Doping of Polyaniline in the Solid State with Photogenerated Triflic Acid

Potje‐Kamloth, Karin; Polk, Brian J.; Josowicz, Mira; Janata, Jiřı́

doi:10.1021/cm020181z

Cited by 23 publications

(17 citation statements)

References 23 publications

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“…The increase in V T can be attributed to a decrease in E F along with a change in the surface component of WF. Protonation increases the WF and introduces delocalized charge carriers in the film as verified by Kelvin probe 25 and UV-Vis experiments, 26 respectively. Furthermore, Fig.…”

Section: Resultsmentioning

confidence: 81%

Fluctuation analysis of an organic semiconductor–insulator interface

West

Josowicz

Janata

2013

Phys. Chem. Chem. Phys.

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The space-charge region of an organic semiconductor (OS)-insulator interface is probed by analyzing the spontaneous, thermally driven drain current fluctuations of a field-effect transistor in which the OS forms the gate electrode. This so called "excess drain current noise" is the outcome of local fluctuations of the Fermi level, resulting from stochastic exchange of electrons between traps near the Fermi level. The power spectral density of this noise is characteristic of a Lorentzian process with a distribution of time constants, which is attributed to the disorder in the OS film. Furthermore, this disorder leads to local inhomogeneity of the work function in the film and a finite correlation length of the work function fluctuations. The measurement of work function noise is only possible within a correlation length of the OS-insulator interface. Through systematic variation of gate voltage, primary doping and secondary doping levels, the correlation length, disorder, and the trapping/de-trapping time constant are examined on polyaniline as a representative OS. A model is proposed for local work function variations and spontaneous charge-carrier fluctuations within polyaniline films with consequences for organic electronics using organic semiconductors.

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Section: Resultsmentioning

confidence: 81%

Fluctuation analysis of an organic semiconductor–insulator interface

West

Josowicz

Janata

2013

Phys. Chem. Chem. Phys.

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“…The band at B880 nm is ascribed to the p-polaron transition of protonated PANI, which indicates the protonation and the degree of electron delocalization in PANI. 27,28 The peaks were selected from this region, and the results are listed in Table 3.…”

Section: Ftir Spectra Of the Pp/cpp-so 3 H/pani And Pp/cpp/pani Compomentioning

confidence: 99%

Sulfonation of chlorinated polypropylene and its influence on the microstructure and the electric properties of polypropylene/chlorinated polypropylene/polyaniline composites

Yang

Zhang

Wang

et al. 2012

Polym J

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Sulfonated CPP (CPP-SO 3 H) was prepared by modifying chlorinated polypropylene (CPP). The results of Fourier transform infrared spectroscopy (FTIR) illustrate that the sulfonic acid group (-SO 3 H) was successfully grafted onto CPP. Polypropylene (PP)/CPP-SO 3 H/polyaniline (PANI) and PP/CPP/PANI composites were prepared, and the microstructures and electric properties of the corresponding composites were carefully investigated by scanning electron microscopy (SEM), FTIR, ultraviolet (UV)-vis and wide-angle X-ray diffraction (WAXD). Compared with that of the PP/CPP/PANI composite, the volume resistivity of the PP/CPP-SO 3 H/PANI composites is lower. The UV-vis results show that PANI can be doped with CPP-SO 3 H and that the interactional strength between PANI and CPP-SO 3 H increases because of the introduction of -SO 3 H. The results of WAXD show that CPP-SO 3 H is more easily inserted into the interspaces of PANI-dodecylbenzene sulfonic acid and makes the layer distance increase compared with that of CPP. The addition of CPP-SO 3 H can improve the crystallinity of the composites. The results of SEM show that the introduction of -SO

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“…This vapor doping process produces more free electron spins in PANI as indicated by the change of the dark blue color of PANI-EB to dark green of polyaniline-emeraldine salt ͑PANI-ES͒. [17][18][19] The magnetic field response experiments were then commenced.…”

Section: B Measurement Protocolmentioning

confidence: 99%

Development of a magnetic quartz crystal microbalance

Hunt

Josowicz

et al. 2007

Review of Scientific Instruments

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A new technique for measurement of magnetic properties of materials is demonstrated. It can be used for the measurement of thin magnetic films during their chemical modification. The resonance frequency of a quartz crystal microbalance (QCM) with conducting polymer (polyaniline) suspension in poly(ethylene glycol) was observed to increase with increasing the externally applied uniform dc magnetic field. Slowly sweeping the magnetic field between 0 and 3.1 T results in a frequency-field response curve. Chemical doping was done by exposing the polyaniline-emeraldine base film to HCl vapor. The change in population of free spins is reflected in increased frequency-field curve magnitude after HCl doping. Two working hypotheses explaining this observation are offered to explain how frequency of QCM with deposited magnetic film shifts with increasing intensity of the magnetic field.

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Doping of Polyaniline in the Solid State with Photogenerated Triflic Acid

Cited by 23 publications

References 23 publications

Fluctuation analysis of an organic semiconductor–insulator interface

Fluctuation analysis of an organic semiconductor–insulator interface

Sulfonation of chlorinated polypropylene and its influence on the microstructure and the electric properties of polypropylene/chlorinated polypropylene/polyaniline composites

Development of a magnetic quartz crystal microbalance

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