Strong Photoluminescence Enhancement in Molybdenum Disulfide in Aqueous Media
Strong Photoluminescence Enhancement in Molybdenum Disulfide in Aqueous Media
复制标题
二硫化钼在水介质中的强光致发光增强
DOI：
10.1021/acs.langmuir.2c01601
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Kiriya Daisuke
中科院分区：
文献类型：
--
作者：
Kimura Daisuke;Yotsuya Shotaro;Yoshimura Takeshi;Fujimura Norifumi;Kiriya Daisuke
传统半导体与离子水溶液之间的界面是化学和材料科学中的重要目标。近年来，过渡金属二硫属化合物（TMDC）作为二维层状半导体材料的研究越来越多，其光电性能也得到了广泛的研究。已知一种代表性的TMDC，单层（1L）MoS2，显示直接带隙性质的光致发光（PL）信号，并且PL强度取决于载流子浓度。1L MoS2载波调制的各种方法已被证明可以增强干燥环境中的PL强度。相比之下，在水性环境中的增强是有限的，并且尚未建立设计与水性介质的界面的策略。一个建议的想法是一个含水酸界面，然而，这种方法的PL的增强通常是最小的，约1个数量级。在这项研究中，我们展示了一种方法，以实现强大的PL增强在1L二硫化钼在水介质中，通过将双（三氟甲烷）磺酰基阴离子（TFSI离子）在酸性环境中。在酸性环境中加入TFSI离子后，1L MoS2中的荧光增强因子比其在水中的荧光强度增强100倍以上.分子阴离子是关键因素，因为TFSI离子促进MoS2的氧化。这种阴离子效应是调节水性介质中2D半导体的光电性质所需的额外因素。所提出的想法可能有潜在的应用生化传感器在水的情况下。
The interface between conventional semiconductors and aqueous ionic solutions is an important target in chemistry and materials science. Recently, a wide variety of research has been done on transition-metal dichalcogenides (TMDCs) for use as 2D layered semiconductors, and their optoelectronic properties have been widely explored. One representative TMDC, monolayer (1L) MoS2, is known to show a photoluminescence (PL) signal of a direct band gap nature, and the PL intensity is dependent on the carrier concentration. Various methods of 1L MoS2carrier modulation have been shown to enhance the PL intensity in dry environments. In contrast, enhancement in an aqueous environment is limited, and a strategy to design an interface with aqueous media has not yet been established. One proposed idea was an aqueous acid interface; however, the enhancement of the PL with this method was usually minimal, about 1 order of magnitude. In this study, we demonstrate a method to achieve strong PL enhancement in 1L MoS2in an aqueous media by incorporating bis(trifluoromethane)sulfonyl anion (TFSI–ion) in an acidic environment. With the addition of the TFSI–ion in an acidic environment, the enhancement factor of the PL in 1L MoS2is more than 100 times greater than its PL intensity in water. The molecular anion is the key factor, as the TFSI–ion facilitates the oxidation of MoS2. This anionic effect is the additional factor needed to modulate the optoelectronic properties of 2D semiconductors in aqueous media. The proposed idea could have potential applications for biochemical sensors in aqueous situations.