Triple-probe Atomic Force Microscope: Measuring a carbon nanotube/DNA MIS-FET
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Triple-probe Atomic Force Microscope: Measuring a carbon nanotube/DNA MIS-FET Kei Shimotani, Hiroyuki Watanabe, Chikara Manabe, Taishi Shigematsu, and Masaaki Shimizu Ecology Research Lab., Corporate Research Laboratory, Fuji Xerox Co., Ltd. 430, Sakai, Nakai, Ashigarakami, Kanagawa, 259-0157, Japan ABSTRACT We have constructed an advanced electric probing system, which is a triple-probe atomic force microscope (T-AFM). The T-AFM consists of "Nanotweezers" and an AFM with a carbon nanotube probe. Using this system, we fabricated a single-walled carbon nanotubes (SWNTs)/deoxyribonucleic acid (DNA) three-terminal device and measured the current-voltage (I-V) curves of this device. In this three-terminal device, DNA strands were entangled with the SWNT bundle, and behaved as a gate-insulator-layer. This three-terminal device worked as a metal-insulator-semiconductor field effect transistor (MIS-FET) with depletion switching behavior. INTRODUCTION Scanning probe microscope (SPM) [1, 2] has been contributed toward realizing the molecular electronics. Further, in order to advance molecular devices and circuits, we need to develop an advanced measuring system, which can manipulate and measure the nanometer-scale samples. Then, we developed a triple-probe atomic force microscope (T-AFM) [3]. The T-AFM, which has three probes, can measure electric properties of nanometer-scale samples with three electrodes and manipulate the samples. We have shown that the T-AFM has been a promising apparatus for nanotechnology by measuring current-voltage (I-V) curves of a carbon nanotube ring and a single DNA molecule [3]. In this study, using T-AFM, we fabricated a single-walled carbon nanotubes (SWNTs)/deoxyribonucleic acid (DNA) three-terminal device in order to realize the molecular device. Then, we investigated the electric properties of the three-terminal device. EXPERIMENT Figure 1(a) shows the schematic of the T-AFM system, which is composed of "Nanotweezers" [4] (Fig.1 (b)) and a conventional AFM system with a carbon nanotube (CNT) AFM probe (Fig.1(c)). The nanotweezers have two multi-walled carbon nanotubes (MWNTs, diameter ~8 nm) which were connected with glass needle (the apex
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