Poster For Mrs Spring 2010
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Poly(3-hexylthiophene) (P3HT) forms nanowires on graphene oxide (GO) and reduced graphene oxide (RGO) surfaces through a crystallization process induced by the graphene sheets. Transmission electron microscopy and atomic force microscopy show that the P3HT nanowires grow from and connect individual RGO monolayers. Raman spectroscopy indicates an interaction between the P3HT and RGO that allows manipulation of the RGO's electrical properties. The composite of P3HT nanowires on RGO forms a supramolecular structure with potential for nano-electronic applications due to improved charge transport over the individual components.
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![Supramolecular Structure of Poly(3-hexylthiophene) on Graphene Nanosheets Non isothermal crystallization Oxidant 100 nm Graphite Oxidant used: Potassium permanganate, Potassium chlorate 1345 1604 1447 1447 1599 1359 1355 1589 1378 AnindarupaChunder, JianhuaLiu, Lei Zhai* Nanoscience Technology Center & Department of Chemistry, University of Central Florida, Orlando FL Solvent used - anisole [P3HT]=0.05mg/mL Polymer Hot Solution at 80oC Cooling Poly(3-hexylthiophene) (P3HT) supramolecular structures are fabricated on P3HT dispersed reduced graphene oxide (RGO) monolayers P3HT is able to disperse RGO in hot anisole/DMF solvents, and forms nanowires on RGO surfaces through a RGO induced crystallization process. The Transmission Electron Microscope (TEM) and Atomic Force Microscope (AFM) investigation of the resultant P3HT/RGO composites shows that P3HT nanowires grow from RGO and connect individual RGO monolayers. The Raman spectroscopy suggests the interaction between P3HT and RGO, allowing the manipulation of the RGO electrical properties. Such bottom-up approach provides interesting graphene based composites for nano-scale electronics. Nanofibrils at RT Width: 10-15 nm Length: > 10 μm Synthesis Oxidation of Pristine Graphite Fabrication of P3HT Nanofibrils in Anisole RGO in anisole RGO in hot P3HT solution Reduction of Graphite Oxide Single RGO sheet in polymer solution (AFM) In-situ Uv-Vis Spectroscopy of P3HT Crystallization Supramolecular Structure of P3HT Nanofibrils on RGO Nanosheets Raman Spectroscopy TEM Image A B B A 40 hrs 10 hrs Absorbance (a.u.) A B D C C D 4 hrs AFM Height Image A B (A) P3HT nanowires in anisole; (B) P3HT with graphene oxide (GO); (C) P3HT with reduced graphene oxide (RGO); (D) UV-Vis absorbance change at 600 nm of the pure P3HT, P3HT with GO and P3HT with RGO suspension during the crystallization GO (A), RGO (B), P3HT nanowires (C), and RGO with P3HT nanowires (D) ,[object Object]](https://image.slidesharecdn.com/posterformrsspring2010-12746306057645-phpapp02/85/Poster-For-Mrs-Spring-2010-1-320.jpg)
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Water Sol P Poster
The document summarizes the electrochemical properties of various metalloporphyrin complexes in non-aqueous media. The authors examined how the central metal ion and porphyrin counteranion affect the redox processes. They identified three groups of complexes based on their electrochemical behavior. Group A complexes undergo three irreversible or quasi-reversible reductions. Group B complexes have more than three reductions due to the metal ions having lower electronegativity. Group C complexes exhibit a reversible metal-based reduction prior to other processes. Overall, the study provides insight into the redox mechanisms and multi-electron transfer processes of these complexes.
new_Effect of Magnetic Fields on Coherent Spectroscopy
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I. The effect of transverse magnetic fields (TMF) on a degenerate two-level system, showing it leads to splitting of absorption peaks. Numerical solutions using Bloch equations are presented.
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Thermally Activated Delayed Fluorescence (TADF)
The document discusses thermally activated delayed fluorescence (TADF) for organic light emitting diodes. It begins with an introduction to TADF and the mechanisms allowing conversion of triplet excitons to light. Key parameters for efficient TADF emitters include a small singlet-triplet energy gap, high photoluminescence quantum yield, and high oscillator strength. Molecular design strategies aim to engineer these parameters, such as introducing strong donor-acceptor motifs or using spiro linkers to separate orbitals. The document concludes that TADF could harvest normally wasted triplet excitons, improving light emission efficiency.
1-s2.0-S1386142514017223-main
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9
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Poster For Mrs Spring 2010
- 2. G band of RGO in the Raman spectra was low frequency shifted by electron donor P3HT which suggests the interaction between RGO and P3HT
- 3. The quasi-isothermal crystallization process monitored by in-situ UV-Vis spectroscopy indicated RGO-induced P3HT nanowire formation
- 4. Low-energy absorption bands at 510, 550, and 600 nm were explained as a combination of a π-π* electronic transition and a strong lattice vibration in P3HT crystalline domainsP3HT nanofibril attached & grown on RGO nanosheets (B)RGO nanosheets and free P3HT nanowire mixture showing no attachment 100 nm Summary - The conductivity of the P3HT-dispersed RGO films is 6.0x10-3 S m-1 while the conductivity of RGO and P3HT films are 103 and 1.2x10-4 S m-1 respectively - Nanowires have better charge mobility compared to that of solution cast P3HT film (0.012 cm2/(Vs) with an on/off ratio of 6.5x104) and therefore the composite promises better optoelectronic properties as compared to the individual component Ref: A. Chunder, J. Liu, L. Zhai; Macromolecular Rapid Communications, 31, 380-384, 2010, Acknowledgement: Dr. Jianhua Liu, AMPAC Facility, NSTC & NSF Career Award