One-Step Hydrothermal Synthesis of 3D Interconnected rGO/In2O3 Heterojunction Structures for Enhanced Acetone Detection

Acetone detection is of great significance for environmental monitoring or diagnosis diabetes. Nevertheless, fast and sensitive acetone at low temperatures remains challenging. Herein, a series rGO-functionalized three-dimensional (3D) In2O3 flower-like structures were designed synthesized via facile hydrothermal method, their acetone-sensing properties systematically investigated. Compared to the pure 3D structures, demonstrated greatly improved performance relatively temperatures. In particular, 5-rGO/In2O3 sensor with an optimized decoration exhibited highest response value (5.6) 10 ppm 150 °C, which was about 2.3 times higher than that (2.4 200 °C). Furthermore, also showed good reproducibility, sub-ppm-level limit (1.3 0.5 ppm), recovery rates (3 s 18 s, respectively), long-term stability. The extraordinary rGO/In2O3 composites can be attributed synergistic effect formation p-n heterojunctions between rGO In2O3, large specific surface area, unique high conductivity rGO. This work provides novel sensing material design strategy effective acetone.