scholarly journals Direct x-ray detection with conjugated polymer devices

2007 ◽  
Vol 91 (3) ◽  
pp. 033509 ◽  
Author(s):  
F. A. Boroumand ◽  
M. Zhu ◽  
A. B. Dalton ◽  
J. L. Keddie ◽  
P. J. Sellin ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
X Ray ◽  
Polymer Devices

scholarly journals Nanotesla magnetoresistance in π-conjugated polymer devices

2017 ◽  
Vol 95 (24) ◽  
Author(s):  
Philippe Klemm ◽  
Sebastian Bange ◽  
Agnes Pöllmann ◽  
Christoph Boehme ◽  
John M. Lupton
Keyword(s):  
Conjugated Polymer ◽  
Polymer Devices

The Control of Electronic States Spreading Outside the Conjugated Polymer Surface

2006 ◽  
Vol 965 ◽  
Author(s):  
Xiao Tao Hao ◽  
Takuya Hosokai ◽  
Noritaka Mitsuo ◽  
Satoshi Kera ◽  
Kazuyuki Sakamoto ◽  
...  
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
Conjugated Polymer ◽  
Polymer Surface ◽  
Electronic States ◽  
Penning Ionization ◽  
X Ray ◽  
Molecular Ordering ◽  
X Ray Absorption

ABSTRACTThe surface electronic structures of conjugated regio regular and regio random poly (3- hexylthiophene) (rr-P3HT and rra-P3HT) thin films were studied by near edge X-ray absorption fine structure spectroscopy, ultraviolet photoelectron spectroscopy and Penning ionization electron spectroscopy (PIES). The distribution of the surface electronic states was controlled on rr-P3HT and rra-P3HT thin films with different molecular ordering by varying the coating process and PIES was adopted to observe the electronic states existing outside the surface.

scholarly journals Exploring the Interfacial Phase and π–π Stacking in Aligned Carbon Nanotube/Polyimide Nanocomposites

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1158
Author(s):  
Qian Jiang ◽  
Qian Zhang ◽  
Xianyan Wu ◽  
Liwei Wu ◽  
Jia-Horng Lin
Keyword(s):  
Carbon Nanotube ◽  
Conjugated Polymer ◽  
Emission Spectroscopy ◽  
Fluorescence Emission ◽  
Interfacial Microstructure ◽  
Phase System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Π Stacking ◽  
Fluorescence Emission Spectroscopy

To characterize the interfacial microstructure and interaction at a nanoscale has a significant meaning for the interface improvement of the nanocomposites. In this study, the interfacial microstructure and features of aligned multiwalled carbon nanotube (MWNT) and conjugated polymer polyimide (PI) with three molecular structures were investigated using small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (WAXD), and fluorescence emission spectroscopy. It was found that aligned MWNT/PI nanocomposites had a nonideal two-phase system with the interfaces belonging to long period stacking ordered structure. Attributed to the π–π stacking effect, MWNT/BTDA-MPD presented the most regular arrangement verified by fractal dimension. By adopting a one-dimension correlation function, each phase dimension in aligned MWNT/PI nanocomposites was calculated and verified by high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The π–π stacking was demonstrated to be an important interaction between MWNT and PI via WAXD and fluorescence emission spectroscopy, and it was influenced by the linkage bond between benzene rings in PIs. This work is of significance to reveal the interfacial features between conjugated polymer and carbon nanotubes (CNTs), which is favorable for the interface design of CNT-based high performance nanocomposites.

Quenching of the Magnetic Field Effect on the Photocurrent and Photocurrent Detected Magnetic Resonance in Conjugated Polymer-Fullerene Diodes

1999 ◽  
Vol 598 ◽  
Author(s):  
M. C. Scharber ◽  
C. J. Brabec ◽  
F. Padinger ◽  
N. S. Sariciftci
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Metal Electrode ◽  
Polymer Devices ◽  
Plastic Solar Cells ◽  
The Magnetic Field

ABSTRACTWe have studied the effect of a magnetic field on the photocurrent of MDMO-PPV (poly(2-methoxy,5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene) and MDMOPPV/fullerene diodes (plastic solar cells) and performed photocurrent detected magnetic resonance (PCDMR) experiments on these devices consisting of an active layer sandwiched between a low and a high workfunction metal electrode. Results clearly show that the magnetic field effect (MFE) on the photocuttent as well as PCDMR signals are quenched in conjugated polymer/fullerene composite devices in contrast to large signals observed in the pristine conjugated polymer devices. Photoinduced electron transfer from conjugated polymers onto fullerene is proposed to be responsible for this quenching.

Optical and Electrical Properties of Modified Polythiophene with Tetrafluorobenzene Thin Film

2010 ◽  
Vol 93-94 ◽  
pp. 574-577
Author(s):  
M. Sittishoktram ◽  
Udom Asawapirom ◽  
Tanakorn Osotchan
Keyword(s):  
Thin Film ◽  
Conjugated Polymer ◽  
Optical Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
New Class ◽  
Modified Polymer ◽  
Flight Measurement ◽  
Characteristic Measurement

Modified poly(3-hexylthiophene) (P3HT) with molecule of 1,4-dithienyl-2,3,5,6-tetrafluorobenzene in the main chain was developed as a new class of conjugated polymer with high stability. The structural and optical characteristics of modified polymer were investigated by x-ray diffraction (XRD) and optical absorption spectroscopy. By comparing to characteristic of P3HT, the XRD pattern of modified polymer showed the diffraction peak shifted from theta of 5.4o to 5.9o with decrease intensity. This indicates that the modified polymer chain has a reducing in structural coplanarity and crystallinity. Since the electrical property can be related to the morphology and structure of thin film, the electrical conduction of modified polymer was studied with the structure of ITO/modified P3HT/Al. The result of I-V characteristic measurement of modified polymer as a function of temperatures showed that the conductance decreased with decreasing temperature. The mobility of copolymer was also evaluated by using time of flight measurement and mobility value of 5x10-4 cm2/Vs was obtained at room temperature.

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