Self-cleaning SERS sensor based on flexible Ni_(3)S_(2)/MoS_(2)@Ag@PDMS composites for label-free multiplex volatile organic compounds detection  

作　　者：Xinyue Song Yongzheng Zhang Xiaohui Ren Dongyan Tang Xuelin Zhang Xin Li 

机构地区：[1]MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,School of Chemistry and Chemical Engineering,State Key Lab of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China [2]College of Textile and Clothing,Yancheng Institute of Technology,Yancheng 224051,China [3]MEMS Center,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Nano Research》2024年第6期5529-5539,共11页纳米研究（英文版）

基　　金：the financial support by State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology)(No.2022TS19);Funding for School-level Research Projects of Yancheng Institute of Technology(No.xjr2021055).

摘　　要：Flexible self-cleaning surface-enhanced Raman scattering(SERS)sensors are highly desirable for the detection of various environmental pollutants,including volatile organic compounds(VOCs).However,achieving sensitive detection without labeling and ensuring efficient cyclic use remain significant challenges.Herein,we introduce a direct approach to create a versatile Ni_(3)S_(2)/MoS_(2)@Ag@PDMS(PDMS=polydimethylsiloxane)composite SERS substrate using chemical vapor deposition technology.The produced substrate shows outstanding performance,offering extremely low detection sensitivity(1.0×10^(−12)M 4-aminobenzenethiol)and high enhancement factors(approximately 107).The interactions between the rod-shaped Ni_(3)S_(2)/MoS_(2)@Ag heterostructure and the molecules facilitate the transfer of charge,resulting in an increased electric field enhancement of the exciton resonance.This has the dual benefit of providing a self-cleaning effect and enhancing SERS efficiency.Importantly,the substrate enables sensitive detection of VOCs gas molecules without the need for labels,achieving a minimum detectable concentration as low as 1 ppm for o-dichlorobenzene,due to the preconcentration effect of PDMS.Theoretical calculations further explain the combined effect of electromagnetic and chemical enhancement in this composite substrate.By utilizing the developed visual SERS barcode,quick multiple detection and analysis of mixtures can be accomplished.This flexible and versatile SERS technique has significant potential for on-site detection and analysis of environmental pollutants,opening the doors for the development of a wearable in-situ SERS sensing platform.

关 键 词：surface-enhanced Raman scattering(SERS) quantitative detection recyclable detection volatile organic compounds(VOCs) chemical vapor deposition(CVD) 

分 类 号：O65[理学—分析化学]