Microwave-Assisted Hydrothermal/Impregnation Synthesis of Cu2O-Decorated rGO/In2O3 Nanorices for Sensitive SO2 Gas Sensors
Source abstract
Abstract
In the present development, Cu 2 O-decorated reduced graphene oxide/indium oxide (rGO/In 2 O 3 ) nanorices with Cu contents of 0–1.5 wt % were synthesized by a microwave-assisted hydrothermal method combined with impregnation and studied for gas-sensing applications toward SO 2 . The material characterization results revealed that 3–5 nm Cu 2 O secondary nanoparticles were uniformly decorated on porous In 2 O 3 nanorices mixed with rGO sheets. Based on systematic gas-sensing measurements, Cu 2 O decoration on rGO/In 2 O 3 nanorices with the optimal Cu content of 1.0 wt % provided a considerably improved SO 2 response of 11.1 to 5 ppm SO 2, which was approximately 3.3-fold as high as that of pristine rGO/In 2 O 3 nanorices (3.4) at an optimal temperature of 200 °C. Additionally, high SO 2 selectivity was attained against NO 2, NO, CO, H 2 S, C 2 H 5 OH, C 2 H 4, H 2, and NH 3 . Moreover, the Cu 2 O-rGO/In 2 O 3 sensors displayed low humidity sensitivity, good repeatability, and satisfactory long-term stability. Therefore, Cu 2 O-decorated rGO/In 2 O 3 nanorices represented one of the most promising SO 2 sensors for environmental and practical applications.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · ZnO doping and properties · Analytical Chemistry and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Applied Chemistry Program, Faculty of Science, Maejo University, Chiang Mai 50290, Thailand
National Security and Dual-Use Technology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani 12120, Thailand
Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand
Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Nanoscience and Nanotechnology Program, Faculty of Science, Maejo University, Chiang Mai 50290, Thailand
Funding
Thailand Science Research and Innovation · Thailand Graduate Institute of Science and Technology · Thailand Research Fund
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