词：聚吡咯 MoO_(3) 对氨基苯磺酸 氨气 气敏性能 电荷传输 

分 类 号：TB332[一般工业技术—材料科学与工程]