Adsorption and reaction of propene on Ni(100)

A TEMPERATURE-PROGRAMMED X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF THE DECOMPOSITION REACTIONS OF UNSATURATED HYDROCARBONS ON Ni(100)

“…6 With such an experimental setup we have been able to follow the temperature dependence of the surface chemistry, distinguishing various intermediate species in situ by monitoring the C 1s core level binding energies and intensities. Our results are in good agreement with reported reaction paths for acetylene, ethylene and propene previously determined by HREELS, 7-10 XPS, 11,12 UPS, [12][13][14][15] Auger electron spectroscopy (AES), 11,16-20 static secondary ion mass spectrometry (SSIMS), 21,22 nearedge X-ray absorption fine structure (NEXAFS), 23 laser-induced desorption (LID), 7,24 temperatureprogrammed desorption (TPD) 7,8,[11][12][13]15,21,22 and single-crystal adsorption calorimetry (SCAC). 25 A significant feature of our work is the ability to obtain quantitative information on the evolution of individual species on the surface in the form of intensityversus-temperature curves which are complementary to existing TPD data.…”

“…Previously reported desorption temperature ranges for acetylene, ethylene, propene and hydrogen are highlighted by gray bars (peak maxima indicated by vertical lines) for reference. 7,8,13,15,21,22 In Fig. 2(a), we obtain a signal from the molecularly adsorbed acetylene at 105 K which decreases with increasing temperature.…”

“…For ethylene adsorbed The gray inset bars show the acetylene, ethylene, propene and hydrogen desorption ranges (peak maxima indicated by vertical lines). 7,8,13,15,21,22 on Ni(100), there is some disagreement about the type of bonding below 150 K. While some authors favor π-bonding, 7,19 more recent studies prefer σ-bonding. 9,32,33 At 90 K, we observe the C 1s spectrum characteristic of molecularly adsorbed ethylene with a shoulder on the high binding energy side of the peak maximum due to a vibrational-excited state (see Table 1) discussed in detail elsewhere.…”

“…25 A significant feature of our work is the ability to obtain quantitative information on the evolution of individual species on the surface in the form of intensityversus-temperature curves which are complementary to existing TPD data. 7,8,11,12,15,21,22 This approach has not only allowed the clarification of the dehydrogenation mechanisms of acetylene and ethylene, for which there are several discrepancies in the literature, 8,12,13,16,25 but also provided new insight into the decomposition of propene on Ni(100). In this summary report we note the salient results of our studies.…”

Thin-film metal oxides in organic semiconductor devices: their electronic structures, work functions and interfaces

“…[130][131][132][133][134][135][136] There are numerous examples from adsorption studies that demonstrate interfaces in which hybridization between adsorbate and substrate electronic states gives rise to distinct interface states. Work done between the 1970s and present day has provided many examples of such interfaces, involving small organic molecules on metals, 131,132,134,[136][137][138][139][140][141][142][143][144][145][146][147][148][149][150] noble gas atoms on metals, [151][152][153][154][155][156][157] small inorganic molecules (such as CO, [158][159][160][161][162][163][164] NO 165 and H 2 O 166,167 ) on metals and oxides, 160,161 and various organic semiconductors on metals and inorganic semiconductors. 131,132,134,…”