论文标题
在1200至2200 K范围内单个石墨和石墨烯纳米颗粒的O2氧化：粒子到粒子变化以及反应速率和光学特性的演变
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
论文作者
论文摘要
使用单个纳米颗粒质谱法，研究了在不同的氧部分压力下，研究了单个石墨和石墨烯血小板纳米颗粒（NP）的动力学。通过在动力学研究期间测量NP热发射光谱来测量NP温度（TNP）。发现最初的氧化效率在1200至1500 K范围内达到峰值，随着TNP的增加，氧化速率的NP-TO-NP变化很大，氧化速率的变化很大，这归因于NP表面结构的变化，因此下降了数量级。另外，随着NP的反应，氧化效率通过10到300之间的因素而非单位降低。反应性的演变归因于由于氧化和退火的结合而导致的NP表面结构的变化。光学特性，包括发射率的波长依赖性以及532 nm加热激光器的吸收横截面，也倾向于随着NP的氧化而演变，但对于每个单独的NP而言，也有所不同，大概反映了初始结构的差异，以及它们在不同反应条件下如何演变。
The kinetics for O2 oxidation of individual graphite and graphene platelet nanoparticles (NPs) were studied as a function of temperature (1200 to 2200 K) at varying oxygen partial pressures, using a single nanoparticle mass spectrometry method. NP temperature (TNP) was measured by measuring the NP thermal emission spectra during the kinetics studies. The initial oxidation efficiency is found to peak in the 1200 to 1500 K range, dropping by an order of magnitude as TNP was increased above 2000 K. There were large NP-to-NP variations in the oxidation rates, attributed to variations in the NP surface structure. In addition, the oxidation efficiencies decreased, non-monotonically, as the NPs reacted, by factors of between 10 and 300. This evolution of reactivity is attributed to changes in the NP surface structure due to the combination of oxidation and annealing. The optical properties, including wavelength dependence of the emissivity, and the absorption cross section for the 532 nm heating laser, also tend to evolve as the NPs oxidize, but differently for each individual NP, presumably reflecting differences in the initial structures, and how they evolve under different reaction conditions.
