胶体WS2纳米片的室温微区光致发光研究
Room Temperature Micro-Photoluminescence Studies of Colloidal WS2 Nanosheets
摘要：
湿化学合成准二维（2D）过渡金属二硫属化物（TMD）已成为这些材料的直接溶液处理的有前途的方法。然而，由于典型的非发光合成产物，胶体TMD的光致发光特性几乎未被探索。在这项工作中，我们首次展示了在320 °C下由WCl6和元素硫在油酸和油胺中合成的精细的胶体WS2纳米片的室温显微光致发光。观察到单层和多层光致发光，揭示了剥离的TMD单层的可比特性，并支持高质量的胶体WS2纳米片。此外，一个有前途的长期空气稳定性的胶体WS2纳米片被发现和控制的光降解的结构下激光激发被确定为一个挑战，进一步推进纳米片单层。我们的研究结果使胶体TMD易于合成和非常有前途的二维半导体与传统制造的MEMS TMD的光学性能完全竞争。
英文摘要：
Wet-chemical syntheses for quasi two-dimensional (2D) transition metal dichalcogenides (TMDs) have emerged as promising methods for straightforward solution-processing of these materials. However, photoluminescence properties of colloidal TMDs are virtually unexplored due to the typically non-emitting synthesis products. In this work, we demonstrate room temperature micro-photoluminescence of delicate ultrathin colloidal WS2 nanosheets synthesized from WCl6 and elemental sulfur in oleic acid and oleylamine at 320 °C for the first time. Both, mono- and multilayer photoluminescence are observed, revealing comparable characteristics to exfoliated TMD monolayers and underpinning the high quality of colloidal WS2 nanosheets. In addition, a promising long-term air-stability of colloidal WS2 nanosheets is found and the control of photodegradation of the structures under laser excitation is identified as a challenge for further advancing nanosheet monolayers. Our results render colloidal TMDs as easily synthesized and highly promising 2D semiconductors with optical properties fully competitive with conventionally fabricated ultrathin TMDs.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
