کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
702390 | 891096 | 2007 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: CVD growth and field emission characteristics of nano-structured films composed of vertically standing and mutually intersecting nano-carbon sheets CVD growth and field emission characteristics of nano-structured films composed of vertically standing and mutually intersecting nano-carbon sheets](/preview/png/702390.png)
Nano-structured films composed of rather flat nano-carbon sheets which roughly stood vertically on Si wafers and which intersected each other at large angles were grown by means of a high-power microwave-plasma chemical-vapour-deposition (MWPCVD) method. The structure of the fabricated films was investigated using scanning electron microscopes and Raman spectroscopy. Field emission (FE) currents obtained from these films reached 50 mA/cm2 at a macroscopic electric field of 3.6 V/μm. The observed FE characteristics were analyzed using a modified Fowler–Nordheim (F–N) equation where the field enhancement factor and effective emission area were treated as field-dependent parameters. It was found from the analysis that the vertically standing nano-carbon flat sheets had larger field enhancement factors and less FE areas, compared with those obtained for wrinkled nano-carbon sheets previously reported by the authors. It is suggested that the observed variations in the FE current without saturation behavior as a function of the macroscopic electric field can be explained in terms of an effective surface geometry phenomenon of the concerned films.
Journal: Diamond and Related Materials - Volume 16, Issue 3, March 2007, Pages 589–593