Green synthesis of reduced Ti3C2T: X MXene nanosheets with enhanced conductivity, oxidation stability, and SERS activity

Tej B. Limbu, Basant Chitara, Jason D. Orlando, Martha Y. Garcia Cervantes, Shalini Kumari, Qi Li, Yongan Tang, Fei Yan

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Transition metal carbides (MXenes) are an emerging family of highly conductive two-dimensional materials with additional functional properties introduced by surface terminations. Further modification of the surface terminations makes MXenes even more appealing for practical applications. Herein, we report a facile and environmentally benign synthesis of reduced Ti3C2Tx MXene (r-Ti3C2Tx) via a simple treatment with l-ascorbic acid at room temperature. r-Ti3C2Tx shows a six-fold increase in electrical conductivity, from 471 ± 49 for regular Ti3C2Tx to 2819 ± 306 S m-1 for the reduced version. Additionally, we show an enhanced oxidation stability of r-Ti3C2Tx as compared to regular Ti3C2Tx. An examination of the surface-enhanced Raman scattering (SERS) activity reveals that the SERS enhancement factor of r-Ti3C2Tx is an order of magnitude higher than that of regular Ti3C2Tx. The improved SERS activity of r-Ti3C2Tx is attributed to the charge transfer interaction between the MXene surface and probe molecules, re-enforced by an increased electronic density of states (DOS) at the Fermi level of r-Ti3C2Tx. The findings of this study suggest that reduced MXene could be a superior choice over regular MXene, especially for the applications that employ high electronic conductivity, such as electrode materials for batteries and supercapacitors, photodetectors, and SERS-based sensors.

Original languageEnglish (US)
Pages (from-to)4722-4731
Number of pages10
JournalJournal of Materials Chemistry C
Issue number14
StatePublished - Apr 14 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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