Abstract
An efficient application of fast remote diagnostics for carbon material (CM) bulk particles was demonstrated. Porous layers of CM particles with different oxidation levels were characterized by self-action of picosecond laser pulses at 1064 nm. Nitrogen adsorption, Boehm titration, and thermal analysis of the oxidized CMs revealed diverse specific surface area \(S_\mathrm {BET}\), reasonable surface acidity, and high concentration of surface oxygen-containing groups. Dense CM porous layers showed a monotonous reduction of the absorptive nonlinear optical (NLO) response efficiency versus the oxidation level with characteristic magnitude Im(\(\chi _\mathrm{C}^{(3)})\sim 10^{-10}\) esu for the carbon particles fraction. The obtained Im(\(\chi _\mathrm{C}^{(3)})/S_\mathrm {BET}\) ratio remains approximately constant, which indicates the certain proportion between the absorptive NLO response efficiency and the specific surface area. We suggest to use Im(\(\chi _\mathrm{C}^{(3)})\) as a figure of merit for carbons subjected to the oxidation—the route to enhance the CM surface reactivity.
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