| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 90 === GRIN plastic rods were fabricated by the method of centrifugal diffusing polymerization. Silver nanoparticles and diphenyl sulfide (DS) were used as non-reactive high refractive index monomers and methyl methacrylate (MMA) was used as a reactive low refractive index monomer; azobisisobutyronitrile (AIBN) was used as an initiator in this investigation.
The silver nanoparticles were prepared in AOT/isooctane/H2O and AOT/MMA/H2O reverse micellar systems. Dependence of parameters on the UV absorption spectra and the nanoparticle sizes were studied in detail. The optical characteristics of GRIN plastic rods with various amounts of silver nanoparticles were also estimated.
It was found that the diameters of silver nanoparticles ranged between 3 and 11 nm, increased with increasing the molar ratio of water to surfactant (W value). At a constant W value, the sizes of silver nanoparticles were found to increase with increasing of the concentrations of AgNO3 and NaBH4 , but were not significantly affected by AOT concentrations. The nanoparticle size would become smaller when the oily solvents with long mainchain were used.
In addition, the silver nanoparticles could be introduced into GRIN rods and increased the refractive index difference effectively. The amounts of inorganic nanoparticles introduced into GRIN rods were limited due to the formation of surfactant clusters in the plastic rods. The existence of surfactant may cause the aggregation of nanoparticles leading to the occurance of light scattering and becoming opaque.
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