Low temperature gas sensors for monitoring low ppm volatile organic compounds (VOCs) in indoor climate have critical advantages in designing portable sensing devices. Herein, a highly sensitive as well as fast response In(III)-SnO₂ loaded cubic mesoporous mpg-CN (commonly known as g-C₃N₄) based toluene gas sensor has been fabricated through template inversion of KIT-6. When exposed to a variety of test VOCs at 200 °C, the In(III)-SnO₂/mpg-CN (1% In) showed a highly selective response (R_a/R_g = 61.4) and fast reversible response/recovery (4/2 s) to 50 ppm toluene gas. The sensor was also able to selectively detect 50 ppm (R = 2.4) and 100 ppm (R = 3.6) toluene gas at 90 °C. Compared to mesoporous In(III)-SnO₂, the mpg-CN supported In(III)-SnO₂ nanocomposite shows ∼2 fold increase in response to toluene gas while reducing the optimized operating temperature by 50 °C. The significant enhancement in sensitivity and lowering down of optimized operating temperature is attributed to the higher surface area, easily accessible mesopore channels of 3D mesoporous cubic structure and suitable heterojunction formation by the semiconducting In(III)-SnO₂/mpg-CN nanocomposite. The findings reported in this study shows promising glimpse for designing a novel strategy to the development of ultrasensitive VOCs sensors working at low operating temperature.

在设计便携式传感设备时，用于监视室内气候中的低ppm挥发性有机化合物（VOC）的低温气体传感器具有关键优势。在此，通过对KIT-6进行模板反转，制备了高灵敏度且响应迅速的负载In（III）-SnO _2的立方介孔mpg-CN（俗称gC ₃ N ₄）基甲苯气体传感器。当在200°C下暴露于各种测试VOC时，In（III）-SnO ₂ / mpg-CN（1％In）表现出高度选择性的响应（R _a / R _g = 61.4）和对50 ppm甲苯气体的快速可逆响应/恢复（4/2 s）。该传感器还能够在90°C下选择性检测50 ppm（R = 2.4）和100 ppm（R = 3.6）甲苯气体。与中孔In（III）-SnO _2相比，由mpg-CN负载的In（III）-SnO ₂纳米复合材料响应甲苯气体显示出约2倍的增加，同时将最佳工作温度降低了50°C。灵敏度的显着提高和优化工作温度的降低归因于更高的表面积，3D介孔立方结构的易于接近的中孔通道以及半导体In（III）-SnO ₂形成的合适的异质结/ mpg-CN纳米复合材料。这项研究报告的发现表明，为开发一种在低工作温度下工作的超灵敏VOCs传感器的开发新策略，有希望的一瞥。