PeiJiang Cao , YongZhi Cai , Dnyandeo Pawar , S.T. Navale , Ch.N. Rao , Shun Han , WangYin Xu , Ming Fang , XinKe Liu , YuXiang Zeng , WenJun Liu , DeLiang Zhu , YouMing Lu
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引用次数: 75
Abstract
In this work, we report parts per billion (ppb) NO2 gas detection by utilizing zinc oxide/reduced graphene oxide (ZnO/rGO) heterostructure through a chemiresistive approach. The sensing material is carefully investigated through numerous characterization techniques. The experimental results indicated that the designed sensor shown good linearity in low ppb range of nitrogen dioxide (NO2) gas. The sensor exhibited very high response of 33.11 at 2.5 ppm in 182 s with obtained detection limit down to ppb at relatively low optimal operating temperature of 110 °C. The remarkable performance of ZnO/rGO heterostructure towards NO2 and negligible cross-response to other interfering gases along with high repeatability and long-term stability of the sensor is investigated. Due to many reactive sites and high transport capability of rGO along with high gas adsorption of ZnO nanospheres which attributes to the favorable charge transfer at ZnO/rGO interface under exposure of NO2 gas which leads to modulate the energy band structure. This study shows that the simple, cost-effective synthesis method along with easy-fabricated and deployable sensor can be applied in many industrial and environmental applications.
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.