Effects of Synthesis and Processing on Optoelectronic Properties of Titanium Carbonitride MXene

MXenes, a relatively new class of two-dimensional (2D) transitionmetal carbides, carbonitrides, and nitrides, exhibit unique properties such as high electronic conductivity, a wide range of optical characteristics, hydrophilicity, and mechanical stability. In most bulk transition-metal carbides and carbonitrides, the electronic conductivity increases with nitrogen content because of increased density of states (DOS) at the Fermi level resulting from the extra electrons of the nitrogen atoms. UV-visible spectroscopy measurements were conducted using a spectrometer, scanning from 200 to 1000 nm and normalized at 264 nm. The increase of sheet resistance was only observed for the very thin films. Transport property measurements were conducted in a physical property measurement system. Electronic and transport properties of free-standing MXene films were studied to provide insights into the role of the X site composition on electronic behavior.