Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 330, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.129357
Keywords
Bio-inspired; SERS; Interface assembly; Interface transfer; Optical sensor
Funding
- National Natural Science Foundation of China [21671081]
- Fundamental Research Funds for the Central Universities [JUSRP51626B]
- Fok Ying Tong Education Foundation [171039]
- Central Laboratory, School of Chemical and Material Engineering, Jiangnan University
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Designing a SERS substrate inspired by insects' compound eyes can greatly enhance Raman signal intensity and enable highly sensitive detection of Hg2+, thereby providing a new insight for achieving highly sensitive Raman detection.
To enhance the intensity of Raman signal from a novel perspective in bio-inspiration, a SERS substrate similar to the insects' compound eyes was designed. The interface assembly and interface transfer of PS spheres were used to fabricate continuous Ag nano-bowls on the Si micro-cones, which avoids the limitation that the traditional method cannot realize the assembly of Ag nano-bowls on the substrate with obviously undulated structure. This bio-inspired structure is an excellent absorber of light, which greatly enhances the SERS signal intensity. The enhancement factor of 3D Ag nano-bowls is 5.5 times than that of 2D Ag nano-bowls on the flat substrate. At the same time, this bio-inspired SERS substrate was applied to the quantitative and qualitative detection of Hg2+, and its detection limit for Hg2+ can reach to 10(-11) M. Adding the bio-inspired concept to the design of the SERS substrate will provide a new insight to realize the highly sensitive Raman detection.
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