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Title: 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels
Authors: Tao, Li
Chen, Kun
Chen, Zefeng
Cong, Chunxiao
Qiu, Caiyu
Chen, Jiajie
Wang, Ximiao
Chen, Huanjun
Yu, Ting
Xie, Weiguang
Deng, Shaozhi
Xu, Jian-Bin
Keywords: Science::Chemistry
Issue Date: 2018
Source: Tao, L., Chen, K., Chen, Z., Cong, C., Qiu, C., Chen, J., . . . Xu, J.-B. (2018). 1T′ transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels. Journal of the American Chemical Society, 140(28), 8696-8704. doi:10.1021/jacs.8b02972
Journal: Journal of the American Chemical Society
Abstract: Plasmon-free surface enhanced Raman scattering (SERS) based on the chemical mechanism (CM) is drawing great attention due to its capability for controllable molecular detection. However, in comparison to the conventional noble-metal-based SERS technique driven by plasmonic electromagnetic mechanism (EM), the low sensitivity in the CM-based SERS is the dominant barrier toward its practical applications. Herein, we demonstrate the 1T' transition metal telluride atomic layers (WTe2 and MoTe2) as ultrasensitive platforms for CM-based SERS. The SERS sensitivities of analyte dyes on 1T'-W(Mo)Te2 reach EM-comparable ones and become even greater when it is integrated with a Bragg reflector. In addition, the dye fluorescence signals are efficiently quenched, making the SERS spectra more distinguishable. As a proof of concept, the SERS signals of analyte Rhodamine 6G (R6G) are detectable even with an ultralow concentration of 40 (400) fM on pristine 1T'-W(Mo)Te2, and the corresponding Raman enhancement factor (EF) reaches 1.8 × 109 (1.6 × 108). The limit concentration of detection and the EF of R6G can be further enhanced into 4 (40) fM and 4.4 × 1010 (6.2 × 109), respectively, when 1T'-W(Mo)Te2 is integrated on the Bragg reflector. The strong interaction between the analyte and 1T'-W(Mo)Te2 and the abundant density of states near the Fermi level of the semimetal 1T'-W(Mo)Te2 in combination gives rise to the promising SERS effects by promoting the charge transfer resonance in the analyte-telluride complex.
ISSN: 0002-7863
DOI: 10.1021/jacs.8b02972
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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