Dong Wen, Xu Zhou, Qianqian Fan, Can Cui, Kan Fang, Ling Ding, Xiaoai Ye, Shihao Zheng, Zhaokun Jiang, Yanke Zhou, Daqiang Zhao and Gui-Gen Wang
{"title":"超薄MXene导电薄膜的渗透驱动电子传输和厚度相关的微波吸收/屏蔽双重功能","authors":"Dong Wen, Xu Zhou, Qianqian Fan, Can Cui, Kan Fang, Ling Ding, Xiaoai Ye, Shihao Zheng, Zhaokun Jiang, Yanke Zhou, Daqiang Zhao and Gui-Gen Wang","doi":"10.1039/D5NR01970B","DOIUrl":null,"url":null,"abstract":"<p >The microwave interaction of ultrathin Ti<small><sub>3</sub></small>C<small><sub>2</sub></small>T<small><sub><em>x</em></sub></small> MXene films is governed by their nanosheet network-modulated conductivity. By integrating a transfer matrix model with the Drude model, this study reveals the dielectric response mechanisms of MXene films under microwave radiation, driven by nanosheet coverage (<em>c</em>) and thickness (<em>t</em>). For monolayer films, coverage-dependent conductivity transitions delineate two distinct regimes: (i) a discontinuous percolation regime (<em>c</em> < 80%) dominated by intra-flake electron transport (|<em>ε</em><small><sub>i</sub></small>/<em>ε</em><small><sub>r</sub></small>| < 1), resulting in high microwave transparency, and (ii) a metallic-like conduction regime (<em>c</em> > 80%) where synergistic intra-/inter-flake hopping (|<em>ε</em><small><sub>i</sub></small>/<em>ε</em><small><sub>r</sub></small>| > 1) enhances interfacial polarization and ohmic loss, enabling 27% maximum microwave absorption at a high sheet conductivity of ∼0.001 S (<em>c</em> = 93%). For multilayer continuous films, thickness dictates dual transport dynamics: sub-6.6 nm films exhibit surface/interface scattering-limited bulk conductivity (<em>σ</em> ∼ 3000 S cm<small><sup>−1</sup></small>, <em>τ</em> > 6 ps), while thicker films (<em>t</em> > 6.6 nm) transition to bulk-like metallic conduction (<em>σ</em> ∼ 13 000 S cm<small><sup>−1</sup></small>, <em>τ</em> < 6 ps), achieving concurrent 48% microwave absorption at 6.6 nm and 19 dB shielding at 24 nm. The percolation-governed conductivity scaling and thickness-modulated electron transport establish design principles for optimizing MXene-based ultrathin electromagnetic functional materials in microwave absorption, shielding, and flexible sensing applications, bridging nanoscale structural engineering with macroscopic functionality.</p>","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":" 29","pages":" 17040-17056"},"PeriodicalIF":5.1000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Ultrathin MXene conductive films with percolation-driven electron transport and thickness-dependent microwave absorption/shielding dual functionality†\",\"authors\":\"Dong Wen, Xu Zhou, Qianqian Fan, Can Cui, Kan Fang, Ling Ding, Xiaoai Ye, Shihao Zheng, Zhaokun Jiang, Yanke Zhou, Daqiang Zhao and Gui-Gen Wang\",\"doi\":\"10.1039/D5NR01970B\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >The microwave interaction of ultrathin Ti<small><sub>3</sub></small>C<small><sub>2</sub></small>T<small><sub><em>x</em></sub></small> MXene films is governed by their nanosheet network-modulated conductivity. By integrating a transfer matrix model with the Drude model, this study reveals the dielectric response mechanisms of MXene films under microwave radiation, driven by nanosheet coverage (<em>c</em>) and thickness (<em>t</em>). For monolayer films, coverage-dependent conductivity transitions delineate two distinct regimes: (i) a discontinuous percolation regime (<em>c</em> < 80%) dominated by intra-flake electron transport (|<em>ε</em><small><sub>i</sub></small>/<em>ε</em><small><sub>r</sub></small>| < 1), resulting in high microwave transparency, and (ii) a metallic-like conduction regime (<em>c</em> > 80%) where synergistic intra-/inter-flake hopping (|<em>ε</em><small><sub>i</sub></small>/<em>ε</em><small><sub>r</sub></small>| > 1) enhances interfacial polarization and ohmic loss, enabling 27% maximum microwave absorption at a high sheet conductivity of ∼0.001 S (<em>c</em> = 93%). For multilayer continuous films, thickness dictates dual transport dynamics: sub-6.6 nm films exhibit surface/interface scattering-limited bulk conductivity (<em>σ</em> ∼ 3000 S cm<small><sup>−1</sup></small>, <em>τ</em> > 6 ps), while thicker films (<em>t</em> > 6.6 nm) transition to bulk-like metallic conduction (<em>σ</em> ∼ 13 000 S cm<small><sup>−1</sup></small>, <em>τ</em> < 6 ps), achieving concurrent 48% microwave absorption at 6.6 nm and 19 dB shielding at 24 nm. The percolation-governed conductivity scaling and thickness-modulated electron transport establish design principles for optimizing MXene-based ultrathin electromagnetic functional materials in microwave absorption, shielding, and flexible sensing applications, bridging nanoscale structural engineering with macroscopic functionality.</p>\",\"PeriodicalId\":92,\"journal\":{\"name\":\"Nanoscale\",\"volume\":\" 29\",\"pages\":\" 17040-17056\"},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2025-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nanoscale\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://pubs.rsc.org/en/content/articlelanding/2025/nr/d5nr01970b\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nanoscale","FirstCategoryId":"88","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/nr/d5nr01970b","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Ultrathin MXene conductive films with percolation-driven electron transport and thickness-dependent microwave absorption/shielding dual functionality†
The microwave interaction of ultrathin Ti3C2Tx MXene films is governed by their nanosheet network-modulated conductivity. By integrating a transfer matrix model with the Drude model, this study reveals the dielectric response mechanisms of MXene films under microwave radiation, driven by nanosheet coverage (c) and thickness (t). For monolayer films, coverage-dependent conductivity transitions delineate two distinct regimes: (i) a discontinuous percolation regime (c < 80%) dominated by intra-flake electron transport (|εi/εr| < 1), resulting in high microwave transparency, and (ii) a metallic-like conduction regime (c > 80%) where synergistic intra-/inter-flake hopping (|εi/εr| > 1) enhances interfacial polarization and ohmic loss, enabling 27% maximum microwave absorption at a high sheet conductivity of ∼0.001 S (c = 93%). For multilayer continuous films, thickness dictates dual transport dynamics: sub-6.6 nm films exhibit surface/interface scattering-limited bulk conductivity (σ ∼ 3000 S cm−1, τ > 6 ps), while thicker films (t > 6.6 nm) transition to bulk-like metallic conduction (σ ∼ 13 000 S cm−1, τ < 6 ps), achieving concurrent 48% microwave absorption at 6.6 nm and 19 dB shielding at 24 nm. The percolation-governed conductivity scaling and thickness-modulated electron transport establish design principles for optimizing MXene-based ultrathin electromagnetic functional materials in microwave absorption, shielding, and flexible sensing applications, bridging nanoscale structural engineering with macroscopic functionality.
期刊介绍:
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.