TY - JOUR
T1 - SnO-SnO2 modified two-dimensional MXene Ti3C2Tx for acetone gas sensor working at room temperature
AU - Wang, Zijing
AU - Wang, Fen
AU - Hermawan, Angga
AU - Asakura, Yusuke
AU - Hasegawa, Takuya
AU - Kumagai, Hiromu
AU - Kato, Hideki
AU - Kakihana, Masato
AU - Zhu, Jianfeng
AU - Yin, Shu
N1 - Funding Information:
This work was supported financially by the National Natural Science Foundation of China (Nos., 51572158 and 51972200 ), and the Graduate Innovation Fund of Shaanxi University of Science & Technology . The present work was funded by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for the Scientific Research (KAKENHI Nos. 20H00297 and Innovative Area “Mixed Anion” (No. 16H06439 )), the Nippon Sheet Glass Foundation for Materials Science and Engineering , and by the Dynamic Alliance for Open Innovations Bridging Human, Environment and Materials, the Cooperative Research Program of “Network Joint Research Center for Materials and Devices” .
Publisher Copyright:
© 2020
PY - 2021/5/20
Y1 - 2021/5/20
N2 - 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 SnO was oxidized to n-type SnO2, forming in-situ p-n junctions on the surface of SnO. 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 SnO-SnO2, 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 SnO 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.
AB - 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 SnO was oxidized to n-type SnO2, forming in-situ p-n junctions on the surface of SnO. 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 SnO-SnO2, 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 SnO 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.
KW - Acetone gas sensor
KW - Nanocomposites
KW - Room temperature sensing
KW - TiCTx MXene
KW - p-n junction
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U2 - 10.1016/j.jmst.2020.07.040
DO - 10.1016/j.jmst.2020.07.040
M3 - Article
AN - SCOPUS:85092442055
SN - 1005-0302
VL - 73
SP - 128
EP - 138
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -