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Atomic Level Analysis of Advanced Electronic Materials by the Scanning Atom Probe

利用扫描原子探针对先进电子材料进行原子水平分析

基本信息

批准号：
15310077
负责人：
TANIGUCHI Masahiro
金额：
$ 7.68万
依托单位：
KANAZAWA INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Various kinds of carbon materials such as graphite, vitreous carbon and carbon nano-tube (CNT) and silicon were analyzed by fully utilizing the unique capability of the scanning atom probe (SAP). The analysis revealed that these materials contain a large amount of hydrogen. Unexpected finding is that some CNT contain a significant amount of oxygen and is field evaporated as various cluster ions such as C_5, C_8 and C_<18>. The characteristic clusters suggest that the CNT is not field evaporated as a carbon chain but as nano-size graphene sheets reflecting their binding state. A silicon wafer was mechanically grooved forming silicon pyramids. Oxygen and aluminum were detected from the top corners of the pyramid. After the etching the pyramid with hydro-fluoric acid it was found that the uppermost silicon surface layer was covered by hydrogen. Based on these successful results, the study was extended to polymers and organic molecules such as polythiophene, crystal violet and tetra-butyl- … More ammonium. Many radical of polythiophene, SC_4H_2, were detected. This implies that the binding between atoms forming the radical is very strong. Mass spectra showed few fragment ions breaking double bonds. No isolated sulfur ion was detected. The theoretical study of polythiophene agrees well with the experimental result. Field emission characteristics indicates that the polythiophene is semiconductive. Accordingly, the present results indicates that the SAP not only allows to mass analyzes these materials at atomic level but also reveals the binding and electronics states of atoms forming materials. The mass analysis of crystal violet (CV) on tungsten and titanium oxide showed that CV is dissociated by photo-stimulated catalytic function of titanium oxide when the 2^<nd> harmonic wave of the YAG laser, wave length : 532 nm, because the absorption maximum of CV, 589 nm, is close to the illuminated laser light. Contrary, few tetra-butyl-ammonium molecules dissociated because it does not have absorption maximum. Characteristic fragmentaion of the molecules indicate the binding state of the molecules. No isolated nitrogen atom was detected. Less

充分利用扫描原子探针（SAP）的独特性能，对石墨、玻璃碳、碳纳米管（CNT）和硅等各种碳材料进行了分析。分析表明，这些材料含有大量的氢。出乎意料的是，一些CNT含有大量的氧，并且场蒸发为各种簇离子，如C_5，C_8和C_4<18>。特征簇表明CNT不是作为碳链场蒸发的，而是作为反映其结合状态的纳米尺寸的石墨烯片。将硅晶片机械开槽以形成硅金字塔。从金字塔的顶部角落检测到了氧和铝。用氢酸腐蚀金字塔后，发现最上面的硅表面层被氢覆盖。在此基础上，将研究范围扩展到聚噻吩、结晶紫、四丁基- ...更多信息铵的检测到聚噻吩的多种自由基SC_4H_2。这意味着形成自由基的原子之间的结合非常强。质谱显示很少有碎片离子断裂双键。未检测到孤立的硫离子。对聚噻吩的理论研究与实验结果吻合较好。场发射特性表明，聚噻吩是一种电子结构。因此，目前的结果表明，SAP不仅允许在原子水平上对这些材料进行质量分析，而且还揭示了形成材料的原子的结合和电子状态。对钨和钛氧化物上结晶紫（CV）的质量分析表明，当YAG激光的2倍频<nd>波长为532 nm时，由于CV的最大吸收波长为589 nm，与照射的激光接近，CV在钛氧化物的光激励催化作用下解离。相反，很少有四丁基铵分子解离，因为它没有吸收最大值。分子的特征断裂指示分子的结合状态。未检测到孤立的氮原子。少