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

Authors

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

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.

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Issue

2017: Proceedings of the 35th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2017-PA-37

Section

Poster Session A (Materials Science, Instrumentation, and Photonics)

Published

2017-06-07

How to Cite

[1]

DB Buenafe, AI Cafe, CJT Vergara, EM Suratos, HAF Husay, LIM Ballesteros, AB Ontoria, RB Gapusan, AA Salvador, and AS 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://proceedings.spp-online.org/article/view/264.