• Title/Summary/Keyword: Flower-like zinc oxide

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Synthesis of Zinc Oxide Nano Rods, Sheet and Flower at $80^{\circ}C$ by the Sol-gel Method

  • Wahab, Rizwan;Ansari, S.G.;Kim, Y.S.;Dar, M.A.;Shin, H.S.
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09a
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    • pp.676-677
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    • 2006
  • Synthesis of zinc oxide nanorods, sheets and flower like structure were done by the sol-gel method using zinc acetate dihydrate and sodium hydroxide at $80^{\circ}C$ with 12 hours refluxing time nanorods, in case of as synthesized powder, with diameter of 20-60nm. Annealing at higher temperature (300 and $500^{\circ}C$,) in air ambient changes the morphology to sheet and flower like structure. The standard peak of zinc oxide was observed in IR at $523cm^{-1}$. The UV-VIS spectroscopy of zinc oxide shows a characteristic peak at 375nm.

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Synthesis, Structural Characterization, and Catalytic Activity of Flower Like ZnO Nanostructures

  • Ramachandran, K.;Kumar, G. Gnana;Kim, Ae Rhan;Yoo, Dong Jin
    • Bulletin of the Korean Chemical Society
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    • v.35 no.4
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    • pp.1091-1097
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    • 2014
  • Tageteserecta flower like zinc oxide nanostructures composed of hexagonal nanorods were synthesized via sonochemical method at room temperature. The synthesized nanomaterials exhibited wurtzite hexagonal phase structure with the single crystalline nature. The diameter of the individual nanorods that constitute the flower shaped zinc oxide structures is in the range of 120-160 nm. The sonication time effectively determined the morphological properties of the prepared materials. The catalytic activity of prepared zinc oxide nanostructures towards N-formylation reactions were evaluated without any surface modification and the nanostructures exhibited good reaction yield with the prompt recyclability behavior.

Preparation and Characterization of Low Density Polyethylene (LDPE) and Flower-like Zinc Oxide (FZnO) Composite Films (저밀도폴리에틸렌(LDPE)/꽃 모양 산화아연(FZnO) 복합필름의 제조 및 물성 분석)

  • Kim, Insoo;Lee, Hojun;Kim, Dowan;Seo, Jongchul
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.22 no.3
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    • pp.85-93
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    • 2016
  • Flower-like zinc oxide (FZnO) was successfully synthesized via a sonochemical process. The chemical structure, morphology, and antimicrobial properties of as- prepared FZnO were investigated. Additionally, pure LDPE and five different LDPE/FZnO composite films were prepared with different FZnO content by using a twin screw extruder. According to the FTIR and SEM analyses, there exists weak interfacial interaction between LDPE and FZnO. Compared with pure LDPE, the LDPE/FZnO composite films showed UV barrier and enhanced antimicrobial activity against Escherichia coli (E. coli) as a Gram-negative micro-organism and Staphylococcus aureus (S. aureus) as a Gram-positive micro-organism. To enhance the interfacial interaction and good dispersion of FZnO into the LDPE matrix, and resultantly to such as UV barrier and antimicrobial properties of LDPE/FZnO composite films as the packaging materials, further efforts are required.

3-dimensional nanostructured ZnO gas sensor (3차원 ZnO 나노구조체 가스센서)

  • Park, Yong-Wook;Shin, Hyun-Yong;Yoon, Seok-Jin
    • Journal of Sensor Science and Technology
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    • v.19 no.5
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    • pp.356-360
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    • 2010
  • Due to the high surface-to-volume ratio, the 3-dimensional(3D) nanostructures of metal oxides are regarded as the best candidate materials for the chemical gas sensors. Here we have synthesised flower-like 3D zinc oxide nanostructures through a simple hydrothermal route. Specific surface area of the 3D zinc oxide nanostructures synthesised in different pH values from 9.0 to 12.0 were evaluated by using a BET analyzer and the results were compared with that of a zinc oxide thin film fabricated by rf sputtering. Using interdigitated electrodes, superior CO gas sensing properties of the 3D zinc oxide nanostructures on the ZnO thin film to those of the ZnO thin film were demonstrated.

Particle Shapes and Optical Property of Synthesized ZnO with Amine Additives (아민첨가제를 사용하여 합성된 ZnO의 입자형상 및 광학적 특성)

  • Hyeon, Hye-Hyeon;Hyun, Mi-Ho;Lee, Dong-Kyu
    • Journal of the Korean Applied Science and Technology
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    • v.33 no.1
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    • pp.23-29
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    • 2016
  • Zinc oxide of hexagonal wurzite, is known as n-type semiconductor. It has a wide band gap energy of 3.37 eV and large exciton binding energy of 60 meV. It can be widely applied to gas sensors, laser diodes, dye-sensitized solar cells and degradation of dye waste. The use of microwave hydrothermal synthesis brings a rapid reaction rate, high yield, and energy saving. Amine additives control the different particle shapes because of the chelate effect and formation of hydroxide ion. In this study, zinc nitrate hexahydrate was used as zinc precursor. In addition, ethanolamine, ethylenediamine, diethylenetriamine, and hexamethylenetetramine are used as shape control agent. The pH value was controlled as 11 by NaOH. The shapes of zinc oxide are star-like, rod, flower-like, and circular cone. In order to analyze physical, chemical, and optical properties of ZnO with diverse amine additives, we used XRD, SEM, EDS, FT-IR, UV-Vis spectroscopy, and PL spectroscopy.

Sonochemical Synthesis and Photocatalytic Characterization of ZnO Nanoparticles (초음파 방법을 이용한 ZnO 나노입자 합성 및 광촉매 특성 연구)

  • Kim, Min-Seon;Kim, Jae-Uk;Yoo, Jeong-Yeol;Kim, Jong-Gyu
    • Journal of the Korean Chemical Society
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    • v.60 no.1
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    • pp.34-38
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    • 2016
  • In this paper, zinc oxide nanoparticles (ZnO NPs) were synthesized using the sonochemical method, where equimolar amounts of zinc acetate dehydrate and sodium hydroxide were separately dissolved in deionized water, and then mixed for 30 min under magnetic stirring. The resultant white gel was sonicated for 60, 120, 180, 240, and 360 min with magnetic stirring. The obtained precipitates were centrifuged, repeatedly washed with ethanol to remove ionic impurities, and dried at 50 ℃ for 24 h. The formation of pure NPs was confirmed by X-ray diffraction, and their crystallinity and crystal phases were analyzed as well. Structural investigation was carried out by field-emission scanning electron microscopy (FE-SEM). The photocatalysis behavior of the ZnO NPs was investigated in a dark room under UV irradiation, using Rhodamine B. Spherical, rod, and flower-like ZnO NPs could be obtained by adjusting the sonication time, as observed by FE-SEM. The flower-like ZnO NPs exhibited excellent photocatalytic activity.