ZnO for photocatalytic air purification applications

Tudose, Ioan Valentin; Suchea, M.

doi:10.1088/1757-899x/133/1/012040

Cited by 12 publications

(2 citation statements)

References 16 publications

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“…Zinc oxide (ZnO) based material is greatly attractive as an effective semiconductor owing to its remarkable properties including direct wide band gap energy (3.37 eV), large exciton binding energy (60 meV), high electron mobility and good stabilities at high thermal and chemical environment [1,2]. Regarding promising properties of ZnO nanostructures, various demanding utilizations are based on this material such as antibacterial material, photodetector, photocatalyst, light emitting diode, solar cell and optical waveguide [3][4][5][6][7]. Thus, the production of ultrafine ZnO powder in nanoscale has been focused and different synthesis methods have been proposed via both bottom-up and top-down processes.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and X-ray photoelectron spectroscopic study of milled-ZnO material prepared by high energy ball milling technique

Mekprasart¹,

Ravuri²,

Yimnirun³

et al. 2020

ScienceAsia

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Luminescence properties that are correlated to near band edge emission and defect-related emission of milled zinc oxide (ZnO) powder prepared by high energy ball milling technique are investigated. Commercial ZnO powder (particle size of 525 nm) was chosen as starting material in milling process to produce ultrafine ZnO powder. The milling process was carried out at different speeds; 0, 200, 400 and 600 rpm for 10 min. After milling at high speed, change in color of milled ZnO powder was clearly observed that could be due to the defects in ZnO structure induced by mechanical strain during milling process. Surface morphology of milled ZnO powder was monitored by field-emission scanning electron microscopy (FESEM). Element component and surface chemical states of the samples were analyzed by X-ray photoelectron spectroscopy (XPS). Optical property of milled samples was investigated by diffuse reflectance UV-Vis spectrometer. Meanwhile, room-temperature photoluminescence spectroscopy of the milled samples was performed. The milled ZnO particle size was distinctly decreased to ca. 200 nm affirmed by FESEM images. Photoluminescence (PL) spectra of milled ZnO sample showed two prominent emission bands; UV and visible region. Visible emission intensity increased with increasing milling speed that would be attributed to greater structural defects caused by high mechanical strain during milling process.

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Section: Introductionmentioning

confidence: 99%

Photoluminescence and X-ray photoelectron spectroscopic study of milled-ZnO material prepared by high energy ball milling technique

Mekprasart¹,

Ravuri²,

Yimnirun³

et al. 2020

ScienceAsia

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“…The antibacterial and antifungal action of ZnO put ZnO NPs in the centre of interest in the fields of biomedicine and dentistry [11][12][13][14][15][16][17][18][19][20][21][22]. Research is in progress to find new applications of ZnO NPs in producing, for instance, solar cells [23,24], storage media [25], liquid crystals [26], nanostructured polymer composites [27], water filtration [28], photocatalysts [29][30][31], sensing applications [32,33], coatings for UV protection [34][35][36] and crop protection [37,38]. The development of the technologies of synthesis and modification of ZnO properties has made ZnO NPs the focus of spintronics [6,39].…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Co‒Mn Codoped ZnO Nanoparticles Obtained by Microwave Solvothermal Synthesis

et al. 2018

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Zinc oxide nanoparticles codoped with Co2+ and Mn2+ ions (Zn(1−x−y)MnxCoyO NPs) were obtained for the first time by microwave solvothermal synthesis. The nominal content of Co2+ and Mn2+ in Zn(1−x−y)MnxCoyO NPs was x = y = 0, 1, 5, 10 and 15 mol % (the amount of both ions was equal). The precursors were obtained by dissolving zinc acetate dihydrate, manganese (II) acetate tetrahydrate and cobalt (II) acetate tetrahydrate in ethylene glycol. The morphology, phase purity, lattice parameters, dopants content, skeleton density, specific surface area, average particle size, average crystallite size, crystallite size distribution and magnetic properties of NPs were determined. The real content of dopants was up to 25.0% for Mn2+ and 80.5% for Co2+ of the nominal content. The colour of the samples changed from white to dark olive green in line with the increasing doping level. Uniform spherical NPs with wurtzite structure were obtained. The average size of NPs decreased from 29 nm to 21 nm in line with the increase in the dopant content. Brillouin type paramagnetism and an antiferromagnetic interaction between the magnetic ions was found for all samples, except for that with 15 mol % doping level, where a small ferromagnetic contribution was found. A review of the preparation methods of Co2+ and Mn2+ codoped ZnO is presented.

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