Structural and Optical Properties Investigation of Graphene Oxide coated ZnO nanorods for Enhanced Photocatalytic Effect

Raub, Aini Ayunni Mohd; Yunas, Jumril; Mohamed, Mohd Ambri; Kazmi, Jamal; Ridwan, Jaenudin

doi:10.1109/rsm52397.2021.9511590

Cited by 4 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the difference in the size of ionic radii of Ni 2+ and Zn 2+ , a lattice distortion was observed in the Ni-ZnO NWs. Bragg's law and Debye Sherer formula [11,[33][34][35][36] were used to calculate the structural parameters and crystalline size. The crystallite sizes from the FWHM for the 002 peaks were ~61 nm and ~116 nm, respectively, for the ZnO and Ni-ZnO NWs film on a glass substrate.…”

Section: Resultsmentioning

confidence: 99%

Magneto-Transport and Enhanced Spin-Polarized Photo Response in Solution-Processed Vertically Aligned Zn0.9Ni0.1O Nanowires

Kazmi,

Raza

et al. 2023

Magnetochemistry

Self Cite

View full text Add to dashboard Cite

In this study, we grew pristine and Ni-doped vertically aligned zinc oxide nanowires (NWs) on a glass substrate. Both the doped and pristine NWs displayed dominant 002 peaks, confirming their vertical alignment. The Ni-doped NWs exhibited a leftward shift compared to the pristine NWs. TEM measurements confirmed the high crystallinity of individual NWs, with a d-spacing of ~0.267 nm along the c-axis. Ni-doped NWs had a higher density, indicating increased nucleation sites due to nickel doping. Doped NW films on glass showed enhanced absorbance in the visible region, suggesting the creation of sub-gap defect levels from nickel doping. Magnetization vs. magnetic field measurements revealed a small hysteresis loop, indicative of soft ferromagnetic behavior. Current transient plots demonstrated an increase in current with an applied magnetic field. Two-terminal devices exhibited a photo response that intensified with magnetic field application. This increase was attributed to parallel grain alignment, resulting in enhanced carrier concentration and photo response. In the dark, transport properties displayed negative magnetoresistance behavior. This magneto-transport effect and enhanced photo response (under an LED at ~395 nm) were attributed to giant magnetoresistance (GMR) in the aligned NWs. The observed behavior arose from reduced carrier scattering, improved transport properties, and parallel spin alignment in the magnetic field.

show abstract

Section: Resultsmentioning

confidence: 99%

Magneto-Transport and Enhanced Spin-Polarized Photo Response in Solution-Processed Vertically Aligned Zn0.9Ni0.1O Nanowires

Kazmi,

Raza

et al. 2023

Magnetochemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our previous study found that the combination of nanorods ZnO and rGO led to an increase in the photocatalytic activity of the photocatalyst. We successfully synthesized ZnO NRs hydrothermally in our earlier work, covered them with reduced graphene oxide, and investigated their optoelectronic, physical, and chemical properties [ 20 , 21 ]. GO-based nanomaterials can significantly increase the photocatalytic activity of ZnO because of their π-conjugated structure, which demonstrates excellent electronic mobility.…”

Section: Introductionmentioning

confidence: 99%

ZnO NRs/rGO Photocatalyst in a Polymer-Based Microfluidic Platform

et al. 2023

Self Cite

View full text Add to dashboard Cite

This paper reports the development of ZnO NRs/rGO-based photocatalysts integrated into a tree-branched polymer-based microfluidic reactor for efficient photodegradation of water contaminants. The reactor system includes a photocatalytic reactor, tree-branched microfluidic channels, and ZnO nanorods (NRs) coated with reduced graphene oxide (rGO) on a glass substrate within an area of 0.6 × 0.6 cm2. The ZnO NRs/rGO acts as a photocatalyst layer grown hydrothermally and then spray-coated with rGO. The microfluidic system is made of PDMS and fabricated using soft lithography (micro molding using SU-8 master mold patterned on a silicon wafer). The device geometry is designed using AutoCAD software and the flow properties of the microfluidics are simulated using COMSOL Multiphysics. The microfluidic platform’s photocatalytic process aims to bring the nanostructured photocatalyst into very close proximity to the water flow channel, reducing the interaction time and providing effective purification performance. Our functionality test showed that a degradation efficiency of 23.12 %, within the effective residence time of less than 3 s was obtained.

show abstract

“…These include metal-semiconductor nanocomposites [1], a range of metal oxides [2], and a combination of inorganic and organic materials [3]. Graphene, a two-dimensional material consisting of a honeycomb arrangement of carbon atoms, holds significant potential in various sectors of the medicinal and energy industries, such as photocatalysis, sensors, and membranes, due to its expansive surface area, higher conductivity, and chemical stability [4][5][6][7][8]. It is also possible to use efficient solar energy in nanotube formation [9,10].…”

Section: Introductionmentioning

confidence: 99%

Annealing Effects of ZnO Thin Film on Photocatalytic Performances of Graphene Composites

Rafi,

Kanda,

Honda

et al. 2023

View full text Add to dashboard Cite

The hybrid structure of Graphene and ZnO (Graphene/ZnO) is emerging as a novel material used to achieve the high performance of photocatalysis. In this study, we examined the ZnO characteristics that affect the photocatalytic activity of graphene/ZnO using a lamellar structure of graphene and ZnO thin films. Graphene samples were synthesized via chemical vapor deposition, and a typical wet process was applied to transfer them on sputter-deposited ZnO thin films with and without annealing. We confirmed that graphene-deposited ZnO demonstrated more efficient photocatalytic behavior toward the decomposition of methylene blue (as a model organic compound) with ordinary sputtered ZnO thin films. Again, ZnO thin films annealed at 1000 °C in an N2 gas atmosphere with graphene performed better than unannealed films. XRD analysis confirmed that pre-thermal treatment of a ZnO thin film promoted re-crystallization, which had less impact on the photocatalytic improvement. The attachment of graphene to the film is considered to contribute to the enhancement. Raman analysis revealed that the graphene coverage areas on the post-annealed ZnO increased by two times compared to that of an unannealed film where the unannealed film had a higher graphene layer. The results presented in this study demonstrate that an annealed ZnO thin film forms a better attachment with graphene, resulting in a larger graphene coverage area with fewer multilayers, which effectively improves the photocatalytic activity in composite structures.

show abstract

Structural and Optical Properties Investigation of Graphene Oxide coated ZnO nanorods for Enhanced Photocatalytic Effect

Cited by 4 publications

References 17 publications

Magneto-Transport and Enhanced Spin-Polarized Photo Response in Solution-Processed Vertically Aligned Zn0.9Ni0.1O Nanowires

Magneto-Transport and Enhanced Spin-Polarized Photo Response in Solution-Processed Vertically Aligned Zn0.9Ni0.1O Nanowires

ZnO NRs/rGO Photocatalyst in a Polymer-Based Microfluidic Platform

Annealing Effects of ZnO Thin Film on Photocatalytic Performances of Graphene Composites

Contact Info

Product

Resources

About