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arXiv 1303.6364cond-mat.mes-hall
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磁性衬底上的超薄热解碳膜

Ultrathin Pyrolytic Carbon Films on a Magnetic Substrate

Ahmad Umair, Tehseen Z. Raza, Hassan Raza

摘要:

报道了在1000 °C甲烷气氛下,用化学气相沉积法在镍基片上生长热解碳(PyC)薄膜的研究。我们发现,超快速冷却是至关重要的PyC膜的均匀性,通过控制偏析的碳在镍上。我们用拉曼光谱表征了PyC薄膜的面内晶体尺寸。在~1354 cm-1和~1584 cm-1波数处的拉曼峰用于提取D和G带。然后在依赖于激发能的方程中使用相应的峰强度来计算面内晶体尺寸。使用拉曼面积映射,在100 μm ${\times}$ 100 μm的面积上的面内晶体尺寸的平均值约为22.9 nm,标准偏差约为2.4 nm。

英文摘要:

We report the growth of ultrathin pyrolytic carbon (PyC) films on nickel substrate by using chemical vapor deposition at 1000 °C under methane ambience. We find that the ultra-fast cooling is crucial for PyC film uniformity by controlling the segregation of carbon on nickel. We characterize the in-plane crystal size of PyC film by using Raman spectroscopy. The Raman peaks at ~1354 cm-1 and ~1584 cm-1 wavenumbers are used to extract the D and G bands. The corresponding peak intensities are then used in an excitation energy dependent equation to calculate the in-plane crystal size. Using Raman area mapping, the mean value of in-plane crystal size over an area of 100 μm ${\times}$ 100 μm is about 22.9 nm with a standard deviation of about 2.4 nm.

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