Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 314, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128081
Keywords
Nanocone; Nanowrinkle; Flexible materials; Light trapping; SERS
Funding
- National Natural Science Foundation of China [61601165, 51875165]
- 111 Project [B12019]
- Fundamental Research Funds for the Central Universities [JZ2019HGTB0088]
- China Postdoctoral Science Foundation [2018T110613]
- Anhui Key Project of Research and Development Plan [1704d0802188]
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We reported an ultrasensitive TNT detection method via a novel light trapping induced wrinkled nanocone flexible SERS substrate, which was fabricated by colloidal lithography and oxygen plasma etching on transparent PET film. Especially, a set of nanowrinkles with 50-60 nm was found on the sidewall of nanocone after etching. By coating 30 nm gold film, this flexible SERS substrate provided uniform hot spots, which demonstrated high reproducibility and sensitivity. 4-ATP molecules based Meisenheimer complex, which is a well-known charge-transfer interaction between electron-poor TNT and electron-rich amino group, was taken to detect ultra-low concentration of TNT explosive. The Raman signal of TNT was significantly enhanced by charge-transfer, light trapping effect and coupled electromagnetic field. The detection sensitivity of TNT molecules was as low as 10(-13)mol/L, and show a good linear response in the range from 10(-8) to 10(-13)mol/L. Consequently, by brushing this flexible SERS substrate onto a cloth bag, trace amount of TNT residues with concentration as low as 10(-10)mol/L can be easily analyzed. It is believed that the proposed highly sensitive and uniform flexible substrate provides a significant solution for trace analysis of TNT residue in criminal forensic, military and security check.
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