Alkali-dependent synthesis of flower-like ZnO structures with enhanced photocatalytic activity via a facile hydrothermal method

Sun, Lin; Shao, Rong; Chen, Zhidong; Tang, Lanqin; Dai, Yong; Ding, Jianfei

doi:10.1016/j.apsusc.2012.02.034

Cited by 89 publications

(26 citation statements)

References 29 publications

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“…It was found that nanoparticles synthesized at near-room temperatures exhibited greater activity against microbes16. Several studies have employed the use of stirring during preparation of ZnO-NPs474849. However, the method of producing ZnO-NPs exploiting stirring effect as the prime parameter has not been reported till now.…”

Section: Resultsmentioning

confidence: 99%

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

Khan

Ansari

Hameedullah

et al. 2016

Sci Rep

275

135

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The effect of mechanical stirring on sol-gel synthesis of thorn-like ZnO nanoparticles (ZnO-NPs) and antimicrobial activities is successfully reported in this study. The in-house synthesized nanoparticles were characterized by XRD, SEM, TEM, FTIR, TGA, DSC and UV-visible spectroscopy. The X-Ray Diffraction analysis revealed the wurtzite crystal lattice for ZnO-NPs with no impurities present. The diametric measurements of the synthesized thorn-like ZnO-NPs (morphology assessed by SEM) were well accounted to be less than 50 nm with the help of TEM. Relative decrease in aspect ratio was observed on increasing the agitation speed. The UV-visible spectroscopy showed the absorption peaks of the ZnO-NPs existed in both UVA and UVB region. A hypsochromic shift in λmax was observed when stirring pace was increased from 500 rpm to 2000 rpm. The FTIR spectroscopy showed the absorption bands of the stretching modes of Zn-O between 500 cm−1 to 525 cm−1. The Thermal analysis studies revealed better stability for ZnO-NPs prepared at 2000 rpm (ZnO-2000 rpm). TGA revealed the weight loss between two main temperatures ranges viz. around (90 °C–120 °C) and (240 °C–280 °C). Finally, the effect of ZnO-NPs prepared at different stirring conditions on the growth of Gram-positive (Bacillus subtilis), Gram-negative (Escherichia coli) bacteria and a fungi (Candida albicans) were examined; which showed good antibacterial as well as antifungal properties. These findings introduce a simple, inexpensive process to synthesize ZnO-NPs using conventional methods without the use of sophisticated equipments and its application as a potent nano-antibiotic.

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Section: Resultsmentioning

confidence: 99%

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

Khan

Ansari

Hameedullah

et al. 2016

Sci Rep

275

135

View full text Add to dashboard Cite

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“…Compared with these composites, our synthesized bare ZnO nanoparticles are having the enhanced photodegradation efficiency and advantage of operating under sunlight. Furthermore, Sun et al (2012) have reported synthesis of nut-like, hexagonal sphere-like, oblate-like and flower-like ZnO structures and studied the UV-assisted photodegradation of methylene blue dye. The results shows that, 100 mL, 10 mg/L of the aqueous MB dye solution was degraded after 180 min of UV light irradiation in presence of each of the studied photocatalyst (80 mg).…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Synthesis, characterization and photocatalytic activity of PVP stabilized ZnO and modified ZnO nanostructures

et al. 2013

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In the present study, ZnO nanostructures have been successfully synthesized by hydrothermal, sonochemical and precipitation methods using polyvinyl pyrrolidone (PVP) as the capping agent. The ZnO nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-Visible spectroscopy and photoluminescence (PL) techniques. The XRD results revealed the hexagonal wurtzite structure of the ZnO nanostructures for all the samples. Furthermore, the morphology of the ZnO particles was obtained from FESEM micrographs. Particles prepared by hydrothermal method were found to be rice grain shaped and that prepared by precipitation and sonochemical methods were spherical shaped. Sunlight driven photocatalytic degradation of methylene blue (MB) was studied for ZnO nanostructures synthesized by various methods. The ZnO nanostructures were further decorated with Ag nanoparticles to enhance its dye degradation efficiency. The Ag decorated ZnO nanoparticles exhibited a higher degradation rate as compared to pure ZnO nanoparticles which was independent of pH. Since this process of dye degradation relies on the degradation of dye due to oxidation by highly reactive hydroxyl radicals, there are many factors which affect the efficiency of this process. Hence a study was conducted on the effect of various parameters on ZnO viz amount of catalyst, reaction pH and concentration of MB dye.

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“…Such a method was successful in the synthesis of TiO 2 24 Transition of structures from an acorn-shape, a hexagonal bi-prism shape, and flower-like aggregates made from the assembly of hexagonal columnar crystals was observed by changing the ratio of Zn 2+ / OH ¹ , as it influenced the nucleation of ZnO. However, the synthesized particles were too large to be used in DSSCs but that could be improved in a microwave-assisted reaction.…”

mentioning

confidence: 99%

Microwave-assisted Hydrothermal Synthesis of Structure-controlled ZnO Nanocrystals and Their Properties in Dye-sensitized Solar Cells

Sun

Sugiura

et al. 2017

Electrochemistry

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Microwave-assisted hydrothermal synthesis of ZnO nanocrystals has resulted in two distinctive structures: hexagonal bi-pyramidal (HBP) and nano-sheet (NS) shapes from Zn(CH 3 COO) 2 solutions containing triethanolamine or benzene tetracarboxylic acid as structure directing agents, respectively. Observation by field-emission scanning electron microscope, high resolution transmission electron microscope as well as analysis of selected area electron beam diffraction patterns revealed that the predominantly exposed facets of HBP and NS ZnO are (102) and (100) faces, occupying 84 and 76% of the total surface area, respectively. Adsorption of D149 and eosin Y photosensitizer dyes onto HBP and NS ZnO was studied in comparison with a randomly structured commercial ZnO nanocrystal (MZ). Density of dye packing was found to be in the order of HBP > MZ > NS, for which HBP was 2 to 5 times higher than NS. Consequently, dye-sensitized solar cells employing HBP ZnO exhibited the highest short circuit photocurrent, but also the lowest open circuit voltage. By contrast, the DSSCs employing NS ZnO exhibited the highest voltage among the three.

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Alkali-dependent synthesis of flower-like ZnO structures with enhanced photocatalytic activity via a facile hydrothermal method

Cited by 89 publications

References 29 publications

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

Synthesis, characterization and photocatalytic activity of PVP stabilized ZnO and modified ZnO nanostructures

Microwave-assisted Hydrothermal Synthesis of Structure-controlled ZnO Nanocrystals and Their Properties in Dye-sensitized Solar Cells

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