Soft template-mediated coupling construction of sandwiched mesoporous PPy/Ag nanoplates for rapid and selective NH3 sensing
Soft template-mediated coupling construction of sandwiched mesoporous PPy/Ag nanoplates for rapid and selective NH3 sensing
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DOI：
10.1039/d1ta01110c
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发表时间：
2021-03
影响因子：
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通讯作者：
Facai Wei;Yonghui Zhong;Hao Luo;Yong Wu;Jianwei Fu;Qingguo He;Jiangong Cheng;Jongbeom Na
中科院分区：
文献类型：
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作者：
Facai Wei;Yonghui Zhong;Hao Luo;Yong Wu;Jianwei Fu;Qingguo He;Jiangong Cheng;Jongbeom Na
在一个合成系统中将异质材料从不同的分子单元同步构建成功能性杂化物，具有定制性质和应用的巨大潜力，但这需要个体生长、组装、它们的相互作用甚至动态行为的精心协调，因此仍然是一个巨大的挑战。在这里，我们开发了一个简单的软模板介导的耦合建设的方法来实现一个未开发的三明治介孔聚吡咯（PPy）纳米涂层/单晶银纳米片杂化通过一步无机/有机氧化还原反应在液体界面。吡咯的化学氧化聚合伴随着Ag+的还原，两亲性模板剂通过氢键和螯合作用限制了单晶Ag纳米片的生长，同时引导介孔PPy纳米涂层的形成，形成了一种新型的具有可调节介孔的三明治结构纳米杂化物（20~40 nm），厚度可变（150~300 nm），具有较强的近红外吸收和拉曼增强效应。作为平面结构气体传感器中的化学电阻材料，它提供了较短的响应时间（7 s）和恢复时间（21 s）比以前报道的传感器和显着的传感响应灵敏度NH3（11.6%，1 ppm）。这些结果是由于具有暴露的活性位点和强耦合效应的独特纳米结构。
Synchronous construction of heterogeneous materials from distinct molecular units into functional hybrids within one synthesis system holds large potential for customizing properties and applications, but which requires the elaborate coordination of individual growth, assemblies, their interactions and even dynamic behaviors, thus still remains an enormous challenge. Here we develop a simple soft template-mediated coupling construction approach to achieve an unexplored sandwiched mesoporous polypyrrole (PPy) nanocoating/single-crystal Ag nanoplate hybrid by a one-step inorganic/organic redox reaction at the liquid interface. The chemically oxidative polymerization of pyrrole accompanies the reduction of Ag+ at room temperature, and the amphiphilic template confines the growth of the single-crystal Ag nanoplate and synchronously guides the formation of the mesoporous PPy nanocoating by hydrogen bond and chelation interaction, emerging into a novel sandwiched nanohybrid with adjustable mesopores (20~40 nm), changeable thickness (150~300 nm), strong near-infrared absorption and Raman enhancement effect. As a chemiresistive material in a planar-configuration gas sensor, it delivers a shorter response (7 s) and recovery time (21 s) than those for previously reported sensors and remarkable sensing response sensitivity to NH3 (11.6% for 1 ppm). These results are due to the unique nanoarchitecture with exposed active sites and strong coupling effects.