title: Effect of silver nano particles on the fluorescence quantum yield of Rhodamine 6G determined using dual beam thermal lens method.
abstract: Nano structured noble metals have very important applications in diverse fields as photovoltaics, catalysis, electronic and magnetic devices, etc. Here, we report the application of dual beam thermal lens technique for the determination of the effect of silver sol on the absolute fluorescence quantum yield (FQY) of the laser dye rhodamine 6G. A 532 nm radiation from a diode pumped solid state laser was used as the excitation source. It has been observed that the presence of silver sol decreases the fluorescence quantum efficiency. This is expected to have a very important consequence in enhancing Raman scattering which is an important spectrochemical tool that provides information on molecular structures. We have also observed that the presence of silver sol can enhance the thermal lens signal which makes the detection of the signal easier at any concentration.
authors.affiliation: International School of Photonics, Cochin University of Science and Technology, Cochin 22, Kerala, India. santhi@cusat.ac.in
authors.forename: A
authors.initials: A
authors.lastname: Santhi
authors.forename: M
authors.initials: M
authors.lastname: Umadevi
authors.forename: V
authors.initials: V
authors.lastname: Ramakrishnan
authors.forename: P
authors.initials: P
authors.lastname: Radhakrishnan
authors.forename: V P N
authors.initials: VP
authors.lastname: Nampoori
mesh_terms: D005456:Fluorescent Dyes / Q000494:pharmacology; D007834:Lasers; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods*; D012235:Rhodamines / Q000737:chemistry*; D012542:Scattering, Radiation; D012834:Silver / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013053:Spectrophotometry / Q000295:instrumentation* / Q000379:methods*; D013059:Spectrum Analysis, Raman
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; C026188:rhodamine 6G; D012834:Silver