Effects of Synthesis and Processing on Optoelectronic Properties of Titanium Carbonitride MXene
- Drexel Univ., Philadelphia, PA (United States)
- Univ. of Nebraska, Lincoln, NE (United States)
- Drexel Univ., Philadelphia, PA (United States); Mahidol Univ., Bangkok (Thailand)
- Mahidol Univ., Bangkok (Thailand)
MXenes, a relatively new class of two-dimensional (2D) transition-metal carbides, carbonitrides, and nitrides, exhibit unique properties such as high electronic conductivity, a wide range of optical characteristics, hydrophilicity, and mechanical stability. Because of the high electronic conductivity, MXenes have shown promise in many applications, such as energy storage, electromagnetic interference shielding, antennas, and transparent coatings. 2D titanium carbide (Ti3C2Tx, where Tx represents surface terminations), the first discovered and most studied MXene, has the highest electronic conductivity exceeding 10 000 S cm–1. There have been several efforts to alter the conductivity of MXenes, such as manipulation of the transition-metal layer and control of surface terminations. However, the impact of the C and N site composition on electronic transport has not been explored. In this study, the effects of synthesis methods on optoelectronic properties of 2D titanium carbonitride, Ti3CNTx, were systematically investigated. We show that Ti3CNTx, which hosts a mix of carbon and nitrogen atoms in the X layer, has lower electronic conductivity and a blue shift of the main absorption feature within the UV–visible spectrum, compared to Ti3C2Tx. Moreover, intercalants such as water and tetraalkylammonium hydroxides decrease the electronic conductivity of MXene due to increased interflake resistance, leading to an increase in resistivity with decreasing temperature as observed in ensemble transport measurements. When the intercalants are removed, Ti3CNTx exhibits its intrinsic metallic behavior in good agreement with Hall measurements and transport properties measured on single-flake field-effect transistor devices. Finally, the dependence of conductivity of Ti3CNTx on the presence of intercalants opens wide opportunities for creating MXene-based materials with tunable electronic properties.
- Research Organization:
- Drexel Univ., Philadelphia, PA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0018618
- OSTI ID:
- 1774175
- Journal Information:
- Chemistry of Materials, Vol. 31, Issue 8; ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Scalable Synthesis of Ti 3 C 2 T x MXene
|
journal | March 2020 |
MXene‐Based Dendrite‐Free Potassium Metal Batteries
|
journal | November 2019 |
Distinguishing electronic contributions of surface and sub-surface transition metal atoms in Ti-based MXenes
|
journal | February 2020 |
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