Antibacterial activity of CUO-ZNO films fabricated via electrophoretic deposition against Escherichia Coli
Date
4-2014
Degree
Bachelor of Science in Applied Physics
College
College of Arts and Sciences (CAS)
Adviser/Committee Chair
Eufrocinio DC. Marfori
Abstract
The anti-bacterial activity of the different CuO-ZnO films against pathogenic Escherichia coli (E. coli) was tested in this study. Six different CuO-ZnO films were fabricated via electrophoretic deposition (EPD) with increasing CuO-ZnO weight ratio. E. coli bacteria media that were cultured in a petri dish were consequently exposed to the different ZnO-CuO films both with and without UV irradiation. Serial dilution method was used in determining the Colony Forming Unit (CFU) of the bacteria during the test for antibacterial activity. The films surface morphology and crystal structure were characterized using SEM and XRD analysis. In this study, among the CuO-ZnO films subjected to UV radiation, the film containing 1% CuO was found to be the most effective in inhibiting E. coli. Tests show that the addition of 1% CuO increased the antibacterial activity of the ZnO film, however, further addition of CuO (3%, 5% and 7%) reduced it. The results suggest that there is an optimum ratio between CuO and ZnO for inhibiting E. coli growth. Using the proper ratio induces the optimal transfer of holes and electrons between the two metal oxides semiconductor, which delays the recombination process and therefore increases the antibacterial performance of the film. The addition of CuO outside this optimum ratio may possibly reduce the generated transfer of holes from ZnO to CuO, and thus reduce the films antibacterial performance.
Language
English
Location
UPLB Main Library Special Collections Section (USCS)
Call Number
LG 993.5 2014 P51 B39
Recommended Citation
Baylon, Aldrich Mark M., "Antibacterial activity of CUO-ZNO films fabricated via electrophoretic deposition against Escherichia Coli" (2014). Undergraduate Theses. 1934.
https://www.ukdr.uplb.edu.ph/etd-undergrad/1934
Document Type
Thesis