Synthesis of self-assembled tubes in direct conjugated porphyrin-gold nanohybrid solution

Dwivedi, Yashashchandra; De Boni, Leonardo; Gonçalves, Pablo José; Zilio, Sérgio Carlos

Synthesis of self-assembled tubes in direct conjugated porphyrin-gold nanohybrid solution

Data

2013

Autores

Dwivedi, Yashashchandra

De Boni, Leonardo

Gonçalves, Pablo José

Zilio, Sérgio Carlos

Resumo

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.

Palavras-chave

Gold nanoparticle, Luminescence quenching, Nanotube, Optical properties, Porphyrin, Self-assembly

Citação

DWIVEDI, Yashashchandra; DE BONI, Leonardo; GONÇALVES, Pablo José; ZILIO, Sérgio Carlos. Synthesis of self-assembled tubes in direct conjugated porphyrin-gold nanohybrid solution. Science of Advanced Materials, Los Angeles, v. 5, p. 295-300, 2013. DOI: 10.1166/sam.2013.1458. Disponível em: https://www.ingentaconnect.com/content/asp/sam/2013/00000005/00000003/art00012. Acesso em: 4 jul. 2024.