Synthesis with Electroless Plating and Characterization of Metal Inverse Opals
Date Issued
2007
Date
2007
Author(s)
Hsueh, Han-Yu
DOI
zh-TW
Abstract
Construct dielectric materials with different refractive indexes to stack and to form two - dimensional or three - dimensional of periodic nanostructures. Such unique structures have characteristic photonic band gaps, and can control and manipulate the flow of light. We call the structures be photonic crystal. Consequently, photonic crystals are of great interest in applied research and lead to broad applications, like tunable optical filters, photonic crystal fiber, light emitting diode, sensor, etc. The research of photonic crystal is really an important science.
One of the most researched structures in the laboratories is opals and inverse opals. The purpose of this article is to emphasize the synthesis in nickel inverse opals. According to references up to the present, electronic deposition and sintering are the methods used principally. However, the method of electronic deposition needs complicated equipment and takes longer time. The method of sintering would destroy the structures. We found a new method to fill nickel nanoparticles into interspace between polystyrene spheres. Experimental steps of fabricating the macroporous structure are described as follow: At first, make the glass template sensitized and activated, and palladium particles would cover the glass template to form catalytic sites. By evaporation, polystyrene spheres would align on the glass template to form three-dimensionally ordered opals. The diameter of polystyrene spheres is 550 nm. Put this template with polystyrene into the plating solution. At adequate temperature, nickel reduces from the surface of palladium and grows up to the top of colloidal crystal. Finally, use THF to take off polystyrene spheres, and we could get the structure of inverse opals. In different period of time, we could get nickel inverse opals with different thickness. By this method, we can synthesis metal inverse opals having large and unbroken areas without any expensive equipment. It’s really a convenient technology.
SEM is carried out to observe the structure of Ni inverse opals. X-ray is used to confirm the lattice ,and ultraviolet ray is used to measure the band gap. Measure electronic conductivity with digital panel meter and 4 Point Probe .
Subjects
無電電鍍
光子晶體
蛋白石結構
鎳
聚苯乙烯
photonic crystal
opals
electroless plating
nickel
polystyrene
Type
thesis
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