1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels
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...
| Main Authors: | , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/139263 |
| _version_ | 1811676891563687936 |
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| author | 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 |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences 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 |
| author_sort | Tao, Li |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T02:28:41Z |
| format | Journal Article |
| id | ntu-10356/139263 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:28:41Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1392632020-05-18T07:26:42Z 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels 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 School of Physical and Mathematical Sciences Science::Chemistry Dyes and Pigments Charge Transfer 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. 2020-05-18T07:26:42Z 2020-05-18T07:26:42Z 2018 Journal Article 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 0002-7863 https://hdl.handle.net/10356/139263 10.1021/jacs.8b02972 29927248 2-s2.0-85049243042 28 140 8696 8704 en Journal of the American Chemical Society © 2018 American Chemical Society. All rights reserved. |
| spellingShingle | Science::Chemistry Dyes and Pigments Charge Transfer 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 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels |
| title | 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels |
| title_full | 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels |
| title_fullStr | 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels |
| title_full_unstemmed | 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels |
| title_short | 1T' transition metal telluride atomic layers for plasmon-free SERS at femtomolar levels |
| title_sort | 1t transition metal telluride atomic layers for plasmon free sers at femtomolar levels |
| topic | Science::Chemistry Dyes and Pigments Charge Transfer |
| url | https://hdl.handle.net/10356/139263 |
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