Synthesis of Self-Assembled Tubes in Direct Conjugated Porphyrin-Gold Nanohybrid Solution
We report on the formation of self-assembled meso-tetrakis (p-sulfonatofenyl) porphyrin (H2 TPPS4– 4) tubes stabilized by gold nanoparticles (NPs) in basic solution and on their spectroscopic chareterization. The role of the gold NPs in the aggregation dynamics of free-base sulfonated porphyrin (H2TPPS4– 4) is also investigated. The direct conjugation of the gold NPs to the H2TPPS4 molecule quenches the fluorescence intensity, while absorption peaks are blue-shifted, indicating predominant H-type aggregation. It is observed that porphyrin molecules adsorbed on the surface of the gold NP interact and form tubes of maximum diameter ∼1.5 μm and length >100 μm. Steady-state and time-resolved spectroscopic techniques confirm nonradiative energy transfer from porphyrin to gold NP.
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Document Type: Research Article
Publication date: March 1, 2013
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