[논문]Detection of Explosives by SERS Platform Using Metal Nanogap Substrates

Adhikari, Samir; Ampadu, Emmanuel K.; Kim, Minjun; Noh, Daegwon; Oh, Eunsoon; Lee, Donghan

doi:10.3390/s21165567

[해외논문] Detection of Explosives by SERS Platform Using Metal Nanogap Substrates 원문보기

Sensors, v.21 no.16, 2021년, pp.5567 -

Adhikari, Samir , Ampadu, Emmanuel K. , Kim, Minjun , Noh, Daegwon , Oh, Eunsoon , Lee, Donghan

Abstract ▼ AI-Helper

Detecting trace amounts of explosives to ensure personal safety is important, and this is possible by using laser-based spectroscopy techniques. We performed surface-enhanced Raman scattering (SERS) using plasmonic nanogap substrates for the solution phase detection of some nitro-based compounds, taking advantage of the hot spot at the nanogap. An excitation wavelength of 785 nm with an incident power of as low as ≈0.1 mW was used to excite the nanogap substrates. Since both RDX and PETN cannot be dissolved in water, acetone was used as a solvent. TNT was dissolved in water as well as in hexane. The main SERS peaks of TNT, RDX, and PETN were clearly observed down to the order of picomolar concentration. The variations in SERS spectra observed from different explosives can be useful in distinguishing and identifying different nitro-based compounds. This result indicates that our nanogap substrates offer an effective approach for explosives identification.

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