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Efficient Donor Impurities in ZnO Nanorods by Polyethylene Glycol for Enhanced Optical and Glutamate Sensing Properties
Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
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 Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
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2016 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 16, no 2Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

In this paper, we show that the possibility of using polyethylene glycol (EG) as a hydrogen source and it is used to assist the hydrothermal synthesis of ZnO nanorods (ZNRs). EG doping in ZNRs has been found to significantly improve their optical and chemical sensing characteristics toward glutamate. The EG was found to have no role on the structural properties of the ZNRs. However, the x-ray photoelectron spectroscopy (XPS) suggests that the EG could induce donor impurities effect in ZnO. Photoluminescence (PL) and UV-Vis. spectra demonstrated this doping effect. Mott-Schottky analysis at the ZNRs/electrolyte interface was used to investigate the charge density for the doped ZNRs and showed comparable dependence on the used amount of EG. Moreover, the doped ZNRs were used in potentiometric measurements for glutamate for a range from 10(-6) M to 10(-3) M and the potential response of the sensor electrode was linear with a slope of 91.15 mV/decade. The wide range and high sensitivity of the modified ZNRs based glutamate biosensor is attributed to the doping effect on the ZNRs that is dictated by the EG along with the high surface area-to-volume ratio. The findings in the present study suggest new avenues to control the growth of n-ZnO nanostructures and enhance the performance of their sensing devices.

Place, publisher, year, edition, pages
MDPI AG , 2016. Vol. 16, no 2
Keyword [en]
potentiometric sensor; ZnO nanorods; glutamate; doping
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Chemical Sciences Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-126849DOI: 10.3390/s16020222ISI: 000371787800096PubMedID: 26861342OAI: oai:DiVA.org:liu-126849DiVA: diva2:917168
Note

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

Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2017-11-30
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)
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Available from: 2017-02-02 Created: 2017-02-02 Last updated: 2017-02-09Bibliographically approved

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Elhag, SamiKhun, KimleangKhranovskyy, VolodymyrLiu, XianjieWillander, MagnusNour, Omer

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