期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 334, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129625
关键词
Exhaled breath analysis; Ammonia sensor; Humidity-activated; High selectivity
资金
- National Natural Science Foundation of China (NSFC) [61903150, 61773178]
- Projects of Science and Technology Development Plan of Jilin Province [20200801037GH]
- China Postdoctoral Science Foundation [2019M650059]
The high concentration of ammonia in exhaled breath can be a biomarker for end-stage renal disease, but detecting it using gas sensors is challenging due to the complex components and high humidity of the gases. A new NH3 sensing design using a humidity-activated mechanism at room temperature was developed, with promising results for highly selective detection of NH3 under high humidity conditions. The environmentally friendly biomass hydrogel sensor showed a strong response to 50 ppm NH3 at 80% relative humidity, suggesting its potential for analyzing exhaled breath.
High ammonia (NH3) concentration in the exhaled breath can be used as a crucial biomarker for end-stage of renal disease. Detecting exhaled ammonia via gas sensors remains a huge challenge, because of the complex components and high humidity environment of exhaled gases. Herein, a creative design for NH3 sensing is realized using a humidity-activated mechanism at room temperature. The investigation reveals that the carboxylate formation reaction specific recognition of NH3 can be activated under high humid environment. An environmentally friendly and non-toxic biomass hydrogel NH3 sensor was developed, with poly-L-aspartic acid (PAA) and L-glutamic acid (GA) as the sensing material. The response to 50 ppm NH3 can reach 9.2 under 80 % RH at room temperature. The humidity-activated sensing mechanism is proposed as a complex process involving the acid-base adsorption, the formation of ionic conduction and the reaction between carboxylic acid groups and NH3. It is believed that the PAA/GA sensor presents a new pathway for highly selective detection of NH3 under high humidity condition, which is a promising method for analyzing the exhaled ammonia.
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