Surface Response of Brominated Carbon Media on Laser and Thermal Excitation: Optical and Thermal Analysis Study

Abstract

The present study is objected to develop an analytical remote optical diagnostics of the functionalized carbons surface. Carbon composites with up to 1 mmol g−1 of irreversibly adsorbed bromine were produced by the room temperature plasma treatment of an activated carbon fabric (ACF) derived from polyacrylonitrile textile. The brominated ACF (BrACF) was studied by elastic optical scattering indicatrix analysis at wavelength 532 nm. The obtained data were interpreted within results of the thermogravimetric analysis, X-ray photoelectron spectroscopy and temperature programmed desorption mass spectrometry. The bromination dramatically reduces the microporosity producing practically non-porous material, while the incorporated into the micropores bromine induces the dielectric and structural impact on surface polarizability and conductivity due to the charging effect. We have found that the elastic optical scattering in proper solid angles in the forward and the backward hemispheres is sensitive to the kind of the bromine bonding, e.g., physical adsorption or chemisorption, and the bromination level, respectively, that can be utilized for the express remote fabrication control of the nanoscale carbons with given interfaces.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-1873-7) contains supplementary material, which is available to authorized users.

Surface reactivity of nanoporous carbons: preparation and physicochemical characterization of sulfonated activated carbon fibers

“…In contrast to the routes that give adsorbed or intercalated bromine species (Multian et al 2017;Hanelt et al 2013), here we used a post-treatment with a 10 mass% K 2 C 2 O 4 solution and intensive washing. This treatment removes the physisorbed reagent by the selective fixing and the followed elution from the brominated ACFs, in the form of KBr.…”

“…Free bromine recombines with the surface hydrogen, and it can be desorbed in the form of hydrobromic acid (HBr) molecules (Diyuk et al 2015;Multian et al 2017). The temperature range of the HBr desorption is ~ 465-530 °C in width (see Fig.…”

Microwave Properties of Composite Films Based on Polyvinyl Chloride and Brominated Activated Carbon

“…For AC/Br 2 and AC, the combustion process is completed at 850-900 °C. [24] The thermal stability of AC/Br 2 was also investigated by TGA in an argon atmosphere and by thermoprogrammed desorption mass spectrometry (TPD MS) in a vacuum medium. Figures 5a and b show the TG/DTG curves and temperature profiles obtained from the mass spectra for AC/Br 2 .…”

“…According to the data obtained, the surface of AC/Br 2 contains mainly chemisorbed bromine and CO-bearing centers, presumably phenolic groups. [24,27] The amount of CO 2 -bearing centers, such as carboxylic, anhydride, and lactone groups, on the surface of AC/ Br 2 is insignificant.…”

“…[23] The introduction of bromine, with its high electronegativity, into porous and layered carbon structures causes a change in the physical properties of the carbon solids. [24] For example, the large bromine atoms and ions increase the separation of graphitic layers and can drastically change the conductivity in carbon semiconductors. Typically, after bromination, the average free path of the charge carriers varies, changing the carrier mobility and the total conductivity.…”