7 March 2014 Raman gas sensing of modified Ag nanoparticle SERS
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Recent progress in modified Surface Enhanced Raman Scattering (SERS) using Ag nanoparticles makes them promising optical technique for direct gas sensing of interest. However, SERS has been shown to provide sub ppb level detection of the compounds in the vapor phase. The major problem with the sensitivity scaling-up was in the development of fabrication technology for stability and reproducibility of SERS substrates. We report an optimization of 1-propanethiol coated multiple Ag nanoparticle layers on SiO2 substrate as well as new records of real-time, simultaneous vapor phase detection of toluene and 1-2 dichlorobenzene by the radiation of fiber optic coupled 785 nm diode laser and spectrograph. Multiple depositions of Ag NPs were loaded on SiO2 and soaked in 1-propanethiol solution for 24 hours to modify the surface into hydrophobic due to the characteristics of vapor phase of our interests. Raman bands at 1003 cm-1 and 1130 cm-1 for toluene and 12DCB, respectively were compared to 1089 cm-1 and each gas concentration in 1000 mL flask were calculated as a function of each vapor phase ratio. The saturation of toluene and 12DCB were limited only by 800 ppm and the detectable range was 0.6-800 ppm.
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NoSoung Myoung, NoSoung Myoung, Hyung Keun Yoo, Hyung Keun Yoo, In-Wook Hwang, In-Wook Hwang, "Raman gas sensing of modified Ag nanoparticle SERS", Proc. SPIE 8969, Synthesis and Photonics of Nanoscale Materials XI, 89690S (7 March 2014); doi: 10.1117/12.2038984; https://doi.org/10.1117/12.2038984

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