Covalently Functionalized MXenes for Highly Sensitive Humidity Sensors

Janica I, Montes-Garcia V, Urban F, Hashemi P, Nia AS, Feng X, Samori P, Ciesielski A (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Small Methods John Wiley & Sons Ltd

DOI: 10.1002/smtd.202201651

Abstract

Transition metal carbides and nitrides (MXenes) are an emerging class of 2D materials, which are attracting ever-growing attention due to their remarkable physicochemical properties. The presence of various surface functional groups on MXenes’ surface, e.g., -F, -O, -OH, -Cl, opens the possibility to tune their properties through chemical functionalization approaches. However, only a few methods have been explored for the covalent functionalization of MXenes and include diazonium salt grafting and silylation reactions. Here, an unprecedented two-step functionalization of Ti3C2Tx MXenes is reported, where (3-aminopropyl)triethoxysilane is covalently tethered to Ti3C2Tx and serves as an anchoring unit for subsequent attachment of various organic bromides via the formation of C-N bonds. Thin films of Ti3C2Tx functionalized with linear chains possessing increased hydrophilicity are employed for the fabrication of chemiresistive humidity sensors. The devices exhibit a broad operation range (0–100% relative humidity), high sensitivity (0.777 or 3.035), a fast response/recovery time (0.24/0.40 s ΔH−1, respectively), and high selectivity to water in the presence of saturated vapors of organic compounds. Importantly, our Ti3C2Tx-based sensors display the largest operating range and a sensitivity beyond the state of the art of MXenes-based humidity sensors. Such outstanding performance makes the sensors suitable for real-time monitoring applications.

Involved external institutions

Adam Mickiewicz University / Uniwersytet im. Adama Mickiewicza w Poznaniu (UAM) PL Poland (PL) Université de Strasbourg (UDS) FR France (FR) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Janica, I., Montes-Garcia, V., Urban, F., Hashemi, P., Nia, A.S., Feng, X.,... Ciesielski, A. (2023). Covalently Functionalized MXenes for Highly Sensitive Humidity Sensors. Small Methods. https://doi.org/10.1002/smtd.202201651

MLA:

Janica, Iwona, et al. "Covalently Functionalized MXenes for Highly Sensitive Humidity Sensors." Small Methods (2023).

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