tailieunhanh - Báo cáo hóa học: " Over 95% of large-scale length uniformity in template-assisted electrodeposited nanowires by subzero-temperature 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: Over 95% of large-scale length uniformity in template-assisted electrodeposited nanowires by subzero-temperature electrodeposition | Shin et al. Nanoscale Research Letters 2011 6 467 http content 6 1 467 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Over 95 of large-scale length uniformity in template-assisted electrodeposited nanowires by subzero-temperature electrodeposition Sangwoo Shin1 Bo Hyun Kong2 Beom Seok Kim1 Kyung Min Kim1 Hyung Koun Cho2 and Hyung Hee Cho1 Abstract In this work we report highly uniform growth of template-assisted electrodeposited copper nanowires on a large area by lowering the deposition temperature down to subzero centigrade. Even with highly disordered commercial porous anodic aluminum oxide template and conventional potentiostatic electrodeposition length uniformity over 95 can be achieved when the deposition temperature is lowered down to C. Decreased diffusion coefficient and ion concentration gradient due to the lowered deposition temperature effectively reduces ion diffusion rate thereby favors uniform nanowire growth. Moreover by varying the deposition temperature we show that also the pore nucleation and the crystallinity can be controlled. Keywords Cu nanowire template-assisted electrodeposition length uniformity low-temperature electrodeposition nucleation crystallinity Introduction Length uniformity in template-assisted electrodeposited nanowires is of great importance in realizing the nanowires as building blocks for various technological applications that specifically involve electron flow through the nanowires such as thermoelectric 1 2 spintronics 3 4 photovoltaics 5 interconnects 6 7 and phasechange memory devices 8 . In feasibility aspect template-assisted nanowires have an extraordinary advantage over other nanowires that are grown by different methods such as vapor-liquid-solid method 9 and elec-troless-etched method 10 11 . In detail the template can be readily used as a supporting matrix without any further fabrication process. Supporting matrix which is essential in fabricating .