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Habit-modifying additives and their morphological consequences on photoluminescence and glucose sensing properties of ZnO nanostructures, grown via aqueous chemical synthesis
Linköping University, Department of Science and Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-6235-7038
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2015 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 116, 21-26 p.Article in journal (Refereed) Published
Abstract [en]

Generally, the anisotropic shape of inorganic nano-crystal can be influenced by one or more of different parameters i.e. kinetic energy barrier, temperature, time, and the nature of the capping molecules. Here, different surfactants acting as capping molecules were used to assist the aqueous chemical growth of zinc oxide (ZnO) nanostructures on Au coated glass substrates. The morphology, crystal quality and the photoluminescence (PL) properties of the ZnO nanostructures were investigated. The PL properties of the prepared ZnO nanostructures at room temperature showed a dominant UV luminescence peak, while the "green yellow" emissions were essentially suppressed. Moreover, the ZnO nanostructures were investigated for the development of a glucose biosensor. An adsorbed molecule has direct contribution on the glucose oxidase/ZnO/Au sensing properties. We show that the performance of a ZnO-based biosensor can be improved by tailoring the properties of the ZnO biomolecule interface through engineering of the morphology, effective surface area, and adsorption capability.

Place, publisher, year, edition, pages
Elsevier , 2015. Vol. 116, 21-26 p.
Keyword [en]
ZnO nanostructures; Cationic and anionic molecules; PL spectra; Glucose sensitivity
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-119245DOI: 10.1016/j.vacuum.2015.02.026ISI: 000354582900004OAI: oai:DiVA.org:liu-119245DiVA: diva2:821235
Note

Funding Agencies|University of Kordofan Grant, El-Obeid, Kordofan Sudan [700]

Available from: 2015-06-15 Created: 2015-06-12 Last updated: 2017-12-04
In thesis
1. Chemically Modified Metal Oxide Nanostructures Electrodes for Sensing and Energy Conversion
Open this publication in new window or tab >>Chemically Modified Metal Oxide Nanostructures Electrodes for Sensing and Energy Conversion
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The goal of this thesis is the development of scalable, low cost synthesis of metal oxide nanostructures based electrodes and to correlate the chemical modifications with their energy conversion performance. Methods in energy conversion in this thesis have focused on two aspects; a potentiometric chemical sensor was used to determine the analytical concentration of some components of the analyte solution such as dopamine, glucose and glutamate molecules. The second aspect is to fabricate a photo-electrochemical (PEC) cell. The biocompatibility, excellent electro-catalytic activities and fast electron transfer kinetics accompanied with a high surface area to volume ratio; are properties of some metal oxide nanostructures that of a potential for their use in energy conversion. Furthermore, metal oxide nanostructures based electrode can effectively be improved by the physical or a chemical modification of electrode surface. Among these metal oxide nanostructures are cobalt oxide (Co3O4), zinc oxide (ZnO), and bismuth-zincvanadate (BiZn2VO6) have all been studied in this thesis. Metal oxide nanostructures based electrodes are fabricated on gold-coated glass substrate by low temperature (< 100 0C) wet chemicalapproach. X-ray diffraction, x-ray photoelectron spectroscopy and scanning electron microscopy were used to characterize the electrodes while ultraviolet-visible absorption and photoluminescence were used to investigate the optical properties of the nanostructures. The resultant modified electrodes were tested for their performance as chemical sensors and for their efficiency in PEC activities. Efficient chemically modified electrodes were demonstrated through doping with organic additives like anionic, nonionic or cationic surfactants. The organic additives are showing a crucial role in the growth process of metal oxide nanocrystals and hence can beused to control the morphology. These organic additives act also as impurities that would significantly change the conductivity of the electrodes. However, no organic compounds dependence was observed to modify the crystallographic structure. The findings in this thesis indicate the importance of the use of controlled nanostructures morphology for developing efficient functional materials.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017. 73 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1827
Keyword
Metal oxide nanostructures, mixed metal oxide nano-compound, low temperature wet-chemical growth, chemically modified electrode, doping, surfactant, potentiometric sensor, chemical sensor and photo-electrochemical activity
National Category
Materials Chemistry Inorganic Chemistry Other Chemical Engineering Analytical Chemistry
Identifiers
urn:nbn:se:liu:diva-134275 (URN)10.3384/diss.diva-134275 (DOI)9789176855904 (ISBN)
Public defence
2017-03-03, Sal K3, Kåkenhus, Campus Norrköping, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2017-02-02 Created: 2017-02-02 Last updated: 2017-02-09Bibliographically approved

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Elhag, SamiIbupoto, Zafar HussainKhranovskyy, VolodymyrWillander, MagnusNour, Omer

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Elhag, SamiIbupoto, Zafar HussainKhranovskyy, VolodymyrWillander, MagnusNour, Omer
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