Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

Sahdan, Mohd Zainizan; Mamat, M. H.; Muhamad, Salina; Khusaimi, Z.; Noor, Uzer Mohd; Rusop, M.

doi:10.1002/pssc.200983722

Cited by 27 publications

(8 citation statements)

References 22 publications

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“…The high violet emission is centred approximately at 413 nm that can be attributed to the transition energy from zinc interstitial level to the valance band in ZnO. The high indigo emission is centred approximately at 425 nm that can be attributed to the transition energy from conduction band to zinc vacancy level [26, 27]. The blue emissions are centred approximately at 437 and 454 nm are attributed to the recombination between zinc interstitial energy level to zinc vacancy energy level.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and characterisation of flower‐like ZnO nanostructures grown chemically on flexible PEN substrate

Shabannia

2016

Micro & Nano Letters

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Flower-like ZnO nanostructures were successfully produced on a polyethylene naphthalate (PEN) substrate through a chemical bath deposition method. Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), photoluminescence (PL), and ultraviolet-visible were utilised to investigate the structural and optical properties of grown flower-like ZnO nanostructures. FESEM image indicates that fabricated ZnO nanostructures formed from the ZnO nanoflowers with different shape and the petals of the ZnO nanoflower grow symmetrically and radially from the centre. XRD pattern of the ZnO nanoflowers indicate that the ZnO nanorods of the nanoflowers were preferentially grown along the c-axis. The PL results of the ZnO nanoflowers exhibited a strong violet and indigo emission peaks are centred approximately at 413 and 425 nm, respectively.

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Section: Resultsmentioning

confidence: 99%

Fabrication and characterisation of flower‐like ZnO nanostructures grown chemically on flexible PEN substrate

Shabannia

2016

Micro & Nano Letters

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“…Table 1 shows the detailed structural parameters of the nanostructures. The full width of half maximum (FWHM) measurements were taken from the (002) peaks, and the crystallite size was measured via the Scherrer formula [29,30].…”

Section: Nanostructured Xrd Structural and Pl Optical Characteristicsmentioning

confidence: 99%

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

et al. 2021

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Different Zinc Oxide (ZnO) morphologies have been used to improve photodetector efficiencies for optoelectronic applications. Herein, we present the very novel hybrid ZnO flower-rod (HZFR) morphology, to improve photodetector response and efficiency when compared to the prevalently used ZnO nanorods (NRs) and ZnO nanoflowers (NFs). The HZFR was fabricated via sol-gel microwave-assisted hydrothermal methods. HZFR achieves the benefits of both NFs, by trapping a greater amount of UV light for the generation of e-h pairs, and NRs, by effectively transporting the generated e-h pairs to the channel. The fabricated photosensors were characterized with scanning electron microscopy, X-ray diffraction, photoluminescence, and a Keithley 4200A-SCS parameter analyzer for their morphology, structural characteristics, optical performance, and electrical characteristics, respectively. The transient current response, current-voltage characteristics, and responsivity measurements were set as a benchmark of success to compare the sensor response of the three different morphologies. It was found that the novel HZFR showed the best UV sensor performance with the fastest response time (~7 s), the highest on-off ratio (52), and the best responsivity (126 A/W) when compared to the NRs and NFs. Hence, it was inferred that the HZFR morphology would be a great addition to the ZnO family for photodetector applications.

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“…This condition is caused by the thermal coefficient difference between two or more materials. The stress in the films is highly dependent on annealing temperature, thickness, and chemical contents [34][35][36]. Besides, the different transmittances may be due to the various morphologies, shapes, defect states, and sizes as well as porous structures when varying the number of NiO layers on  -Fe2O3 structures [37].…”

Section: Transmittance and Absorbancementioning

confidence: 99%

PHYSICAL PROPERTIES OF NOVEL α-Fe2O3/NiO HETEROSTRUCTURES THROUGH IMMERSION/ SOL–GEL SPIN COATING METHOD: DIFFERENT DEPOSITION NUMBERS OF NiO LAYER

et al. 2021

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The novel hematite (α-Fe2O3)/nickel oxide (NiO) heterostructures were grown on fluorine-doped tin oxide (FTO) coated glass substrates at various deposited NiO of 3, 5, and 7 layers. The heterostructures were successfully synthesized using the immersion and sol–gel spin coating methods for α-Fe2O3 and NiO films, respectively. The field emission scanning electron microscopy analysis showed that each sample of α-Fe2O3/NiO heterostructures has a unique surface morphology when deposited with different NiO layers. The X-ray diffraction pattern shows that the number of NiO layers affected the diffraction peaks. The NiO diffraction peak intensity at (111) plane increased when the deposition number of NiO layer was increased. The crystallite sizes of NiO were 35.4, 33.6, and 38.0 nm for 3-, 5-, and 7-layer NiO, respectively. The interplanar spacing, lattice parameter, and unit cell volume indicate NiO with 3-layer as the highest, while 5- and 7-layer had the same values. Meanwhile, the strain and stress values show the compressive strain and tensile stress, respectively. The optical properties reveal that the highest transmittance and the lowest absorbance percentages were recorded for a 3-layer NiO sample. In contrast, the lowest transmittance and the highest absorbance percentages were obtained for the sample with 5-layer NiO. Different thicknesses and morphologies of heterostructures explained these situations. In addition, each unique heterostructure of α-Fe2O3/NiO with high visible light absorption nature is perceived to reduce the bandgap energy and has the potential to be used in sensor and solar cell applications.

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Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

Cited by 27 publications

References 22 publications

Fabrication and characterisation of flower‐like ZnO nanostructures grown chemically on flexible PEN substrate

Fabrication and characterisation of flower‐like ZnO nanostructures grown chemically on flexible PEN substrate

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

PHYSICAL PROPERTIES OF NOVEL α-Fe2O3/NiO HETEROSTRUCTURES THROUGH IMMERSION/ SOL–GEL SPIN COATING METHOD: DIFFERENT DEPOSITION NUMBERS OF NiO LAYER

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