DataVXACS NanoPaper
journal article·2019-07-23

Plasmon-Free Surface-Enhanced Raman Spectroscopy Using Metallic 2D Materials

Xiuju Song, Yan Wang, Fang Zhao, Qiucheng Li, Huy Quang Ta, Mark H. Rümmeli, Christopher G. Tully, Zhenzhu Li, Wan-Jian Yin, Letao Yang, Ki-Bum Lee, Jieun Yang, Ibrahim Bozkurt, Shengwen Liu, Wenjing Zhang, Manish Chhowalla

ACS Nano· Volume 13· Issue 7
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Source abstract

Abstract

Two dimensional (2D) materials-based plasmon-free surface-enhanced Raman scattering (SERS) is an emerging field in nondestructive analysis. However, impeded by the low density of state (DOS), an inferior detection sensitivity is frequently encountered due to the low enhancement factor of most 2D materials. Metallic transition-metal dichalcogenides (TMDs) could be ideal plasmon-free SERS substrates because of their abundant DOS near the Fermi level. However, the absence of controllable synthesis of metallic 2D TMDs has hindered their study as SERS substrates. Here, we realize controllable synthesis of ultrathin metallic 2D niobium disulfide (NbS2) (<2.5 nm) with large domain size (>160 μm). We have explored the SERS performance of as-obtained NbS2, which shows a detection limit down to 10-14 mol·L-1. The enhancement mechanism was studied in depth by density functional theory, which suggested a strong correlation between the SERS performance and DOS near the Fermi level. NbS2 features the most abundant DOS and strongest binding energy with probe molecules as compared with other 2D materials such as graphene, 1T-phase MoS2, and 2H-phase MoS2. The large DOS increases the intermolecular charge transfer probability and thus induces prominent Raman enhancement. To extend the results to practical applications, the resulting NbS2-based plasmon-free SERS substrates were applied for distinguishing different types of red wines.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

Nanomaterials

OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Advanced biosensing and bioanalysis techniques · Nanocluster Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Shenzhen University, Shenzhen 518060, P.R. China

Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, United States

Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, U.K.

Department of Physics, Princeton University, Jadwin Hall, Princeton, New Jersey 08544, United States

Soochow Institute for Energy and Materials InnovationS (SIEMIS), Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou 215006, P.R. China

IFW Dresden, Helmholtz Strasse 20, Dresden 01069, Germany

Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, Zabrze 41-819, Poland

Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States

Funding

National Natural Science Foundation of China · Simons Foundation · Shenzhen Peacock Plan · Educational Commission of Guangdong Province · John Templeton Foundation

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