Modulation of Photophysics of Selected Small Molecules by Porous Gold Nanoparticles

Nag, Tarak Nath (2014) Modulation of Photophysics of Selected Small Molecules by Porous Gold Nanoparticles. Masters thesis, Indian Institute of Science Education and Research Kolkata.

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Porous Au NPs were obtained from alloy NPs of Au and Ag by dealloying with dilute HNO₃. Au/Ag alloy NPs were synthesized via reduction of a mixture of HAuCl₄ and AgNO₃ by sodium borohydride in the presence of sodium citrate as a capping agent in aqueous medium. The plasmon absorption band of Ag/Au NPs shifts linearly to the red with increase in Au content. Comparison of the absorption spectrum of the synthesised porous NPs with those of the control NPs concludes that the NPs produced are indeed alloys and not coreshell composites. The porous NPs were used as a host for different molecules. The emission quantum yield of the laser dye fluorescein is found to increase profusely on treatment with porous Au NPs. Moreover, effect on the ground and excited state tautomerization of 2,2´- bipyridine-3,3´-diol molecule [BP(OH)₂] was studied in the confined nanocavities of the porous NPs by steady state and time resolved fluorescence spectroscopy.

Item Type: Thesis (Masters)
Additional Information: Supervisor: Dr. Pradipta Purkayastha
Uncontrolled Keywords: ESIPT; Excited State Intramolecular Proton Transfer; Gold Nanoparticles; Modulation; Nanoparticles; Photophysics; Small Molecules; Porous Gold Nanoparticles
Subjects: Q Science > QD Chemistry
Divisions: Department of Chemical Sciences
Depositing User: IISER Kolkata Librarian
Date Deposited: 16 Jan 2015 11:48
Last Modified: 16 Jan 2015 11:48

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