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Synthesis of linear ZnO structures by a thermal decomposition method and their characterisation.

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Title: Synthesis of linear ZnO structures by a thermal decomposition method and their characterisation.
Authors: Devarepally, K., Cox, D., Fry, A.1, Stolojan, V.2, Curry, R.2, Munz, M.3 martin.munz@npl.co.uk
Source: Journal of Materials Science. Feb2012, Vol. 47 Issue 4, p1893-1901. 9p. 5 Black and White Photographs, 2 Charts, 3 Graphs.
Subjects: Zinc oxide, Semiconductor characterization, Chemical synthesis, Trioctylamine, Methenamine, Materials science, Chemical decomposition, Structural analysis (Science)
Abstract: The semiconductor zinc oxide (ZnO) is a promising material for applications in optoelectronics, photochemistry and chemical sensing. Furthermore, ZnO structures can be grown with a large variety of sizes and shapes. Devices with ZnO rods or wires as their core elements can be used in solar cells, gas sensors or biosensors. In this article, an easy approach for the non-aqueous wet chemical synthesis of ZnO structures is presented that employs the solvent trioctylamine (TOA) and the surfactant hexamethylenetetramine (HMTA). Using the thermal decomposition method, rod-shaped structures were grown that are suitable for the fabrication of electrical devices. A detailed study was carried out to investigate the effects of various reaction parameters on the growth process. Both the concentration of the surfactant HMTA and the zinc precursor zincacetylacetonate (Zn(acac)) were found to show strong effects on the resulting morphology. In addition to structural characterisation using XRD, SEM and TEM, also optical properties of rod-shaped ZnO structures were measured. Rod-shaped structures were obtained for the following conditions: reaction time 4 h, reaction temperature 70 °C, 1 mmol of Zn(acac), 4 mmol of HMTA and 25 mL of the solvent TOA. Photoluminescence and photoluminescence excitation spectroscopy of samples grown under these conditions provided information on levels of defect states that could be critical for chemical sensing applications. Two narrow peaks around 254 and 264 nm were found that are well above the band gap of ZnO. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Synthesis of linear ZnO structures by a thermal decomposition method and their characterisation.
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  Data: <searchLink fieldCode="AR" term="%22Devarepally%2C+K%2E%22">Devarepally, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Cox%2C+D%2E%22">Cox, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Fry%2C+A%2E%22">Fry, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Stolojan%2C+V%2E%22">Stolojan, V.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Curry%2C+R%2E%22">Curry, R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Munz%2C+M%2E%22">Munz, M.</searchLink><relatesTo>3</relatesTo><i> martin.munz@npl.co.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Feb2012, Vol. 47 Issue 4, p1893-1901. 9p. 5 Black and White Photographs, 2 Charts, 3 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Zinc+oxide%22">Zinc oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Semiconductor+characterization%22">Semiconductor characterization</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+synthesis%22">Chemical synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Trioctylamine%22">Trioctylamine</searchLink><br /><searchLink fieldCode="DE" term="%22Methenamine%22">Methenamine</searchLink><br /><searchLink fieldCode="DE" term="%22Materials+science%22">Materials science</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+decomposition%22">Chemical decomposition</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+analysis+%28Science%29%22">Structural analysis (Science)</searchLink>
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  Data: The semiconductor zinc oxide (ZnO) is a promising material for applications in optoelectronics, photochemistry and chemical sensing. Furthermore, ZnO structures can be grown with a large variety of sizes and shapes. Devices with ZnO rods or wires as their core elements can be used in solar cells, gas sensors or biosensors. In this article, an easy approach for the non-aqueous wet chemical synthesis of ZnO structures is presented that employs the solvent trioctylamine (TOA) and the surfactant hexamethylenetetramine (HMTA). Using the thermal decomposition method, rod-shaped structures were grown that are suitable for the fabrication of electrical devices. A detailed study was carried out to investigate the effects of various reaction parameters on the growth process. Both the concentration of the surfactant HMTA and the zinc precursor zincacetylacetonate (Zn(acac)) were found to show strong effects on the resulting morphology. In addition to structural characterisation using XRD, SEM and TEM, also optical properties of rod-shaped ZnO structures were measured. Rod-shaped structures were obtained for the following conditions: reaction time 4 h, reaction temperature 70 °C, 1 mmol of Zn(acac), 4 mmol of HMTA and 25 mL of the solvent TOA. Photoluminescence and photoluminescence excitation spectroscopy of samples grown under these conditions provided information on levels of defect states that could be critical for chemical sensing applications. Two narrow peaks around 254 and 264 nm were found that are well above the band gap of ZnO. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10853-011-5978-6
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      – SubjectFull: Zinc oxide
        Type: general
      – SubjectFull: Semiconductor characterization
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      – SubjectFull: Chemical synthesis
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      – SubjectFull: Materials science
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      – SubjectFull: Chemical decomposition
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      – SubjectFull: Structural analysis (Science)
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      – TitleFull: Synthesis of linear ZnO structures by a thermal decomposition method and their characterisation.
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              Text: Feb2012
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