Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 36, Pages 31102-31110Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08818
Keywords
SERS; on-demand substrate; plasmon resonance; particle-on-film; pesticide residue
Funding
- National Natural Science Foundation of China [11574078, 11274107]
- Foundation for the authors of National Excellent Doctoral Dissertation of China [201318]
- Natural Science Foundation of Hunan Province [2015JJ1008]
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Highly sensitive and low-cost surface-enhanced Raman scattering (SERS) substrates are essential for practical applications of SERS. In this work, we report an extremely simple but effective approach to achieve sensitive SERS detection of molecules (down to 10(-10) M) by using a particle/molecule/film sandwich configuration. Compared to conventional SERS substrates which are preprepared to absorb analyte molecules for detection, the proposed sandwich configuration is achieved by postassembling a flexible transparent gel tape embedded with plasmonic nanoparticles onto an Au film decorated with to-be-detected analyte molecules. In such a configuration, the individual plasmonic gel tape and Au film have low or no SERS activity but the final assembled sandwich structure shows strong SERS signal due to the formation of numerous hot spots at the particle film interface, where the analyte molecules themselves serve as both spacer and signal probes. Because of its simple configuration, we demonstrate that the proposed SERS substrate can be obtained over a large area with extremely low cost. Particularly, because of the on-demand nature and the flexibility, such a postassembly strategy provides an ideal solution to detect the pesticide residue on fruit surfaces with significantly enhanced sensitivity.
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