The Preparation Of Graphene&MXene Based Conductive Materials And The Study Of Their Optical&Electrical Properties

The flexible circuit is a special circuit for mounting electronic components on a flexible substrate.It has the characteristics of light weight,thin thickness and bendability,and could be applicable in various fields such as foldable electronic paper,bendable phones,and wearable sensors,etc.Unlike conventional circuits made by lithography,vacuum deposition,or electroplating,flexible circuits use printing technology to inkjet different functional inks onto a variety of substrates.This type of printing has received great attention owing to its low cost,graphics,and environmental protection.The researches of flexible circuits are mainly concerntrated on obtaining conductive inks with high conductivity,good flexibility and strong adhesion.In this paper,we prepared graphene composite ink by combining low-cost graphene and high-conductivity AgNW,and tested the morphology and electrical properties of the obtained circuit.In the experiment,we adjusted the resistivity of the composite circuit by changing the length and content of AgNW and sintering temperature.The best resistivity of highly conductive graphene composite circuit reaches 8.6 m?·cm about 1/15 of a pure graphene circuit,which is far lower than that in the literatures.The theoretical conductivity of MXene material is analogous to that of metal.Firstly,we performed high-pressure XRD and high-pressure Raman tests for Ti3C2Tx MXene.At high pressure,Ti3C2Tx MXene exhibits no phase transition,and the calculated results shows that it has high elastic constant.High-pressure Raman spectra indicate that all phonon modes exhibit blueshift as the pressure increases.Then,the photoluminescence phenomenon of Ti3C2Tx MXene was studied.After surface modification,the defect energy level of Ti3C2Tx MXene is raised to achieve tunability.The theoretical calculations indicate that the tunable photoluminescence is caused by the absorption and emission of TiO2 and the weakened superposition of Ti3C2Tx MXene.Finally,we also explored the preparation of a novel metal/carbene material—Zr2AIC.