Interfacial Assembly of Ultrathin, Functional MXene Films
- Interfacial Assembly of Ultrathin, Functional MXene Films
- 김선준; 최정훈; Kathleen Maleski; Kanit Hantanasirisakul; 정희태; Yury Gogotsi; 안치원
- MXene; interfacial self-assembly; conformal transfer; thin film; gas sensor
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 11, NO 35-32327
- MXenes are a prominent family of two-dimensional materials because of their metallic conductivity and abundant surface functionalities. Although MXenes have been extensively studied as bulk particles or free-standing films, thin and transparent films are needed for optical, optoelectronic, sensing, and other applications. In this study, we demonstrate a facile method to fabricate ultrathin (∼10 nm), Ti3C2Tx MXene films by an interfacial assembly technique. The self-assembling behavior of MXene flakes resulted in films with a high stacking order and strong plane-to-plane adherence, where optimal films of 10 nm thickness displayed a low sheet resistance of 310 Ω/□. By using surface tension, films were transferred onto various types of planar and curved substrates. Moreover, multiple films were consecutively transferred onto substrates from a single batch of solution, showing the efficient use of the material. When the films were utilized as gas sensing channels, a high signal-to-noise ratio, up to 320, was observed, where the gas response of films assembled from small MXene flakes was 10 times larger than that from large flakes. This work provides a facile and efficient method to allow MXenes to be further exploited for thin-film applications.
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