| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 99 === Gold is most extensively studied because of its unique optics property, simple preparation, and high stability. Gold nanoparticles (Nano-Au) were modified with different thiol bases to create hydrophilic or hydrophobic functional groups on the surface of gold nanoparticle, and then thermosensitive poly N-isopropyl acrylamide (PNIPAAm) polymer was grafted. Nano-Au were prepared by the reduction reaction of trisodium citrate with hydrogen tetrachloroaurate (III) tetrahydrate (chloroauric acid) and modified with 11-mercaptoundecanoic acid (MUA) or 1-Decanethiol by the self-assembly monolayer (SAM). The oxygen plasma pretreatment on the nano-Au particles creates peroxide groups on the particle surface, which will cause oxidation reaction on the particles. UV light grafting polymerization of NIPAAm on the particle forms a thermosensitive polymer on the surface.
Quartz crystal microbalance (QCM) was used to determine the quality of surface modified gold nanoparticales. The sensitivity of measuring gold nanoparticle by the surface characteristic of modified hydrophilic or hydrophobic QCM sensor is investigated. Plasma chemical deposition technique was used to deposit an organic thin film on the QCM sensor surface. The measured frequency changes on the hydrophobic gold nanoparticles by Hexamethyldisilzane plasma deposition (PD-HMDSZ) and by the PD-HMDSZ and oxygen plasma treatments are two and a half, respectively, of that of QCM sensor without plasma deposition. It is evident
that QCM subjected to plasma treatment is easier to sense the gold nanoparticles and measure the frequency changes.
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