Photoelectron Spectroscopy Applications to Materials Science

Casu, Maria Benedetta; Chassé, Thomas

doi:10.1002/9783527654703.ch45

Cited by 4 publications

(6 citation statements)

References 105 publications

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“…When the assembly thickness is high enough, this specific interaction is smeared by the overall contributions and the XPS line shape comes back to the initial "pointed" shape. Note that there is no change in the stoichiometry dependence of the XPS signal for the various films: They all fulfill the "intact molecule" requirement, 32,42 Solid state effects on the XPS line shape and shake up intensities are reported in the literature when comparing solid state and gas phase spectra of several small molecules; 26,43−45 however, this information was not yet correlated to morphological investigation.…”

Section: ■ Results and Discussionmentioning

confidence: 83%

Intercorrelation of Electronic, Structural, and Morphological Properties in Nanorods of 2,3,9,10-Tetrafluoropentacene

Savu

Sonström

Bula

et al. 2015

ACS Appl. Mater. Interfaces

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We evidence the intercorrelation of electronic, structural, and morphological properties in nanorods of a substituted fluorine-based pentacene, 2,3,9,10-tetrafluoropentacene, deposited on gold single crystals by using photoemission and X-ray absorption spectroscopy investigations. Our investigations show changes in the XPS spectroscopy lines, and NEXAFS features correlate with the specific structure of the assemblies and their morphology. Consequently, the chemical structure affects not only the molecular electronic structure and the way the molecules assemble in a film but also the film morphology leading to specific thin film electronic properties.

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Section: ■ Results and Discussionmentioning

confidence: 83%

Intercorrelation of Electronic, Structural, and Morphological Properties in Nanorods of 2,3,9,10-Tetrafluoropentacene

Savu

Sonström

Bula

et al. 2015

ACS Appl. Mater. Interfaces

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“…XPS is an effective and powerful tool for investigation of organic and organic radical thin films . Besides providing insight into the occupied states, it is element-sensitive, and it can also deliver quantitative information on the stoichiometric composition of the films, due to the high sensitivity of the signal to the concentration of the emitting atoms. In addition, the features contributing to the spectroscopic lines are sensitive to the different chemical environment of the atoms of the same element.…”

Section: Results and Discussionmentioning

confidence: 99%

Thermally and Magnetically Robust Triplet Ground State Diradical

et al. 2019

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High spin (S = 1) organic diradicals may offer enhanced properties with respect to several emerging technologies, but typically exhibit low singlet triplet energy gaps and possess limited thermal stability. We report triplet ground state diradical 2 with a large singlet-triplet energy gap, ΔE ST ≥ 1.7 kcal mol −1 , leading to nearly exclusive population of triplet ground state at room temperature, and good thermal stability with onset of decomposition at ~160 °C under inert atmosphere. Magnetic properties of 2 and the previously prepared diradical 1 are characterized by SQUID magnetometry of polycrystalline powders, in polystyrene glass, and in other matrices. Polycrystalline diradical 2 forms a novel one-dimensional (1D) spin-1 (S = 1) chain of organic radicals with intrachain antiferromagnetic coupling of J′/k = −14 K, which is associated with the N•••N and N•••O intermolecular contacts. The intrachain antiferromagnetic coupling in 2 is by far strongest among all studied 1D S = 1 chains of organic radicals, which also makes 1D S = 1 chains *

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“…7 The method is element-sensitive, and allows insight into the stoichiometry of the film, and is sensitive towards the different chemical environments of atoms of the same element. 20 We focus on the C 1s and N 1s core level spectra (for NN-Blatter in Figure 1) because the O 1s core level spectrum is the sum of the substrate (SiO2/Si(111) wafers) and molecule signals, making the analysis unreliable. What is important is that the unpaired electrons are in the moieties containing nitrogen atoms.…”

Section: Resultsmentioning

confidence: 99%

“…We used X-ray photoelectron spectroscopy (XPS) to investigate the thin films because it is proven to be an efficient tool for the investigation of organic radical thin films . The method is element-sensitive and allows insights into the stoichiometry of the film, and it is sensitive toward the different chemical environments of atoms of the same element …”

Section: Resultsmentioning

confidence: 99%

Challenges in Controlled Thermal Deposition of Organic Diradicals

et al. 2021

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We have demonstrated that it is possible to evaporate diradicals in a controlled environment obtaining thin films in which the diradical character is preserved. However, evaporation represents a challenge. The presence of two radical sites makes the molecules more reactive, even in case of very stable single radicals. We have explored the parameters that play a role in this phenomenon. Bulk formation thermodynamics and delocalisation of the unpaired electrons play the major role. The higher the formation energies of the crystal, the more difficult is the evaporation of intact radicals. The larger the delocalization, the more stable is the film exposed

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Photoelectron Spectroscopy Applications to Materials Science

Cited by 4 publications

References 105 publications

Intercorrelation of Electronic, Structural, and Morphological Properties in Nanorods of 2,3,9,10-Tetrafluoropentacene

Intercorrelation of Electronic, Structural, and Morphological Properties in Nanorods of 2,3,9,10-Tetrafluoropentacene

Thermally and Magnetically Robust Triplet Ground State Diradical

Challenges in Controlled Thermal Deposition of Organic Diradicals

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