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Flexible Room-Temperature NH 3 Sensor for Ultrasensitive, Selective, and Humidity-Independent Gas Detection.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2018 Aug 22; Vol. 10 (33), pp. 27858-27867. Date of Electronic Publication: 2018 Aug 08. - Publication Year :
- 2018
-
Abstract
- Ammonia (NH <subscript>3</subscript> ) is an irritant gas with a unique pungent odor; sub-parts per million-level breath ammonia is a medical biomarker for kidney disorders and Helicobacter pylori bacteria-induced stomach infections. The humidity varies in both ambient environment and exhaled breath, and thus humidity dependence of gas-sensing characteristics is a great obstacle for real-time applications. Herein, flexible, humidity-independent, and room-temperature ammonia sensors are fabricated by the thermal evaporation of CuBr on a polyimide substrate and subsequent coating of a nanoscale moisture-blocking CeO <subscript>2</subscript> overlayer by electron-beam evaporation. CuBr sensors coated with a 100 nm-thick CeO <subscript>2</subscript> overlayer exhibits an ultrahigh response (resistance ratio) of 68 toward 5 ppm ammonia with excellent gas selectivity, rapid response, reversibility, and humidity-independent sensing characteristics at room temperature. In addition, the sensing performance remains stable after repetitive bending and long-term operation. Moreover, the sensors exhibit significant response to the simulated exhaled breath of patients with H. pylori infection; the simulated breath contains 50 ppb NH <subscript>3</subscript> . The sensors thus show promising potential in detecting sub-parts per million-level NH <subscript>3</subscript> , regardless of humidity fluctuations, which can open up new applications in wearable devices for in situ medical diagnosis and indoor/outdoor environment monitoring.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 10
- Issue :
- 33
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 30051712
- Full Text :
- https://doi.org/10.1021/acsami.8b09169