Adomaviciute-Grabusove Sonata, Popov Anton, Ramanavicius Simonas, Sablinskas Valdas, Shevchuk Kateryna, Gogotsi Oleksiy, Baginskiy Ivan, Gogotsi Yury, Ramanavicius Arunas
Institute of Chemical Physics, Vilnius University, Sauletekio Av. 3, LT-10257 Vilnius, Lithuania.
NanoTechnas─Center of Nanotechnology and Materials Science, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko St. 24, LT-03225 Vilnius, Lithuania.
ACS Nano. 2024 May 21;18(20):13184-13195. doi: 10.1021/acsnano.4c02150. Epub 2024 May 6.
Extending applications of TiCT MXene in nanocomposites and across fields of electronics, energy storage, energy conversion, and sensor technologies necessitates simple and efficient analytical methods. Raman spectroscopy is a critical tool for assessing MXene composites; however, high laser powers and temperatures can lead to the materials' deterioration during the analysis. Therefore, an in-depth understanding of MXene photothermal degradation and changes in its oxidation state is required, but no systematic studies have been reported. The primary aim of this study was to investigate the degradation of the MXene lattice through Raman spectroscopic analysis. Distinct spectral markers were related to structural alterations within the TiCT material after subjecting it to thermal- and laser-induced degradation. During the degradation processes, spectral markers were revealed for several specific steps: a decrease in the number of interlayer water molecules, a decrease in the number of -OH groups, formation of C-C bonds, oxidation of the lattice, and formation of TiO nanoparticles (first anatase, followed by rutile). By tracking of position shifts and intensity changes for TiCT, the spectral markers that signify the initiation of each step were found. This spectroscopic approach enhances our understanding of the degradation pathways of MXene, and facilitating enhanced and dependable integration of these materials into devices for diverse applications, from energy storage to sensors.
拓展TiCT MXene在纳米复合材料以及电子、能量存储、能量转换和传感器技术等领域的应用需要简单高效的分析方法。拉曼光谱是评估MXene复合材料的关键工具；然而，高激光功率和温度会导致材料在分析过程中劣化。因此，需要深入了解MXene的光热降解及其氧化态的变化，但尚未有系统的研究报道。本研究的主要目的是通过拉曼光谱分析研究MXene晶格的降解。在对TiCT材料进行热诱导和激光诱导降解后，独特的光谱标记与材料内部的结构变化相关。在降解过程中，揭示了几个特定步骤的光谱标记：层间水分子数量减少、-OH基团数量减少、C-C键形成、晶格氧化以及TiO纳米颗粒的形成（首先是锐钛矿，随后是金红石）。通过跟踪TiCT的位置偏移和强度变化，发现了表示每个步骤起始的光谱标记。这种光谱方法增进了我们对MXene降解途径的理解，并有助于将这些材料更有效、可靠地集成到从能量存储到传感器等各种应用的器件中。
