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表面电离气体检测中的灵敏度-选择性权衡

Sensitivity-Selectivity Trade-Offs in Surface Ionization Gas Detection.

作者信息

Müller Gerhard, Prades J Daniel, Hackner Angelika, Ponzoni Andrea, Comini Elisabetta, Sberveglieri Giorgio

机构信息

Department of Applied Sciences and Mechatronics, Munich University of Applied Sciences, D-80335 Munich, Germany.

MIND Group-Departament d'Engiyeria Electrònica i Biomèdica, Universitat de Barcelona, C Martí i Franquès, 108028 Barcelona, Spain.

出版信息

Nanomaterials (Basel). 2018 Dec 6;8(12):1017. doi: 10.3390/nano8121017.

DOI:10.3390/nano8121017
PMID:30563261
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6316693/
Abstract

Surface ionization (SI) provides a simple, sensitive, and selective method for the detection of high-proton affinity substances, such as organic decay products, medical and illicit drugs as well as a range of other hazardous materials. Tests on different kinds of SI sensors showed that the sensitivity and selectivity of such devices is not only dependent on the stoichiometry and nanomorphology of the emitter materials, but also on the shape of the electrode configurations that are used to read out the SI signals. Whereas, in parallel-plate capacitor devices, different kinds of emitter materials exhibit a high level of amine-selectivity, MEMS (micro-electro-mechanical-systems) and NEMS (nanowire) versions of SI sensors employing the same kinds of emitter materials provide significantly higher sensitivity, however, at the expense of a reduced chemical selectivity. In this paper, it is argued that such sensitivity-selectivity trade-offs arise from unselective physical ionization phenomena that occur in the high-field regions immediately adjacent to the surfaces of sharply curved MEMS (NEMS) emitter and collector electrodes.

摘要

表面电离（SI）为检测高质子亲和力物质提供了一种简单、灵敏且具有选择性的方法，这些物质包括有机衰变产物、医用和非法药物以及一系列其他有害物质。对不同类型的SI传感器进行的测试表明，此类设备的灵敏度和选择性不仅取决于发射体材料的化学计量和纳米形态，还取决于用于读取SI信号的电极配置的形状。然而，在平行板电容器设备中，不同类型的发射体材料表现出较高的胺选择性，而采用相同类型发射体材料的SI传感器的MEMS（微机电系统）和NEMS（纳米线）版本则提供了显著更高的灵敏度，不过，这是以化学选择性降低为代价的。本文认为，这种灵敏度与选择性之间的权衡源于紧邻尖锐弯曲的MEMS（NEMS）发射极和集电极表面的高场区域中发生的非选择性物理电离现象。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/096a/6316693/0e4e84588998/nanomaterials-08-01017-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/096a/6316693/929dfd986e55/nanomaterials-08-01017-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/096a/6316693/d12aa7a59d98/nanomaterials-08-01017-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/096a/6316693/6f1d5503dd32/nanomaterials-08-01017-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/096a/6316693/fbc62a712946/nanomaterials-08-01017-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/096a/6316693/e49b8c0504a7/nanomaterials-08-01017-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/096a/6316693/0e4e84588998/nanomaterials-08-01017-g015.jpg

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本文引用的文献

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Solid-State Gas Sensors: Sensor System Challenges in the Civil Security Domain.固态气体传感器：民用安全领域的传感器系统挑战
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