Highly selective oxidizing gas sensors are of great importance for environmental pollution monitoring. In this work, a hybrid material containing Zn₂SnO₄ nanoparticles (NPs) and immobilized reduced graphene oxide (Zn₂SnO₄-RGO) was developed as a high performance gas sensing material for the detection of ppb-levels of oxidizing gases (NO₂ and O₃). The structural, morphological and compositional properties of the Zn₂SnO₄-RGO hybrids were systematically characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), which demonstrated the successful anchoring of Zn₂SnO₄ NPs on RGO nanosheets. The obtained Zn₂SnO₄-RGO hybrids exhibited outstanding sensing performance for detecting oxidizing gases (NO₂ and O₃) with very low cross sensitivities to reducing gases, such as C₂H₅OH, CH₃COCH₃ and CO. The Zn₂SnO₄-RGO based sensors exhibited high response values of up to 3.50 for 500 ppb NO₂, which is higher than that for detection of 500 ppb O₃ (1.78) at 30 °C under 50% relative humidity (RH). Moreover, the NO₂ sensing performances of Zn₂SnO₄-RGO-based sensors were investigated under various RH. In all cases, the sensors based on RGO and Zn₂SnO₄-RGO hybrids presented p-type behavior. The sensors based on Zn₂SnO₄-RGO hybrids also exhibited high response values of up to 3.62 for 1 ppm NO₂ at 50 °C in 80% RH, which is much higher than that of pure RGO (1.31). The excellent sensing performances are mainly ascribed to the synergetic effect of Zn₂SnO₄ NPs and RGO. Furthermore, the surface reaction between Zn₂SnO₄-RGO hybrids and NO₂ can be concluded from Operando diffuse reflectance infrared Fourier transformed spectroscopy (Operando DRIFT).

高度选择性的氧化气体传感器对于环境污染监测非常重要。在这项工作中，开发了一种包含Zn ₂ SnO ₄纳米颗粒（NPs）和固定化还原氧化石墨烯（Zn ₂ SnO ₄ -RGO）的杂化材料，作为一种高性能的气体传感材料，用于检测ppb级的氧化性气体（NO ₂和O ₃）。通过X射线衍射（XRD），透射电子显微镜（TEM）和X射线光电子能谱（XPS）对Zn ₂ SnO ₄ -RGO杂化物的结构，形态和组成特性进行了系统表征。锌RGO纳米片上的_2个SnO ₄ NP。所得的Zn ₂ SnO ₄ -RGO杂化物表现出出色的感测性能，可检测对还原性气体（如C ₂ H ₅ OH，CH ₃ COCH ₃和CO ）具有极低交叉敏感性的氧化性气体（NO ₂和O ₃）。_2个基于SnO ₄ -RGO的传感器对500 ppb NO ₂表现出高达3.50的高响应值，高于在30％的温度和50％相对湿度（RH）下检测500 ppb O ₃（1.78）的响应值。而且，NO ₂在不同的相对湿度下研究了基于Zn ₂ SnO ₄ -RGO的传感器的传感性能。在所有情况下，基于RGO和Zn ₂ SnO ₄ -RGO杂化物的传感器均表现出p型行为。基于Zn ₂ SnO ₄ -RGO杂化物的传感器在50％的温度和80％相对湿度下对1 ppm NO ₂表现出高达3.62的高响应值，远高于纯RGO的响应值（1.31）。优异的感测性能主要归因于Zn ₂ SnO ₄ NPs与RGO的协同作用。此外，Zn ₂ SnO ₄ -RGO杂化物与NO ₂之间的表面反应 可以从Operando漫反射红外傅里叶变换光谱（Operando DRIFT）中得出结论。