AbstractA nanocomposite consisting of a few layers of graphene (FLG) and tin dioxide (SnO2) was prepared by ultrasound-assisted synthesis. The uniform SnO2 nanoparticles (NPs) on the FLG were characterized by X-ray diffraction in terms of lattice and phase structure. The functional groups present in the composite were analyzed by FTIR. Electron microscopy (HR-TEM and FE-SEM) was used to study the morphology. The effect of the fraction of FLG present in the nanocomposite was investigated. Sensitivity, selectivity and reproducibility towards resistive sensing of liquid propane gas (LPG) was characterized by the I-V method. The sensor with 1% of FLG on SnO2 operated at a typical voltage of 1 V performs best in giving a rapid and sensitive response even at 27 °C. This proves that the operating temperature of such sensors can be drastically decreased which is in contrast to conventional metal oxide LPG sensors. Graphical abstractSchematic of a room temperature gas sensor for liquefied petroleum gas (LPG). It is based on the use of a few-layered graphene (1 wt%)/SnO2 nanocomposite that was deposited on an interdigitated electrode (IDEs). A sensing mechanism for LPG detection has been established.

中文翻译：

---

基于使用几层石墨烯/SnO2 纳米复合材料的室温 LPG 电阻传感器

摘要 通过超声辅助合成制备了由几层石墨烯 (FLG) 和二氧化锡 (SnO2) 组成的纳米复合材料。FLG 上均匀的 SnO2 纳米粒子 (NPs) 通过 X 射线衍射在晶格和相结构方面进行表征。复合材料中存在的官能团通过 FTIR 进行分析。电子显微镜（HR-TEM 和 FE-SEM）用于研究形态。研究了存在于纳米复合材料中的 FLG 分数的影响。对液态丙烷气 (LPG) 的电阻传感的灵敏度、选择性和再现性通过 IV 方法进行表征。即使在 27 °C 下，在 1 V 的典型电压下运行的 SnO2 上具有 1% FLG 的传感器也能提供最佳的快速灵敏响应。这证明与传统的金属氧化物液化石油气传感器相比，此类传感器的工作温度可以大幅降低。用于液化石油气 (LPG) 的室温气体传感器的图形摘要示意图。它基于使用沉积在叉指电极 (IDE) 上的几层石墨烯 (1 wt%)/SnO2 纳米复合材料。建立了液化石油气检测的传感机制。