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- Title
High-sensitivity NH<sub>3</sub> gas sensor using pristine graphene doped with CuO nanoparticles.
- Authors
Tsymbalenko, Oleksandr; Lee, Soyoung; Lee, Yong-Min; Nam, Yun-Sik; Kim, Byoung Chan; Kim, Jin Young; Lee, Kang-Bong
- Abstract
A highly sensitive and selective NH3 gas sensor was developed based on single-layer pristine graphene doped with copper(II) oxide (CuO) nanoparticles of a specific size. High-quality single-layer graphene was grown using chemical vapor deposition. Approximately 15 nm-sized CuO colloidal nanoparticles were fabricated by a microwave-assisted thermal method using copper acetate as the precursor, and dimethylformamide as the reducing and stabilizing agent. Pristine graphene was doped with an aqueous suspension of CuO nanoparticles at a coating speed of 1500 rpm using a simple spin coater. CuO nanoparticle doping induces changes in the electronic properties of graphene; in particular, p-type doping significantly altered graphene resistivity in the presence of NH3 gas. Upon exposure of the pristine graphene surface to NH3 gas, NH3 reacted with O2−/ O−/ O2− species on the graphene surface and released electrons into graphene. This caused a change in the concentration of charge carriers in the valence channel of graphene and an increase in graphene resistivity, facilitating real-time NH3 monitoring with quick response and rapid recovery at 25 ℃ and ~ 55% relative humidity. Our results indicated that graphene doped with ~ 15 nm-sized CuO nanoparticles can sense NH3 gas selectively with a resistivity response of ~ 83%. Moreover, the sensor exhibited good reusability, fast response (~ 19 s), and rapid recovery (~ 277 s) with a detection limit of 0.041 ppm and a relative standard deviation of 0.76%.
- Subjects
GAS detectors; SURFACE plasmon resonance; GRAPHENE; COPPER oxide; CHARGE carriers; CHEMICAL vapor deposition; NANOPARTICLES
- Publication
Microchimica Acta, 2023, Vol 190, Issue 4, p1
- ISSN
0026-3672
- Publication type
Article
- DOI
10.1007/s00604-023-05717-y