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

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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
Volume8
Issue number14
DOIs
StatePublished - Apr 14 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Green synthesis of reduced Ti<sub>3</sub>C<sub>2</sub>T<sub>: X</sub> MXene nanosheets with enhanced conductivity, oxidation stability, and SERS activity'. Together they form a unique fingerprint.

Cite this