tailieunhanh - Báo cáo hóa học: " Fabrication of functional micro- and nanoneedle electrodes using a carbon nanotube template and electrodeposition"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Fabrication of functional micro- and nanoneedle electrodes using a carbon nanotube template and electrodeposition | An et al. Nanoscale Research Letters 2011 6 306 http content 6 1 306 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Fabrication of functional micro- and nanoneedle electrodes using a carbon nanotube template and electrodeposition Taechang An1 WooSeok Choi1 Eunjoo Lee2 In-tae Kim1 Wonkyu Moon1 and Geunbae Lim1 3 Abstract Carbon nanotube CNT is an attractive material for needle-like conducting electrodes because it has high electrical conductivity and mechanical strength. However CNTs cannot provide the desired properties in certain applications. To obtain micro- and nanoneedles having the desired properties it is necessary to fabricate functional needles using various other materials. In this study functional micro- and nanoneedle electrodes were fabricated using a tungsten tip and an atomic force microscope probe with a CNT needle template and electrodeposition. To prepare the conductive needle templates a single-wall nanotube nanoneedle was attached onto the conductive tip using dielectrophoresis and surface tension. Through electrodeposition Au Ni and polypyrrole were each coated successfully onto CNT nanoneedle electrodes to obtain the desired properties. Introduction With the development of nanotechnology the demand for information about microscale systems has increased 1 2 . Micro- and nanoneedle electrodes provide opportunities for electrochemical and biological studies of microenvironments such as scanning electrochemical microscopy SECM 3-5 and single-cell analysis 6-8 . For example a nanoneedle with a high aspect ratio and small diameter can be used as both an injection 9 and manipulation tool 6 10 for biomolecules and nanoparticles in a living cell. A nanoneedle with a functional surface such as metal oxide can be used as an intracellular sensor to monitor an intracellular environment 11 . Furthermore a nanoneedle electrode coated with an insulation layer can be used as an SECM probe to measure .