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|Title:||Structural engineering of nanoporous anodic alumina photonic crystals by sawtooth-like pulse anodization|
|Citation:||ACS Applied Materials and Interfaces, 2016; 8(21):13542-13554|
|Publisher:||American Chemical Society|
|Cheryl Suwen Law, Abel Santos, Mahdieh Nemati, and Dusan Losic|
|Abstract:||This study presents a sawtooth-like pulse anodization approach aiming to create a new type of photonic crystal structure based on nanoporous anodic alumina. This nanofabrication approach enables the engineering of the effective medium of nanoporous anodic alumina in a sawtooth-like manner with precision. The manipulation of various anodization parameters such as anodization period, anodization amplitude, number of anodization pulses, ramp ratio and pore widening time allows a precise control and fine-tuning of the optical properties (i.e., characteristic transmission peaks and interferometric colors) exhibited by nanoporous anodic alumina photonic crystals (NAA-PCs). The effect of these anodization parameters on the photonic properties of NAA-PCs is systematically evaluated for the establishment of a fabrication methodology toward NAA-PCs with tunable optical properties. The effective medium of the resulting NAA-PCs is demonstrated to be optimal for the development of optical sensing platforms in combination with reflectometric interference spectroscopy (RIfS). This application is demonstrated by monitoring in real-time the formation of monolayers of thiol molecules (11-mercaptoundecanoic acid) on the surface of gold-coated NAA-PCs. The obtained results reveal that the adsorption mechanism between thiol molecules and gold-coated NAA-PCs follows a Langmuir isotherm model, indicating a monolayer sorption mechanism.|
|Keywords:||Sawtooth-like pulse anodization; structural engineering; nanoporous anodic alumina; photonic crystals; reflectometric interference spectroscopy|
|Rights:||© 2016 American Chemical Society|
|Appears in Collections:||Chemical Engineering publications|
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