Journal
NANOMATERIALS
Volume 12, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/nano12122120
Keywords
nanomaterials for NO2 detection; gas sensors; SAW devices
Categories
Funding
- Ministry of Research, Innovation and Digitization, CNCS-UEFISCDI [PN-III-P1-1.1-PD-2021-0495, PN-III-P2-2.1-PED-2019-0703, PFE541]
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This review provides an overview of the development and application of NO2 gas surface acoustic wave (SAW) sensors, focusing on different sensor configurations, fabrication technology, sensitive layer nanomaterials, and gas detection test methods. The synthesis methods of nanomaterials, their functionalization techniques, and the mechanism of interaction between NO2 molecules and the sensing nanomaterials are discussed.
NO2 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 NO2 gas molecules are carbon-based nanomaterials, metal oxide semiconductors, quantum dots, and conducting polymers. All these nanomaterials aim to create pores for NO2 gas adsorption or to enlarge the specific surface area with ultra-small nanoparticles that increase the active sites where NO2 gas molecules can diffuse. This review provides a general overview of NO2 gas SAW sensors, with a focus on the different sensors' configurations and their fabrication technology, on the nanomaterials used as sensitive NO2 layers and on the test methods for gas detection. The synthesis methods of sensing nanomaterials, their functionalization techniques, the mechanism of interaction between NO2 molecules and the sensing nanomaterials are presented and discussed.
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