Shin Yukyung, Kim Jayeong, Jang Yujin, Ko Eunji, Lee Nam-Suk, Yoon Seokhyun, Kim Myung Hwa
Department of Chemistry & Nanoscience, Ewha Womans University, Seoul 03760, Korea.
Department of Physics, Ewha Womans University, Seoul 03760, Korea.
Nanomaterials (Basel). 2020 Sep 16;10(9):1847. doi: 10.3390/nano10091847.
Vertically-oriented two-dimensional (2D) tungsten disulfide (WS) nanosheets were successfully grown on a Si substrate at a temperature range between and 550 °C via the direct chemical reaction between WCl and S in the gas phase. The growth process was carefully optimized by adjusting temperature, the locations of reactants and substrate, and carrier gas flow. Additionally, vertically-oriented 2D WS nanosheets with a few layers were tested as a surface-enhanced Raman scattering substrate for detecting rhodamine 6G (R6G) molecules where enhancement occurs from chemical enhancement by charge transfer transition from semiconductor). Raman spectra of R6G molecules adsorbed on vertically-oriented 2D WS nanosheets exhibited strong Raman enhancement effects up to 9.2 times greater than that on the exfoliated WS monolayer flake sample. From our results, we suggest that the WS nanosheets can be an effective surface-enhanced Raman scattering substrate for detecting target molecules.
通过气相中WCl与S之间的直接化学反应，在温度介于[具体温度区间未给出]和550°C之间的Si衬底上成功生长出垂直取向的二维（2D）二硫化钨（WS）纳米片。通过调节温度、反应物和衬底的位置以及载气流量，对生长过程进行了仔细优化。此外，测试了几层垂直取向的2D WS纳米片作为表面增强拉曼散射衬底用于检测罗丹明6G（R6G）分子，其中增强作用源于半导体电荷转移跃迁的化学增强。吸附在垂直取向的2D WS纳米片上的R6G分子的拉曼光谱显示出强烈的拉曼增强效应，比剥落的WS单层薄片样品上的增强效应大9.2倍。根据我们的结果，我们认为WS纳米片可以成为检测目标分子的有效表面增强拉曼散射衬底。
