ZnS coating for enhanced environmental stability and improved properties of ZnO thin films

Baranowska‐Korczyc, Anna; Kościński, Mikołaj; Coy, Emerson; Grześkowiak, Bartosz F.; Jasiurkowska-Delaporte, Małgorzata; Peplińska, Barbara; Jurga, Stefan

doi:10.1039/c8ra02823k

Cited by 35 publications

(10 citation statements)

References 54 publications

(75 reference statements)

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“…Moreover, due to its good biocompatibility, low cytotoxicity, high surface to volume ratio with enhanced surface reactivity, and antistatic, antimicrobial, antibacterial, and antifungal properties, ZnO found broad application in biomedicine as a drug carrier, a biomarker for cell labelling, a biosensor, and an antibacterial agent [ 4 , 5 , 6 ]. The material’s functional properties can be achieved by modification of their crystal structure, e.g., by incorporation of impurities into the crystal structure or by surface modification/construction of the materials with the core-shell structure, as well as by obtaining organic/inorganic or inorganic/inorganic composites [ 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Gelatin-ZnO Nanofibers for Antibacterial Applications

et al. 2020

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In this study, GNF@ZnO composites (gelatin nanofibers (GNF) with zinc oxide (ZnO) nanoparticles (NPs)) as a novel antibacterial agent were obtained using a wet chemistry approach. The physicochemical characterization of ZnO nanoparticles (NPs) and GNF@ZnO composites, as well as the evaluation of their antibacterial activity toward Gram-positive (Staphyloccocus aureus and Bacillus pumilus) and Gram-negative (Escherichia coli and Pseudomonas fluorescens) bacteria were performed. ZnO NPs were synthesized using a facile sol-gel approach. Gelatin nanofibers (GNF) were obtained by an electrospinning technique. GNF@ZnO composites were obtained by adding previously produced GNF into a Zn2+ methanol solution during ZnO NPs synthesis. Crystal structure, phase, and elemental compositions, morphology, as well as photoluminescent properties of pristine ZnO NPs, pristine GNF, and GNF@ZnO composites were characterized using powder X-ray diffraction (XRD), FTIR analysis, transmission and scanning electron microscopies (TEM/SEM), and photoluminescence spectroscopy. SEM, EDX, as well as FTIR analyses, confirmed the adsorption of ZnO NPs on the GNF surface. The pristine ZnO NPs were highly crystalline and monodispersed with a size of approximately 7 nm and had a high surface area (83 m2/g). The thickness of the pristine gelatin nanofiber was around 1 µm. The antibacterial properties of GNF@ZnO composites were investigated by a disk diffusion assay on agar plates. Results show that both pristine ZnO NPs and their GNF-based composites have the strongest antibacterial properties against Pseudomonas fluorescence and Staphylococcus aureus, with the zone of inhibition above 10 mm. Right behind them is Escherichia coli with slightly less inhibition of bacterial growth. These properties of GNF@ZnO composites suggest their suitability for a range of antimicrobial uses, such as in the food industry or in biomedical applications.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Gelatin-ZnO Nanofibers for Antibacterial Applications

et al. 2020

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“…Modes A1 and E1 are divided into two components, transverse optical (TO) and longitudinal optical (LO), which are both highly isotropic. A1 (TO)=E1 (TO) and A1 (LO)=E1 (LO), this is a characteristic feature of wurtzite ZnS [54]. The LO mode, which corresponds to the hexagonal and cubic structures of the ZnS structures, occurs at 350 cm −1 .…”

Section: Resultsmentioning

confidence: 89%

ZnS Nanoparticles‐decorated Composite Graphene Paper: A Novel Flexible Electrochemical Sensor for Detection of Dopamine

et al. 2021

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Dopamine (DA) is a significant catecholamine neurotransmitter in human metabolism, and DA is related to several critical illnesses. Accurate detection of DA is important to diagnose these diseases. Here, we demonstrated a flexible electrochemical sensor, ZnS nanoparticles decorated composite graphene paper electrode (CGPE), for the detection of DA. CGPE was prepared via mold‐casting method using ZnS/graphene oxide dispersion followed by thermal reduction treatment. The characterization of the flexible CGPE was investigated through various techniques. The electrochemical tests were carried out to study the electrocatalytic properties of CGPE against DA oxidation. Compared to graphene paper electrode (GPE), the oxidation of DA occurred at about 250 mV lower potential on CGPE, and peak current density increased about 2 times. Our sensor exhibited high sensitivity in linear range of 0.1–2300 μM of DA with a limit of detection (LOD) of 0.0042 μM. Furthermore, CGPE has selectively detected DA even in the medium containing AA and UA which are biologically active interfering molecules. Besides, the sensor showed many attractive properties such as high durability, stability, and reproducibility and it was successfully applied for the determination of DA in real samples for practical applications.

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“…A feature like 381 cm −1 is particular in ZnO and reported earlier to A 1 (TO) symmetry. [ 32–34 ] As pointed out earlier, defects and associated phenomena have always been an interest; therefore, identification could lead to a doorway. Also, a typical peak of 581 cm −1 irrespective of the excitation has been recorded.…”

Section: Resultsmentioning

confidence: 99%

First‐principle investigation of defect‐associated LVM and structural parameter dependency in response to the ground state on‐site Hubbard correction of w‐ZnO

Ahmed

Senthilkumar

2022

J Raman Spectroscopy

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We report a combined experimental (at 81 K, room temperature) and theoretical Raman study of plasma synthesized ZnO nanoparticles. The linear response method calculates the on‐site Coulomb interaction (Hubbard correction) energies Ud = 12.65 eV and Up = 7.65 eV. The structural changes and hybridization mechanism of the d‐p orbital of Zn and O have shown a significant role in bandgap discrepancies. Density of state (DOS) calculations under the influence of Hubbard correction explains the d‐band energy shift mechanism. Over underestimation of bandgap energies phenomena turns out to be highly sensitive to the choice of pseudopotential, and a series of calculations have been reported to converse to greater accuracy. The theoretical calculation was made possible using generalized gradient approximation (GGA)‐based basis set Perdew, Burke, and Ernzerh (PBE); B3LYP; and local density approximation (LDA). Estimates improve accuracy by including the Hubbard correction energy to the ground state energy calculation using the LDA. We have provided approximations methods suitable for the defect complex study based on our systematic analysis among PBE, B3LYP, and LDA. For the correlated system, the choice of pseudopotential is primarily essential; therefore, the present article also discusses the application of Hubbard correction energy only to a specific orbital and consequences. Experimentally observed fundamental and multiphonon decay processes are explained. The defect trapped hydrogen and defect complex configuration state m()normalO−normalH−VZn, m = 1, …, 4, local vibrational mode is observed. Systematic molecular design and simulation support the experimentally reported results. The VZn, in association with a single 1s electron of hydrogen, compromises state followed by silent, and second‐order features are presented.

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ZnS coating for enhanced environmental stability and improved properties of ZnO thin films

Cited by 35 publications

References 54 publications

Fabrication of Gelatin-ZnO Nanofibers for Antibacterial Applications

Fabrication of Gelatin-ZnO Nanofibers for Antibacterial Applications

ZnS Nanoparticles‐decorated Composite Graphene Paper: A Novel Flexible Electrochemical Sensor for Detection of Dopamine

First‐principle investigation of defect‐associated LVM and structural parameter dependency in response to the ground state on‐site Hubbard correction of w‐ZnO

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