Tailoring morphology to control defect structures in ZnO electrodes for high-performance supercapacitor devices

Najib, Sumaiyah; Bakan, Feray; Abdullayeva, Nazrin; Bahariqushchi, Rahim; Kasap, Sibel; Franzò, G.; Sankır, Mehmet; Sankır, Nurdan Demirci; Mirabella, S.; Erdem, Emre

doi:10.1039/d0nr03921g

Cited by 111 publications

(59 citation statements)

References 29 publications

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“…In addition, emulating surface defects of multiscale MO particles could improve the antimicrobial activity in a hydrodynamic environment due to their enhanced ROS production from oxygen vacancies [53][54][55]. In particular, the structures of MO NPs or MPs affected the surface oxygen vacancies, resulting in enhanced ROS generation for antimicrobial perfor-mance based on electron-hole pair generation [55][56][57]. However, in the case of CuO and Cu 2 O particles, CuO particles reduce the superoxide radicals to produce Cu + , and Cu 2 O particles do not generate any superoxide radicals for sustained oxidative stress during redox cycling [58].…”

Section: Discussionmentioning

confidence: 99%

Multiscale Metal Oxide Particles to Enhance Photocatalytic Antimicrobial Activity against Escherichia coli and M13 Bacteriophage under Dual Ultraviolet Irradiation

Jin

2021

Pharmaceutics

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Antimicrobial activity of multiscale metal oxide (MO) particles against Escherichia coli (E. coli) and M13 bacteriophage (phage) was investigated under dual ultraviolet (UV) irradiation. Zinc oxide (ZnO), magnesium oxide (MgO), cuprous oxide (Cu2O), and cupric oxide (CuO) were selected as photocatalytic antimicrobials in MO particles. Physicochemical properties including morphology, particle size/particle size distribution, atomic composition, crystallinity, and porosity were evaluated. Under UV-A and UV-C irradiation with differential UV-C intensities, the antimicrobial activity of MO particles was monitored in E. coli and phage. MO particles had nano-, micro- and nano- to microscale sizes with irregular shapes, composed of atoms as ratios of chemical formulae and presented crystallinity as pure materials. They had wide-range specific surface area levels of 0.40–46.34 m2/g. MO particles themselves showed antibacterial activity against E. coli, which was the highest among the ZnO particles. However, no viral inactivation by MO particles occurred in phage. Under dual UV irradiation, multiscale ZnO and CuO particles had superior antimicrobial activities against E. coli and phage, as mixtures of nano- and microparticles for enhanced photocatalytic antimicrobials. The results showed that the dual UV-multiscale MO particle hybrids exhibit enhanced antibiotic potentials. It can also be applied as a next-generation antibiotic tool in industrial and clinical fields.

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Section: Discussionmentioning

confidence: 99%

Multiscale Metal Oxide Particles to Enhance Photocatalytic Antimicrobial Activity against Escherichia coli and M13 Bacteriophage under Dual Ultraviolet Irradiation

Jin

2021

Pharmaceutics

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“…[20][21][22] The origins of ZnO intrinsic defects have been studied by EPR spectroscopy. [20][21][22][23][24] This technique is suitable to understand the role of defect centers, as it provides a direct method for monitoring different paramagnetic states of vacancies and paramagnetic metal ions.…”

Section: Domingos Et Almentioning

confidence: 99%

“…ZnO is an n-type semiconductor with the wurtzite-type hexagonal crystal structure and a band gap of around 3.2 eV. Recent studies [20][21][22][23][24] have suggested the possibility of different electronic states in the band gap associated with negatively charged Zn vacancies and positively charged oxygen vacancies. This could indicate a possible transition from a typical n-type to a p-type ZnO semiconductor and, consequently, the development of new electronic devices.…”

Section: Domingos Et Almentioning

confidence: 99%

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

Domingos

Ruellas

Peçanha

et al. 2021

Int J Applied Ceramic Tech

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With industrial and technological advances, it has been increasingly possible to raise the production capacity of essential items for various activities, in addition to promoting comfort and safety for people. However, human actions cause society to face several environmental problems, which are increasingly the target of global concern in all areas, especially in the scientific community. Among these problems is the high and constant worldwide use of dyes, mostly associated with the textile industry, since the demand for clean water is high, 1,2 mainly in the dyeing stage,

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“…As observed for other nanomaterials [ 36 , 37 , 38 , 39 ], ZnO optical properties have demonstrated a high sensitiveness to several features, such as morphology [ 11 , 29 , 40 ], growth parameters and precursors [ 41 , 42 ], as well as environmental conditions [ 43 , 44 ]. All these parameters concur in defining the defectiveness, that is the concentration and types of point defects present in the material, of ZnO and the resultant luminescence.…”

Section: Introductionmentioning

confidence: 99%

Morphology Related Defectiveness in ZnO Luminescence: From Bulk to Nano-Size

et al. 2020

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This study addresses the relationship between material morphology (size, growth parameters and interfaces) and optical emissions in ZnO through an experimental approach, including the effect of different material dimensions from bulk to nano-size, and different excitations, from optical sources to ionizing radiation. Silica supported ZnO nanoparticles and ligand capped ZnO nanoparticles are synthesized through a sol–gel process and hot injection method, respectively. Their optical properties are investigated by radioluminescence, steady-state and time-resolved photoluminescence, and compared to those of commercial micrometric powders and of a bulk single crystal. The Gaussian spectral reconstruction of all emission spectra highlights the occurrence of the same emission bands for all samples, comprising one ultraviolet excitonic peak and four visible defect-related components, whose relative intensities and time dynamics vary with the material parameters and the measurement conditions. The results demonstrate that a wide range of color outputs can be obtained by tuning synthesis conditions and size of pure ZnO nanoparticles, with favorable consequences for the engineering of optical devices based on this material.

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Tailoring morphology to control defect structures in ZnO electrodes for high-performance supercapacitor devices

Abstract: Zinc oxide (ZnO) nanostructures were synthesized in the form of nanoparticles, nanoflowers and nanourchins. Structural. electronic and optical characterization of the samples were done via standard techniques such as X-ray...

Cited by 111 publications

References 29 publications

Multiscale Metal Oxide Particles to Enhance Photocatalytic Antimicrobial Activity against Escherichia coli and M13 Bacteriophage under Dual Ultraviolet Irradiation

Multiscale Metal Oxide Particles to Enhance Photocatalytic Antimicrobial Activity against Escherichia coli and M13 Bacteriophage under Dual Ultraviolet Irradiation

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

Morphology Related Defectiveness in ZnO Luminescence: From Bulk to Nano-Size

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