Fabrication of highly sensitive porous AAO chemical sensors
首发时间:2012-12-25
Abstract:Anodic aluminum oxide (AAO) is a typical self-ordered porous material. Lowering the anodization voltage during the growth process, the pores will branch. To apply a periodic anodization voltage, one-dimensional porous Bragg stack with periodic pore density can be fabricated. By adjusting the pore density period properly, photonic band gap can be located in the visible light region, and the anodic aluminum oxide will display vivid strutural color. Immersing the anodic aluminum oxide in analyte, the structural color changes with the refractive index of analyte. In this paper, by employing a modified voltage-controlled anodization method and subsequent chemical etching process, chemical sensors made of porous AAO Bragg stacks with aluminum substrates are fabricated successfully. Compared with the similar ones reported before, this kind of sensors shows much higher sensitivity and possesses more rugged construction. The color changes between the analytes with relatively large difference in refractive index can be distinguished simply by the naked eyes.
keywords: anodic aluminum oxide bragg stacks chemical sensor
点击查看论文中文信息
高灵敏度多孔阳极氧化铝化学传感器的制备
摘要:阳极氧化铝是一种典型的自有序多孔材料。阳极氧化过程中降低电压,孔洞将分枝生长。施加周期性阳极氧化电压,可以制备出孔密度周期变化的一维布拉格堆垛。合理调节孔密度周期,光子带隙位于可见光区域,阳极氧化铝显示出结构色。当把阳极氧化铝浸入化学试剂中,结构色因折射率变化而变化。采用特定的周期性阳极氧化电压曲线并结合适当的化学腐蚀工艺,可以在铝基体上制备出了多孔阳极氧化铝布拉格堆垛化学传感器。与以往所报道同类传感器相比,这种传感器具有更高的灵敏度和更坚固的结构。对于折射率相差较大的化学试剂,传感器所展现的颜色变化可用裸眼区分。
基金:
论文图表:
引用
No.****
同行评议
共计0人参与
勘误表
高灵敏度多孔阳极氧化铝化学传感器的制备
评论
全部评论0/1000