SiO2@AIZS奈米殼層結構合成及其光催化產氫研究;Photocatalytic hydrogen production based on SiO2@AIZS core-shell particles

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Title:	SiO2@AIZS奈米殼層結構合成及其光催化產氫研究;Photocatalytic hydrogen production based on SiO2@AIZS core-shell particles
Authors:	吳承洋;Wu, Cheng-Yang
Contributors:	化學工程與材料工程學系
Keywords:	固態溶液;殼層結構;光觸媒產氫;Solid solutions;Core-shell;Photocatalytic hydrogen production
Date:	2019-08-16
Issue Date:	2019-09-03 12:33:21 (UTC+8)
Publisher:	國立中央大學
Abstract:	利用表面電漿共振效應提升光觸媒的活性是近年來熱門的議題，我們過去的研究成功利用金銀奈米粒子的表面電漿共振效應提升ZnIn2S4的光催化產氫效率48,49，因AgInS2-ZnS (AIZS) 固態溶液具有可調控能隙的特性，所以本研究使用AIZS作為包覆二氧化矽外殼的金銀奈米粒子(GSNS@SiO2)的材料，但是GSNS@SiO2合成不易，因此我們主要先以二氧化矽作為AIZS的包覆對象。我們使用直接加熱法在有機溶劑環境下將AIZS包覆在二氧化矽表面，改變溫度及組成兩個重要的合成參數來探討其對包覆結果的影響。此外，為了提升SiO2@AIZS在有機溶劑下合成之親水性，我們使用表面離子基交換對光觸媒表面進行改質，結果顯示親水性有顯著地提升，且產氫效率也大幅上升。最後將合成法套用在GSNS@SiO2上，然而因GSNS@SiO2容易形成聚集的特性，以及二氧化矽與GSNS@SiO2顆粒大小的差異，使包覆的效果不如預期。應用表面電漿共振效應提升AIZS的產氫效率雖然仍未完善，但對於合成殼層結構(GSNS@dielectric@photocatalyst)有了進一步的了解。 ;Enhancing photocatalytic activities by surface plasmon resonance effect has been a popular issue in recent years. In our past research, we successfully apply surface plasmon resonance from gold-silver nanoparticles (GSNS NPs) to promote photocatalytic hydrogen production efficiency of ZnIn2S4. Due to a tunable band gap of AgInS2-ZnS (AIZS), AIZS solid solutions are used as the coating material to cover silica-coated gold-silver nanoparticles (GSNS@SiO2). Because of difficult synthesis of GSNS@SiO2, silica serves as the main coating target of AIZS. We used heating up method to coat AIZS onto silica surface in organic solvents, while two important parameters, temperature and composition, were varied to discuss its effect to coating results. Furthermore, in order to increase hydrophilicity of SiO2@AIZS synthesized in organics, we applied surface ligand exchange to do modification on its surface. Results of modification showed not only hydrophilicity obviously improved but hydrogen production efficiency increased substantially. Finally, synthesis method was carried out on GSNS@SiO2. However, due to easier aggregation of GSNS@SiO2 and difference of particle size between SiO2 and GSNS@SiO2, consequence of coating on GSNS@SiO2 was not as expected. Although it took time to study enhancing AIZS efficiency by surface plasmon resonance, our facile procedure paved the way to synthesize core-shell structure GSNS@dielectric@photocatalyst.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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