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Title: Effect of Synthesis on Quality, Electronic Properties and Environmental Stability of Individual monolayer Ti3C2 MXene Flakes

2D transition metal carbide Ti 3C 2T x (T stands for surface termination), the most widely studied MXene, has shown outstanding electrochemical properties and promise for a number of bulk applications. However, electronic properties of individual MXene flakes, which are important for understanding the potential of these materials, remain largely unexplored. Herein, a modified synthetic method is reported for producing high-quality monolayer Ti 3C 2T x flakes. Field-effect transistors (FETs) based on monolayer Ti 3C 2T x flakes are fabricated and their electronic properties are measured. Individual Ti3C2Tx flakes exhibit a high conductivity of 4600 ± 1100 S cm -1 and field-effect electron mobility of 2.6 ± 0.7 cm2 V -1 s -1. The resistivity of multilayer Ti 3C 2T x films is only one order of magnitude higher than the resistivity of individual flakes, which indicates a surprisingly good electron transport through the surface terminations of different flakes, unlike in many other 2D materials. Finally, the fabricated FETs are used to investigate the environmental stability and kinetics of oxidation of Ti3C2Tx flakes in humid air. The high-quality Ti 3C 2T x flakes are reasonably stable and remain highly conductive even after their exposure to air for more than 24more » h. It is demonstrated that after the initial exponential decay the conductivity of Ti 3C 2T x flakes linearly decreases with time, which is consistent with their edge oxidation.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [1]
  1. University of Nebraska
  2. Drexel University
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Advanced Electronic Materials
Additional Journal Information:
Journal Volume: 2; Journal ID: ISSN 2199-160X
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
OSTI Identifier:
1337030