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Light trapping induced flexible wrinkled nanocone SERS substrate for highly sensitive explosive detection
بستر SERS nanocone چین خورده انعطاف پذیر ناشی از به دام انداختن نور برای تشخیص مواد منفجره بسیار حساس-2020 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 chargetransfer
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
10−13mol/L, and show a good linear response in the range from 10−8 to 10−13mol/L. Consequently, by
brushing this flexible SERS substrate onto a cloth bag, trace amount of TNT residues with concentration as low as
10-10mol/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. Keywords: Nanocone | Nanowrinkle | Flexible materials | Light trapping | SERS |
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