Jin Jing, Song Wei, Zhang Ning, Li Linjia, Liu Hao, Yang Bai, Zhao Bing
State Key Laboratory of Supramolecular Structure and Materials, Jilin University Changchun 130012 P. R. China
RSC Adv. 2020 Jul 16;10(45):26639-26645. doi: 10.1039/d0ra00168f. eCollection 2020 Jul 15.
In the present study, a novel hybrid nanomaterial composed of core-shell structured Ag@carbon dot (CD) modified TiO nanofibers (NFs) was successfully fabricated a simple two-step strategy for the first time. Herein, the Ag@CDs-TiO NFs are demonstrated to be an efficient SERS substrate. The strong LSPR-induced electromagnetic enhancement (EM) by Ag@CDs NPs and efficient charge transfer (CT) effect between Ag@CDs and TiO NFs synergistically contribute to the excellent SERS enhancement. In addition, the Ag@CDs-TiO NFs exhibit enhanced photocatalytic activity regarding the organic pollutant degradation under visible light irradiation because of the enhanced light absorption and improved separation of photo-generated electron-hole pairs. Thus, this new nanocomposite can be used as a sensitive SERS substrate for determining the catalytic activity and reaction kinetics during the photodegradation of methylene blue (MB). Compared with UV-vis spectroscopy, the SERS technique enables more accurate monitoring of the changes of adsorption molecules and actual catalytic process on the surface of the catalyst. These results are significant for the development of metal or semiconductor-based catalysts for ensuring optoelectronic, energy and environmental applications.
在本研究中，首次采用一种简单的两步策略成功制备了一种由核壳结构的Ag@碳点（CD）修饰的TiO纳米纤维（NFs）组成的新型杂化纳米材料。在此，Ag@CDs-TiO NFs被证明是一种高效的表面增强拉曼光谱（SERS）基底。Ag@CDs纳米颗粒强烈的局域表面等离子体共振（LSPR）诱导的电磁增强（EM）以及Ag@CDs与TiO NFs之间有效的电荷转移（CT）效应协同促成了优异的SERS增强效果。此外，由于光吸收增强以及光生电子-空穴对的分离改善，Ag@CDs-TiO NFs在可见光照射下对有机污染物降解表现出增强的光催化活性。因此，这种新型纳米复合材料可用作灵敏的SERS基底，用于测定亚甲基蓝（MB）光降解过程中的催化活性和反应动力学。与紫外可见光谱相比，SERS技术能够更准确地监测催化剂表面吸附分子的变化和实际催化过程。这些结果对于开发用于光电子、能源和环境应用的金属或半导体基催化剂具有重要意义。
