Detection of nitrous oxide using infrared optical plasmonics coupled with carbon nanotubes
Detection of nitrous oxide using infrared optical plasmonics coupled with carbon nanotubes
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DOI：
10.1039/d0na00525h
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发表时间：
2020-10-01
影响因子：
4.7
通讯作者：
Rozhin, Alex
中科院分区：
文献类型：
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作者：
Allsop, Thomas;Al Araimi, Mohammed;Rozhin, Alex
使用功能化碳纳米管进行气体传感的兴趣是一个主要的研究领域，该领域利用与特定气体反应引起的电特性变化。本文描述了特定的气体传感的光学平台上的2维纳米结构的等离子体阵列的纳米天线/纳米线，与拓扑尺寸的平均半径为130 nm，典型的长度为20 μ m和周期为500 nm。该阵列是由空间压缩的锗氧化物，当材料与紫外线照射相互作用时，它可以支持红外局部表面等离子体。将碳纳米管沉积在等离子体平台的表面上，然后施加聚乙烯亚胺聚合物。由此产生的纳米材料-光子平台产生了对一氧化二氮气体的选择性反应，这是大气退化的主要原因。我们实现了设备的灵敏度高达100%的一氧化二氮的检测限为109 ppm，最大响应时间为19秒，并产生+5.7 nm的满量程偏转。这项工作表明，特定碳纳米管的光学特性可以用于广泛的传感应用，提供了一个新的传感范例。
Interest in gas sensing using functionalised carbon nanotubes is a major area of research that utilises changes in their electrical properties induced by the reaction with a specific gas. This paper describes specific gas sensing on an optical platform consisting of a 2-dimensional nano-structured plasmonic array of nano-antennae/nanowires, with topological dimensions of mean radius of 130 nm, typical length of 20 mu m and a period of 500 nm. The array is created by the spatial compaction of germanium oxides when the material interacts with ultra-violet irradiance, it can support infra-red localised surface plasmons. Carbon nanotubes are deposited upon the surface of the plasmonic platform followed by the application of the polyethyleneimine polymer. The resulting nanomaterials-photonic platform gives rise to the selective response to nitrous oxide gases, which are a major contributor to atmospheric degradation. We achieve the device sensitivity up to 100% atmosphere of nitrous oxide with a detection limit of 109 ppm, a maxiumum response time of nineteen seconds and yielding a full-scale deflection of +5.7 nm. This work demonstrates that the optical properties of specific carbon nanotubes can be used in a wide range of sensing applications offering a new sensing paradigm.