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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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ZnO NR growth process.
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Figure 2: ZnO NR growth process.

Mentions: After the uniform coating of the ZnO nanoparticles on the substrate, the ZnO NRs were obtained through hydrothermal growth. The growth solution consisted of an aqueous solution of zinc nitrate hexahydrate, which acted as the Zn2+ source, and hexamethylenetetramine (HMT). The concentration of the Zn (NO3)2 was maintained at 35 mM, and the molar ratio of the Zn (NO3)2 to HMT was 1:1. For the complete dissolution of the Zn (NO3)2 and HMT powder in DIW, the resultant solution was stirred using a magnetic stirrer for 20 min at RT. The ZnO NRs were grown by immersing the substrate with the seeded layer that was placed upside down in the prepared aqueous solution. During the growth process, the aqueous solution was heated at 93°C for 6 h in a regular laboratory oven. After the growth process, the samples were thoroughly rinsed with DIW to eliminate the residual salts from the surface of the samples and then dried with a blower. Finally, the ZnO NRs on the Si substrate were heat-treated at 500°C for 2 h. The growth process of the ZnO NRs is presented in Figure 2.


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)

ZnO NR growth process.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: ZnO NR growth process.
Mentions: After the uniform coating of the ZnO nanoparticles on the substrate, the ZnO NRs were obtained through hydrothermal growth. The growth solution consisted of an aqueous solution of zinc nitrate hexahydrate, which acted as the Zn2+ source, and hexamethylenetetramine (HMT). The concentration of the Zn (NO3)2 was maintained at 35 mM, and the molar ratio of the Zn (NO3)2 to HMT was 1:1. For the complete dissolution of the Zn (NO3)2 and HMT powder in DIW, the resultant solution was stirred using a magnetic stirrer for 20 min at RT. The ZnO NRs were grown by immersing the substrate with the seeded layer that was placed upside down in the prepared aqueous solution. During the growth process, the aqueous solution was heated at 93°C for 6 h in a regular laboratory oven. After the growth process, the samples were thoroughly rinsed with DIW to eliminate the residual salts from the surface of the samples and then dried with a blower. Finally, the ZnO NRs on the Si substrate were heat-treated at 500°C for 2 h. The growth process of the ZnO NRs is presented in Figure 2.

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