Graphene oxide/WS2/Mg-doped ZnO nanocomposites for solar-light catalytic and anti-bacterial applications

Chen, Chuansheng; Yu, Weiwei; Liu, Tiangui; Cao, Shiyi; Tsang, Yuen Hong

doi:10.1016/j.solmat.2016.10.020

Cited by 143 publications

(58 citation statements)

References 43 publications

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“…Based on direct allowed transition type, the optical bandgap of all samples is estimated using Tauc's equation (Equation ) ;

italicαhν = A {(hν - E_{normalg})}^{1 / 2}

where α is the absorption coefficient, A is the absorbance of the sample, E g is the optical bandgap, h is the Planck constant, and v is reciprocal of the wavelength. The absorption coefficient ( α ) depends on the absorbance ( A ) and is given by Equation :

α = ((), \frac{2,303}{d}) A

…”

Section: Resultsmentioning

confidence: 99%

Effect of plasmonic au nanoparticles on the photoactivity of polyaniline/indium tin oxide electrodes for water splitting

Rabia

Abukhadra

Ahmed

et al. 2019

Env Prog and Sustain Energy

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Three nanomaterials based on polyaniline (PANI) are prepared on indium tin oxide (ITO) and applied as electrodes for H2 generation due to the water‐splitting process. PANI/ITO films are prepared using oxidation polymerization method at 25°C, then coated with Au nanoparticles with different thicknesses (sputter time from 1 to 2 min). The three prepared electrodes; PANI/ITO (Electrode (0), 1‐min‐Au/PANI/ITO (Electrode (I)), and 2‐min‐Au/PANI/ITO (Electrode (II)) are compared for H2 generation from H2O. Scanning electron microscope, X‐ray diffraction, UV‐Vis spectrophotometer, and Fourier‐transform infrared spectroscopy analyses have been carried out, in which the average PANI crystal size was ~20 nm. Moreover, the bandgaps were determined, in which 2‐min‐Au/PANI/ITO has the optimum bandgap of 2.25 eV. The characteristic behavior of the H2 generation took place depending on the current density (Jph) value by using Jph–V and Jph–time study. Also, the incident photon‐to‐current conversion efficiency (IPCE) and the applied bias photon‐to‐current efficiency (ABPE) were calculated for the Electrode (II) at 25°C. The optimum IPCE and ABPE efficiency were 18.7 and 0.99%, respectively, at 390 nm. By increasing the temperature to 70°C, the IPCE efficiency increases to about 37%. Finally, activation energy (Ea), enthalpy (ΔH*), and entropy (ΔS*) were determined, in which the values were 24.32 kJ mol−1, 10.90 kJ mol−1, and 74.99 J K−1 mol−1, respectively. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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“…Based on direct allowed transition type, the optical bandgap of all samples is estimated using Tauc's equation (Equation ) ;

italicαhν = A {(hν - E_{normalg})}^{1 / 2}

α = ((), \frac{2,303}{d}) A

…”

Section: Resultsmentioning

confidence: 99%

Effect of plasmonic au nanoparticles on the photoactivity of polyaniline/indium tin oxide electrodes for water splitting

Rabia

Abukhadra

Ahmed

et al. 2019

Env Prog and Sustain Energy

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“…Black phosphorus (BP) has shown strong layer dependent bandgap energy [13], which has also been used to fabricate SA for Q-switching pulse generation [14]. Transition metal dichalcogenides (TMDs) compounds, a different type of 2D layered materials, have demonstrated excellent properties based on the atomic ratio [15] and d-electron number of the transition metal [16]. TMDs has the stoichiometry of MX 2 .…”

Section: Introductionmentioning

confidence: 99%

Laser Q-switching with PtS₂ microflakes saturable absorber

et al. 2018

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Numerous studies have been conducted to explore the performance of two-dimensional (2D) layered nano-materials based saturable absorber (SA) for pulsed laser applications. However, fabricating materials in nanoscale requires complicated preparation processes, high energy consumption, and high expertise. Hence, the study of pulsed laser performance based on the saturable absorber prepared by layered materials with bulk-micro size have gained a great attention. Platinum disulfide (PtS), which is newly developed group 10 2D layered materials, offers great potential for the laser photonic applications owing to its high carrier mobility, broadly tunable natural bandgap energy, and stability. In this work, the first passively Q-switched Erbium (Er) doped fiber laser is demonstrated with an operational wavelength of 1568.8 nm by using PtS microflakes saturable absorber, fabricated by a simple liquid exfoliation in N-Methyl-2-pyrrolidone (NMP) and then incorporated into polyvinyl alcohol (PVA) polymer thin film. A stable Q-switched laser operation is achieved by using this PtS-SA within a fiber laser ring cavity. The maximum average output power is obtained as 1.1 mW, corresponding to the repetition rate of 24.6 kHz, the pulse duration of 4.2 μs, and single pulse energy of 45.6 nJ. These results open up new applications of this novel PtS layered material.

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“…Indeed, it is employed as one of the best materials to widen the bandgap of ZnO . Although a wide bandgap is a drawback for a photocatalytic material, Mg‐doped ZnO nanostructures are, more often than not, used as photocatalysts in abundance . Several groups have justified that because the Mg‐doped ZnO bandgap is wider than ZnO bandgap, the former is able to catch more fractions of the solar spectrum than the latter.…”

Section: Introductionmentioning

confidence: 99%

“…[11] Although aw ide bandgap is ad rawback for a photocatalytic material, Mg-doped ZnO nanostructures are, more often than not, used as photocatalysts in abundance. [12][13][14][15][16][17][18][19] Several groups have justified that because the Mg-dopedZ nO bandgapi swider than ZnO bandgap,t he former is able to catch more fractionso ft he solar spectrum than the latter.E tacheri et al reported that the increase in the bandgap valueso fZ nO due to Mg 2 + resulted in superiort extural properties and efficient electron-hole separation, which influenced the enhanced sunlight-driven photocatalytic activity of Mgdoped ZnO. [12] By using DFT methods,Q iu et al observed that replacement of Zn 2 + ions with Mg 2 + ions in the wurtzite ZnO structure largely affected the conduction band (CB), yet left the valenceb and (VB) of ZnO nearly unchanged.T hey further reported that the contribution of the Mg 3s orbitals to the CB becamem ore pronouncedw ith an increase in the Mg content, which explained the enhanced photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of Enhanced Photocatalytic Activity of Mg‐Doped ZnO NPs and ZnO/rGO Nanocomposites

Yousefi

Beheshtian

Seyed‐Talebi

et al. 2018

Chemistry An Asian Journal

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A systematic experimental and theoretical study of the origin of the enhanced photocatalytic performance of Mg-doped ZnO nanoparticles (NPs) and Mg-doped ZnO/reduced graphene oxide (rGO) nanocomposites has been performed. In addition to Mg, Cd was chosen as a doping material for the bandgap engineering of ZnO NPs, and its effects were compared with that of Mg in the photocatalytic performance of ZnO nanostructures. The experimental results revealed that Mg, as a doping material, recognizably ameliorates the photocatalytic performance of ZnO NPs and ZnO/graphene nanocomposites. Transmission electron microscopy (TEM) images showed that the Mg-doped and Cd-doped ZnO NPs had the same size. The optical properties of the samples indicated that Cd narrowed the bandgap, whereas Mg widened the bandgap of the ZnO NPs and the oxygen vacancy concentration was similar for both samples. Based on the experimental results, the narrowing of the bandgap, the particle size, and the oxygen vacancy did not enhance the photocatalytic performance. However, Brunauer-Emmett-Teller (BET) and Barret-Joyner-Halenda (BJH) models showed that Mg caused increased textural properties of the samples, whereas rGO played an opposite role. A theoretical study, conducted by using DFT methods, showed that the improvement in the photocatalytic performance of Mg-doped ZnO NPs was due to a higher electron transfer from the Mg-doped ZnO NPs to the dye molecules compared with pristine ZnO and Cd-doped ZnO NPs. Moreover, according to the experimental results, along with Mg, graphene also played an important role in the photocatalytic performance of ZnO.

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Graphene oxide/WS2/Mg-doped ZnO nanocomposites for solar-light catalytic and anti-bacterial applications

Cited by 143 publications

References 43 publications

Effect of plasmonic au nanoparticles on the photoactivity of polyaniline/indium tin oxide electrodes for water splitting

Effect of plasmonic au nanoparticles on the photoactivity of polyaniline/indium tin oxide electrodes for water splitting

Laser Q-switching with PtS₂ microflakes saturable absorber

Experimental and Theoretical Study of Enhanced Photocatalytic Activity of Mg‐Doped ZnO NPs and ZnO/rGO Nanocomposites

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Graphene oxide/WS2/Mg-doped ZnO nanocomposites for solar-light catalytic and anti-bacterial applications

Cited by 143 publications

References 43 publications

Effect of plasmonic au nanoparticles on the photoactivity of polyaniline/indium tin oxide electrodes for water splitting

Effect of plasmonic au nanoparticles on the photoactivity of polyaniline/indium tin oxide electrodes for water splitting

Laser Q-switching with PtS2 microflakes saturable absorber

Experimental and Theoretical Study of Enhanced Photocatalytic Activity of Mg‐Doped ZnO NPs and ZnO/rGO Nanocomposites

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Laser Q-switching with PtS₂ microflakes saturable absorber