Porous SnO2 nanospheres coated with reduced graphene oxide for formaldehyde gas sensor: Synthesis, performance and mechanism
Source abstract
Abstract
Mesoporous SnO2nanospheres are synthesized by template-free solvothermal method, and then reduced graphene oxide (rGO) nanosheets are anchored on SnO2nanospheres (SnO2@rGO nanocomposites) by hydrothermal method. The gas-sensing results indicate that rGO nanosheets greatly affect the formaldehyde (HCHO) gas-sensing properties, which the response to 100 ppm HCHO gas increases with the rGO content and reach the maximum of 113.56 at 190 °C for SnO2@0.5%rGO sensor. Owing to the huge surface area and conductivity, rGO nanosheets absorb more oxygen molecules and extract electrons from SnO2nanospheres, leading to the thicker electron depletion layer of SnO2nanospheres. Furthermore, p-n heterojunctions at the interface of rGO nanosheets and SnO2nanospheres further increase the thickness of electron depletion layer. However, SnO2@0.8%rGO sensor presents the lower response for the new conductive pathways between the surface rGO nanosheets due to the excess of rGO content.Graphical abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Advanced Chemical Sensor Technologies · Analytical Chemistry and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (100+)
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