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Influence of pH, Precursor Concentration, Growth Time, and Temperature on the Morphology of ZnO Nanostructures Grown by the Hydrothermal Method
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. (Fysikalisk elektronik och Nanoteknologi / Physical Electronics and nanotechnology)
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. (Fysikalisk elektronik och Nanoteknologi / Physical Electronics and nanotechnology)
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. (Fysikalisk elektronik och Nanoteknologi / Physical Electronics and nanotechnology)
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. (Fysikalisk elektronik och Nanoteknologi / Physical Electronics and nanotechnology)
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2011 (English)In: Journal of Nanomaterials, ISSN 1687-4110, E-ISSN 1687-4129, no 269692Article in journal (Refereed) Published
Abstract [en]

We investigated the influence of the pH value, precursor concentration (C), growth time and temperature on the morphology of zinc oxide (ZnO) nanostructures. The pH of the starting solution was varied from1.8 to 12.5. It was found that the final pH reaches an inherent value of 6.6 independently of the initial pH solution. Various ZnO structures of nanotetrapod-like, flower-like, and urchin-like morphology were obtained at alkaline pH (8 to 12.5) whereas for pH solution lower than 8 rod-like nanostructures occurred. Moreover, we observed the erosion of the nanorods for a pH value less than 4.6. By changing the concentrations the density and size were also varied. On going from a high (C > 400mM) to lower (C < 25mM) C, the resulted ZnO nanostructures change from a film to nanorods (NRs) and finally nanowires (NWs). It was also found that the length and diameter of ZnO NRs follow a linear relation with time up to 10 hours, above which no further increase was observed. Finally the effect of growth temperature was seen as an influence on the aspect ratio.

Place, publisher, year, edition, pages
NY, USA: Hindawi Publishing Corporation, 2011. no 269692
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-74729DOI: 10.1155/2011/269692ISI: 000298424100001OAI: oai:DiVA.org:liu-74729DiVA: diva2:491028
Note
funding agencies|advanced Functional Material project Sweden||Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2017-12-08Bibliographically approved
In thesis
1. ZnO and CuO Nanostructures: Low Temperature Growth, Characterization, their Optoelectronic and Sensing Applications
Open this publication in new window or tab >>ZnO and CuO Nanostructures: Low Temperature Growth, Characterization, their Optoelectronic and Sensing Applications
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One dimensional (1-D), zinc oxide (ZnO) and copper (II) oxide (CuO), nanostructures have great potential for applications in the fields of optoelectronic and sensor devices. Research on nanostructures is a fascinating field that has evolved during the last few years especially after the utilization of the hydrothermal growth method. Using this method variety of nanostructures can be grown from solutions, it is a cheap, easy, and environment friendly approach. These nanostructures can be synthesized on various conventional and nonconventional substrates such as silicon, plastic, fabrics and paper etc.

The primary purpose of the work presented in this thesis is to realize controllable growth of ZnO, CuO and nanohybrid ZnO/CuO nanostructures and to process and develop white light emitting diodes and sensor devices from the corresponding nanostructures.

The first part of the thesis deals with ZnO nanostructures grown under different hydrothermal conditions in order to gain a better understanding of the growth. Possible parameters affecting the growth such as the pH, the growth temperature, the growth time, and the precursors  concentration which can alter the morphology of the nanostructures were investigated (paper 1). Utilizing the advantage of the low temperature for growth we synthesized ZnO nanostructures on different substrates, specifically on flexible substrates, which are likely to be integrated with flexible organic substrates for future foldable and disposable electronics (paper 2, 3).

In the second part of the thesis, using the results and findings from the growth of ZnO nanostructures, it was possible to successfully implement ZnO nanostructures for white light emitting diodes (LEDs) on different flexible substrates (paper 4, 5).

In paper 4 we realized a ZnO/polymer LED grown on a paper substrate. In paper 5 we extended the idea to print the ZnO nanorods/polymer hybrid LEDs with potential application to large area flexible displays.

In the last part of the thesis, CuO and nanohybrid ZnO/CuO nanostructures were utilized to fabricate Ag+ detection and humidity sensors. In paper 6 we reported Ag+ selective electrochemical sensor based on the use of functionalized CuO nanopetals. To combine the advantages of both oxides nanostructures and to improve the performance we fabricated a pn-heterojuction using intrinsic n-ZnO nanorods and p-CuO nanostructures which were then utilized as an efficient humidity sensor (paper 7).

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 66 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1441
Keyword
Zinc oxide, Copper (II) oxide, Nanostructures, Hydrothermal growth, Light emitting diodes.
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-76677 (URN)978-91-7519-912-2 (ISBN)
Public defence
2012-05-11, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2012-04-16 Created: 2012-04-16 Last updated: 2014-01-15Bibliographically approved

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