Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 20: Poster session II

MM 20.6: Poster

Tuesday, April 2, 2019, 18:30–20:00, Poster C

photothermal study of RGO-Ag nanowire composite in solid state — •nishaina sahadev and aji anappara — dept. of physics, nit calicut, nit campus p.o, calicut, india

Reduced Graphene Oxide (RGO) have been shown to exhibit excellent light-to-heat transduction owing to its broad-band absorptance (IR-to-UV range of frequencies) and negligible photoluminescence. Similarly silver nanowires also exhibit good photothermal activity. Here, we report a comparative study of the photothermal activity of RGO and its composites with Ag nanowires in solid state. While Ag nanowires has its characteristic plasmon absorption peaks at ~377 and 351 nm, RGO exhibits an absorption peak maxima at ~ 272 nm in the UV range corresponding to the M-point in its electronic band structure. A photo-DSC setup with a UV-visible light source (250-450 nm) was used for carrying out isothermal photocalorimetric measurements on the samples at ~ 25 oC. Upon irradiation, the samples RGO, S1 and S2 (S1 and S2 are composites of RGO and Ag nanowires; with different mass percentages of Ag nanowire) in powder form were found to generate considerable amount of heat. An interesting observation was that the mass-normalized heat output of the composites (S1 and S2) upon light irradiation was higher as compared to RGO possibly resulting from the better light absorption in the composites as compared to RGO alone.