A novel sensitive and stable surface enhanced Raman scattering substrate based on a MoS2 quantum dot/reduced graphene oxide hybrid system
A novel sensitive and stable surface enhanced Raman scattering substrate based on a MoS2 quantum dot/reduced graphene oxide hybrid system
复制标题
一种基于MoS2量子点/还原氧化石墨烯混合系统的新型灵敏稳定的表面增强拉曼散射基底
DOI：
10.1039/c8tc05151h
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发表时间：
2018
影响因子：
6.4
通讯作者：
Wang Xiufang
中科院分区：
文献类型：
--
作者：
Wu Di;Chen Jianli;Ruan Yaner;Sun Kai;Zhang Kehua;Xie Wenjie;Xie Fazhi;Zhao Xiaoli;Wang Xiufang
采用水热法合成了MoS2量子点/还原氧化石墨烯（MoS2 QD/rGO）纳米复合材料。首次将MoS2 QD/rGO复合材料作为高灵敏度和稳定的表面增强拉曼散射（SERS）衬底用于检测痕量分子物种。罗丹明6G （R6G）的最低检测限（LOD）低至1 × 10−9 M，最大增强因子（EF）可达1.20 × 107，是非贵金属SERS材料中最好的。在实际应用中，MoS2 QD/rGO SERS底物也被用于检测去离子水和河水中的亚甲基蓝（MB）。在河水中获得了LOD (1 × 10−8 M)，证明了多分子检测的高可行性和化学和生物分子检测的巨大潜力。研究了MoS2 QD/rGO SERS衬底的增强机理，SERS信号的大幅增强是由于具有小尺寸超薄切片的1t相MoS2 QD与有机分子的界面处形成了电荷转移（CT）态。还原氧化石墨烯的化学增强也有助于SERS增强。该研究为设计基于二硫化钼量子点的新型SERS衬底开辟了新的途径。
A MoS2 quantum dot/reduced graphene oxide (MoS2 QD/rGO) nanocomposite has been synthesized by a simple hydrothermal approach. For the first time, the MoS2 QD/rGO composite is used as a highly sensitive and stable surface enhanced Raman scattering (SERS) substrate to detect trace amounts of molecular species. The lowest detection limit (LOD) for rhodamine 6G (R6G) is as low as 1 × 10−9 M with the maximum enhancement factor (EF) of up to 1.20 × 107, which is the best among the non-noble metal SERS materials. For practical applications, the MoS2 QD/rGO SERS substrate is also used to detect methylene blue (MB) in deionized water and river water. The LOD (1 × 10−8 M) is obtained in river water, which demonstrates the high feasibility for multi-molecule detection and vast potential ability for the detection of chemical and biological molecules. The enhancement mechanism of the MoS2 QD/rGO SERS substrate is studied, and the large enhancement of the SERS signal is due to the charge transfer (CT) state formed at the interface of the 1T-phase MoS2 QDs with small size and ultrathin slices and organic molecules. The chemical enhancement of rGO also contributes to the SERS enhancement. The study paves a new way for designing a novel MoS2 QD-based SERS substrate.