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Graphene oxide-modified ZnO particles: synthesis, characterization, and antibacterial properties.

Zhong L, Yun K - Int J Nanomedicine (2015)

Bottom Line: The morphology of the graphene oxide sheets and ZnO particles was confirmed with field emission scanning electron microscopy and biological atomic force microscopy.Enhanced electrochemical properties were detected with cyclic voltammetry, with a redox peak of the composites at 0.025 mV.After further study of the antibacterial mechanism, we concluded that a vast number of reactive oxygen species formed on the surface of composites, improving antibacterial properties.

View Article: PubMed Central - PubMed

Affiliation: Department of Bionanotechnology, Gachon University, Gyeonggi-do, Republic of Korea.

ABSTRACT
Nanosized ZnO particles with diameters of 15 nm were prepared with a solution precipitation method at low cost and high yield. The synthesis of the particles was functionalized by the organic solvent dimethylformamide, and the particles were covalently bonded to the surface of graphene oxide. The morphology of the graphene oxide sheets and ZnO particles was confirmed with field emission scanning electron microscopy and biological atomic force microscopy. Fourier transform infrared spectroscopy and X-ray diffraction were used to analyze the physical and chemical properties of the ZnO/graphene oxide composites that differed from those of the individual components. Enhanced electrochemical properties were detected with cyclic voltammetry, with a redox peak of the composites at 0.025 mV. Excellent antibacterial activity of ZnO/graphene oxide composites was observed with a microdilution method in which minimum inhibitory concentrations of 6.25 µg/mL for Escherichia coli and Salmonella typhimurium, 12.5 µg/mL for Bacillus subtilis, and 25 µg/mL for Enterococcus faecalis. After further study of the antibacterial mechanism, we concluded that a vast number of reactive oxygen species formed on the surface of composites, improving antibacterial properties.

No MeSH data available.


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XRD patterns.Notes: (A) ZnO particles; (B) graphene oxide; (C) ZnO/graphene oxide composites.Abbreviations: XRD, X-ray diffraction; ZnO, zinc oxide.
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f6-ijn-10-079: XRD patterns.Notes: (A) ZnO particles; (B) graphene oxide; (C) ZnO/graphene oxide composites.Abbreviations: XRD, X-ray diffraction; ZnO, zinc oxide.

Mentions: XRD is a useful technique for determining interlayer distances and crystalline structure in the powder form of a material by using the Bragg angle. Figure 6A shows the XRD patterns of ZnO powder, including the appearance of characteristic diffraction peaks for pure ZnO particles corresponding to the (100), (002), (101), (102), (110), (103), and (112) planes. All of the diffraction peaks confirm those of crystalline ZnO with a hexagonal wurtzite structure. The sharp diffraction peak observed in Figure 6B for graphene oxide appears at 2θ =11.6°, which agrees with previously reported results.35 The XRD pattern of the ZnO/graphene oxide composites is identical to that of ZnO in Figure 6C. The disappearance of the (001) reflection of graphene oxide in the XRD pattern of ZnO/graphene oxide composites can be attributed to the intercalation of ZnO particles that damaged the regular stack of graphene oxide.


Graphene oxide-modified ZnO particles: synthesis, characterization, and antibacterial properties.

Zhong L, Yun K - Int J Nanomedicine (2015)

XRD patterns.Notes: (A) ZnO particles; (B) graphene oxide; (C) ZnO/graphene oxide composites.Abbreviations: XRD, X-ray diffraction; ZnO, zinc oxide.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4554433&req=5

f6-ijn-10-079: XRD patterns.Notes: (A) ZnO particles; (B) graphene oxide; (C) ZnO/graphene oxide composites.Abbreviations: XRD, X-ray diffraction; ZnO, zinc oxide.
Mentions: XRD is a useful technique for determining interlayer distances and crystalline structure in the powder form of a material by using the Bragg angle. Figure 6A shows the XRD patterns of ZnO powder, including the appearance of characteristic diffraction peaks for pure ZnO particles corresponding to the (100), (002), (101), (102), (110), (103), and (112) planes. All of the diffraction peaks confirm those of crystalline ZnO with a hexagonal wurtzite structure. The sharp diffraction peak observed in Figure 6B for graphene oxide appears at 2θ =11.6°, which agrees with previously reported results.35 The XRD pattern of the ZnO/graphene oxide composites is identical to that of ZnO in Figure 6C. The disappearance of the (001) reflection of graphene oxide in the XRD pattern of ZnO/graphene oxide composites can be attributed to the intercalation of ZnO particles that damaged the regular stack of graphene oxide.

Bottom Line: The morphology of the graphene oxide sheets and ZnO particles was confirmed with field emission scanning electron microscopy and biological atomic force microscopy.Enhanced electrochemical properties were detected with cyclic voltammetry, with a redox peak of the composites at 0.025 mV.After further study of the antibacterial mechanism, we concluded that a vast number of reactive oxygen species formed on the surface of composites, improving antibacterial properties.

View Article: PubMed Central - PubMed

Affiliation: Department of Bionanotechnology, Gachon University, Gyeonggi-do, Republic of Korea.

ABSTRACT
Nanosized ZnO particles with diameters of 15 nm were prepared with a solution precipitation method at low cost and high yield. The synthesis of the particles was functionalized by the organic solvent dimethylformamide, and the particles were covalently bonded to the surface of graphene oxide. The morphology of the graphene oxide sheets and ZnO particles was confirmed with field emission scanning electron microscopy and biological atomic force microscopy. Fourier transform infrared spectroscopy and X-ray diffraction were used to analyze the physical and chemical properties of the ZnO/graphene oxide composites that differed from those of the individual components. Enhanced electrochemical properties were detected with cyclic voltammetry, with a redox peak of the composites at 0.025 mV. Excellent antibacterial activity of ZnO/graphene oxide composites was observed with a microdilution method in which minimum inhibitory concentrations of 6.25 µg/mL for Escherichia coli and Salmonella typhimurium, 12.5 µg/mL for Bacillus subtilis, and 25 µg/mL for Enterococcus faecalis. After further study of the antibacterial mechanism, we concluded that a vast number of reactive oxygen species formed on the surface of composites, improving antibacterial properties.

No MeSH data available.


Related in: MedlinePlus