Synthesis of few layer single crystal graphene grains on platinum by chemical vapour deposition

来源 :Progress in Natural Science:Materials International | 被引量 : 0次 | 上传用户:cedzyh
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The present competition of graphene electronics demands an ef fi cient route which produces high quality and large area graphene. Chemical vapour deposition technique, where hydrocarbons dissociate in to active carbon species and form graphene layer on the desired metal catalyst via nucleation is considered as the most suitable method. In this study, single layer graphene with the presence of few layer single crystal graphene grains were grown on Pt foil via chemical vapour deposition. The higher growth temperature changes the surface morphology of the Pt foil so a delicate process of hydrogen bubbling was used to peel off graphene from Pt foil samples with the mechanical support of photoresist and further transferred to Si O2/Si substrates for analysis. Optical microscopy of the graphene transferred samples showed the regions of single layer along with different oriented graphene domains. Two type of interlayer stacking sequences, Bernal and twisted, were observed in the graphene grains.The presence of different stacking sequences in the graphene layers in fl uence the electronic and optical properties; in Bernal stacking the band gap can be tunable and in twisted stacking the overall sheet resistance can be reduced. Grain boundaries of Pt provides low energy sites to the carbon species, therefore the nucleation of grains are more at the boundaries. The stacking order and the number of layers in grains were seen more clearly with scanning electron microscopy. Raman spectroscopy showed high quality graphene samples due to very small D peak. 2D Raman peak for single layer graphene showed full width half maximum(FWHM) value of 30 cm-1. At points A, B and C, Bernal stacked grain showed FWHM values of 51.22, 58.45 and 64.72 cm-1, while twisted stacked grain showed the FWHM values of 27.26, 28.83 and 20.99 cm-1,respectively. FWHM values of 2D peak of Bernal stacked grain showed an increase of 20–30 cm-1 as compare to single layer graphene which showed its dispersive nature and con fi rmed Bernal sequence. On the other hand, the slightest decrease in FWHM values of 2D peak in twisted grain comparing to single layer con fi rmed the twisted sequence of grains. Atomic force microscopy analysis showed an increasing trend in grain height pro fi le with an increase in the number of layers. The present competition of graphene electronics demands an ef fi cient route which produces high quality and large area graphene. Chemical vapor deposition technique, where hydrocarbons dissociate in to active carbon species and form graphene layer on the desired metal catalyst via nucleation is the as the most suitable method. In this study, single layer graphene with the presence of few layer single crystal graphene grains were grown on Pt foil via chemical vapor deposition. The higher growth temperature changes the surface morphology of the Pt foil so one. used to peel off graphene from Pt foil samples with the mechanical support of photoresist and further transferred to Si O2 / Si substrates for analysis. Optical microscopy of the graphene transferred samples showed the regions of single layer along with different oriented graphene domains. Two type of interlayer stacking sequences, Bernal and twisted, were observed in the graphene grai n. The presence of different stacking sequences in the graphene layers in fl uence the electronic and optical properties; in Bernal stacking the band gap can be tunable and in twisted stacking the overall sheet resistance can be reduced. Grain boundaries of Pt provides low energy sites to the carbon species, therefore the nucleation of grains are more at the boundaries. The stacking order and the number of layers in grains were seen more clearly with scanning electron microscopy. Raman peak for single layer graphene showed full width half maximum (FWHM) value of 30 cm-1. At points A, B and C, Bernal stacked grain showed FWHM values ​​of 51.22, 58.45 and 64.72 cm- the FWHM values ​​of 27.26, 28.83 and 20.99 cm-1, respectively. FWHM values ​​of 2D peak of Bernal stacked graph showed an increase of 20-30 cm-1 as compare to single layer graphene which showed its dispersive na ture and con fi rmed Bernal sequence. On the other hand, the slightest decrease in FWHM values ​​of 2D peak in twisted grain comparing to single layer con fi rmed the twisted sequence of grains. Atomic force microscopy analysis showed an increasing trend in grain height pro fi le with an increase in the number of layers.
其他文献
The high electron mobility has granted indium arsenide(InAs) nanowires(NWs) as an important class of nanomaterials for high performance electronics such as fiel
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
60年前有一本专门倡导宪政运动、传播宪政观念的刊物,叫《宪政》(月刊)。它创刊于1944年(中华民国三十三年)元旦,终止年月不详。发行人为黄炎培先生,主编为张志让先生。1943
在山东省直机关2009年上半年老干部工作大检查时,山东老年大学的老干部工作得到了检查组的高度评价。山东老年大学新一届领导班子到任后,中共山东省委老干部 In the inspect
因打虎.武松出了名.在民间成了名副其实的打虎英雄。进入虎年.看过电视连续剧《水浒传》.目然想起武松打虎。当初在山下.酒家对武松实情相告:景阳冈有虎.且常害人性命。可武松不退却
<正>走进当代中国的宪政理论,可以发现,学者们聚焦的主要对象,是整体性的国家权力;更具体地说,学者们更关注的是全国性的中央政权机构,尤其是这些机构的价值取向、相互关系、
管理是企业的一项基础工作,又是企业改革的主要内容。作为乡镇企业如果管理体制和运行方法依旧按照原有方式运作,就难以适应社会主义市场经济的要求。因此,企业应从转换经营
1993年,我们修建某县城开发区的水泥道路,路面宽7m,路两边砌筑60cm(宽)×100 cm(深)的毛石方沟排水。设计要求方沟盖板与水泥道路的混凝土一次浇筑成型。按以往的作法,要在
《幼儿园教育指导纲要(试行)》(以下简称《纲要》)明确指出:“幼儿园必须把保护幼儿的生命和促进幼儿的健康放在工作的首位。”著名的儿童教育家陈鹤琴也明确提出幼儿园应把