NO2 adsorption on Ni(100): A comparison of NO2 with CO2 adsorption

Geisler, H.; Odörfer, G.; Illing, Gerd; Jaeger, R.; Freund, H.‐J.; Watson, G. M.; Plummer, E. W.; Neuber, M.; Neumann, M.

doi:10.1016/0039-6028(90)90557-o

Cited by 21 publications

(13 citation statements)

References 33 publications

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“…[24] Upon exposure of the porphyrin film to NO 2 , the NEXAFS spectrum measured with s-polarized light shows a new feature at 402.3 eV with a shoulder at 401.5 eV (labeled D NO 2 , in Figure 6b, bottom), which we associated to the π* resonances of NO 2 . [41,42] The same peak is almost absent in p-polarization, suggesting an upward geometry of the NO bond in agreement with the calculated DFT adsorption structure and our IRAS results. Moreover, we also noticed only a moderate increase in the intensity of A N and B N , which suggests that the high charge transfer at the NO 2 -NiTPP/Cu(100) interface is almost preserved, in good agreement with the DFT predictions.…”

Section: The Macrocyclesupporting

confidence: 90%

Room‐Temperature On‐Spin‐Switching and Tuning in a Porphyrin‐Based Multifunctional Interface

Sturmeit

Cojocariu

Windischbacher

et al. 2021

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Molecular interfaces formed between metals and molecular compounds offer a great potential as building blocks for future opto-electronics and spintronics devices. Here, a combined theoretical and experimental spectro-microscopy approach is used to show that the charge transfer occurring at the interface between nickel tetraphenyl porphyrins and copper changes both spin and oxidation states of the Ni ion from [Ni(II), S = 0] to [Ni(I), S = 1/2]. The chemically active Ni(I), even in a buried multilayer system, can be functionalized with nitrogen dioxide, allowing a selective tuning of the electronic properties of the Ni center that is switched to a [Ni(II), S = 1] state. While Ni acts as a reversible spin switch, it is found that the electronic structure of the macrocycle backbone, where the frontier orbitals are mainly localized, remains unaffected. These findings pave the way for using the present porphyrin-based system as a platform for the realization of multifunctional devices where the magnetism and the optical/ transport properties can be controlled simultaneously by independent stimuli.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202104779.

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Section: The Macrocyclesupporting

confidence: 90%

Room‐Temperature On‐Spin‐Switching and Tuning in a Porphyrin‐Based Multifunctional Interface

Sturmeit

Cojocariu

Windischbacher

et al. 2021

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“…In studies of adsorption of NO 2 on Ni(100), the features between 400 and 402 eV have previously been assigned to transitions into unoccupied π* orbitals of NO and NO dimers . The additional intensity at around 401.3 eV in the two top spectra of Figure can be assigned to the lowest unoccupied π orbital of NO 2 as reported in refs − . The component at 403.3 eV is also associated to the π* of NO 2 , whereas the one at 405.1 eV corresponds to N 2 O 4 . ,, This confirms that the small component at high binding energies in the spectra in Figure a,b can be related to N 2 O 4 , and it is minimal.…”

Section: Resultssupporting

confidence: 70%

“…However, the spectra corresponding to NO 2 exposure are much richer in nature and clearly exhibit additional signals above 402 eV. In studies of adsorption of NO 2 on Ni(100), the features between 400 and 402 eV have previously been assigned to transitions into unoccupied π* orbitals of NO and NO dimers . The additional intensity at around 401.3 eV in the two top spectra of Figure can be assigned to the lowest unoccupied π orbital of NO 2 as reported in refs − .…”

Section: Resultssupporting

confidence: 53%

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Revealing the Adsorption Mechanisms of Nitroxides on Ultrapure, Metallicity-Sorted Carbon Nanotubes

et al. 2014

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Carbon nanotubes are a natural choice as gas sensor components given their high surface to volume ratio, electronic properties, and capability to mediate chemical reactions. However, a realistic assessment of the interaction of the tube wall and the adsorption processes during gas phase reactions has always been elusive. Making use of ultraclean single-walled carbon nanotubes, we have followed the adsorption kinetics of NO2 and found a physisorption mechanism. Additionally, the adsorption reaction directly depends on the metallic character of the samples. Franck–Condon satellites, hitherto undetected in nanotube–NOx systems, were resolved in the N 1s X-ray absorption signal, revealing a weak chemisorption, which is intrinsically related to NO dimer molecules. This has allowed us to identify that an additional signal observed in the higher binding energy region of the core level C 1s photoemission signal is due to the C=O species of ketene groups formed as reaction byproducts . This has been supported by density functional theory calculations. These results pave the way toward the optimization of nanotube-based sensors with tailored sensitivity and selectivity to different species at room temperature.

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“…For NO 2 , the similar behavior was observed. The NEXAFS N K‐edge spectra of molecules in gas phase contain the peaks between 401 and 401.8 eV corresponding to different molecular orbitals . The spectra of the adsorbed NO 2 molecules show the peak at 402.5 eV.…”

Section: Resultsmentioning

confidence: 99%

In situ XPS Observation of Selective NO_x Adsorption on the Oxygenated Graphene Films

Sysoev

Окотруб

Гусельников

et al. 2017

Physica Status Solidi (b)

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Graphene derivatives are promising sensor materials due to their high surface area available for molecule adsorption and conductivity changes under the adsorbate impact. The selectivity of such materials can be tuned through the attaching of certain functional groups preferably interacting with the defined gases. In the present work, we compare the reactivity of graphene oxide, oxyfluorinated graphene, and fluorinated graphene toward gaseous NO x molecules. The interaction of the molecules with the graphenebased films was monitored by in situ X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopy measurements. The spectra before and after exposure of the films to a gaseous NO x mixture detected equal concentrations of adsorbed NO 2 and NO species on graphene oxide, the preferable interaction of oxyfluorinated graphene with NO 2 and the absence of the adsorbed molecules on the fluorinated graphene surface. These results are useful for the development of selective graphene-based gas sensors.

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NO2 adsorption on Ni(100): A comparison of NO2 with CO2 adsorption

Cited by 21 publications

References 33 publications

Room‐Temperature On‐Spin‐Switching and Tuning in a Porphyrin‐Based Multifunctional Interface

Room‐Temperature On‐Spin‐Switching and Tuning in a Porphyrin‐Based Multifunctional Interface

Revealing the Adsorption Mechanisms of Nitroxides on Ultrapure, Metallicity-Sorted Carbon Nanotubes

In situ XPS Observation of Selective NO_x Adsorption on the Oxygenated Graphene Films

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NO2 adsorption on Ni(100): A comparison of NO2 with CO2 adsorption

Cited by 21 publications

References 33 publications

Room‐Temperature On‐Spin‐Switching and Tuning in a Porphyrin‐Based Multifunctional Interface

Room‐Temperature On‐Spin‐Switching and Tuning in a Porphyrin‐Based Multifunctional Interface

Revealing the Adsorption Mechanisms of Nitroxides on Ultrapure, Metallicity-Sorted Carbon Nanotubes

In situ XPS Observation of Selective NOx Adsorption on the Oxygenated Graphene Films

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In situ XPS Observation of Selective NO_x Adsorption on the Oxygenated Graphene Films