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Journal of Electronic Materials

, Volume 48, Issue 3, pp 1604–1611 | Cite as

Chemical Sensing Performance of Flower-Like ZnO/PSi Nanostructures via Electrochemical Impedance Spectroscopy Technique

  • Ramazanali DalvandEmail author
  • Shahrom Mahmud
  • Azman Seeni
Article
  • 54 Downloads

Abstract

ZnO nanostructures were synthesized on porous Si (PSi) structures using a method developed by this study known as electric field-assisted aqueous solution technique. The detailed characterization of this nanostructure was performed using atomic force microscopy, field emission scanning electron microscopy, x-ray diffraction, room-temperature photoluminescence and Raman spectroscopy. Electrochemical impedance spectroscopy (EIS) technique was used to detect two classifications of chemical solvents, namely polar and non-polar solvents. Nyquist plots in EIS were utilized to detect chemical solvents (ethanol, acetone, toluene and benzene) exposed to ZnO/PSi nanostructure arrays. The results showed that the grown flower-like ZnO nanostructure arrays served as good chemical sensors with high sensitivity and low power consumption. Meanwhile, the ZnO/PSi nanoflowers exposed to ethanol showed the highest sensitivity (94.6% response) compared to other chemical solutions with the least response exhibited by benzene (68.4% response). It was postulated that the interaction between the solution and oxygen species of ZnO/PSi nanostructure surface induced a resistance change resulting in the release of free electrons that migrated to the conduction band of ZnO/PSi nanoflower structures and reduced the number of surface-adsorbed oxygen species. Subsequently, the changes observed in the Nyquist semicircle diameter and Warburg impedance led to the chemical sensing response.

Keywords

Chemical sensors electric field-assisted aqueous solution technique electrochemical impedance spectroscopy Nyquist plot ZnO/PSi nanoflower 

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Notes

Acknowledgments

We acknowledge financial support from an ERGS grant (203/PFIZIK/6730100) from the Malaysian Government.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Ramazanali Dalvand
    • 1
    • 2
    Email author
  • Shahrom Mahmud
    • 1
  • Azman Seeni
    • 3
  1. 1.Institute of Nano-Optoelectronic Research and Technology, School of PhysicsUniversiti Sains MalaysiaPulau PinangMalaysia
  2. 2.Department of PhysicsLorestan UniversityKhoramabadIran
  3. 3.Cluster of Integrative Medicine, Advanced Medical and Dental InstituteUniversiti Sains MalaysiaBertamMalaysia

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