Valence band spectroscopy on lignin

Klarhöfer, Lothar; Roos, B.; Viöl, Wolfgang; Höfft, Oliver; Dieckhoff, S.; Kempter, V.; Maus‐Friedrichs, W.

doi:10.1515/hf.2008.116

Cited by 21 publications

(24 citation statements)

References 18 publications

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“…An ultra high vacuum (UHV) apparatus with a base pressure of 5 Â 10 À11 hPa, which has been described in detail previously, 22,[29][30][31][32] is used to carry out the experiments. All measurements were performed at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…During all experiments cinnamyl alcohol has been evaporated at 40 C for 5 min, leading to a film with a thickness of about 1.8 nm estimated from the Au 4f peak attenuation in XPS. 22 Plasma treatments have been carried out employing a dielectric barrier discharge. The plasma source is mounted to the preparation chamber mentioned above and has been described elsewhere.…”

Section: Methodsmentioning

confidence: 99%

“…1(d)), we use this less complex molecule as the main lignin precursor for our investigations presented here. [21][22][23] The effect of plasma treatments on the discussed molecules has been studied previously. 24 In the course of that work, a significant decrease of carbon-oxygen single bonds was observed subsequent to plasma treatments in argon.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Silver nano particle formation on Ar plasma – treated cinnamyl alcohol

Dahle

Marschewski

Wegewitz

et al. 2012

Journal of Applied Physics

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Articles you may be interested inSilver nano-entities through ultrafast double ablation in aqueous media for surface enhanced Raman scattering and photonics applications Detection of organic vapors by graphene films functionalized with metallic nanoparticles Molecular orientation and electronic structure of 11,11,12,12-tetracyanonaphtho-2,6-quinodimethane vacuumdeposited on metal substrates: Charge transfer, complexation, and potassium doping J. Appl. Phys. 105, 023703 (2009); 10.1063/1.3055812Photoelectron spectroscopy study of metallic nanocluster arrangement at the surface of reactively sputtered amorphous hydrogenated carbon Metastable induced electron spectroscopy, ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy are employed to study the adsorption of silver on cinnamyl alcohol films prepared on Au(111) substrates by thermal evaporation. Additionally, the impact of an Ar atmosphere dielectric barrier discharge plasma applied to the cinnamyl alcohol film preliminary to the Ag adsorption is investigated. In both cases silver nano particles with an average diameter of 9 nm are formed. These particles do not interact chemically with the underlying cinnamyl alcohol film. We do not find any influence of the preliminary Ar plasma-treatment on the adsorption behavior at all.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Silver nano particle formation on Ar plasma – treated cinnamyl alcohol

Dahle

Marschewski

Wegewitz

et al. 2012

Journal of Applied Physics

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“…One of these is to reduce the film thickness making it as thin as possible. This was also done for wood-based polymers [15], but was not possible in our case. Another possibility is to use a neutraliser, which was done for measurements of cellulose [16] and lignin [17].…”

Section: Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Pyrolysis of wood-based polymer compounds

Haensel¹,

Comouth²,

Zydziak³

et al. 2010

Journal of Analytical and Applied Pyrolysis

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“…However, a combined study of lignin involving photoelectron spectroscopy and theoretical methods has not been performed to date. Klarhöfer et al (2008) investigated the valence band structure of lignin using ultraviolet photoelectron spectroscopy (UPS) and metastable induced electron spectroscopy (MIES). Dorrestijn et al (2000) simulated the linkage reactions in lignin with DFT.…”

Section: Introductionmentioning

confidence: 99%

Valence band structure of cellulose and lignin studied by XPS and DFT

et al. 2012

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In this report, X-ray induced photoelectron spectroscopy (XPS) measurements of the valence band structure of cellulose and lignin are combined with a theoretical reconstruction of the spectra based on density functional theory (DFT) calculations. These calculations involve an analysis of the valence band structures and their respective orbitals in which basic units of cellulose and lignin are considered. In addition, photoionization cross sections are incorporated for reconstruction of the XPS spectra. This combination of theoretical calculations and experimental measurements revealed that an emission present up to 10 eV in the valence band structure is dominated by oxygen rather than by carbon, as reported in literature. Furthermore, a quantitative elemental analysis shows significant carbon contributions at binding energies above 13 eV. The valence band analysis supported by DFT provides a powerful basis for a detailed interpretation of spectroscopic data and enables a profound insight into application relevant processes in future.

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Valence band spectroscopy on lignin

Cited by 21 publications

References 18 publications

Silver nano particle formation on Ar plasma – treated cinnamyl alcohol

Silver nano particle formation on Ar plasma – treated cinnamyl alcohol

Pyrolysis of wood-based polymer compounds

Valence band structure of cellulose and lignin studied by XPS and DFT

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