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Freezing Titanium Carbide (MXenes) Aqueous Dispersions for Ultra-long-term Storage

Zhang, Jizhen, Kong, Na, Hegh, Dylan, Usman, Ken Aldren S., Guan, Guangwu, Qin, Si, Jurewicz, Izabela, Yang, Wenrong and Razal, Joselito M. (2020) Freezing Titanium Carbide (MXenes) Aqueous Dispersions for Ultra-long-term Storage ACS Applied Materials and Interfaces.

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am-2020-067285.R1_Proof_hi.pdf - Accepted version Manuscript
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Two-dimensional titanium carbide (Ti3C2Tx), or MXene, is a new nanomaterial that has attracted increasing interest due to its metallic conductivity, good solution processability, and excellent energy storage performance. However, Ti3C2Tx MXene flakes suffer from degradation through oxidation due to prolonged exposure to oxygenated water. Preventing the occurrence of oxidation i.e. the formation of TiO2 particles, was found to be the crucial to maintain MXene quality. In present work, we found that freezing aqueous MXene dispersions at low-temperature can effectively prevents the formation of TiO2 nanoparticles at the flake edge, which is known as the early stage of oxidation. The Ti3C2Tx flakes in frozen dispersion remains consistent in morphology and elemental composition for over 650 days, compared with freshly synthesized MXene; which in contrast, exhibits flake edge degradation within two days when stored at room temperature. This result suggests that freezing MXene dispersion dramatically postpones the oxidation of MXene flakes and the stored MXene dispersion can be treated as freshly prepared MXene. This work not only fundamentally fulfilled the study on temperature dependence of MXene oxidation, but has also demonstrated a simple method to extend the shelf life of MXene aqueous dispersion to years, which will be a cornerstone for large scale production of MXene and ultimately benefit the research on MXenes.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Zhang, Jizhen
Kong, Na
Hegh, Dylan
Usman, Ken Aldren S.
Guan, Guangwu
Qin, Si
Yang, Wenrong
Razal, Joselito M.
Date : 3 July 2020
Funders : Australian Research Council, Australian National Fabrication Facility
DOI : 10.1021/acsami.0c06728
OA Location :
Grant Title : Australian Research Council Grant
Copyright Disclaimer : Copyright © 2020 American Chemical Society
Uncontrolled Keywords : MXene, oxidation, low-temperature, freezing, long-term storage
Additional Information : Embargo OK Metadata Pending. Accepted manuscript version is on publisher website, but final version forthcoming.
Depositing User : James Marshall
Date Deposited : 10 Jul 2020 14:07
Last Modified : 10 Jul 2020 14:07

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