Growth of ZnO nanorods on the surface and edges of a multilayer graphene sheet

2017 ◽  
Vol 139 ◽  
pp. 77-82 ◽  
Author(s):  
Faramarz Hossein-Babaei ◽  
Mehdi Akbari-Saatlu
Keyword(s):  
Graphene Sheet ◽  
Zno Nanorods ◽  
Multilayer Graphene

scholarly journals Graphene-Au Film Synthesized from GrO in Au-Aquaeus Solution as Counter Electrode For DSSC Application

2019 ◽  
Vol 7 (2) ◽  
pp. 24
Author(s):  
Marjoni Imamora Ali Umar
Keyword(s):  
Solar Cell ◽  
Electrical Properties ◽  
Counter Electrode ◽  
Annealing Temperature ◽  
Zno Nanorods ◽  
Annealing Treatment ◽  
Thermal Reduction ◽  
Multilayer Graphene ◽  
Solar Cell Performance ◽  
Probe Measurements

The study on the optical, electrical properties of multilayer graphene (MLG) obtained by thermal-reduction of graphene oxide (GrO) which was synthesized directly by mixing graphite oxide (GO) flake in 0.005, 0.01, 0.015, and 0.02 M of Au aqueous solution has been successfully performed. The resultant  GrO was subjected to an annealing temperature of 200°C, 400°C, 500°C for 1h to obtain MLG, and G-Au2x, G-Au4x, and G-Au5x (x=.0.005, 0.01, 0.015, and 0.02). The resultant samples were then characterized using FESEM, UV-VIS, four-point probe measurements to study its morphology, optical, and electrical properties. The transmission G-Au increase and its sheet resistant decrease as an increase of annealing temperature. Besides, the annealing treatment was then achieved of its microstructure which is expected may be used as a counter electrode in solar cell applications. The best DSSC devices with Quartz/FTO/ZnO Nanorods/Dye/G-Au50.01/Quartz structures have resulted in current-density, Voc, and solar cell performance of 0.1 mA/cm2, 0.42 V, and 0.01%, respectively.

Multilayer Graphene Sheet with Conical Nanopores as a Membrane for High-Permeance Molecular Separation

2021 ◽  
Vol 125 (5) ◽  
pp. 3047-3054
Author(s):  
Chengzhen Sun ◽  
Runfeng Zhou ◽  
Bofeng Bai ◽  
Yuansheng Lin ◽  
Bangming Li
Keyword(s):  
Graphene Sheet ◽  
Multilayer Graphene ◽  
Molecular Separation ◽  
Conical Nanopores

A Method to Determine the Geometry-Dependent Bending Stiffness of Multilayer Graphene Sheets

2020 ◽  
Vol 88 (1) ◽  
Author(s):  
Xiaojie Ma ◽  
Luqi Liu ◽  
Zhong Zhang ◽  
Yueguang Wei
Keyword(s):  
Graphene Sheet ◽  
Cylindrical Surface ◽  
Complex Geometry ◽  
Lattice Structure ◽  
Stress Transfer ◽  
Quantitative Agreement ◽  
Bending Stiffness ◽  
Graphene Sheets ◽  
Multilayer Graphene ◽  
Trilayer Graphene

Abstract We consider how the bending stiffness of a multilayer graphene sheet relies on its bending geometry, including the in-plane length L and the curvature κ. We use an interlayer shear model to characterize the periodic interlayer tractions due to the lattice structure. The bending stiffness for the sheet bent along a cylindrical surface is extracted via an energetic consideration. Our discussion mainly focuses on trilayer sheets, particularly the complex geometry-dependency of their interlayer stress transfer behavior and the overall bending stiffness. We find that L and κ dominate the bending stiffness, respectively, in different stable regions. These results show good quantitative agreement with recent experiments where the stiffness was found to be a non-monotonic function of the bending angle (i.e., Lκ). Besides, for a given in-plane length, the trilayer graphene in the flat state (κ → 0) is found to have the maximum bending stiffness. According to our analytical solution to the flat state, the bending stiffness of trilayer graphene sheet can vary by two orders of magnitude. Furthermore, once multilayer graphene sheets are bent along a cylindrical surface with small curvature, the sheets perform similar characteristics. Though the discussion mainly focuses on the trilayer graphene, the theoretical framework presented here can be readily extended for various van der Waals materials beyond graphene of arbitrary layer numbers.

Flexural electromechanical properties of multilayer graphene sheet/carbon nanotube/vinyl ester hybrid nanocomposites

2020 ◽  
Vol 194 ◽  
pp. 108164 ◽  
Author(s):  
C.A. Sierra-Chi ◽  
H. Aguilar-Bolados ◽  
M.A. López-Manchado ◽  
R. Verdejo ◽  
J.V. Cauich-Rodríguez ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Graphene Sheet ◽  
Vinyl Ester ◽  
Hybrid Nanocomposites ◽  
Multilayer Graphene ◽  
Electromechanical Properties

Elastic properties of graphene-reinforced aluminum nanocomposite: Effects of temperature, stacked, and perforated graphene

2020 ◽  
Vol 234 (9) ◽  
pp. 1218-1227
Author(s):  
Ashish Kumar Srivastava ◽  
Vimal Kumar Pathak
Keyword(s):  
Graphene Sheet ◽  
Graphene Sheets ◽  
Marginal Effect ◽  
Multilayer Graphene ◽  
Plane Shear ◽  
Shear Moduli ◽  
Temperature Changes ◽  
Stiffness Properties ◽  
Out Of Plane ◽  
Dynamics Simulations

In this article, the elastic and shear moduli of the graphene sheet-reinforced aluminum nanocomposite have been investigated by molecular dynamics simulations. Different models have been simulated to study the effect of multilayer graphene sheet, perforation of GS, and temperature on the elastic and shear moduli of resulting nanocomposite. The simulation results show that the elastic and shear moduli of graphene sheet-reinforced aluminum are sensitive to the temperature changes, multilayer, and perforated graphene sheets. The temperature and perforation of graphene sheets exert adverse effects on the elastic and shear moduli of graphene sheet-reinforced aluminum nanocomposites. However, the multilayer graphene sheet leads to favorable effects on the stiffness properties of the nanocomposite. It is also observed that there is only a marginal effect of the chirality of graphene sheet on the out-of-plane shear moduli of the nanocomposite.

scholarly journals Graphene-Tapered ZnO Nanorods Array as a Flexible Antireflection Layer

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Taeseup Song
Keyword(s):  
Mechanical Property ◽  
Solar Cells ◽  
Graphene Sheet ◽  
Conversion Efficiency ◽  
Light Transmission ◽  
Flexible Substrate ◽  
Zno Nanorods ◽  
Two Dimensional ◽  
Nanorods Array ◽  
Conformal Coverage

Flexible solar cells have drawn a great deal of attention due to their various advantages including deformable and wearable characteristics. In the solar cells, the antireflection layer plays an important role in the improvement in the conversion efficiency by increasing the light transmission and suppressing the Fresnel refraction. For the successful implantation of the antireflection layer into the flexible solar cells, the flexible mechanical property of the antireflection layer is also necessary. However, the study on flexible antireflection layer for the flexible solar cells or optoelectronics is still lacking. In this study, we report the graphene-tapered ZnO nanorods array as a flexible antireflection layer for the application in flexible solar cells. Flexible two-dimensional graphene sheet and the tapered morphology of ZnO nanorods enable conformal coverage on the flexible substrate with curved surface and significant improvements in antireflection properties, respectively.

Exhibition of novel photocatalytic activity and photoluminescence properties with high inhibition towards bacterial growth by hydrothermally grown ZnO nanorods

2020 ◽  
Vol 16 ◽  
Author(s):  
Nihar Ranjan Panda ◽  
Dojalisa Sahu
Keyword(s):  
Methylene Blue ◽  
Bacterial Growth ◽  
Organic Dyes ◽  
Zno Nanorods ◽  
Antibacterial Properties ◽  
Crystallographic Structure ◽  
Inhibition Activity ◽  
Electron Microscopic ◽  
Skin Bacteria ◽  
High Inhibition

Background: Metal oxide nanomaterial such as; ZnO shows novel structural, optical, electrical and antibacterial properties due to wide band gap (3.37 eV) and high excitonic binding energy (60 meV). Probing these inherent properties of nanosized ZnO with different morphology has generated new interest among researchers Objective: To investigate the size dependent functional attributes, ZnO nanorods were prepared by hydrothermal method and the photocatalytic (PC) efficiency was studied. The photoluminescence (PL) property of ZnO nanorods was also studied by recording the emission spectrum under photo-excitation. These nanorods (NRs) were coated on cotton fabric to study the effectiveness of these NRs in defending and inhibiting the growth of different bacteria Methods: The crystallographic structure and morphology of the ZnO samples were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopic (FESEM) measurements. PL measurement at room temperature was undertaken by exciting the sample with light of wavelength 350 nm. The PC property of ZnO NRs was studied in degrading organic dyes like methylene blue. Bacteria like Staphylococcus aureus, Escherichia coli and Bacillus subtilis were cultured and the inhibition of growth of these bacteria was studied by the application of ZnO. To enhance the microbe defence mechanism of fabric, we coated these NRs on fabric test samples and investigated the bacterial growth on it. Results: XRD and FESEM studies reveal the dimension of the synthesized products in nano range. These nanorods are of high density and surface roughness as per the FESEM study. PL measurement shows the presence of strong UV emission at 382 nm with defect emissions in the blue-green region opening up the path for ZnO to be used in fabrication of optoelectronic devices. PC study reveals that 89% degradation of methylene blue (MB) dye is achievable in 180 min using these ZnO catalysts. The anti-bacterial study shows that the minimum inhibitory concentration (MIC) of ZnO nanorods coated on the fabric against S. aureus is found to be 3.5 mg/ml which is the minimum as compared to E. coli (7.5 mg/ml) and B. subtilis (5.5 mg/ml). The study further enunciates that fabric coated with ZnO samples exhibited considerably high inhibition activity toward S. aureus. Conclusion: The study shows that ZnO NRs can be effectively used for fabrication of UV-LASER/LED. Photocatalytic efficiency of ZnO will be useful for degradation of organic dyes controlling environment pollution. It further enunciates that fabric coated with ZnO samples exhibited considerably high inhibition activity toward S. aureus (skin bacteria) which will be helpful in defending microbes if used in surgical cotton bandages

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