Mechanochemical activation of 2D MnPS3 for sub-attomolar sensing

Wenjun Chen (), Jiabao Gui, Xiangchao Weng, Junyang Tan, Junhua Huang, Zhiqiang Lin, Benli Zhao, Lang-Hong Wang, Xin-An Zeng, Changjiu Teng (), Shilong Zhao (), Baofu Ding, Bilu Liu and Hui-Ming Cheng ()
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Wenjun Chen: Foshan University
Jiabao Gui: Foshan University
Xiangchao Weng: Foshan University
Junyang Tan: Tsinghua University
Junhua Huang: Sun Yat-Sen University
Zhiqiang Lin: Chinese Academy of Sciences
Benli Zhao: Foshan University
Lang-Hong Wang: Foshan University
Xin-An Zeng: Foshan University
Changjiu Teng: Foshan University
Shilong Zhao: Foshan University
Baofu Ding: Chinese Academy of Sciences
Bilu Liu: Tsinghua University
Hui-Ming Cheng: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Molecular detection is important in biosensing, food safety, and environmental surveillance. The high biocompatibility, superior mechanical stability, and low cost make plasmon-free surface-enhanced Raman scattering (SERS) a promising sensing technique, the ultrahigh sensitivity of which is urgently pursued for realistic applications. As a proof of concept, we report a mechanochemical strategy, which combines the wrinkling and chemical functionalization, to fabricate a plasmon-free SERS platform based on 2D MnPS3 with a sub-attomolar detection limit. In detail, the formation of wrinkles in 2D MnPS3 enables a SERS substrate of the material to detect trace methylene blue molecules. The mechanism is experimentally revealed that the wrinkled structures contribute to the improvement of light-matter coupling. On this basis, decorating a wrinkled MnPS3 which has absorbed methylene blue with histamine dihydrochloride further lowers the detection limit to 10−19 M. Because the amino groups in histamine dihydrochloride molecules are crosslinkers that create more pathways to promote charge transfer between these substances. This work provides a guidance for the design of SERS sensors with single-molecule-level sensitivity.

Date: 2024
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DOI: 10.1038/s41467-024-54608-0

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