Lee Kwang Hong, Lim Xin Yuan, Wai Kah Wing, Romanato Filippo, Wong Chee Cheong
School of Materials Science and Engineering, Nanyang Technological University, Singapore, 50 Nanyang Avenue, 639798 Singapore.
J Nanosci Nanotechnol. 2011 Feb;11(2):1147-53. doi: 10.1166/jnn.2011.3097.
In order to form tapered nanocapillaries, we investigated a method to vary the nanopore diameter along the porous anodic alumina (PAA) channels using multi-step anodization. By anodizing the aluminum in either single acid (H3PO4) or multi-acid (H2SO4, oxalic acid and H3PO4) with increasing or decreasing voltage, the diameter of the nanopore along the PAA channel can be varied systematically corresponding to the applied voltages. The pore size along the channel can be enlarged or shrunken in the range of 20 nm to 200 nm. Structural engineering of the template along the film growth direction can be achieved by deliberately designing a suitable voltage and electrolyte together with anodization time.
为了形成锥形纳米毛细管，我们研究了一种使用多步阳极氧化法沿多孔阳极氧化铝（PAA）通道改变纳米孔径的方法。通过在单酸（H3PO4）或多酸（H2SO4、草酸和H3PO4）中对铝进行阳极氧化，并增加或降低电压，可以使沿PAA通道的纳米孔直径根据施加的电压系统地变化。沿通道的孔径可以在20纳米至200纳米的范围内扩大或缩小。通过精心设计合适的电压、电解质以及阳极氧化时间，可以实现沿膜生长方向对模板的结构工程设计。
