Determination of amino groups on functionalized graphene oxide for polyurethane nanomaterials: XPS quantitation vs. functional speciation

Abstract

Simple spectrophotometric method for the estimation of accessible amino groups and preparation of polyurethane nanocomposites.

A Lithium‐Ion Battery using a 3 D‐Array Nanostructured Graphene–Sulfur Cathode and a Silicon Oxide‐Based Anode

“…The sulfur weightr atio in the composite was evaluated to be of the order of 65 %b yt hermogravimetric analysis( TGA;s ee the SupportingI nformation, Figure S1), which shows ao ne-step weight loss between T = 150 and 300 8C, attributedt ot he evaporation of sulfur. Indeed, the data indicate an egligible contribution of the p!p*t ransition and the hydroxy groups, [33][34][35] as well as a strong signal at the binding energy of the epoxy group for GO and, by contrast, al arge contribution of the CÀCb ond and minor surface functionalgroups for 3DG. [29,30] Furthermore, X-ray photoelectron spectroscopy (XPS) analysiso ft he sample (Figure 1c,d)a llows evaluation of the solvothermalt reatment effects on the surface functional groups of the carbon matrix.…”

“…[32] The contribution of each component is summarized in Table 1, which reveals significant deoxygenation for 3DG with respect to GO. Indeed, the data indicate an egligible contribution of the p!p*t ransition and the hydroxy groups, [33][34][35] as well as a strong signal at the binding energy of the epoxy group for GO and, by contrast, al arge contribution of the CÀCb ond and minor surface functionalgroups for 3DG.…”

Catalyst–Electrolyte Interactions in Aqueous Reline Solutions for Highly Selective Electrochemical CO2 Reduction

“…All anodized Ag foils in Figure A were cleaned by sonication in water before XPS, but we still observed XPS peaks related to adsorption of urea and ChCl on foils that had been immersed in reline, urea, and ChCl. The foils immersed in 50 wt % reline and urea exhibited a small Ag–organic amine peak at (369.4±0.1) eV in the Ag 3d spectra, and peaks at (285.7±0.3) and (287.7±0.3) eV in the C 1s spectra, which could be assigned to C−NH 2 and C=O, respectively . These deconvoluted peaks in Ag 3d and C 1s spectra indicate urea adsorption on the Ag surface.…”

“…The foils immersed in 50 wt % reline and urea exhibited a small Ag–organic amine peak at (369.4±0.1) eV in the Ag 3d spectra, and peaks at (285.7±0.3) and (287.7±0.3) eV in the C 1s spectra, which could be assigned to C−NH 2 and C=O, respectively . These deconvoluted peaks in Ag 3d and C 1s spectra indicate urea adsorption on the Ag surface. On the anodized Ag foil that had been immersed in ChCl, we observed a C 1s peak at (285.2±0.1) eV that may be attributed to adsorption of choline ions [(CH 3 ) 3 N+CH 2 CH 2 OH] .…”

Adhesion-Increased Carbon Nanowalls for the Electrodes of Energy Storage Systems

“…The O1s peak here appears to have been attached to the CNW due to its exposure to air. Indeed, if the stickiness was caused by the activity of the functional group, the shoulder peak should have been released [29,30], but no significant change in the C1s peak was observed. The peaks of the sp 3 and sp 2 structures were confirmed by the CNW mechanism.…”