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Synthesis of metal nanoparticles by microwave-assisted solvothermal technique.

機譯：微波輔助溶劑熱技術(shù)合成金屬納米粒子。

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摘要

Metal nanoparticles of Ag, Ni, Pd, and Pt were synthesized in this research work by microwave-assisted solvothermal technique. The microwave-assisted solvothermol technique was found to be faster than the conventional solvothermal process in the synthesis of all the metal nanoparticles investigated here. Ethylene glycol, methanol, and ethanol were used as both reducing agents and solvents. The particle size and morphology were observed using a transmission electron miroscope (TEM). Particle size and size distribution were calculated by Image J(TM) software. Optical properties of synthesized metal nanoparticles were characterized by UV-Visible (UV-Vis) Spectrophotometer.;Silver nanoparticles of about 10 to 50 nm were synthesized with ethylene glycol as reducing agent. The morphology and particle size of Ag nanoparticle were controlled by varying the concentration of Ag metal source (AgNO 3), polyvinyl pyrrolidone (PVP) molecular weight, and the type of ligands. Furthermore, the growth rate was increased by adding NaOH in the system.;Well-dispersed Ni nanoparticles were synthesized with ethylene glycol as reducing agent in a binary protecting agent system of PVP and dodecylamine (DDA) with or without Pt seeding. By neutralizing the H+ formed from the reductive reaction and coordinating with Ni particles, DDA added in the reaction system contributed to the morphology and size control and also led to the formation of Ni nanoparticles without Pt seeding.;Palladium and platinum nanoparticles were synthesized with methanol and ethanol as reducing agents. The morphology and particle size were controlled by the concentration of metal precursors, the PVP to metal ions ratio, and the type of reducing agents.
機譯：通過微波輔助溶劑熱技術(shù)合成了Ag，Ni，Pd和Pt的金屬納米粒子。在這里研究的所有金屬納米粒子的合成中，發(fā)現(xiàn)微波輔助的溶劑熱敏技術(shù)比常規(guī)的溶劑熱法更快。乙二醇，甲醇和乙醇均用作還原劑和溶劑。使用透射電子顯微鏡（TEM）觀察粒度和形態(tài)。粒度和粒度分布通過Image J TM軟件計算。用紫外可見分光光度計對合成的金屬納米粒子的光學(xué)性質(zhì)進行了表征。以乙二醇為還原劑，合成了約10?50 nm的銀納米粒子。通過改變銀金屬源（AgNO 3）的濃度，聚乙烯吡咯烷酮（PVP）分子量和配體的類型來控制Ag納米顆粒的形態(tài)和粒徑。此外，通過在體系中添加NaOH可以提高生長速率。在具有或不具有Pt晶種的PVP和十二烷基胺（DDA）的二元保護劑體系中，以乙二醇為還原劑合成了分散良好的Ni納米顆粒。通過中和還原反應(yīng)生成的H +并與Ni顆粒配位，反應(yīng)體系中添加的DDA有助于形貌和尺寸控制，并導(dǎo)致沒有Pt晶種的Ni納米顆粒的形成。和乙醇作為還原劑。形態(tài)和粒度由金屬前體的濃度，PVP與金屬離子的比率以及還原劑的類型控制。

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  • 作者

    Li, Dongsheng.;

  • 作者單位

    The Pennsylvania State University.;

  • 授予單位 The Pennsylvania State University.;
  • 學(xué)科 Chemistry Inorganic.;Engineering Metallurgy.;Engineering Materials Science.
  • 學(xué)位 Ph.D.
  • 年度 2005
  • 頁碼 172 p.
  • 總頁數(shù) 172
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 無機化學(xué);工程材料學(xué);冶金工業(yè);
  • 關(guān)鍵詞

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