Defects-controlled ZnO nanorods with high aspect ratio for ethanol detection

Noor J. Ridha, Mohammad Hafizuddin Jumali, Ali Umar Akrajas, F. Alosfur

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A simple method to simultaneously control the aspect ratios and defects in vertically grown ZnO nanorods arrays on Si substrate was demonstrated in this work. The nanorods were grown on the substrate using seed mediated growth method by varying the number of growth solution while other parameters were kept constant. The samples were characterized by X- ray Diffraction (XRD), Energy-Dispersive X-ray (EDX), Field Emission Scanning Electron Microscope (FE-SEM) and Photoluminecence spectroscopy (PL). XRD results confirmed the presence of wurtzite ZnO structure grown strongly perpendicular to the surface of the substrate. The FE-SEM images revealed that the ZnO nanorods length increased with the number of fresh growth solutions suggesting faster growth along c axis while diameter almost unchanged. The aspect ratio of ZnO nanorod arrays exhibited strong dependency on the number of fresh solution where it was improved from 40 to 60. The possible growth mechanism of ZnO nanorods was discussed. PL emission spectrum displayed systematic reduction in broad green emission band with higher number of growth solution signifying lower defects in the nanorods. Gas sensing performance was investigated as a function of operating temperature, time and gas concentration. High sensitivity, stability and repeatability were achieved. In addition, the predicated gas sensing mechanism of ZnO nanorods was also discussed.

Original languageEnglish
Pages (from-to)4583-4594
Number of pages12
JournalInternational Journal of Electrochemical Science
Volume8
Issue number4
Publication statusPublished - Apr 2013

Fingerprint

Nanorods
Aspect ratio
Ethanol
Defects
Gases
Field emission
Electron microscopes
Substrates
Scanning
X ray diffraction
Emission spectroscopy
Seed
Spectroscopy
X rays

Keywords

  • Aspect ratio
  • Multiple solutions
  • Zinc oxide nanorod

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Defects-controlled ZnO nanorods with high aspect ratio for ethanol detection. / Ridha, Noor J.; Jumali, Mohammad Hafizuddin; Akrajas, Ali Umar; Alosfur, F.

In: International Journal of Electrochemical Science, Vol. 8, No. 4, 04.2013, p. 4583-4594.

Research output: Contribution to journalArticle

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