论文标题
单个石墨和石墨烯纳米颗粒（NP）的升华动力学：NP-TO-NP变化以及不断发展的结构 - 运动和结构发射关系
Sublimation Kinetics for Individual Graphite and Graphene Nano-particles (NPs): NP-to-NP Variations and Evolving Structure-Kinetics and Structure-Emissivity Relationships
论文作者
论文摘要
单个纳米颗粒（NP）质谱法用于测量许多单个石墨和石墨烯NP的纳米颗粒温度（TNP）的函数。最初，NP升华率为大约。对于散装石墨的速度要快400倍，并且NP到NP的变化很大。随着时间的流逝，速率大大放缓，尽管保持远高于大容量率。初始激活能（EAS）相应地低，并翻了一番，因为从表面升华了一些单层物质的价值。高初始速率和低EAS归因于NP表面上的大量边缘和其他低配位位点，并且通过优惠稳定位点的优先升华，变化归因于表面的原子尺度“平滑”。加热后NP的发射率也发生了变化，最常见的是增加。发射率和升华率是抗相关性的，得出的结论是，NP表面上的低调位点的高密度可增强升华，但抑制了发射率。
A single nanoparticle (NP) mass spectrometry method was used to measure sublimation rates as a function of nanoparticle temperature (TNP) for a number of individual graphite and graphene NPs. Initially, the NP sublimation rates were ca. 400 times faster than that for bulk graphite, and there were large NP-to-NP variations. Over time, the rate slowed substantially, though remaining well above the bulk rate. The initial activation energies (Eas) were correspondingly low and doubled as a few monolayer's worth of material were sublimed from the surfaces. The high initial rates and low Eas are attributed to large numbers of edge and other low coordination sites on the NP surfaces, and the changes are attributed to atomic-scale "smoothing" of the surface by preferential sublimation of the less stable sites. The emissivity of the NPs also changed after heating, most frequently increasing. The emissivity and sublimation rates were anti-correlated, leading to the conclusion that high densities of low-coordination sites on the NP surfaces enhances sublimation but suppresses emissivity.
