AVS2011 Session BN-TuP: Biofabrication and Novel Devices Poster Session
Tuesday, November 1, 2011 6:00 PM in Room East Exhibit Hall
Tuesday Evening
Time Period TuP Sessions | Topic BN Sessions | Time Periods | Topics | AVS2011 Schedule
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BN-TuP-1 Photoluminescence Characterization of Polythiophene Films Incorporated with Highly-Functional Molecules Such as Metallophthalocyanines
Hiroaki Kobe, Kazumasa Onaka, Hitoshi Kato, Susumu Takemura, Tomoyasu Hiramatsu, Kazuhiro Shimada, Kazunori Matsui (Kanto Gakuin University, Japan) Conducting polymer polythiophene (PT) films incorporated with highly-functional molecules such as phthalocyanines with different center metals were synthesized and characterized by x-ray photoelectron spectroscopy (XPS) measurements, photolumimescence measurements (PL) and time correlated single photon counting (TCSPC) measurements in order to obtain fundamental photoluminescence properties of various PT-phthalocyanine complexes prepared by different solvents. The electrochemical polymerization was performed in acetonitrile containing thiophene monomer and (ET)4NBF4 as a supporting electrolyte and the polymerization on an indium tin oxide (ITO) was conducted by applying positive voltage to the anode. The dopant molecules were iron phtalocyanine (FePc), copper phtalocyanine (CuPc) magnesium phtalocyanine (MgPc), lithium phtalocyanine (Li2Pc) and cobalt phtalocyanine (CoPc). Those molecules were doped in the polymer film by the diffusion method. The solvents used in the doping process were acetonitrile and toluene. At first, it was confirmed by XPS measurements that the metallophthalocyanines were introduced in the PT films. In the photoluminescence measurement, emission peaks were different in intensity and wavelength according to the additional dopant molecules. Those peaks were influenced by Soret and Q bands. The solvent used in the doping process also influenced the emission characteristics. In the case of CuPc using acetonitrile as a solvent, emission peaks which originated from Soret and Q bands were observed in the photoluminescence emission spectrum. On the other hand, emission peaks only due to Q band were observed in the cases of FePc, MgPc, Li2Pc and CoPc. Using toluene as a solvent drastically changed the emission characteristics. In the case of FePc, Li2Pc and CoPc, the emission peaks only due to Soret band were observed. As for CuPc, an emission peak due to Soret band was dominated. In the TCSPC measurements, it was confirmed that the number of life time components fitted to the decay curve ranged from 3 to 5 with several nanoseconds to several hundreds of nanoseconds. The life time and the number of components depended on the center metals of the doped phthalocyanine and the solvent used in the doping process. The present work clarified that the photoluminescence emission peak position, intensity and life time were varied by solvents and center metals of phthalocyanines. |
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BN-TuP-3 Towards F1-ATPsynthase Based Hybrid Nanobiodevice Fabrication
Jenifer K. Settle, Mark L. Richter, Cindy L. Berrie (University of Kansas) Incorporation of biomolecules into nanoscale devices, termed nanobiodevices, requires control over biomolecule placement within the device. Nonspecific adsorption of the tiny molecular motor, F1-ATPsynthase (ATPase), results in a variety of protein orientations on the surface. To improve the functionality of the immobilized protein, only one orientation (gamma unit upright) is desired. Therefore, controlling orientation is also imperative in increasing the number of functional molecules. Several techniques have been utilized to study and control this adsorption process. Atomic force microscopy was used to graft a dithiol into a resist matrix monolayer, exposing a thiol group. Through maleimide chemistry, a maleimide-nitriloacetic acid (NTA) group can be attached to the terminal end of the dithiol pattern. NTA will coordinate with nickel ions, which then coordinates with the histidine tag on the ATPase, thus controlling orientation. This process has also been studied via surface plasmon resonance. By coordinating these efforts with nanoelectrode construction, a functional nanobiodevice may be engineered. |