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Sol-gel synthesized zinc oxide nanorods and their structural and optical investigation for optoelectronic application.

Foo KL, Hashim U, Muhammad K, Voon CH - Nanoscale Res Lett (2014)

Bottom Line: Nanostructured zinc oxide (ZnO) nanorods (NRs) with hexagonal wurtzite structures were synthesized using an easy and low-cost bottom-up hydrothermal growth technique.In addition, the calculated results from the specific models of the refractive index are consistent with the experimental data.The ZnO NRs that grew from the 2-methoxyethanol seeded layer exhibited the smallest grain size (39.18 nm), largest diffracted intensities on the (002) plane, and highest bandgap (3.21 eV).

View Article: PubMed Central - HTML - PubMed

Affiliation: Nano Biochip Research Group, Institute of Nano Electronic Engineering (INEE), Universiti Malaysia Perlis (UniMAP), Kangar, Perlis 01000, Malaysia.

ABSTRACT
Nanostructured zinc oxide (ZnO) nanorods (NRs) with hexagonal wurtzite structures were synthesized using an easy and low-cost bottom-up hydrothermal growth technique. ZnO thin films were prepared with the use of four different solvents, namely, methanol, ethanol, isopropanol, and 2-methoxyethanol, and then used as seed layer templates for the subsequent growth of the ZnO NRs. The influences of the different solvents on the structural and optical properties were investigated through scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, and photoluminescence. The obtained X-ray diffraction patterns showed that the synthesized ZnO NRs were single crystals and exhibited a preferred orientation along the (002) plane. In addition, the calculated results from the specific models of the refractive index are consistent with the experimental data. The ZnO NRs that grew from the 2-methoxyethanol seeded layer exhibited the smallest grain size (39.18 nm), largest diffracted intensities on the (002) plane, and highest bandgap (3.21 eV).

No MeSH data available.


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PL spectrum of ZnO NRs grown on different seeded substrate.
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Figure 8: PL spectrum of ZnO NRs grown on different seeded substrate.

Mentions: The effects of solvents on the luminescence properties of ZnO NRs were studied via PL spectroscopy, with excitation of a xenon lamp at 325 nm. Figure 8 shows the typical spectra for the photoluminescence of ZnO NRs that were grown on different seeded substrates. All the samples demonstrated two dominant peaks, which had UV emissions of 300 to 400 nm and visible emissions at 400 to 800 nm. The first emission band that was located in that UV range was caused by the recombination of free excitons through an exciton-exciton collision process [24,64,65]. In addition, the second emission band, which was a broad intense of green emission, originated from the deep-level emission. This band revealed the radiative recombination of the photogenerated hole with the electrons that belonged to the singly ionized oxygen vacancies [66-68].


Sol-gel synthesized zinc oxide nanorods and their structural and optical investigation for optoelectronic application.

Foo KL, Hashim U, Muhammad K, Voon CH - Nanoscale Res Lett (2014)

PL spectrum of ZnO NRs grown on different seeded substrate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4150024&req=5

Figure 8: PL spectrum of ZnO NRs grown on different seeded substrate.
Mentions: The effects of solvents on the luminescence properties of ZnO NRs were studied via PL spectroscopy, with excitation of a xenon lamp at 325 nm. Figure 8 shows the typical spectra for the photoluminescence of ZnO NRs that were grown on different seeded substrates. All the samples demonstrated two dominant peaks, which had UV emissions of 300 to 400 nm and visible emissions at 400 to 800 nm. The first emission band that was located in that UV range was caused by the recombination of free excitons through an exciton-exciton collision process [24,64,65]. In addition, the second emission band, which was a broad intense of green emission, originated from the deep-level emission. This band revealed the radiative recombination of the photogenerated hole with the electrons that belonged to the singly ionized oxygen vacancies [66-68].

Bottom Line: Nanostructured zinc oxide (ZnO) nanorods (NRs) with hexagonal wurtzite structures were synthesized using an easy and low-cost bottom-up hydrothermal growth technique.In addition, the calculated results from the specific models of the refractive index are consistent with the experimental data.The ZnO NRs that grew from the 2-methoxyethanol seeded layer exhibited the smallest grain size (39.18 nm), largest diffracted intensities on the (002) plane, and highest bandgap (3.21 eV).

View Article: PubMed Central - HTML - PubMed

Affiliation: Nano Biochip Research Group, Institute of Nano Electronic Engineering (INEE), Universiti Malaysia Perlis (UniMAP), Kangar, Perlis 01000, Malaysia.

ABSTRACT
Nanostructured zinc oxide (ZnO) nanorods (NRs) with hexagonal wurtzite structures were synthesized using an easy and low-cost bottom-up hydrothermal growth technique. ZnO thin films were prepared with the use of four different solvents, namely, methanol, ethanol, isopropanol, and 2-methoxyethanol, and then used as seed layer templates for the subsequent growth of the ZnO NRs. The influences of the different solvents on the structural and optical properties were investigated through scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, and photoluminescence. The obtained X-ray diffraction patterns showed that the synthesized ZnO NRs were single crystals and exhibited a preferred orientation along the (002) plane. In addition, the calculated results from the specific models of the refractive index are consistent with the experimental data. The ZnO NRs that grew from the 2-methoxyethanol seeded layer exhibited the smallest grain size (39.18 nm), largest diffracted intensities on the (002) plane, and highest bandgap (3.21 eV).

No MeSH data available.


Related in: MedlinePlus