Environment-Sensitive Photoresponse of Spontaneously Partially Oxidized Ti₃C₂ MXene Thin Films
A large family of two-dimensional transition metal carbides and nitrides (MXenes) has increasingly raised interest for electronic and optoelectronic applications due to their high electrical conductivity, potentially tunable electronic structure, nonlinear optical properties, and ability to be manufactured in the thin film state. During delamination and storage in ambient air environment, spontaneous oxidation of MXene flakes leads to formation of titanium oxide, a process that, as we demonstrate here, can be harnessed for manufacturing MXene-titania composites for optoelectronics, sensing, and other applications. We show that partially oxidized MXene thin films containing the in situ formed phase of titanium oxide have a significant photoresponse in the UV region of the spectrum. The relaxation process of photoexcited charge carriers takes a long time (~24 h) but can be accelerated in the presence of oxygen and water vapor in the atmosphere. These properties of spontaneously formed MXene-titania thin films make them attractive materials for photoresistors with memory effect and sensitivity to the environment, as well as many other photo- and environment-sensing applications.
S. Chertopalov and V. Mochalin, "Environment-Sensitive Photoresponse of Spontaneously Partially Oxidized Ti₃C₂ MXene Thin Films," ACS Nano, vol. 12, no. 6, pp. 6109-6116, American Chemical Society (ACS), Jun 2018.
The definitive version is available at https://doi.org/10.1021/acsnano.8b02379
Materials Science and Engineering
Keywords and Phrases
MXene; photoresistors; photoresponse; sensors; Ti3C2; titanium oxide; two-dimensional materials
International Standard Serial Number (ISSN)
Article - Journal
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01 Jun 2018