One-pot sol–gel synthesis of reduced graphene oxide uniformly decorated zinc oxide nanoparticles in starch environment for highly efficient photodegradation of Methylene Blue

Azarang, Majid; Shuhaimi, Ahmad; Yousefi, Ramin; Jahromi, Siamak Pilban

doi:10.1039/c4ra16767h

Cited by 124 publications

(39 citation statements)

References 49 publications

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“…Amongst the different methods of synthesis of ZnO nanostructures, the sol-gel method is attractive for its simplicity and environmentfriendly conditions. Sol-gel preparation of solid catalysts has been reported by many research groups [16][17][18][19][20]. Using this method, the crystal grain can develop completely and the particle size is uniform.…”

Section: Introductionmentioning

confidence: 99%

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

2015

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Zinc oxide nanopowders were synthesized by the simple sol-gel method from an ethanol solution of zinc nitrate hexahydrate. Structural and surface morphological investigations were carried out using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible (UV-Vis) spectrophotometry analyses. XRD pattern showed that the zinc oxide nanoparticles exhibited hexagonal wurtzite structure. A multiple-layered structure of obelisk-shaped ZnO nanoparticles was achieved after calcinations. The average particle size of ZnO was around 20 nm as estimated by direct HRTEM observation. The size of sphere-like shaped ZnO nanoparticles was measured in the range of 20-80 nm and the size of pyramid-like shaped annealed samples was achieved in the range of 40-100 nm with less agglomeration. The energy dispersive spectroscopy spectrum showed peaks of zinc and oxygen. The sharp peaks in FTIR spectrum determined the Zn-O stretching and absorbance peak of UV-Vis spectrum showed the wide bandgap energy of 3.35 eV.

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Section: Introductionmentioning

confidence: 99%

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

2015

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“…Actually, these S 8 peaks could be from the DBSA, which were removed by annealing of the samples. In addition, as can clearly be seen from the patterns of the PbS/GO samples, no peak observes from the GO in the XRD patterns of the composites that usually appears at 10.6 ° [19]. Therefore, the XRD results indicate that, the GO sheets were changed to the rGO sheets during synthesis and annealing process.…”

Section: -Results and Discussionmentioning

confidence: 60%

“…Graphene oxide (GO) solution was synthesized by modified Hummers' method that detailed of synthesis was reported elsewhere [19]. A GO solution with 14g/L concentration was prepared and then different percentages of the GO solutions with 3 and 5 wt.…”

Section: -Experimentalmentioning

confidence: 99%

Effect of annealing temperature and graphene concentrations on photovoltaic and NIR-detector applications of PbS/rGO nanocomposites

Yousefi

Mahmoudian

́aedi

et al. 2016

Ceramics International

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“…ZnO has numerous attractive characteristics for electronics and optoelectronics devices due to its various accessibility of growth method and also due to its unique properties. ZnO has a good transparency and strong room temperature luminescence, so it can be considered as a promising material for different applications [1][2][3][4]. One of the best ways to improve ZnO nanostructure properties is doping.…”

Section: Introductionmentioning

confidence: 99%

Effect of transition metal elements on the structural and optical properties of ZnO nanoparticles

2016

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Undoped and transition metal (TM)-doped ZnO nanoparticles (Zn 0.98 X 0.02 O-NPs, X = Mn, Cr, Co and Fe) were synthesized from a metal nitrate precursor and gelatin by a sol-gel method. The compounds were synthesized at calcination temperatures of 550 • C for 6 h. The synthesized undoped/doped ZnO-NPs were characterized by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). XRD results indicated that the sample products were crystalline with a hexagonal wurtzite phase. SEM images showed the ZnO-NPs nearly spherical shapes and a non-uniform shape for doped ZnO-NPs. The crystalline development in the ZnO-NPs was investigated by X-ray peak broadening. The size-strain plot (SSP) method was used to study the individual contributions of crystallite sizes and lattice strain of the undoped and doped ZnO-NPs. The obtained results showed that strain of the NPs plays an important role in peak broadening; moreover, the mean crystalline size of the undoped and doped ZnO-NPs estimated from the SEM and the SSP method was highly inter-correlated. Finally, optical properties of the samples were studied by a UV-Vis spectrometer.

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One-pot sol–gel synthesis of reduced graphene oxide uniformly decorated zinc oxide nanoparticles in starch environment for highly efficient photodegradation of Methylene Blue

Abstract: ZnO NPs + reduced graphene oxide (rGO) nanocomposites were synthesized using a sol–gel method with starch as the polymerisation agent.

Cited by 124 publications

References 49 publications

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

Effect of annealing temperature and graphene concentrations on photovoltaic and NIR-detector applications of PbS/rGO nanocomposites

Effect of transition metal elements on the structural and optical properties of ZnO nanoparticles

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