A spontaneously formed plasmonic-MoTe2 hybrid platform for ultrasensitive Raman enhancement

Cell Reports Physical Science

Kun Chen¹  Ximiao Wang¹  Zhiyong Li²  Runze Zhan³  Yaoqiang Zhou³  Li Tao³  Xiangyu Hou³  Xi Wan⁴  Jian-Bin Xu⁵  Teng Qiu⁶  Hao Li⁷  Yu Zhao⁷  Junling Xu⁷ 

[1] Corresponding author;Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (Ministry of Education), School of Physics, Beijing Institute of Technology, Beijing 100081, China;Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China;Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China;Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong SAR, China;School of Physics, Southeast University, Nanjing 211189, China;State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology and Guangdong Province Key Laboratory of Display Material, Sun Yat-sen University, Guangzhou 510275, China;

关键词: 2D materials;    surface-enhanced Raman scattering;    charge transfer;    phase engineering;    surface activity;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: Development of highly sensitive, stable, and repeatable surface-enhanced Raman scattering (SERS) substrates is crucial for analytical detection, which is a challenge for traditional metallic structures. Here, by exploiting the high surface activity of the 1T′ transition metal telluride, we fabricate high-density gold nanoparticles (AuNPs) that are prepared spontaneously in situ on the 1T′ MoTe2 atomic layers, forming a plasmonic-2D material hybrid SERS substrate. This AuNP formation is unique to the 1T′ phase, which is repressed in 2H MoTe2 with lower surface activity. The hybrid structure generates coupling effects of electromagnetic and chemical enhancements, as well as excellent molecule adsorption, leading to ultrasensitive (4 × 10−17 M) and reproducible detection. Flexible SERS tapes are demonstrated in practical applications. Our approach facilitates ultrasensitive SERS detection by a facile method, as well as an enhanced mechanistic understanding of SERS beyond plasmonic effects.

【 授权许可】

Unknown