Structure of amorphous carbon films deposited on Ni nanoparticles under ultrahigh vacuum at room temperature
Structure of amorphous carbon films deposited on Ni nanoparticles under ultrahigh vacuum at room temperature
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DOI：
10.1002/sia.6080
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发表时间：
2016-11-01
影响因子：
1.7
通讯作者：
Saito, Yahachi
中科院分区：
文献类型：
--
作者：
Asaka, Koji;Saito, Yahachi
我们展示了室温下沉积在镍纳米颗粒清洁表面上的非晶碳（a-C）薄膜的透射电子显微镜和拉曼光谱。在Ni纳米颗粒上的a-C薄膜上测量的拉曼光谱中，D和G模式的宽峰分别出现在1388和1582cm（-1）处。对单个Ni纳米粒子上的a-C膜的高分辨率图像和相应的滤波逆快速傅里叶变换图像表明，未经热处理的a-C膜仅在Ni纳米粒子周围形成了结构类似于炭黑的无序石墨层。目前的观察表明，在室温下，a-C在Ni纳米颗粒的清洁表面发生自发石墨化。版权所有：John Wiley & Sons， Ltd。
We present transmission electron microscopy and Raman spectroscopy of amorphous carbon (a-C) films deposited on clean surfaces of nickel (Ni) nanoparticles at room temperature. In the Raman spectrum measured from the a-C film on the Ni nanoparticles, the broad peaks of the D and G modes appeared at 1388 and 1582cm(-1), respectively. The high-resolution images and the corresponding filtered inverse fast Fourier transformed images of the a-C film on the individual Ni nanoparticles showed that the a-C film only around the Ni nanoparticles formed disordered graphitic layers, similar in structure to carbon black, without heat treatment. The present observation suggests that spontaneous graphitization of a-C on the clean surfaces of the Ni nanoparticles occurs at room temperature. Copyright (c) 2016 John Wiley & Sons, Ltd.