Surface characterization of carbon fibers using angle-resolved XPS and ISS

Gardner, Steven D.; Singamsetty, Chakravarthy S. K.; Booth, Glyn L.; He, Guoren; Pittman, Charles U.

doi:10.1016/0008-6223(94)00144-o

Cited by 432 publications

(279 citation statements)

References 20 publications

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“…3, all samples have similar densities of state (DOS) near the Fermi level (E F ) as indicated by the overlay of the spectra in the inset. However, MFG-P does have a more pronounced O 2s band at 21.9 eV, suggesting that this graphite moiety is covered with larger amounts of surface carbonyl groups as stated in other studies [23][24][25]. This observation is further supported by the broadening of MFG-P's C 1s spectrum towards higher binding energies shown in Fig.…”

Section: Resultssupporting

confidence: 82%

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

et al. 2017

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This work investigates the viability and outlines the current challenges in electrochemical quartz crystal nanobalance (EQCN) experiments on supported Pt catalysts. EQCN experiments involving Pt supported on 2-D "surface-treated graphite sputtered onto quartz crystal" (Pt/MFG-H) catalysts were compared to standard polycrystalline Pt (Pt poly ), which showed similarities in frequency versus potential trends; however, the Pt/MFG-H catalysts obtained higher frequencies due to the support capacitance. The physical characterizations (XRD and XPS) and electrochemical responses, mainly cyclic voltammetry in acidic media and the ferri/ferrocyanide couple, of the 2-D Pt/MFG-H were compared to the representative 2-D Pt supported on treated highly orientated pyrolytic graphite (Pt/HOPG-H), in order to make assertions on the similarities between the two catalysts. The XRD diffraction patterns and the XPS valence band structure for the treated and untreated MFG (-H and -P, respectively) and HOPG (-H and -P, respectively) demonstrated similarities. Nevertheless, the cyclic voltammograms and peak positions of the ferri/ferrocyanide couple between the treated and untreated MFG and HOPG catalysts were dissimilar. However, EQCN may be used qualitatively between the two different 2-D catalysts since the same trends in electrochemical responses before and after treatment of the MFG and HOPG catalysts were seen. Hence, the EQCN technique can be used in future studies as an alternative method to study degradation mechanisms of Pt and carbon for PEFCs.

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Section: Resultssupporting

confidence: 82%

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

et al. 2017

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“…The results showed Ti and O binding (530.2 eV) and C and O binding (531.7 eV). 21,22) The C and O binding was considered to be surface impurities, and the Ti and O binding could be identified as titanium oxide through an analysis of the thin boundary interface between particles as shown in Fig. 8.…”

Section: Resultsmentioning

confidence: 99%

Effect of Powder Preheating Temperature on the Properties of Titanium Coating Layers Manufactured by Kinetic Spraying

Lee

2014

Mater. Trans.

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This study investigated the effect of powder preheating temperature on the properties of titanium coating layers made through the kinetic spray process. Specifically, kinetic sprayed coating layers were made under three different conditions with regard to powder preheating temperatures: no preheating, 500°C, and 800°C in manufacturing processes. Titanium coating layers using pure powder feedstock were made regardless of the powder preheating temperature without any change in phase. The porosity and hardness values of the coating layers were as follows: 3.3%, 281 Hv under the no preheating condition; 2.6%, 232 Hv under 500°C preheating, and; 0.4%, 224 Hv under 800°C preheating. As the powder preheating temperature increased, porosity decreased remarkably, and hardness increased; thus enabling the formation of denser coating layer. Note, however, that the thin oxide on the interface of the deposited particles increased as the powder preheating temperatures increased. The optimum process condition for manufacturing pure titanium coating layer was also discussed.

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“…Consequently, the oxygen (1s) peak shown in Figure 10 was considered as Si-related oxides rather than TiAO components. Sputtering for 60 s completely eliminates the peak of Si-related oxides (530.8 eV) that the new deconvolution results, believed to be TiAO 36,38,39 and C¼ ¼O, were obtained at 530.0 and 532.0 eV, respectively.…”

Section: Xpsmentioning

confidence: 95%

Effect of TiO₂ on thermal and adhesive characteristics of poly(imide siloxane)/TiO₂ hybrid films

Tseng

Whang

et al. 2011

J of Applied Polymer Sci

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A novel poly(imide siloxane)/titania (PIS/ TiO 2 ) hybrid film was fabricated by sol-gel process via in situ formation of TiO 2 within PIS matrix. Poly(amic acid siloxane) (PAAS) was prepared from 4,4 0 -oxydiphthalic anhydride, 2,2-bis [4-(4-aminophenoxy) phenyl] propane, and a,x-bis(3-aminopropyl)polydimethylsiloxane (APPS). Chelating agent, acetylacetone, and catalyst-free polymerization were used to reduce the rate of hydrolysis of titanium alkoxide in the PAAS. X-ray photoelectron spectroscopy data showed that the presence of APPS promotes the Ti surface composition of PIS/TiO 2 hybrid film. The effects of TiO 2 and APPS contents on the characteristics of surface, thermostability, coefficient of thermal expansion (CTE), and the strength of adhesion were investigated. The presence of TiO 2 on the surface of the hybrid films enhanced the adhesive strength at the interface of PIS/TiO 2 hybrid film and copper foil. When more TiO 2 was incorporated into the PIS matrix, the PIS/TiO 2 hybrid film exhibited lower CTE while retaining favorable mechanical and thermal properties.

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Surface characterization of carbon fibers using angle-resolved XPS and ISS

Cited by 432 publications

References 20 publications

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

Effect of Powder Preheating Temperature on the Properties of Titanium Coating Layers Manufactured by Kinetic Spraying

Effect of TiO₂ on thermal and adhesive characteristics of poly(imide siloxane)/TiO₂ hybrid films

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Surface characterization of carbon fibers using angle-resolved XPS and ISS

Cited by 432 publications

References 20 publications

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

Effect of Powder Preheating Temperature on the Properties of Titanium Coating Layers Manufactured by Kinetic Spraying

Effect of TiO2 on thermal and adhesive characteristics of poly(imide siloxane)/TiO2 hybrid films

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Product

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Effect of TiO₂ on thermal and adhesive characteristics of poly(imide siloxane)/TiO₂ hybrid films