单个石墨和石墨烯纳米颗粒（NPs）的升华动力学：NP-to-NP变化和演变的结构-动力学和结构-Ehrmann关系
Sublimation Kinetics for Individual Graphite and Graphene Nano-particles (NPs): NP-to-NP Variations and Evolving Structure-Kinetics and Structure-Emissivity Relationships
摘要：
使用单个纳米颗粒（NP）质谱法来测量作为多个单独石墨和石墨烯NP的纳米颗粒温度（TNP）的函数的升华速率。最初，NP升华速率为约1.5。比块状石墨快400倍，并且存在大的NP到NP变化。随着时间的推移，速率大幅放缓，但仍远高于整体速率。初始活化能（Eas）相应地较低，并且随着几个单层的材料从表面升华而加倍。高的初始速率和低的Eas归因于大量的边缘和其他低配位的NP表面上的网站，和变化归因于原子尺度的“平滑”的表面通过优先升华的不太稳定的网站。纳米颗粒的发射率在加热后也发生了变化，最常见的是增加。的发射率和升华率是反相关的，导致的结论是，NP表面上的低配位位点的高密度增强升华，但抑制发射率。
英文摘要：
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.
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