期刊
ACS APPLIED NANO MATERIALS
卷 4, 期 12, 页码 14249-14257出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c03814
关键词
MXene; thin film; cation intercalation; self-assembly; gas sensor
资金
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [2021R1C1C1006385, 2021M3H4A1A03047327]
- KIST Internal Research Programs - Korea Institute of Science and Technology (KIST)
- National Research Foundation of Korea [2021R1C1C1006385, 2021M3H4A1A03047327] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
MXenes are promising materials for functional transparent thin films due to their high conductivity, transparency, and two-dimensional morphology. Intercalation of metal ions into MXene films through a spontaneous self-assembly method enhances film properties and device performance, with potential applications in gas sensing.
High conductivity and transparency and sheet-like two-dimensional morphology of MXenes make them attractive for use as functional transparent thin films. In addition, because of the dense surface functional groups and negative surface charge of the MXene sheet, cationic species can be easily intercalated into MXene interlayers to largely enhance the film properties and device performance. In this paper, for the first time, we demonstrate a spontaneous self-assembly method to efficiently intercalate metal ions into MXene transparent thin films with cation-dependent properties. Unlike in previous methods that intercalate ions after film assembly, monovalent and divalent metal ions are easily intercalated during the self-assembly process within a very short period of time. The optoelectronic properties are dependent on the intercalated cation where uniformly assembled ion-intercalated Ti3C2Tx MXene thin films exhibited on average a high optical transmittance of similar to 90% at a wavelength of 550 nm. The ion-intercalated MXene films were utilized as gas sensors to detect ammonia gas. Interestingly, metal-ion-intercalated films showed a much higher signal-to-noise ratio upon exposure to ammonia gas compared to that of films assembled without metal ions, demonstrating the positive influence of metal-ion intercalation on enhancing the gas-sensing performance.
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