Abstract

The paper examined Ti3C2Tx MXene (T—OH, Cl or F), which is prepared by etching a layered ternary carbide Ti3AlC2 (312 MAX-phase) precursor and deposited on a polycaprolactone (PCL) electrospun membrane (MXene-PCL nanocomposite). X-ray Diffraction analysis (XRD) and Scanning Electron Microscopy (SEM) indicates that the obtained material is pure Ti3C2 MXene. SEM of the PCL-MXene composite demonstrate random Ti3C2 distribution over the nanoporous membrane. Results of capacitance, inductance, and phase shift angle studies of the MXene-PCL nanocomposite are presented. It was found that the frequency dependence of the capacitance exhibited a clear sharp minima in the frequency range of 50 Hz to over 104 Hz. The frequency dependence of the inductance shows sharp maxima, the position of which exactly coincides with the position of the minima for the capacitance, which indicates the occurrence of parallel resonances. Current conduction occurs by electron tunneling between nanoparticles. In the frequency range from about 104 Hz to about 105 Hz, there is a broad minimum on the inductance relationship. The position of this minimum coincides exactly with the position of the maximum of the phase shift angle—its amplitude is close to 90°. The real value of the inductance of the nanocomposite layer was determined to be about 1 H. It was found that the average value of the distance over which the electron tunnels was determined with some approximation to be about 5.7 nm and the expected value of the relaxation time to be τM ≈ 3 × 10−5 s.

Highlights

  • Mxenotronics is a currently growing discipline [1], within the framework of which the application of MXenes in electronics, electrical devices, and photovoltaics is being carried out

  • The aluminum layer in Ti3 AlC2 was removed by hydrofluoric acid formed an in-situ via reaction between HCl and LiF, leaving Ti3 C2 flakes weakly bonded through Van der Vaals interaction

  • Scanning Electron Microscopy (SEM) demonstrates that MXene has a typical shape, with a size from 25 to 500 nm

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Summary

Introduction

Mxenotronics is a currently growing discipline [1], within the framework of which the application of MXenes in electronics, electrical devices, and photovoltaics is being carried out. To extend a field of application, new structural features and properties of MXenes need to be considered and reviewed. Supercapacitors and batteries are only starting to employ Mxene-based components as substitutes for Li-ion accumulators [2,3]. MXenes in photovoltaics by far were applied for hole/electron transport layers and electrodes. They demonstrate much better performance in energy conversion, reduced trap state, and better charge transfer [4,5,6,7].

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