Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 Sensors
Abstract Molybdenum disulfide (MoS2) is a promising electronic material owing to its excellent electrochemical features, high carrier mobility at room temperature, and widely tunable electronic properties. Here, through precursor engineering and post‐treatments to tailor their phase and doping, elec...
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2025-01-01
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| Online Access: | https://doi.org/10.1002/advs.202410825 |
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| author | Jiyun Kim Mengyao Li Chun‐Ho Lin Long Hu Tao Wan Ayad Saeed Peiyuan Guan Zijian Feng Tushar Kumeria Jianbo Tang Dawei Su Tom Wu Dewei Chu |
| author_facet | Jiyun Kim Mengyao Li Chun‐Ho Lin Long Hu Tao Wan Ayad Saeed Peiyuan Guan Zijian Feng Tushar Kumeria Jianbo Tang Dawei Su Tom Wu Dewei Chu |
| author_sort | Jiyun Kim |
| collection | DOAJ |
| description | Abstract Molybdenum disulfide (MoS2) is a promising electronic material owing to its excellent electrochemical features, high carrier mobility at room temperature, and widely tunable electronic properties. Here, through precursor engineering and post‐treatments to tailor their phase and doping, electronic characteristics of MoS2 are significantly modified. It is found that 2H semiconductor phase with nitrogen doping (N‐doping) in flexible gas sensors constructed with Ag electrodes exhibits the highest sensitivity of ≈2500% toward 10 ppm of NO2. This sensitivity is ≈17‐ and 417‐folds higher than that of 2H MoS2 without N‐doping, and mixed phases with metallic 1T and semiconductor 2H phase, respectively. Comprehensive experimental investigations reveal mechanisms underlying this record sensitivity, that is, the use of N‐doped 2H MoS2 sensors not only significantly suppresses dark current but also effectively enhances electron transfer to NO2 molecules. Moreover, density function theory calculations underpin the experimental results, confirming that N2H4 molecules from the precursor solution not only promote phase transition but also enable N‐doping during post‐treatments, thus boosting sensing capability. This work, for the first time, reveals the synergistic effect of phase modulation and N‐doping of MoS2, which can be readily used in other flexible electronic applications, advancing MoS2‐based electronics to a new stage. |
| format | Article |
| id | doaj-art-52e64e9764a34e1596975182561fdc7e |
| institution | Kabale University |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
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| series | Advanced Science |
| spelling | doaj-art-52e64e9764a34e1596975182561fdc7e2025-01-29T09:50:19ZengWileyAdvanced Science2198-38442025-01-01124n/an/a10.1002/advs.202410825Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 SensorsJiyun Kim0Mengyao Li1Chun‐Ho Lin2Long Hu3Tao Wan4Ayad Saeed5Peiyuan Guan6Zijian Feng7Tushar Kumeria8Jianbo Tang9Dawei Su10Tom Wu11Dewei Chu12School of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Chemical Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaSchool of Science The Royal Melbourne Institute of Technology (RMIT) Melbourne VIC 3000 AustraliaDepartment of Applied Physics The Hong Kong Polytechnic University Kowloon Hong Kong ChinaSchool of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 AustraliaAbstract Molybdenum disulfide (MoS2) is a promising electronic material owing to its excellent electrochemical features, high carrier mobility at room temperature, and widely tunable electronic properties. Here, through precursor engineering and post‐treatments to tailor their phase and doping, electronic characteristics of MoS2 are significantly modified. It is found that 2H semiconductor phase with nitrogen doping (N‐doping) in flexible gas sensors constructed with Ag electrodes exhibits the highest sensitivity of ≈2500% toward 10 ppm of NO2. This sensitivity is ≈17‐ and 417‐folds higher than that of 2H MoS2 without N‐doping, and mixed phases with metallic 1T and semiconductor 2H phase, respectively. Comprehensive experimental investigations reveal mechanisms underlying this record sensitivity, that is, the use of N‐doped 2H MoS2 sensors not only significantly suppresses dark current but also effectively enhances electron transfer to NO2 molecules. Moreover, density function theory calculations underpin the experimental results, confirming that N2H4 molecules from the precursor solution not only promote phase transition but also enable N‐doping during post‐treatments, thus boosting sensing capability. This work, for the first time, reveals the synergistic effect of phase modulation and N‐doping of MoS2, which can be readily used in other flexible electronic applications, advancing MoS2‐based electronics to a new stage.https://doi.org/10.1002/advs.202410825hydrazineMoS2N‐dopingNO2 sensorphase modulation |
| spellingShingle | Jiyun Kim Mengyao Li Chun‐Ho Lin Long Hu Tao Wan Ayad Saeed Peiyuan Guan Zijian Feng Tushar Kumeria Jianbo Tang Dawei Su Tom Wu Dewei Chu Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 Sensors Advanced Science hydrazine MoS2 N‐doping NO2 sensor phase modulation |
| title | Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 Sensors |
| title_full | Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 Sensors |
| title_fullStr | Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 Sensors |
| title_full_unstemmed | Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 Sensors |
| title_short | Synergetic Phase Modulation and N‐Doping of MoS2 for Highly Sensitive Flexible NO2 Sensors |
| title_sort | synergetic phase modulation and n doping of mos2 for highly sensitive flexible no2 sensors |
| topic | hydrazine MoS2 N‐doping NO2 sensor phase modulation |
| url | https://doi.org/10.1002/advs.202410825 |
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