title: Variations in fluorescence quantum yield of basic fuchsin with silver nanoparticles prepared by femtosecond laser ablation.
abstract: Nano structured noble metals have very important applications in diverse fields such as photovoltaics, catalysis, electronic and magnetic devices, etc. In the present work, the application of dual beam thermal lens technique is employed for the determination of the absolute fluorescence quantum yield of the triaminotriphenylmethane dye, basic fuchsin in the presence of silver sol is studied. Silver sol is prepared by femtosecond laser ablation. It is observed that the presence of silver sol decreases the fluorescence quantum efficiency. The observed results are in line with the conclusion that the reduction in quantum yield in the quenching region is essentially due to the non-radiative relaxation of the absorbed energy. It is also observed that the presence of silver sol enhances the thermal lens signal which makes its detection easier at any concentration.
authors.affiliation: International School of Photonics, Cochin University of Science and Technology, Cochin, Kerala, India. Electronic address: binivibin@gmail.com.
authors.forename: Bini
authors.initials: B
authors.lastname: Pathrose
authors.affiliation: Department of Microbiology, Medical College, Thiruvananthapuram, Kerala, India. Electronic address: hsahira@gmail.com.
authors.forename: H
authors.initials: H
authors.lastname: Sahira
authors.affiliation: International School of Photonics, Cochin University of Science and Technology, Cochin, Kerala, India. Electronic address: vpnnampoori@cusat.ac.in.
authors.forename: V P N
authors.initials: VP
authors.lastname: Nampoori
authors.affiliation: International School of Photonics, Cochin University of Science and Technology, Cochin, Kerala, India. Electronic address: radhak@cusat.ac.in.
authors.forename: P
authors.initials: P
authors.lastname: Radhakrishnan
authors.affiliation: International School of Photonics, Cochin University of Science and Technology, Cochin, Kerala, India; LBS Centre for Science and Technology, Thiruvananthapuram, Kerala, India. Electronic address: mujeebpoovar@gmail.com.
authors.forename: A
authors.initials: A
authors.lastname: Mujeeb
mesh_terms: D001578:Benzopyrans / Q000737:chemistry*; D005453:Fluorescence; D007834:Lasers; D053768:Metal Nanoparticles / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D001578:Benzopyrans; C100026:fuscin; D012834:Silver
keywords: Basic fuchsin; Femtosecond laser; Fluorescence quantum yield; Laser ablation; Silver nanoparticles; Thermal lens spectroscopy