Au@MoS 2 @Au Hierarchical Nanostructures for High-Sensitivity and Recyclable SERS Device
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ORIGINAL ARTICLE
Au@MoS2@Au Hierarchical Nanostructures for High-Sensitivity and Recyclable SERS Device Shaohui Guo 1,2 & Xingang Ren 3 & Xuanhua Li 1,2 Received: 16 September 2019 / Accepted: 11 November 2019 # Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract The surface-enhanced Raman scattering (SERS) is widely used in chemical analysis and environmental monitoring. Herein, the Au@MoS2@Au three core–shell hierarchical architecture is designed and synthesized through a hydrothermal method and spray process for a high-sensitivity Raman sensor. The enhanced Raman signals achieved in the hierarchical nanostructure are attributed to the two aspects. One is the local electromagnetic field from Au nanoparticles (NPs), including the surface satellites Au NPs and the core Au NPs, and the other is the chemical enhancement from MoS2 nanosheets. As a result, a detection limit of the probe molecule (RhB) as low as 10−10 M is obtained via using this hierarchical Raman substrate. In addition, the hierarchical Au@MoS2@Au Raman substrate can be recycled utilized because of MoS2 photocatalytic ability. The unique Au@MoS2@Au three core–shell nanostructure shows momentous potential to realize a SERS substrate with high-sensitivity and recyclable property. Keywords Surface-enhanced Raman scattering . Au . MoS2 . Core-shell
Introduction Surface-enhanced Raman scattering spectrum (SERS), facilitating detection of molecules with ultrahigh sensitivity, has been considered as one of the most powerful analytical tools [1–6]. At present, most research mainly focuses on the design of rational methods for synthesizing specific sizes, shapes, and new materials [7–11]. Among these methods, hierarchical nanostructures with optimized shape and structure, assemblies
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11468-019-01090-w) contains supplementary material, which is available to authorized users. * Xuanhua Li [email protected] 1
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
2
Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene (NPU), Xi’an 710072, China
3
Key Laboratory of Intelligent Computing & Signal Processing, Ministry of Education, Anhui University, Hefei 230039, China
using nanoparticles (NPs), nanorods, and nanosheets as building blocks, have received great interest [12–17]. Generally, noble metal NPs, such as Au NPs and Ag NPs, are used as SERS substrate materials. Recently, twodimensional (2D) layered transition metal dichalcogenides material with unique electrical and optical properties, such as molybdenum disulfide (MoS2), are also utilized for SERS substrate materials [18–23]. SERS enhancement mainly includes electromagnetic enhancement induced by noble metal nanostructures and chemical enhancement produced by nonmetal materials [24–27]. To ob
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