Development of measurement system for opt-electronic properties of nano-material using nanotube nanotweezers

在这项研究中，我们提出了一种使用碳注释的多功能纳米加工工具，它由带有光纤尖端的纳米铲子组成。纳米工具使我们能够研究纳米材料的光学和电学性质1.我们开发了针对单个纳米管的纳米加工技术，利用在扫描电子显微镜(SEM)中结合机械手的纳米工厂来制造纳米工具。多壁纳米管(MWNTs)的焦耳加热处理对于纳米管尖端的磨尖、长度的调整、外壳的剥离和内层的提取都是非常有用的。阐明了MWNTs的基本性质，如MWNTs层间的纳米摩擦学特性、层与层之间的导电特性等。我们还发现，在电流作用下，电子束照射在纳米管与电极之间的接触处，导致了接触电阻的提高。为了研究纳米材料的发光特性，在纳米工厂安装了一套由致冷电荷耦合器件和单色仪组成的光学测量系统。这使得我们能够测量出MWNTs的升华温度估计在2500K左右。此外，在外加电场的同时，还观察到了加热后的多壁碳纳米管的热离子发射。因此，纳米管应该被用作微小的白光光源、热源和电子发射器。3.展示了一种使用组装在光学薄膜尖端上的纳米工具的原子力显微镜。我们还成功地将环状的纳米管连接到光纤尖端。该装置可作为原子力显微镜操作中的纳米光源

In that research, we have proposed a multifunctional nano-processing tool using carbon annotates, which consists of nanotweezers with an optical fiber tip. The nano-tool enables us to investigate the optical and the electrical properties of the nanoscale materials1.We have developed nano-processing technique for individual nanotubes to fabricate the nanotools using a "nanofactory" which incorporated manipulators in a scanning electron microscope (SEM). Processing by Joule heating of individual multiwall nanotubes (MWNTs) was very useful for sharpening of a nanotube tip, length adjustment, exfoliation of outer shell and extraction of inner-layers. These were also clarified about the fundamental properties of MWNTs, such as nano-tribology for interlayer of the MWNTs, the electrical conduction characteristics between layers, etc. We have also found that the electron beam irradiation at the contact between the nanotube and the electrode under current flow induced the improvement of the contact resistance.2. In order to investigate the light emission properties of the nanomaterials, an optical measurement system, which consisted of a cooled CCD and a monochromator, was installed in the nanofactory. This enabled us to measure a sublimation temperature of the MWNTs were estimated to be in the range around 2500K. Furthermore, the thermoionic emissions from the heated MWNT was also observed under external electric field simultaneously. Thus, the nanotube should be used as the minute white light source, heat source, and electron emitter.3.An atomic force microscopy using the fabricated nanotools attached on the optical filber tip was demonstrated. We have also succeeded in nanotube attachment of the loop shape to the optical fiber tip. This device can be used as a nano light source in the AFM operation