Growth of ZnO films via spray pyrolysis deposition route for methylene blue photodegradation

  • Debinya Banisal Buenafe Materials Science and Engineering Program, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Arven I. Cafe National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Christopher Jude T. Vergara Materials Science and Engineering Program, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Efren M. Suratos, Jr. Materials Science and Engineering Program, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Horace Andrew F. Husay National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Laureen Ida M. Ballesteros Materials Science and Engineering Program, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Aian B. Ontoria Materials Science and Engineering Program, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Rontgen B. Gapusan Materials Science and Engineering Program, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Arnel A. Salvador National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • Armando S. Somintac National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines

Abstract

Growth and photodegradation acitvity of zinc oxide films deposited via spray pyrolysis were investigated. Raman spectroscopy of the samples displayed the phonon modes with E2(high) at 437cm-1 as the most prominent mode confirming wurtzite structure of ZnO. The vibration due to E1(LO) mode indicated that the sample grown at 250°C had exhibited a presence of defects in the film. Scanning electron microscopy images revealed that the films deposited at different substrate heating temperatures have distinct surface morphologies. The grain size and grain structures can determine the surface area to volume ratio which is important in the photocatalytic reaction. UV-visible spectroscopy have showed that the transmittance of the films at the visible region increased with growth temperature. The ZnO films have an onset of absorption at around 390-411 nm which can be related to its calculated band gap from 3.01-3.15 eV. The sample grown at a substrate temperature of 250°C exhibited the highest absorbance in the UV region among the grown ZnO films. It also performed the highest degradation of methylene blue solution with the highest degradation efficiency of 91% and the highest rate of degradation in one hour irradiation.

Published
2017-06-07
How to Cite
[1]
D. Buenafe, A. Cafe, C. J. Vergara, E. Suratos, H. A. Husay, L. I. Ballesteros, A. Ontoria, R. Gapusan, A. Salvador, and A. Somintac. Growth of ZnO films via spray pyrolysis deposition route for methylene blue photodegradation, Proceedings of the Samahang Pisika ng Pilipinas 35, SPP-2017-PA-37 (2017). URL: https://paperview.spp-online.org/proceedings/article/view/264.
Section
Poster Session A (Materials Science, Instrumentation, and Photonics)