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Synthesis of Self-Assembled Tubes in Direct Conjugated Porphyrin-Gold Nanohybrid Solution

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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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Keywords: GOLD NANOPARTICLE; LUMINESCENCE QUENCHING; NANOTUBE; OPTICAL PROPERTIES; PORPHYRIN; SELF-ASSEMBLY

Document Type: Research Article

Publication date: March 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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