@article{7aabcb1a416641b183362b59e085feaf,
title = "Wafer-Scale 2H-MoS2 Monolayer for High Surface-enhanced Raman Scattering Performance: Charge-Transfer Coupled with Molecule Resonance",
abstract = "The surface-enhanced Raman scattering (SERS) as a novel and efficient analytic technique to probe molecules has attracted tremendous attention. Semiconducting substrates have been widely investigated for their applications into SERS because of their easy integration with electronic devices. In this work, a wafer-scale semiconducting MoS2 monolayer (2H-MoS2-ML) without additional treatment is used as the SERS substrate, which shows the naturally formed MoS2 ML has excellent chemical stability, high uniformity, and high sensitivity. It is found that the detection concentration limit can reach 1 × 10−8 m and the enhancement factor is about 4.5 × 106 for the rhodamine 6G (R6G) under a 532 nm excitation laser, which is the highest SERS performance observed on 2H-MoS2-ML up to now. The experimental and computational studies reveal that the photo-enhanced charge transfer coupled with molecule resonance contribute to remarkable SERS. In addition to R6G, 2H-MoS2-ML shows good SERS signals on the detection of amaranth and crystal violet too. The findings not only provide an insightful understanding of the mechanism for the improved SERS performance of semiconducting transition-metal dichalcogenides (TMDs) MLs, but are helpful for the design of novel SERS substrates. It is expected that the wafer-scale TMDs may find practical applications in SERS.",
keywords = "charge transfer, molecule resonance, MoS monolayer, SERS, wafer scale",
author = "Keyu An and Mingpeng Chen and Bingchen He and Haoqiang Ai and Wei Wang and Zhihong Zhang and Zhongbin Pan and Shi Chen and Ip, {Weng Fai} and Lo, {Kin Ho} and Jianwei Chai and Shijie Wang and Ming Yang and Shuangpeng Wang and Hui Pan",
note = "Funding Information: This work was supported by the Science and Technology Development Fund (FDCT), Macau SAR (0081/2019/AMJ, 0125/2018/A3, 0102/2019/A2, 0154/2019/A3, and 0033/2019/AMJ), and Multi‐Year Research Grants (MYRG2020‐00207‐IAPME) from the University of Macau. M.Y. thanks the funding support from the Hong Kong Polytechnic University (1‐BE47 and ZE2F). The DFT calculations were performed at High‐Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at University of Macau. The computational resources were also provided by LvLiang Cloud Computing Center of China, and the calculations were performed on TianHe‐2. Funding Information: This work was supported by the Science and Technology Development Fund (FDCT), Macau SAR (0081/2019/AMJ, 0125/2018/A3, 0102/2019/A2, 0154/2019/A3, and 0033/2019/AMJ), and Multi-Year Research Grants (MYRG2020-00207-IAPME) from the University of Macau. M.Y. thanks the funding support from the Hong Kong Polytechnic University (1-BE47 and ZE2F). The DFT calculations were performed at High-Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at University of Macau. The computational resources were also provided by LvLiang Cloud Computing Center of China, and the calculations were performed on TianHe-2. Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",
year = "2022",
month = apr,
doi = "10.1002/admt.202200217",
language = "English",
volume = "7",
journal = "Advanced Materials Technologies",
issn = "2365-709X",
publisher = "Wiley-Blackwell",
number = "8",
}