Controllable fabrication and photocatalysis of ZnO/Au nanohybrids via regenerative ion exchange and reduction cycles

Hou, Xiaomei; Wang, Lixia

doi:10.1039/c4ra10785c

Cited by 20 publications

(7 citation statements)

References 43 publications

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“…Moreover, a small hump at 280 nm in the absorption spectrum of IPN1 could be attributed to ionic silver or charged clusters. This result confirmed the presence of embedded metal nanoparticles in the structure of hydrogels and is in agreement with previously published papers [35,36,37].…”

Section: Resultssupporting

confidence: 93%

pH-Responsive Hybrid Hydrogels as Antibacterial and Drug Delivery Systems

2018

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This study describes the design and synthesis of organic–inorganic hybrid hydrogels based on an interpenetrating polymer network (IPN) composed of polyaspartic acid crosslinked by graphene nanosheets as the primary network and poly(acrylamide-co-acrylic acid) as the secondary network. Silver, copper oxide, and zinc oxide nanoparticles were formed within the gel matrix, and the obtained hydrogel was applied to a load and controlled release of curcumin. The loading of curcumin and the release of this drug from the gels depended on the nanoparticle’s (NP’s) content of hydrogels as well as the pH of the medium. The synthesized hydrogels showed antibacterial activity against E. coli and S. aureus bacteria. The ability of the synthesized hydrogels to incapacitate bacteria and their loading capacity and controlled release of curcumin qualify them for future therapies such as wound-dressing applications.

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Section: Resultssupporting

confidence: 93%

pH-Responsive Hybrid Hydrogels as Antibacterial and Drug Delivery Systems

2018

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“…In previous work, we demonstrated that derived gold NPs on 1D ZnO supports were produced via self-assembly of gold salt precursors and subsequent local reduction of AuCl 4 − ions, which are ion-paired with protonated 3-aminopropyltriethoxysilane (APTES) that are chemically attached to rich-hydroxyl surface of ZnOnanorods [16,17]. Herein, we further extended our study for the synthesis of 1D…”

Section: Introductionmentioning

confidence: 70%

Controlled loading of gold nanoparticles on ZnO nanorods and their high photocatalytic activity

Hou

Wang

et al. 2015

Materials Letters

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“…The overall effect is a decrease in the visible PL that is mitigated by the loss of the TPDT ligands. It should be noted that Hou and Wang synthesized AuNP/ZnO composite materials using a different method than in the present work. In their case, the gold nanoparticles were grown from reduction of AuCl 4 – ions onto 3-aminopropyltrimethoxysilane-functionalized ZnO nanorods.…”

Section: Resultsmentioning

confidence: 94%

Photocatalytic Activity and Fluorescence of Gold/Zinc Oxide Nanoparticles Formed by Dithiol Linking

et al. 2015

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Monolayer-protected gold nanoparticles (AuNPs) with average diameters of 2-4 nm have been covalently attached to zinc oxide nanorods using dithiol ligands. Electron microscopy and Raman spectroscopy show that ozone treatment or annealing at 300 or 450 °C increases the average diameter of the AuNPs to 6, 8, and 14 (±1) nm, respectively, and decomposes the organic layers to various degrees. These treatments locate the AuNPs closer to the nanorods. Heating and subsequent ozone exposure changes the color of the as-prepared nanocomposite powder from blue to purple due to oxidation of the outer layer of the AuNPs, and heating to 300 °C changes it to pink due to oxygen desorption. ZnO nanorods have a bimodal photoluminescence spectrum that consists of an ultraviolet excitonic peak and a visible, surface defect-related peak. Ozone treatment and annealing of the nanocomposite decreases the intensities of both peaks due to quenching by the AuNPs, but the visible peak is affected less. The photocatalytic efficiency of the nanocomposites toward oxidative degradation of rhodamine B has been measured and follows the order 300 °C > 450 °C > ozone treated ≈ as-prepared ≈ bare ZnO. The greater efficiency of the annealed samples likely arises from decreased electron-hole pair recombination rates.

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Controllable fabrication and photocatalysis of ZnO/Au nanohybrids via regenerative ion exchange and reduction cycles

Cited by 20 publications

References 43 publications

pH-Responsive Hybrid Hydrogels as Antibacterial and Drug Delivery Systems

pH-Responsive Hybrid Hydrogels as Antibacterial and Drug Delivery Systems

Controlled loading of gold nanoparticles on ZnO nanorods and their high photocatalytic activity

Photocatalytic Activity and Fluorescence of Gold/Zinc Oxide Nanoparticles Formed by Dithiol Linking

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