Highly Conductive Optical Quality Solution-Processed Films of 2D Titanium Carbide

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• 作者：Andrew D. Dillon ; Michael J. Ghidiu ; Alex L. Krick ; Justin Griggs ; Steven J. May ; Yury Gogotsi ; Michel W. Barsoum and Aaron T. Fafarman
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：June 20, 2016
• 年：2016
• 卷：26
• 期：23
• 页码：4162-4168
• 全文大小：4587K
• ISSN：1616-3028

文摘

MXenes comprise a new class of solution-dispersable, 2D nanomaterials formed from transition metal carbides and nitrides such as Ti₃C₂. Here, it is shown that 2D Ti₃C₂ can be assembled from aqueous solutions into optical quality, nanometer thin films that, at 6500 S cm⁻¹, surpass the conductivity of other solution-processed 2D materials, while simultaneously transmitting >97% of visible light per-nanometer thickness. It is shown that this high conductivity is due to a metal-like free-electron density as well as a high degree of coplanar alignment of individual nanosheets achieved through spincasting. Consequently, the spincast films exhibit conductivity over a macroscopic scale that is comparable to the intrinsic conductivity of the constituent 2D sheets. Additionally, optical characterization over the ultraviolet-to-near-infrared range reveals the onset of free-electron plasma oscillations above 1130 nm. Ti₃C₂ is therefore a potential building block for plasmonic applications at near-infrared wavelengths and constitutes the first example of a new class of solution-processed, carbide-based 2D optoelectronic materials.