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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Control of cluster synthesis in nano-glassy carbon films
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Control of cluster synthesis in nano-glassy carbon films

机译：纳米玻璃碳薄膜中簇合成的控制

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摘要

Carbon films were prepared by pulsed laser deposition (PLD), changing buffer gas nature and pressure and laser power density. Nanometer-sized cluster assembled (CA) films, resulting from direct aggregation of carbon clusters in the ablation plume, were obtained. Visible Raman spectroscopy shows that all films are trigonally co-ordinated and structurally disordered, with a dependence of the degree of disorder on the deposition parameters. The microstructure and morphology of the films were studied in a complementary way by scanning electron microscopy (SEM) both in plane and in cross-section, and by atomic force microscopy (AFM). Different growth modes are found in the deposited CA films, depending on the interplay of laser fluence and nature-pressure of the buffer gas. Threshold fluences of increasing value separate dense columnar growth from sponge like morphology, from an open dendritic structure. AFM pictures show that our glass-like carbon films consist of agglomerates of nanometer-sized clusters. Cluster formation in the plume is modeled, allowing to estimate the average number of carbon atoms per cluster. The calculated size of the clusters depends mainly on ambient gas pressure. Cluster sizes obtained by model predictions agree with those directly observed by transmission electron microscopy (TEM) imaging and with the deduced film coherence length from Raman spectroscopy conducted herein.
机译：通过脉冲激光沉积（PLD），改变缓冲气体的性质，压力和激光功率密度来制备碳膜。获得了纳米尺寸的簇组装（CA）薄膜，该薄膜是由烧蚀羽流中的碳簇直接聚集而成的。可见拉曼光谱表明，所有薄膜都是三角形配位的，并且在结构上是无序的，其无序度取决于沉积参数。通过平面和横截面扫描电子显微镜（SEM）以及原子力显微镜（AFM），以互补的方式研究了薄膜的微观结构和形态。在沉积的CA膜中发现了不同的生长模式，这取决于激光通量和缓冲气体的自然压力之间的相互作用。增加值的阈值注量将密集的柱状生长与海绵状形态从开放的树状结构中分离出来。 AFM图片显示，我们的玻璃状碳膜由纳米簇的团聚体组成。对羽状流中的团簇形成进行建模，从而可以估算每个团簇的平均碳原子数。群集的计算大小主要取决于环境气压。通过模型预测获得的簇大小与通过透射电子显微镜（TEM）成像直接观察到的簇大小以及本文进行的拉曼光谱推断的膜相干长度一致。

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