Journal
ACS APPLIED NANO MATERIALS
Volume 2, Issue 5, Pages 2734-2742Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b00257
Keywords
ZnO; RGO; g-C3N4; nanocomposite; gas sensor; ethanol
Funding
- National Natural Science Foundation of China [61833006, 61673367, 61504023]
- Fundamental Research Funds for the Central Universities in China [N180408018, N170405001, N180102032, N170407005]
- Liaoning Province Natural Science Foundation [20180550483, 20170540324]
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In this work, we reported a ternary sensing material using graphitic carbon nitride (g-C3N4) nanosheets as sensitization modifier for zinc oxide (ZnO)/reduced graphene oxide (rGO) rather than widely reported noble metal nanoparticles. The nanostructures of 2D graphene oxide (GO)-hybridized by g-C3N4 were synthesized in advance by combining ultrasonic dispersion and electrostatic self-assembly strategy. ZnO nanoparticles were coated on GO/g-C3N4 through a hydrothermal process, in which GO was totally reduced to rGO. Compared with pure ZnO and ZnO/rGO, the ZnO/rGO/g-C3N4 nanocomposites exhibited a remarkable enhancement in the responses to ethanol vapor. The ternary nanocomposites showed the highest response of 178 (R-a/R-g) to 100 ppm ethanol at 300 degrees C with a detect limitation lower than 500 ppb, which was about 2-fold and 9-fold higher than ZnO/rGO and pure ZnO samples, respectively. The enhancement was attributed to the sensitization of g-C3N4 and the ample interfacial contact between rGO and g-C3N4. The ethanol sensing mechanism associated with ZnO nanoparticles and GO/g-C3N4 2D hybrid structure was also discussed in detail.
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