Abstract
In this paper, a new method for fabrication of surface enhanced Raman spectroscopy (SERS) substrates by atmospheric pressure plasma jet (APPJ) has been introduced. Arc free cold plasma is generated at atmospheric pressure by using atmospheric pressure plasma jet system with 120 W and 200 W RF power and 3 L/min and 5 L/min argon flow. SERS substrates are prepared by two-step treatment process. In first step, PMMA substrates are roughened by 15 min plasma treatment using APPJ and in second step, spin coated Ag/GO suspension (on roughened PMMA substrates) is again treated with APPJ for 1 min. Treated PMMA samples have been characterized by AFM and XPS to observe the morphology, roughness and the chemical changes on surface. Variation of the roughness with the variation of vertical distance has also been analysed. Treated spin coated Ag/GO samples are characterized by Raman and FESEM to observe the surface enhanced Raman spectra and the morphological changes, respectively. Plasma jet coming out form APPJ system has also been characterized by optical emission spectroscopy to identify the various species in the plasma jet and for electron energy measurement. The gas temperature of the plasma jet has also been measured.
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