Electronic states of conducting polymers studied by UPS

Sakamoto, Hirokazu; Itow, Mikiro; Kachi, Naoki; Kawahara, T.; Mizoguchi, K.; Ishii, Hiroyuki; Miyahara, Tsuneaki; Yoshioka, Kenichi; Masubuchi, S.; Kazama, S.; Matsushita, Tomohiro; Sekiyama, A.; Suga, S.

doi:10.1016/s0368-2048(98)00117-0

Cited by 9 publications

(8 citation statements)

References 16 publications

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“…It should be mentioned that the three bands A-C observed in both the nonresonant and resonant carbon X-ray emission spectra, correspond well in energy with the three bands observed in photoemission spectra of PANi reported by H. Sakamoto et al [7]. In valence band photoemission spectroscopy, the same final states are obtained as in the non-resonant carbon 1s X-ray emission spectra.…”

Section: Resonant and Nonresonant X-ray Emission Spectra At The Carbo...supporting

confidence: 86%

“…Figure 1 shows the basic chemical structure of one repeat unit of PANi. [6][7][8][9][10] In each repeat unit there are three benzene rings ͑denoted 1-3 in Fig. 1͒ separated by amine ͑-NH͒ groups and one quinoid ring ͑4͒ surrounded by imine ͑-Nv͒ groups.…”

Section: Introductionmentioning

confidence: 99%

“…Among the various available conducting polymers, PANi is of particular interest since it has a rather high electrical conductivity in the doped phases, and is relatively easy to synthesize. Figure 1 shows the basic chemical structure of one repeat unit of PANi [6,7,8,9,10]. In each repeat unit there are three benzene rings (denoted 1-3 in Fig.…”

Section: Introductionmentioning

confidence: 99%

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The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

Magnuson

Guo

Butorin

et al. 1999

The Journal of Chemical Physics

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The electronic structure of the conjugated polymer, polyaniline, has been studied by resonant and nonresonant soft x-ray emission spectroscopy using synchrotron radiation for the excitation. The measurements were made on polyaniline and a few doped ͑protonated͒ phases for both the carbon and nitrogen contents. The resonant x-ray emission spectra show depletion of the electron bands due to the selective excitation which enhances the effect of symmetry selection rules. The valence band structures in the x-ray emission spectra attributed to the bands show unambiguous changes of the electronic structure upon protonation. By comparing to x-ray absorption measurements, the chemical bonding and electronic configuration is characterized.

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Section: Resonant and Nonresonant X-ray Emission Spectra At The Carbo...supporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

Magnuson

Guo

Butorin

et al. 1999

The Journal of Chemical Physics

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“…Two major intense bands are detected at around 6 and 10 eV. These binding energies resemble those reported for -conjugated polymers, 63 where they are assigned to the energy for the orbitals with character and + character, respectively. These spectra show that the general shapes of spectra are basically the same, which indicates that the chemical structure of poly͑dG͒-poly͑dC͒ is not significantly modified upon iodine doping.…”

Section: A X-ray Pes Vuv Pes and Xassupporting

confidence: 75%

Electronic states of the DNA polynucleotides poly(dG)-poly(dC) in the presence of iodine

et al. 2007

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The electronic states of chemically doped DNA polynucleotides ͓poly͑dG͒-poly͑dC͔͒ have been studied by photoelectron spectroscopy, x-ray absorption spectroscopy, and Raman spectroscopy, in order to understand the charge conduction mechanism of this material. Upon iodine doping ͑i.e., hole doping͒, we clearly observed radical cation formation on DNA bases, and the appearance of additional occupied and unoccupied electronic states within the band gap of poly͑dG͒-poly͑dC͒. Referring to the analogous studies for -conjugated conductive polymers, we point out that the charges induced by iodine doping and their derived electronic states are important origins of the hole-conductive electrical properties of poly͑dG͒-poly͑dC͒.

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“…[40][41][42] The valence band photoemission spectra of protonated PANI samples have been studied by ultraviolet photoelectron spectroscopy (UPS). 44 Comparing the observed spectra with the band calculations, [45][46][47] the spectra contain structural features at the BE around 3.5 eV for the π band, at around 8 eV for the π and σ band, and 13.5 eV for the σ band. Figure 10 shows the XPS valence band spectra from 0 to 20 eV for the deprotonated (part a) and reprotonated (part b) PANI-An-GA-g-Si surfaces.…”

Section: Resultsmentioning

confidence: 86%

Oxidative Graft Polymerization of Aniline on Modified Si(100) Surface

et al. 2001

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Chemical modification of the argon plasma-pretreated Si(100) surface by UV-induced surface graft polymerization with either glycidyl methacrylate (GMA) or glycidyl acrylate (GA) was carried out. The GA graft polymerized Si substrate was further subjected to coupling reaction with aniline (An) and finally oxidative graft polymerization of An. The composition and microstructure of the graft-polymerized Si(100) surfaces were studied by X-ray photoelectron spectroscopy (XPS) and imaging XPS, respectively. The graft concentrations of the GMA polymer, GA polymer, and An polymer increased with increasing concentration of the respective monomer used for graft polymerization. The graft polymerization efficiency of GA on the Ar plasma-pretreated Si(100) was much higher than that of GMA. Ethanol, when used as a solvent, catalyzed the coupling reaction of the epoxide groups of GA with An and should be of more than 40 vol % in concentration to achieve the optimum effect. The protonation-deprotonation characteristics, interconvertible intrinsic redox states, and metal reduction behavior of the polyaniline (PANI) chains, obtained from subsequent oxidative graft polymerization of An on the modified Si(100) surface, were grossly similar to those of the PANI homopolymer. The resistance of the modified Si(100) surface from consecutive graft polymerization with GA and An was on the order of 10 7 Ω/sq.

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Electronic states of conducting polymers studied by UPS

Cited by 9 publications

References 16 publications

The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

Electronic states of the DNA polynucleotides poly(dG)-poly(dC) in the presence of iodine

Oxidative Graft Polymerization of Aniline on Modified Si(100) Surface

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