In2O3 Nanoparticles DecoratedZnO Hierarchical Structures for n‑ButanolSensor
2020
In2O3 nanoparticles decorated ZnO hierarchical
structures with excellent n-butanol-sensing performance
were successfully fabricated by the one-pot sol–gel method.
The formation process of the unique In2O3–ZnO
hierarchical structure was investigated through experiments. The addition
of indium was a crucial factor for the morphology and structure of
the final product. The influence of the addition of indium on the
sensor properties of the In2O3–ZnO hierarchical
structure was examined systematically. The optimum indium–zinc
ratio was 1:3. Sensor responses of the In2O3–ZnO (1:3) heterostructures toward 10 and 100 ppm n-butanol reached 18 and 218.3 at 260 °C. The response–recovery
times toward 10 ppm n-butanol were 1 and 5 s. The
gas-sensing mechanism was investigated based on the X-ray photoelectronic
spectroscopy, photoluminescence spectroscopy, electron paramagnetic
resonance spectroscopy, and UV–vis diffuser reflectance spectroscopy
analyses. The improved gas-sensing performance of In2O3–ZnO was ascribed mainly to the unique microstructure
and the surface decoration by In2O3 nanoparticles.
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