Defects- and interface-enhanced Raman scattering in low-dimensional optoelectronic materials
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摘要: 近年来，一系列新型低维光电材料相继涌现，展现出优异的性能。这些光电材料与表面增强拉曼散射(SERS)技术相结合，显示出巨大的应用潜力，有望成为高灵敏SERS活性基底。缺陷与界面调控是低维光电材料SERS应用的重要策略，本文将重点介绍新型低维光电材料缺陷与界面增强拉曼散射的种类和增强机理。通过对缺陷与界面增强拉曼散射的应用和研究前景的展望，启发人们对SERS研究的再思考和再认识。Abstract: In recent years, a series of new low-dimensional optoelectronic materials with excellent properties have emerged. Combined with surface-enhanced Raman scattering (SERS) technology, they show great application potential and are expected to become highly sensitive SERS substrates. Defects and interface regulation of low-dimensional optoelectronic materials are important strategies for their applications in SERS technology. In this paper, the types and enhancement mechanisms of defects- and interface-enhanced Raman scattering in new low-dimensional optoelectronic materials are introduced. By looking forward to the application and research prospect of defects- and interface-enhanced Raman scattering, this work might inspire people to reconsider and further understand the study of SERS.
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图 4 (a)本身具有周期性氧空位的二氧化钒纳米片的晶体结构示意图[25]；(b)合成富含氧空位的氧化钨纳米线利用电荷转移和等离激元共振协同增强拉曼散射的示意图[26]；(c)合成富含氧空位的氧化钼量子点与吸附分子体系的吸收光谱[28]；(d)锂溶液直接剥离富含硫空位的二维硫化钼示意图[31]
Figure 4. (a) Schematic diagram of crystal structures of vanadium dioxide nanosheets with periodic oxygen vacancies[25]; (b) schematic diagram of enhanced Raman scattering caused by the synergistic effect of surface plasmon resonance coupling and charge transfer in tungsten oxide nanowires with oxygen vacancies[26]; (c) UV-vis spectra of adsorbed molecules and molybdenum trioxide quantum dots with oxygen vacancies[28]; (d) schematic diagram of lithium-exfoliated molybdenum disulfide with suffur vacancies[31]
图 5 (a)退火形成富含氧空位的氧化钨纳米线的扫描电子显微镜图像(上)和吸收光谱(下)[29]；(b)水热反应制造富含氧空位的二氧化钛纳米线的扫描电子显微镜图像(上)和吸收光谱(下)[30]；(c)激光诱导富含硫空位的单层硫化钼的能带(上)和增强拉曼散射谱图(下)[32]
Figure 5. (a) Scanning electron microscopy image (top) and UV-vis spectra (bottom) of tungsten oxide nanowires rich in oxygen vacancies formed by annealing[29]; (b) scanning electron microscopy image (top) and UV-vis spectra (bottom) of titanium dioxide nanowires rich in oxygen vacancies produced by a hydrothermal reaction[30]; (c) bandgaps (top) and surface-enhanced Raman spectra (bottom) of femtosecond laser-treated molybdenum sulfide rich in sulfur vacancies[32]
图 6 (a)石墨烯与二硒化钨异质结利用层间电荷转移实现增强拉曼散射的示意图[33]；(b)富含氧空位的氧化钨与单层硫化钼异质结利用层间电荷转移和多种激子共振实现增强拉曼散射的示意图[34-35]；(c)单层硫化钼和二硒化锡异质结利用非辐射能量转移效应增强拉曼散射的示意图[36-37]；(d)外加磁场下形成的石墨烯和罗丹明6G三明治结构的示意图[38]
Figure 6. Schematic diagram of enhanced Raman scattering caused by (a) the interlayer charge transfer in the graphene and tungsten disulfide heterojunction[33], (b) the interlayer charge transfer and multiple exciton resonances in tungsten oxide rich in oxygen vacancies and with a monolayer molybdenum sulfide heterojunction[34-35], and (c) nonradiative energy transfer effect in monolayer molybdenum sulfide and tin diselenide heterostructure[36-37]; (d) pressure-induced surface enhanced Raman scattering in graphene-molecule-graphene sandwich structures under an external magnetic field[38]
图 7 (a)硫化钼量子点和二维还原氧化石墨烯界面结构的能带和态密度[39]；(b)混杂二氧化钨和碳纳米线束状界面结构的吸收光谱[40]；(c)石墨烯量子点形成一维纳米管和其表面增强拉曼散射的示意图[41]
Figure 7. (a) The energy band and density of the states of the interface structure between a molybdenum disulfide quantum dot and reduced graphene oxide[39]; (b) UV-vis spectra of hybrid tungsten dioxide/carbon ultrathin nanowire beams[40]; (c) scheme of the fabrication of graphene-quantum-dot assembled nanotubes and their SERS function[41]
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