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Findings in the Area of Biological Pigments Reported from Purdue University (Understanding Photophysical Interactions of Semiconducting Carbon...

July 9, 2014

Findings in the Area of Biological Pigments Reported from Purdue University (Understanding Photophysical Interactions of Semiconducting Carbon Nanotubes with Porphyrin Chromophores)

By a News Reporter-Staff News Editor at Biotech Week -- Data detailed on Biological Factors have been presented. According to news reporting originating from West Lafayette, Indiana, by NewsRx correspondents, research stated, "Donor acceptor complexes of porphyrins and semiconducting single-walled carbon nanotubes (SWCNTs) are noncovalently assembled using oligonucleotide DNA, and their photophysical interactions are studied for light-harvesting. Five cationic 5,10,15,20-tetrakis(N-methylpyridynium-4-yl)porphyrins with a free-base (H(2)T4) or metal ions at the core (MT4, M = zn(2+), pt(2+), pd(2+), and Cu2+) are explored as donor chromophores as they exhibit species-unique optical signatures, such as fluorescence, phosphorescence, or both."

Our news editors obtained a quote from the research from Purdue University, "These porphyrins are examined for their abilities to interact with semiconducting carbon nanotubes after photoexcitation. We find that carbon nanotubes efficiently quench the emission properties of porphyrins via charge transfer, which is confirmed by the quenching of singlet oxygen emission generated by porphyrins. Phosphorescence lifetime measurements reveal that the lifetime in the triplet states is largely constant in porphyrins interacting with both DNA alone and DNA-coated SWCNTs, suggesting that photoexcited electrons are transferred to carbon nanotubes from the low-lying singlet state before an intersystem crossing to the triplet state."

According to the news editors, the research concluded: "We demonstrate that the DNA-assembled porphyrin-SWCNT complexes in a photoelectrochemical cell produce stable anodic photocurrents with a conversion efficiency of approximately 1.5%."

For more information on this research see: Understanding Photophysical Interactions of Semiconducting Carbon Nanotubes with Porphyrin Chromophores. Journal of Physical Chemistry C, 2014;118(22):11612-11619. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Journal of Physical Chemistry C -

The news editors report that additional information may be obtained by contacting H.Y. Zhang, Purdue University, Dept. of Chem, West Lafayette, IN 47907, United States. Additional authors for this research include M.A. Bork, K.J. Riedy, D.R. McMillin and J.H. Choi (see also Biological Factors).

Keywords for this news article include: Indiana, Fullerenes, Porphyrins, United States, West Lafayette, Nanotechnology, Carbon Nanotubes, Biological Factors, Biological Pigments, Emerging Technologies, North and Central America

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Source: Biotech Week

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