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Fabrication of Electrodeposited Anodic Alumina Photonic Crystal and the Application on Camouflage Materials

Author: PuYanJun
Tutor: HuXing
School: South China University of Technology
Course: Microelectronics and Solid State Electronics
Keywords: Anodic Alumina Photonic Crystal Deposition Camouflage Materials
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 162
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Abstract


Anodic Aluminum Oxide (AAO) has been one of the most frequently used templates for synthesizing nanomaterials, as it is characterized by both controllable pore diameter plus film thickness and its simple fabrication technology. Through periodic voltage or current function, yielding periodic, multi-layer and branched AAO could be a possible, i.e. anodic alumina photonic crystal. By virtue of its periodic microstructure adjustment, a proper design could bring photonic crystal with highly controlled reflection spectra, which might be used to simulate standard green cloaking spectrum, making an accomplishment on cloaking during visible light and near infrared wave band. In addition, reflection from Al substrate could be modulated via metallic nano-particles deposited anodic alumina, by which the spectra range of photonic crystal could tremendously be enlarged, and its structural color could also be visible with Al substrate.Initially, anodic alumina photonic crystal was prepared by both voltage and current controlled anodization. As for voltage controlled anodization, red shift was observed in transmission spectra of photonic crystal with both increasing anodizing time and benchmark anodic voltage. In the meantime, transmission spectra of anodic alumina photonic crystal could vastly be modulated under different benchmark anodic voltages. As for current controlled anodization, both blue shift and an increasing peak width were found in transmission spectra of anodic alumina photonic crystal with increasing periodicity. Compared with voltage controlled anodization, the current controlled anodization could better control spectra features of anodic alumina photonic crystal in such areas as transmission peak position, width and so forth.Then, reflection from Alumina/Al interface was strongly suppressed by metallic nano-particles deposited anodic alumina, because of which a wide range of vivid color of photonic crystal was visible with Al substrate. Research work indicated that Sn/Ni deposition had a better effect on interface reflection suppression than Ag deposition. Moreover, the color of Sn/Ni deposited anodic alumina photonic crystal with Al substrate observed ranged from blue to red.In order to simulate standard green cloaking spectrum during visible light and near infrared wave band, some kind of anodic alumina photonic crystal featuring periodic, multi-layer and branched structure was fabricated by two independent anodization processes. As to the first anodization process for near infrared wave band simulation, reflection peak intensity was reduced via anodizing periodicity modulation. Reflection peak position and width were controlled by adjusting both starting time and finishing time in each periodicity during anodization. The second anodization process was for visible light simulation. A reflection spectrum of photonic crystal similar to standard curve was successfully achieved. Both position and intensity of the reflection peak characterized a favorable match. Besides, transmission and reflection spectra of AAO under different anodizing conditions during visible light, near, intermediate and far infrared wave band were studied. Emissivity of different kinds of materials was calculated. Results indicated both anodic alumina with Al substrate and Sn/Ni deposited anodic alumina with Al substrate held a possession of lower infrared emissivity.

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