کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6492948 | 43929 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Organic nanoparticles of an extended Ï-conjugated styryl dye: Modulation of fluorescence peak energy and intensity in the near-infrared (NIR) region
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Organic nanoparticles of an extended Ï-conjugated styryl dye: Modulation of fluorescence peak energy and intensity in the near-infrared (NIR) region Organic nanoparticles of an extended Ï-conjugated styryl dye: Modulation of fluorescence peak energy and intensity in the near-infrared (NIR) region](/preview/png/6492948.png)
چکیده انگلیسی
Tuning the near-infrared (NIR) emission of organic nanomaterials is of great interest due to possible use in biosensing and imaging based on the biological window ranged in 650-900Â nm. In this study, we report NIR fluorescent organic nanoparticles prepared on the basis of ion association between an extended Ï-conjugated Styryl-9 cation and tetrakis(4-fluorophenyl)borate (TFPB) anion. Binding of Styryl-9 with TFPB results in the prominent appearance of an absorption band that can be assigned to a non-fluorescent H-aggregate, which is revealed by simultaneous deconvolution of both UV-vis absorption and fluorescence excitation spectra, and supported by quantum chemical calculations. Emission is observed in the NIR region from the nanoparticles, but is reduced by the presence of the H-aggregates. To mitigate the H-aggregation occurred inside the nanoparticle, photochemically-inert, bulky tetraphenylphosphonium cation (co-cation) is concurrently incorporated (co-doped), resulting in the disappearance of the relevant H-aggregates and thereby yielding controllable fluorescence peak energy and intensity in the NIR region. We believe that such methodology for synthesizing ion-based organic nanoparticles with tunable emission will open an avenue in the development of new types of NIR fluorescent nanomaterials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 330, 1 November 2016, Pages 140-149
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 330, 1 November 2016, Pages 140-149
نویسندگان
Hiroshi Yao, Tomohito Funada,