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The kinetics for O2 oxidation of individual graphite and graphene plateletnanoparticles (NPs) were studied as a function of temperature (1200 to 2200 K)at varying oxygen partial pressures, using a single nanoparticle massspectrometry method. NP temperature (TNP) was measured by measuring the NPthermal emission spectra during the kinetics studies. The initial oxidationefficiency is found to peak in the 1200 to 1500 K range, dropping by an orderof magnitude as TNP was increased above 2000 K. There were large NP-to-NPvariations in the oxidation rates, attributed to variations in the NP surfacestructure. In addition, the oxidation efficiencies decreased,non-monotonically, as the NPs reacted, by factors of between 10 and 300. Thisevolution of reactivity is attributed to changes in the NP surface structuredue to the combination of oxidation and annealing. The optical properties,including wavelength dependence of the emissivity, and the absorption crosssection for the 532 nm heating laser, also tend to evolve as the NPs oxidize,but differently for each individual NP, presumably reflecting differences inthe initial structures, and how they evolve under different reactionconditions.

O2-Oxidation of Individual Graphite and Graphene Nanoparticles in the  1200 to 2200 K Range: Particle-to-Particle Variations and the Evolution of  the Reaction Rates and Optical Properties