Unravelling the Role of Synthesis Conditions on the Structure of Zinc Oxide-Reduced Graphene Oxide Nanofillers
authors Alves, Z; Nunes, C; Ferreira, P
nationality International
journal NANOMATERIALS
author keywords zinc oxide; reduced graphene oxide; solvothermal synthesis; structure; lattice defects
keywords ENHANCED PHOTOCATALYTIC PERFORMANCE; ZNO NANOPARTICLES; HYDROTHERMAL SYNTHESIS; SURFACE-DEFECTS; QUANTUM DOTS; NANOSTRUCTURES; NANOCOMPOSITES; ANTIBACTERIAL; MORPHOLOGY; ANTIOXIDANT
abstract The diversity of zinc oxide (ZnO) particles and derived composites applications is highly dependent on their structure, size, morphology, defect amounts, and/or presence of dopant molecules. In this work, ZnO nanostructures are grown in situ on graphene oxide (GO) sheets by an easily implementable solvothermal method with simultaneous reduction of GO. The effect of two zinc precursors (zinc acetate (ZA) and zinc acetate dihydrate (ZAD)), NaOH concentration (0.5, 1 or 2 M), and concentration (1 and 12.5 mg/mL) and pH (pH = 1, 4, 8, and 12) of GO suspension were evaluated. While the ZnO particle morphology shows to be precursor dependent, the average particle size length decreases with lower NaOH concentration, as well as with the addition of a higher basicity and concentration of GO suspension. A lowered band gap and a higher specific surface area are obtained from the ZnO composites with higher amounts of GO suspension. Otherwise, the low concentration and the higher pH of GO suspension induce more lattice defects on the ZnO crystal structure. The role of the different condition parameters on the ZnO nanostructures and their interaction with graphene sheets was observed to tune the ZnO-rGO nanofiller properties for photocatalytic and antimicrobial activities.
publisher MDPI
isbn 2079-4991
year published 2021
volume 11
issue 8
digital object identifier (doi) 10.3390/nano11082149
web of science category 19
subject category Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
unique article identifier WOS:000689851100001
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journal impact factor 4.324
5 year journal impact factor 4.514
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