Interfacial Assembly of Ultrathin, Functional MXene Films

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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 (similar to 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 Omega/square. 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.
Publisher
AMER CHEMICAL SOC
Issue Date
2019-09
Language
English
Article Type
Article
Citation

ACS APPLIED MATERIALS & INTERFACES, v.11, no.35, pp.32320 - 32327

ISSN
1944-8244
DOI
10.1021/acsami.9b12539
URI
http://hdl.handle.net/10203/267734
Appears in Collection
CBE-Journal Papers(저널논문)
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