School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, PR China.
J Colloid Interface Sci. 2021 Jul 15;594:690-701. doi: 10.1016/j.jcis.2021.03.041. Epub 2021 Mar 15.
Acetone sensors with high response and excellent selectivity are of enormous demand for monitoring the diabetes. This paper has reported a novel porous 3D hierarchical CoO/rGO nanocomposite synthesized by a microwave-assisted method, by which CoO nanoparticles are rapidly and uniformly anchored on rGO nanosheets. The phase composition, surface morphology of the CoO/rGO composites and the effect of rGO on their acetone-sensing performance were systematically investigated. The results show that the sample with an optimized content of rGO (CoO/rGO-1) achieves the highest stability and response to acetone (0.5 ~ 200 ppm) at a relatively low temperature (~160 °C). Also, the CoO/rGO-1 exhibits a high acetone-sensing selectivity against the gases (or vapors) of HS, H, CH, HCHO, CHOH, CHO and CHOH. The enhanced acetone-sensing performance of the CoO/rGO composite can be attributed to the CoO/rGO p-p heterojunction and the Co-C coupling effect between CoO and rGO, improving transport of carriers. In addition, the unique 3D hierarchically porous structure and large surface areas are favorable to adsorption and desorption of gas molecules. This facile microwave-assisted method provides a charming strategy to develop smart rGO-based nanomaterials for real-time detection of harmful gases and rapid medical diagnosis.
用于监测糖尿病的高响应和高选择性的丙酮传感器有巨大的需求。本文报道了一种通过微波辅助法制备的新型多孔 3D 分级 CoO/rGO 纳米复合材料，其中 CoO 纳米粒子快速且均匀地锚定在 rGO 纳米片上。系统研究了 CoO/rGO 复合材料的物相组成、表面形貌以及 rGO 对其丙酮传感性能的影响。结果表明，在 rGO 含量优化的样品（CoO/rGO-1）中，在相对较低的温度（160°C）下对 0.5200ppm 的丙酮表现出最高的稳定性和响应。此外，CoO/rGO-1 对 H2S、H2、CH4、HCHO、CH3OH、CHO 和 CH2OH 等气体（或蒸气）表现出高丙酮传感选择性。CoO/rGO 复合材料增强的丙酮传感性能归因于 CoO/rGO p-p 异质结以及 CoO 和 rGO 之间的 Co-C 偶联效应，这改善了载流子的传输。此外，独特的 3D 分级多孔结构和大的表面积有利于气体分子的吸附和解吸。这种简便的微波辅助方法为开发基于 rGO 的智能纳米材料以实时检测有害气体和快速医学诊断提供了一种有吸引力的策略。
