کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1441622 1509419 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optoelectronic properties of RNA–polyaniline–dendritic gold nanobiocomposite
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Optoelectronic properties of RNA–polyaniline–dendritic gold nanobiocomposite
چکیده انگلیسی

The in situ reduction of Au+++ by aniline in the presence of RNA produces dendritic Au nanoparticles (AuNP) with the concomitant formation of doped polyaniline (PANI). FT-IR spectra indicate that the dendritic AuNPs are stabilized from the complexation of nitrogen atoms of quinonoid structure of PANI with the adsorbed Au+++ on it. CD spectrum indicates a small distortion of RNA ‘A’ helix toward ‘B’ helix. RNA–PANI–Au nanocomposite shows emission peak at 408 nm with an additional peak at 579 nm for the Forster resonance energy transfer (FRET) of PANI excitons to surface plasmon band of Au nanocrystals. The dendritic RNA–PANI–Au nanocomposite has three orders higher dc-conductivity compared to the spherical PANI–Au composite. Impedance data suggest that the system behaves as an equivalent parallel resistance–capacitance (R–C) circuit. The frequency dependency of ac-conductivity indicates three regions of conduction: at low frequency predominantly intrachain conduction by polarons of doped PANI, at medium frequency hopping of polarons through RNA and AuNP along with the intra-chain conduction and at very high frequency the conductivity is predominantly interchain due to localized hopping.

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► In situ synthesis of dendritic AuNP and polyaniline in the presence of RNA.
► RNA–PANI–Au nanocomposites show FRET emission peak.
► 3 order higher dc-conductivity in RNA–PANI–Au nanocomposite than PANI–Au composite.
► The system can be represented by an equivalent parallel R–C circuit.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 162, Issues 11–12, July 2012, Pages 904–911
نویسندگان
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