Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room Temperature
Owing to high electrical conductivity, layered structure, and abundant surface functional groups, transition metal carbides/nitrides (MXenes) have received enormous interest in the field of gas sensors at room temperature. In this work, we synthesize a heterostructured nanocomposite with indium oxid...
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2025-07-01
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| author | Yongjing Guo Zhengxin Zhang Hangshuo Feng Qingfu Dai Qiuni Zhao Zaihua Duan Shenghui Guo Li Yang Ming Hou Yi Xia |
| author_facet | Yongjing Guo Zhengxin Zhang Hangshuo Feng Qingfu Dai Qiuni Zhao Zaihua Duan Shenghui Guo Li Yang Ming Hou Yi Xia |
| author_sort | Yongjing Guo |
| collection | DOAJ |
| description | Owing to high electrical conductivity, layered structure, and abundant surface functional groups, transition metal carbides/nitrides (MXenes) have received enormous interest in the field of gas sensors at room temperature. In this work, we synthesize a heterostructured nanocomposite with indium oxide (In<sub>2</sub>O<sub>3</sub>) decorated on titanium carbide (Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i>) nanosheets by electrostatic self-assembly and develop it for high-selectivity NO<sub>2</sub> gas sensing at room temperature. Self-assembly formation of multiple heterojunctions in the In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> composite provide abundant NO<sub>2</sub> gas adsorption sites and high electron transfer activity, which is conducive to improving the gas-sensing response of the In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> gas sensor. Assisted by rich adsorption sites and hetero interface, the as-fabricated In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> gas sensor exhibits the highest response to NO<sub>2</sub> among various interference gases. Meanwhile, a detection limit of 0.3 ppm, and response/recovery time (197.62/93.84 s) is displayed at room temperature. Finally, a NO<sub>2</sub> sensing mechanism of In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> gas sensor is constructed based on PN heterojunction enhancement and molecular adsorption. This work not only expands the gas-sensing application of MXenes, but also demonstrates an avenue for the rational design and construction of NO<sub>2</sub>-sensing materials. |
| format | Article |
| id | doaj-art-2d0731fcbe084b91bb422837487479ba |
| institution | DOAJ |
| issn | 2227-9040 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
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| series | Chemosensors |
| spelling | doaj-art-2d0731fcbe084b91bb422837487479ba2025-08-20T03:08:09ZengMDPI AGChemosensors2227-90402025-07-0113724910.3390/chemosensors13070249Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room TemperatureYongjing Guo0Zhengxin Zhang1Hangshuo Feng2Qingfu Dai3Qiuni Zhao4Zaihua Duan5Shenghui Guo6Li Yang7Ming Hou8Yi Xia9Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaState Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaOwing to high electrical conductivity, layered structure, and abundant surface functional groups, transition metal carbides/nitrides (MXenes) have received enormous interest in the field of gas sensors at room temperature. In this work, we synthesize a heterostructured nanocomposite with indium oxide (In<sub>2</sub>O<sub>3</sub>) decorated on titanium carbide (Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i>) nanosheets by electrostatic self-assembly and develop it for high-selectivity NO<sub>2</sub> gas sensing at room temperature. Self-assembly formation of multiple heterojunctions in the In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> composite provide abundant NO<sub>2</sub> gas adsorption sites and high electron transfer activity, which is conducive to improving the gas-sensing response of the In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> gas sensor. Assisted by rich adsorption sites and hetero interface, the as-fabricated In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> gas sensor exhibits the highest response to NO<sub>2</sub> among various interference gases. Meanwhile, a detection limit of 0.3 ppm, and response/recovery time (197.62/93.84 s) is displayed at room temperature. Finally, a NO<sub>2</sub> sensing mechanism of In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> gas sensor is constructed based on PN heterojunction enhancement and molecular adsorption. This work not only expands the gas-sensing application of MXenes, but also demonstrates an avenue for the rational design and construction of NO<sub>2</sub>-sensing materials.https://www.mdpi.com/2227-9040/13/7/249MXeneTi<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i>In<sub>2</sub>O<sub>3</sub>gas sensingheterostructureelectrostatic self-assembly |
| spellingShingle | Yongjing Guo Zhengxin Zhang Hangshuo Feng Qingfu Dai Qiuni Zhao Zaihua Duan Shenghui Guo Li Yang Ming Hou Yi Xia Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room Temperature Chemosensors MXene Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> In<sub>2</sub>O<sub>3</sub> gas sensing heterostructure electrostatic self-assembly |
| title | Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room Temperature |
| title_full | Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room Temperature |
| title_fullStr | Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room Temperature |
| title_full_unstemmed | Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room Temperature |
| title_short | Electrostatic Self-Assembly of Heterostructured In<sub>2</sub>O<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> Nanocomposite for High-Selectivity NO<sub>2</sub> Gas Sensing at Room Temperature |
| title_sort | electrostatic self assembly of heterostructured in sub 2 sub o sub 3 sub ti sub 3 sub c sub 2 sub t i sub x sub i nanocomposite for high selectivity no sub 2 sub gas sensing at room temperature |
| topic | MXene Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> In<sub>2</sub>O<sub>3</sub> gas sensing heterostructure electrostatic self-assembly |
| url | https://www.mdpi.com/2227-9040/13/7/249 |
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