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A.S. Ismail
Universiti Teknologi MARA (UiTM)

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Impact of annealing temperature to the performance of hematite based humidity sensor W.R.W. Ahmad; M.H. Mamat; Z. Khusaimi; A.S. Ismail; M. Rusop
Indonesian Journal of Electrical Engineering and Computer Science Vol 13, No 3: March 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v13.i3.pp1079-1086

Abstract

In the present study, hematite (α-Fe2O3) nanorod structure were grown on fluorine doped tin oxide coated glass substrate via sonicated immersion approach with variation of annealing temperature (350˚C – 600˚C) in one-hour treatment. The impact of varying the temperature of annealing treatment on crystalline phase, structure morphology, optical properties and humidity sensing performance of hematite were examined. X-ray diffraction pattern disclosed a rhombohedral structure with α-phase diffraction peaks. The surface morphology images taken from field emission scanning electron microscopy revealed that the hematite nanorod arrays were grown uniformly in all samples and the average diameters of nanorods were measured in the ranges between 55 and 80 nm. Ultraviolet–visible spectroscopy measurement spectra show that all samples exhibited good optical properties. The hematite humidity sensor sample annealed at 400°C has demonstrated the highest sensitivity response (S=177.78) to humidity range between 40%RH to 90%RH.
Intrinsic ZnO/Al-doped ZnO Homojunction: Structural and Optical Properties A.S. Ismail; M.H. Mamat; M.F. Malek; M.M. Yusoff; N.D. Md. Sin; S.S. Shariffudin; A.S. Zoolfakar; A.B. Suriani; M.K. Ahmad; I. B. Shameem Banu; M. Rusop
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 1: October 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i1.pp393-398

Abstract

Intrinsic zinc oxide (ZnO)/Al-doped ZnO (AZO) homojunction film was prepared using two-step immersion processes. The film was characterized using field emission scanning electron microscopy, X-ray diffraction (XRD), Raman spectroscopy, and ultraviolet–visible spectrophotometer to investigate their structural and optical properties. The surface morphology image displays that the ZnO deposited on the nanorod surfaces in layer form with average diameter of nanorods about 95 nm. The structural properties of XRD pattern demonstrate that the film possessed good crystallinity with the preferred orientation at (002) plane. The film also possessed excellent absorption in the ultraviolet (UV) region with optical band gap energy of 3.22 eV. These results indicate that the film has a good potential for optical-based device such a UV sensor.
Co-Authors A.B. Suriani A.S. Zoolfakar I. B. Shameem Banu M. Rusop M.F. Malek M.H. Mamat M.K. Ahmad M.M. Yusoff N.D. Md. Sin S.S. Shariffudin W.R.W. Ahmad Z. Khusaimi