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Changing the transition-metal layers in a particular MXene produced a material with semiconductor-like electrical transport in laboratory measurements. In a 2016 study, researchers found that Mo2TiC2Tx behaved differently from metallic Ti3C2Tx. The phrase “between the sheets” is a metaphor: the work changed the metals within the layered carbide structure; it did not insert a separate semiconductor between sheets.
What the researchers changed
MXenes are layered transition-metal carbides or nitrides. The 2016 study focused on double-transition-metal carbides, including Mo2TiC2 and Mo2Ti2C3. In these compositions, molybdenum occupies the outer transition-metal layers, with titanium also present in the structure.
To examine the structure, the researchers used X-ray atomic pair-distribution function analysis. This provided structural evidence that molybdenum was in the outer layers, connecting the chosen layer arrangement with the electrical behavior they investigated. The study was published as “Control of electronic properties of 2D carbides (MXenes) by manipulating their transition metal layers” in Nanoscale Horizons, volume 1, pages 227–234; it was first published on 24 February 2016. Read the paper at the Royal Society of Chemistry.
What “semiconductor-like” means in this study
The researchers measured how conductivity and magnetoresistance changed with temperature. They reported that Mo2TiC2Tx was no longer metallic-like: its resistance increased mildly as temperature decreased. The paper describes the temperature-dependent conductivity and magnetoresistance measurements as confirming semiconductor-like transport behavior in that composition.
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The comparison in the paper was with Ti3C2Tx, which behaved as a metal in the reported measurements. That is a result for these studied compositions, not evidence that all MXenes are semiconductors or that every change in metal-layer arrangement will produce the same behavior. The paper’s abstract and experimental report state the comparison directly.
Measured transport is not the same as a measured band gap
The paper also discusses density-functional-theory calculations. Those calculations suggested that OH-terminated Mo–Ti MXenes are semiconductors with narrow band gaps. This is a theoretical result for a specified surface termination; the abstract does not report a direct experimental measurement of that band gap. It should therefore be kept distinct from the measured temperature-dependent transport behavior.
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Why the result mattered
The result demonstrated a materials-design route worth investigating: changing which transition metal occupies particular layers can alter the electronic behavior of a layered carbide. It offered researchers another way to tune MXenes rather than treating the family as having one fixed electrical character. Yury Gogotsi, the study’s corresponding author, told Chemistry World: “We want to give the community a new family of materials that will provide building blocks for the technology of the future.” Chemistry World’s 16 March 2016 report provides the contemporary context.
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