SnO-SnO2 modified two-dimensional MXene Ti3C2Tx for acetone gas sensor working at room temperature
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第14期
论文作者：Zijing Wang Fen Wang Angga Hermawan Yusuke Asakura Takuya Hasegawa Hiromu Kumagai Hideki Kato Masato Kakihana Jianfeng Zhu Shu Yin
摘 要：Acetone,as widely used reagents in industry and laboratories,are extremely harmful to the human.So the detection of acetone gas concentrations and leaks in special environments at room temperature is essential.Herein,the nanocomposite combining SnO-SnO2（p-n junction） and Ti3C2Tx MXene was successfully synthesized by a one-step hydrothermal method.Because of the existence of a small amount of oxygen during the hydrothermal conditions,part of the p-type Sn O was oxidized to n-type SnO2,forming in-situ p-n junctions on the surface of Sn O.The hamburger-like SnO-SnO2/Ti3C2Tx sensor exhibited improved acetone gas sensing response of 12.1 （Rg/Ra） at room temperature,which were nearly 11 and 4 times higher than those of pristine Ti3C2Tx and pristine Sn O-Sn O2,respectively.Moreover,it expressed a short recovery time （9 s） and outstanding reproducibility.Because of the different work functions,the Schottky barrier was formed between the Sn O and the Ti3C2Tx nanosheets,acting as a hole accumulation layer （HALs） between Ti3C2Tx and tin oxides.Herein,the sensing mechanism based on the formation of hetero-junctions and high conductivity of the metallic phase of Ti3C2Tx MXene in SnO-SnO2/Ti3C2Tx sensors was discussed in detail.
Zijing Wang1，Fen Wang1，Angga Hermawan2，Yusuke Asakura2，Takuya Hasegawa2，Hiromu Kumagai2，Hideki Kato2，Masato Kakihana2,3，Jianfeng Zhu1，Shu Yin2
1. School of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University3. The Institute of Scientific and Industrial Research (ISIR), Osaka University Mihogaoka 8-1
摘 要：Acetone,as widely used reagents in industry and laboratories,are extremely harmful to the human.So the detection of acetone gas concentrations and leaks in special environments at room temperature is essential.Herein,the nanocomposite combining SnO-SnO2（p-n junction） and Ti3C2Tx MXene was successfully synthesized by a one-step hydrothermal method.Because of the existence of a small amount of oxygen during the hydrothermal conditions,part of the p-type Sn O was oxidized to n-type SnO2,forming in-situ p-n junctions on the surface of Sn O.The hamburger-like SnO-SnO2/Ti3C2Tx sensor exhibited improved acetone gas sensing response of 12.1 （Rg/Ra） at room temperature,which were nearly 11 and 4 times higher than those of pristine Ti3C2Tx and pristine Sn O-Sn O2,respectively.Moreover,it expressed a short recovery time （9 s） and outstanding reproducibility.Because of the different work functions,the Schottky barrier was formed between the Sn O and the Ti3C2Tx nanosheets,acting as a hole accumulation layer （HALs） between Ti3C2Tx and tin oxides.Herein,the sensing mechanism based on the formation of hetero-junctions and high conductivity of the metallic phase of Ti3C2Tx MXene in SnO-SnO2/Ti3C2Tx sensors was discussed in detail.
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