Dinu Livia Alexandra, Buiculescu Valentin, Baracu Angela Mihaela
National Institute for Research and Development in Microtechnologies (IMT Bucharest), 077190 Voluntari, Romania.
Nanomaterials (Basel). 2022 Jun 20;12(12):2120. doi: 10.3390/nano12122120.
NO gas surface acoustic wave (SAW)sensors are under continuous development due to their high sensitivity, reliability, low cost and room temperature operation. Their integration ability with different receptor nanomaterials assures a boost in the performance of the sensors. Among the most exploited nano-materials for sensitive detection of NO gas molecules are carbon-based nanomaterials, metal oxide semiconductors, quantum dots, and conducting polymers. All these nanomaterials aim to create pores for NO gas adsorption or to enlarge the specific surface area with ultra-small nanoparticles that increase the active sites where NO gas molecules can diffuse. This review provides a general overview of NO gas SAW sensors, with a focus on the different sensors' configurations and their fabrication technology, on the nanomaterials used as sensitive NO layers and on the test methods for gas detection. The synthesis methods of sensing nanomaterials, their functionalization techniques, the mechanism of interaction between NO molecules and the sensing nanomaterials are presented and discussed.
由于具有高灵敏度、可靠性、低成本以及可在室温下运行的特点，一氧化氮（NO）气体表面声波（SAW）传感器一直在不断发展。它们与不同受体纳米材料的集成能力确保了传感器性能的提升。在用于灵敏检测NO气体分子的最常用纳米材料中，有碳基纳米材料、金属氧化物半导体、量子点和导电聚合物。所有这些纳米材料旨在为NO气体吸附创造孔隙，或用超小纳米颗粒扩大比表面积，从而增加NO气体分子可以扩散的活性位点。本综述对NO气体SAW传感器进行了总体概述，重点介绍了不同传感器的配置及其制造技术、用作敏感NO层的纳米材料以及气体检测的测试方法。文中介绍并讨论了传感纳米材料的合成方法、它们的功能化技术、NO分子与传感纳米材料之间的相互作用机制。
