دورية أكاديمية
The effects of aggregation on electronic and optical properties of oligothiophene particles.
| العنوان: | The effects of aggregation on electronic and optical properties of oligothiophene particles. |
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| المؤلفون: | Ostrowski DP; Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, USA., Lytwak LA, Mejia ML, Stevenson KJ, Holliday BJ, Vanden Bout DA |
| المصدر: | ACS nano [ACS Nano] 2012 Jun 26; Vol. 6 (6), pp. 5507-13. Date of Electronic Publication: 2012 May 29. |
| نوع المنشور: | Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Chemical Society Country of Publication: United States NLM ID: 101313589 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1936-086X (Electronic) Linking ISSN: 19360851 NLM ISO Abbreviation: ACS Nano Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Washington D.C. : American Chemical Society |
| مواضيع طبية MeSH: | Nanoparticles/*chemistry , Nanoparticles/*ultrastructure , Thiophenes/*chemistry, Electric Conductivity ; Macromolecular Substances/chemistry ; Materials Testing ; Molecular Conformation ; Particle Size ; Refractometry ; Surface Properties |
| مستخلص: | Solution processing of oligothiophene molecules is shown to produce a range of particles with distinct morphologies. Once isolated on a substrate, the optical and electronic properties of individual particles were studied. From polarized scanning confocal microscopy experiments, distinct particles that are identifiable by shape were shown to have similar emission spectra except in regard to the 0-0 vibronic band intensity. This suppression of the 0-0 vibronic band correlates to the amount of energetic disorder present in a weakly coupled H-aggregate. The studied particles ranged from moderate to almost complete suppression of the 0-0 vibronic band when compared to the emission spectrum of the isolated molecule in solution. All particles were found to have a high degree of geometric order (molecular alignment) as observed from the fluorescence dichroism (FD) values of around 0.7-0.8 for all the studied morphologies. The structural and electronic properties of the particles were investigated with Kelvin probe force microscopy (KPFM) to measure the local contact potential (LCP) difference, a quantity that is closely related to the differences in intermolecular charge distribution between the oligothiophene particles. The LCP was found to vary by as much as 70 mV between different oligothiophene particles and a trend was observed that correlated the LCP changes with the amount of energetic disorder present, as signified by the suppression of the 0-0 vibronic peak in the emission spectra. Combined polarized scanning confocal microscopy studies, along with KPFM measurements, help to provide fundamental insights into the role of morphology, molecular packing, and intermolecular charge distributions in oligiothiophene particles. |
| المشرفين على المادة: | 0 (Macromolecular Substances) 0 (Thiophenes) |
| تواريخ الأحداث: | Date Created: 20120518 Date Completed: 20121107 Latest Revision: 20120626 |
| رمز التحديث: | 20240628 |
| DOI: | 10.1021/nn301410j |
| PMID: | 22590975 |
| قاعدة البيانات: | MEDLINE |
Find this issue from the American Chemical Society | تدمد: | 1936-086X |
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| DOI: | 10.1021/nn301410j |