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RISS 인기검색어
- 검색키워드
- 저자 : Guizhe Zhao (검색결과 3 건)
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Synthesis and Characterization of Hollow Silver Spheres at Room Temperature
Huiyu Chen,Yaqing Liu,Guizhe Zhao 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.2
Hollow silver spheres were synthesized at room temperature using sodium borohydride (NaBH4) as the reducing reagent and poly (vinyl pyrrolidone) (PVP) as the surfactant. The size of the synthesized hollow spheres ranged from 120 to 250 nm, and the surface was composed of many smaller silver nanoparticles. The asobtained product was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis absorption spectra. The amount of PVP had a significant effect on the morphology of the resultant silver samples. With an increasing concentration of PVP, the silver products possessed rod-like and shuttle-like shapes. The UV-vis spectrum demonstrated that the broad absorption peak centered at 417 nm resulted from the surface plasmon resonance (SPR) excitation of silver.
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Green Synthesis and Characterization of Se Nanoparticles and Nanorods
Huiyu Chen,Ji-Beom Yoo,Yaqing Liu,Guizhe Zhao 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.4
Selenium nanoparticles and nanorods were successfully prepared in a mixed solvent of ethylene glycol and water at a relatively low temperature of 85°C. No other surfactant or template was employed, and glucose was used as a green and mild reducing reagent in the current synthesis. The volume ratio of ethylene glycol to water played an important role for controlling the shapes of selenium products. The obtained selenium samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectra, and UV-vis absorption spectra. The evolution process from amorphous selenium to a trigonal phase complied with a “solid-solution-solid” formation mechanism. HRTEM and SAED results indicate that the trigonal selenium nanorods grow along the [001] direction. This method might provide an environmentally-friendly and low cost route for the synthesis of other related nanomaterials with controlled morphologies.
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Formation of Flower-Like Magnesium Hydroxide Microstructure via a Solvothermal Process
Huiyu Chen,Chunju Xu,Yaqing Liu,Guizhe Zhao 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.5
Flower-like magnesium hydroxide (Mg(OH)2) microstructure composed of many sheet-like nanopetals was prepared on a large scale via a solvothermal reaction at 200°C for 24 h. Water and ethanol mixed solution was employed as solvent and no additional surfactant was involved during the synthetic process. The Mg(OH)2microflowers were characterized by XRD, SEM, HRTEM, and UV-vis techniques. The average size of single flower is about 2 μm and the thickness of the petals ranges from 20 to 30 nm. The temperature and volume ratio of water to ethanol were found to be key roles for controlling the morphology of Mg(OH)2 products. The assembled petals of the Mg(OH)2 microflowers became thicker and smoother with the amount of water decreased in the mixed solvent. The present method is low cost, simple handle and environmentally benign,thus, it can be relatively easy to be scaled up for industrial production.
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