Synthesis and functionality of nano-carbon thin films grown by surface precipitation

表面沉淀生长纳米碳薄膜的合成与功能

• 批准号: 18560707
• 负责人: FUJITA Daisuke
• 金额: $ 2.57万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560707/
• 关键词: solid solution; surface precipitation; nano carbon; nano wire; nano belt; graphene; scanning tunneling microscopy; scanning Aueer microscopy; ナノドット; 走査型プローブ顕微鏡; 原子間力顕微鏡

Synthesis of low-dimensional nano-carbons by using surface precipitation of dissolved carbon dopants is a novel fabrication method for nano-carbons without an external carbon source (Fujita et al, 2003, JJAP). It is required for us to control the variation of nano-carbons, based on the growth mechanism. The objective of the research is to clarify the growth mechanism on carbon-doped metal substrates by using surface nanocharacterization techniques, establish the method for synthesis and control of nano-carbons, and to explore the novel functionalities and applications. As for the specimens, various carbon-doped metals (mono-crystalline C-Ni (111), poly-crystalline C-Ni, C-Pt, C-Co, etc.) were prepared Carbon doping up to about 0.3 at% was performed by solid-state diffusion in vacuum at the elevated temperature. After polished and cleaned, the samples were heat-treated in UHV to fabricate nano-carbon films on the substrates, which were characterized by scanning probe microscopy (SPM) an … More d scanning Auger microscopy (SAM). In the case of C-Ni (111), it was found that different nanostructures appeared on the surfaces depending on the heat treatments (rapid cooling or gradual cooling).As for the gradual cooling, we discovered low-dimensional carbon nanostructures such as nanodots, nanowires, nanobelts, nano-crevices, Moire patterns, and superstructures, which were grown on multi-layer graphite terraces. The observations gave us good suggestions to clarify the growth mechanism. The similar carbon nanowires were also discovered on the freshly cleaved surfaces of HOPG (JJAP, 2007). It is understood that nucleation and growth of rolled graphen sheets, or carbon nanowires, may occur at surface defects such as step edges and atomic vacancies, generated by the stress and strain. In the caw of rapid cooling, initial nucleation of nano-carbons and monolayer graphite were observed. As for applications, we have demonstrated the uses for re-usable high-resolution STM tips and for reference materials for AFM tip-shape characterization. We have obtained the similar results for C-doped Co. In the case of a C-doped Pt sample, we have succeeded in the synthesis of monolayer graphene film with large area. Less

利用溶解碳掺杂剂的表面沉淀法合成低维纳米碳是一种无需外部碳源的新型纳米碳制备方法（Fujita et al ., 2003， JJAP）。从纳米碳的生长机理出发，控制纳米碳的变化是我们所需要的。本研究的目的是通过表面纳米表征技术来阐明碳掺杂金属衬底上的生长机理，建立纳米碳的合成和控制方法，并探索纳米碳的新功能和应用。在样品中制备了多种掺杂碳的金属（单晶C-Ni（111）、多晶C-Ni、C-Pt、C-Co等），并在真空中高温固相扩散掺杂了约0.3 at%的碳。样品经过抛光和清洗后，在特高压下进行热处理，在衬底上制备纳米碳膜，并通过扫描探针显微镜（SPM）和扫描俄歇显微镜（SAM）对其进行了表征。在C-Ni（111）的情况下，发现不同的热处理（快速冷却或逐渐冷却）在表面上出现不同的纳米结构。在逐渐冷却过程中，我们发现了生长在多层石墨梯田上的低维碳纳米结构，如纳米点、纳米线、纳米带、纳米裂缝、云纹图案和上层结构。这些观察结果为我们阐明生长机制提供了很好的建议。在新切割的HOPG表面也发现了类似的碳纳米线（JJAP, 2007）。据了解，石墨烯或碳纳米线的成核和生长可能发生在表面缺陷，如台阶边缘和原子空位，由应力和应变产生。在快速冷却条件下，观察到纳米碳和单层石墨的初始形核。至于应用，我们已经展示了可重复使用的高分辨率STM尖端和AFM尖端形状表征的参考材料的用途。对于掺杂c的Co，我们也得到了类似的结果。对于掺杂c的Pt样品，我们成功地合成了大面积的单层石墨烯薄膜。少

项目成果

ナノ創製のためのナノ計測技術

用于纳米创造的纳米测量技术

• 发表时间: 2007
• 期刊: 電子材料 46・2
• 作者: 大西桂子;藤田大介;藤田大介
• 通讯作者: 藤田大介

Characterization of C60 Nano-Whiskers by Atomic Force Microscopy

通过原子力显微镜表征 C60 纳米晶须

• 发表时间: 2008
• 作者: D.Fujita,M.Xu,K.Onishi;and K.Miyazawa
• 通讯作者: and K.Miyazawa

Carbon nanowires spontaneously formed on the surface of a freshly cleaved HOPG wafer

碳纳米线在新切割的 HOPG 晶圆表面自发形成

• 发表时间: 2007
• 期刊: Japanese Journal of Applied Physics 46
• 作者: M. Xu;Y. Pathak;D. Fujita;C. Ringor;K. Miyazawa;X.L.Guo and D.Fujita
• 通讯作者: X.L.Guo and D.Fujita

Novel Nano-carbons Synthesized by Surface Precipitation in Ultrahigh Vacuum

超高真空表面沉淀合成新型纳米碳

• 发表时间: 2007
• 作者: D. Fujita;T. Kumakura;K. Onishi;K. Sagisaka;D.Fujita,T.Kumakura,K.Onishi,Y.Yu and K.Sagisaka;D.Fujita,K.Onishi,K.Sagisaka and T.Kumakura
• 通讯作者: D.Fujita,K.Onishi,K.Sagisaka and T.Kumakura

Novel Nano-carbons Synthesized by Surface Precipitation in Ultrahigh Vacuum/Novel Nano-carbons Synthesized by Surface Precipitation in Ultrahigh Vacuum

超高真空表面沉淀合成新型纳米碳/超高真空表面沉淀合成新型纳米碳

• 发表时间: 2007
• 作者: D. FUJITA;K. ONISHI;K. SAGISAKA;T. KUMAKURA
• 通讯作者: T. KUMAKURA