Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 24, Pages 13333-13339Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am404195u
Keywords
SnO2; nanoparticles; graphene; humidity sensor; reducing; environmentally friendly green method
Funding
- National Science Foundation of China [21074089, 21276181]
- Tianjin Municipal Science and Technology Commission, People's Republic of China [09JCZDJC23300]
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A facile approach to prepare SnO2/rGO (reduced graphene oxide) hybrid nanoparticles by a direct redox reaction between graphene oxide (GO) and tin powder was developed. Since no acid was used, it is an environmentally friendly green method. The SnO2/rGO hybrid nanoparticles were characterized by ultraviolet-visible spectroscopy, Raman spectroscopy, thermogravimetric analysis, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The microstructure of the SnO2/rGO was observed with scanning electron microscopy and transmission electron microscopy. The tin powder, efficiently reduced GO to rGO, and the Sn was transformed to SnO2 nanoparticles (similar to 45 nm) that were evenly distributed on the rGO sheets. The SnO2/rGO hybrid nanoparticles were then coated on an interdigital electrode to fabricate a humidity sensor, which have an especially good linear impedance response from 11% to 85% relative humidity.
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