Enhanced UV emission from ZnO nanoflowers synthesized by the hydrothermal process

Vinod, R.; Sajan, P.; Achary, Sreekumar Rajappan; Martı́nez-Tomás, C.; Muñoz‐Sanjosé, V.; Bushiri, M. Junaid

doi:10.1088/0022-3727/45/42/425103

Cited by 42 publications

(42 citation statements)

References 39 publications

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“…Figures 1B-1E shows the HR-SEM images of zinc oxide nanoparticles that have formed nanoflower and nanorod like structures. Similar structures were observed using hydrothermal methods at elevated temperatures (2008C) over 3 h [5]. Till date there have been no reports of zinc oxide nanoflowers synthesized using algae.…”

Section: Resultssupporting

confidence: 73%

“…Bulk zinc oxide absorbs around 373 nm due to its wide band gap whereas a red shift of 13 nm was observed in our sample. This has been previously observed in ZnO nanoflowers and was ascribed to the oriented attachment of the nanorods [5,17]. ZnO nanoparticles were also synthesized at a pH of 7 and the spectrum was found to be blue-shifted compared to the bulk; at more alkaline conditions no nanoparticles were formed (data not shown).…”

Section: Resultssupporting

confidence: 72%

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Synthesis and characterization of ZnO nanoflowers using Chlamydomonas reinhardtii: A green approach

Rao

Pennathur

2016

Env Prog and Sustain Energy

109

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Recently, there has been a lot of interest in the synthesis and application of nanoparticles with anisotropic morphologies. The focus of this study has been to use a biologically mediated, low temperature approach for the synthesis of zinc oxide nanoflowers. “Green” methods have a number of advantages over conventional approaches; these include the use of environmentally benign reactants and its economic feasibility. The cell free extract of Chlamydomonas reinhardtii, a fresh water microalga was used to synthesize the nanoflowers. The nanoflowers were composed of individual nanorods that assembled to form flower‐like structures. The nanorods measured 330 nm in length and these nanorods self‐assembled to form porous nanosheets that were found to measure 55–80 nm. Particle size analysis revealed that the larger porous nanoflowers approximately measured 4 µm. Powder X‐ray diffraction studies revealed that the zinc oxide nanoflowers had a hexagonal wurtzite crystal structure. Fourier transform infrared spectroscopy analysis suggested that algal biomolecules were responsible for the synthesis and stabilization of zinc oxide nanostructures. These nanoflowers demonstrate enhanced photocatalytic activity against methyl orange (MO) under natural sunlight. The effects of dye concentration and catalyst dosage on photocatalysis were also studied. The present approach represents a novel, eco‐friendly method to synthesize zinc oxide nanoflowers that have potential applications in water treatment and dye degradation. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1020–1026, 2016

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Section: Resultssupporting

confidence: 73%

Section: Resultssupporting

confidence: 72%

Synthesis and characterization of ZnO nanoflowers using Chlamydomonas reinhardtii: A green approach

Rao

Pennathur

2016

Env Prog and Sustain Energy

109

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“…The initial reactants were dissolved in distilled water and maintained at a pH of about 8–10. The reactants were placed in a sealed Teflon‐lined stainless steel autoclave and maintained at a temperature of 200 °C for 3 h under autogenous pressure . After the heating process, the autoclave was allowed to cool naturally to reach room temperature.…”

Section: Methodsmentioning

confidence: 99%

Mn²⁺‐induced room‐temperature ferromagnetism and spin‐glass behavior in hydrothermally grown Mn‐doped ZnO nanorods

Vinod

Bushiri

Sajan

et al. 2014

Physica Status Solidi (a)

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The magnetic properties of Mn‐doped ZnO (ZnO:Mn) nanorods grown by hydrothermal process at a temperature of 200 °C and a growth time of 3 h have been studied. The samples were characterized by using powder X‐ray diffraction with Rietveld refinement, scanning electron microscopy, energy‐dispersive X‐ray analysis and SQUID magnetometry. Mn (3 wt%) and (5 wt%)‐doped ZnO samples exhibit paramagnetic and ferromagnetic behavior, respectively, at room temperature. The spin‐glass behavior is observed from the samples with respect to the decrease of temperature. At 10 K, both samples exhibit a hysteresis loop with relatively low coercivity. The room‐temperature ferromagnetism in 5 wt% Mn‐doped ZnO nanorods is attributed to the increase in the specific area of grain boundaries, interaction between dopant Mn2+ ions substituted at Zn2+ site and the interaction between Mn2+ ions and Zn2+ ions from the ZnO host lattice. M–H curve of hydrothermally grown ZnO:Mn (3 wt%) and ZnO:Mn (5 wt%) nanorods at 10 K.

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“…A sharp band edge emission in near UV region at 390 nm and a wide broad band extending laterally between 450 nm and up to 700 nm with peaks centered around 580 nm were clearly observed in the emission spectra. 31 The edge emission for ZnO nanodumbbells shows significant presence of defects. It is extensively reported that broad DLE band is a defect-related emission.…”

Section: Mechanism For Nanodumbbells Formationmentioning

confidence: 99%

Influence of Parametric Variations on Hydrothermal Growth of ZnO Nanostructures for Hybrid Polymer/ZnO Based Photodetector

Dixit

Bilgaiyan

Palani

et al. 2016

j nanosci nanotechnol

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Dumbbell and flower like ZnO nano-crystals were grown via hydrothermal process. The as-prepared dumbbells, with length of 0.8-10 µm and edge length of 0.3-0.8 µm possess a hexagonal structure, while flowers with lengths ranging from 1-6 µm with hexagonal structure have been synthesized. The effect of temperature, solution concentration and growth time on the size and shapes of the ZnO nanostructures has been studied using Field emission scanning electron microscope (FESEM) and X-ray diffractometer (XRD). Further the optical properties of nanostructures were investigated by Photoluminescence (PL) spectroscopy, which shows emission in UV and visible regions. From Diffused reflectance spectroscopic analysis (DRA) it was observed that ZnO nanodumbbells and nanoflowers have a direct band gap of 3.27 eV and 3.25 eV respectively. The I-V plot showed dependence of current values under dark and illumination over the annealing temperature during the growth stage. Thus we report a control over the shape and dimension of nanostructures by varying various parameters having implications for (opto)electronic devices.

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Enhanced UV emission from ZnO nanoflowers synthesized by the hydrothermal process

Cited by 42 publications

References 39 publications

Synthesis and characterization of ZnO nanoflowers using Chlamydomonas reinhardtii: A green approach

Synthesis and characterization of ZnO nanoflowers using Chlamydomonas reinhardtii: A green approach

Mn²⁺‐induced room‐temperature ferromagnetism and spin‐glass behavior in hydrothermally grown Mn‐doped ZnO nanorods

Influence of Parametric Variations on Hydrothermal Growth of ZnO Nanostructures for Hybrid Polymer/ZnO Based Photodetector

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Enhanced UV emission from ZnO nanoflowers synthesized by the hydrothermal process

Cited by 42 publications

References 39 publications

Synthesis and characterization of ZnO nanoflowers using Chlamydomonas reinhardtii: A green approach

Synthesis and characterization of ZnO nanoflowers using Chlamydomonas reinhardtii: A green approach

Mn2+‐induced room‐temperature ferromagnetism and spin‐glass behavior in hydrothermally grown Mn‐doped ZnO nanorods

Influence of Parametric Variations on Hydrothermal Growth of ZnO Nanostructures for Hybrid Polymer/ZnO Based Photodetector

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Mn²⁺‐induced room‐temperature ferromagnetism and spin‐glass behavior in hydrothermally grown Mn‐doped ZnO nanorods