XPS investigation on the reactivity of surface imine groups with TFAA

Kehrer, Matthias; Duchoslav, Jiri; Hinterreiter, Andreas; Cobet, Munise; Mehic, Alen; Stehrer, T.; Stifter, David

doi:10.1002/ppap.201800160

Cited by 150 publications

(82 citation statements)

References 38 publications

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“…As far as nitrogen is concerned, the N1s band ( Figure S6 ) can be well-fitted only by assuming the overlap of two different components, having approximately the same intensity, centered at 399.8 and at 401.1 eV of binding energy. The first component is in agreement with the presence of nitrogen involved in amine functional groups, the second one in amide compounds [ 39 ].…”

Section: Resultsmentioning

confidence: 55%

Biobased Carbon Dots: From Fish Scales to Photocatalysis

et al. 2021

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The synthesis, characterization and photoreduction ability of a new class of carbon dots made from fish scales is here described. Fish scales are a waste material that contains mainly chitin, one of the most abundant natural biopolymers, and collagen. These components make the scales rich, not only in carbon, hydrogen and oxygen, but also in nitrogen. These self-nitrogen-doped carbonaceous nanostructured photocatalyst were synthesized from fish scales by a hydrothermal method in the absence of any other reagents. The morphology, structure and optical properties of these materials were investigated. Their photocatalytic activity was compared with the one of conventional nitrogen-doped carbon dots made from citric acid and diethylenetriamine in the photoreduction reaction of methyl viologen.

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Section: Resultsmentioning

confidence: 55%

Biobased Carbon Dots: From Fish Scales to Photocatalysis

et al. 2021

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“…This is supported by Ahmad and colleagues' results, who observed a B-F component in a comparable region 52 . Furthermore, the peak centered 195 eV could be assigned to BF 4 + species following a similar argument that charged ammonium species are located at higher energies than their corresponding neutral nitrogen functionalities in the N1s area 53 – 55 . Lastly, the position of the feature in the F1s area is also in line with the literature regarding the expected position for an F-B functionality 52 .…”

Section: Resultsmentioning

confidence: 69%

Enhancing thermoelectric properties of single-walled carbon nanotubes using halide compounds at room temperature and above

Kumanek

Stando

et al. 2021

Sci Rep

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Carbon nanotubes (CNTs) are materials with exceptional electrical, thermal, mechanical, and optical properties. Ever since it was demonstrated that they also possess interesting thermoelectric properties, they have been considered a promising solution for thermal energy harvesting. In this study, we present a simple method to enhance their performance. For this purpose, thin films obtained from high-quality single-walled CNTs (SWCNTs) were doped with a spectrum of inorganic and organic halide compounds. We studied how incorporating various halide species affects the electrical conductivity, the Seebeck coefficient, and the Power Factor. Since thermoelectric devices operate under non-ambient conditions, we also evaluated these materials' performance at elevated temperatures. Our research shows that appropriate dopant selection can result in almost fivefold improvement to the Power Factor compared to the pristine material. We also demonstrate that the chemical potential of the starting CNT network determines its properties, which is important for deciphering the true impact of chemical and physical functionalization of such ensembles.

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“…The high-resolution B1s scan in Figure 2 b shows that 75% of the boron is B-C bonded and the remaining 25% is B-B bonded [ 38 , 39 ]. The high-resolution C1s scan in Figure 2 c shows that 9% of the carbon is C-O bonded and the high-resolution O1s scan also shows C-O bonding in Figure 2 d [ 40 , 41 ]. Figure 2 c also shows that 22% of the carbon is C-C bonded and the remaining 69% is B-C bonded [ 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Superhard Boron-Rich Boron Carbide with Controlled Degree of Crystallinity

et al. 2020

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Superhard boron-rich boron carbide coatings were deposited on silicon substrates by microwave plasma chemical vapor deposition (MPCVD) under controlled conditions, which led to either a disordered or crystalline structure, as measured by X-ray diffraction. The control of either disordered or crystalline structures was achieved solely by the choice of the sample being placed either directly on top of the sample holder or within an inset of the sample holder, respectively. The carbon content in the B-C bonded disordered and crystalline coatings was 6.1 at.% and 4.5 at.%, respectively, as measured by X-ray photoelectron spectroscopy. X-ray diffraction analysis of the crystalline coating provided a good match with a B50C2-type structure in which two carbon atoms replaced boron in the α-tetragonal B52 structure, or in which the carbon atoms occupied different interstitial sites. Density functional theory predictions were used to evaluate the dynamical stability of the potential B50C2 structural forms and were consistent with the measurements. The measured nanoindentation hardness of the coatings was as high as 64 GPa, well above the 40 GPa threshold for superhardness.

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XPS investigation on the reactivity of surface imine groups with TFAA

Cited by 150 publications

References 38 publications

Biobased Carbon Dots: From Fish Scales to Photocatalysis

Biobased Carbon Dots: From Fish Scales to Photocatalysis

Enhancing thermoelectric properties of single-walled carbon nanotubes using halide compounds at room temperature and above

Superhard Boron-Rich Boron Carbide with Controlled Degree of Crystallinity

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