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首页> 外文期刊>ACS applied materials & interfaces >Impact Ionization Induced by Accelerated Photoelectrons for Wide-Range and Highly Sensitive Detection of Volatile Organic Compounds at Room Temperature
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Impact Ionization Induced by Accelerated Photoelectrons for Wide-Range and Highly Sensitive Detection of Volatile Organic Compounds at Room Temperature

机译：加速光电子诱导的冲击电离，用于室温下挥发性有机化合物的宽范围和高敏感性检测

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摘要

Ionization-based volatile organic compound (VOC) sensors that use photons or electrons operating at room temperature have attracted considerable attention as a promising alternative to conventional metal oxide-based sensors that require high temperature for sensing function. However, the photoionization sensors cannot ionize many gas species for their limited photon energy, and field emission-based ionization sensors that rely on the breakdown voltage of specific gas species in a pure state may not tell different concentration. This work demonstrates the detection of VOCs using impact ionization induced by accelerated photoelectrons. Although the photoelectrons emitted by relatively low photon energy typically have insufficient kinetic energy to cause impact ionization, in this approach, they are accelerated between microgap electrodes to enhance their kinetic energy such that the impact ionization of VOCs can be achieved. The demonstrated gas sensor sensitively detects toluene concentration in a wide range from 1000 ppm to 100 ppb with fast response and recovery time at room temperature. Additionally, diverse VOC species including benzene, p-xylene, and even acetylene with high ionization energy can be detected. The proposed method could be a viable solution for VOC sensors with low cost, scalable producibility, and high performance.
机译：在室温下使用光子或电子操作的基于电离的挥发性有机化合物（VOC）传感器吸引了可观的关注，作为需要高温的传统金属氧化物的传感器的有希望的替代品，该传感器是对传感功能的高温。然而，光离子激素传感器不能为它们的有限光子能量电离，以及依赖于纯净状态下特定气体物种的击穿电压的场发射电离传感器可能无法指出不同的浓度。这项工作证明了使用加速光电子诱导的抗冲电离的VOC检测。尽管通过相对低的光子能量发出的光电子通常具有不足的动能，以引起抗冲电离，但在这种方法中，它们在微胶像电极之间加速，以增强它们的动能，使得可以实现VOC的冲击电离。所示的气体传感器在室温下快速响应和恢复时间敏感地检测甲苯浓度在1000ppm至100ppb的宽范围内。另外，可以检测包括具有高电离能量的苯，对二甲苯，甚至乙炔的不同VOC物种。该方法可以是具有低成本，可扩展性生产性和高性能的VOC传感器的可行解决方案。

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