Electrodeposition of zinc oxide for carbon monoxide sensing.

Date

4-2012

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Emmanuel A Florido

Abstract

ZuO films were successfully fabricated through electrophoretic deposition. six(6) samples were prepared with different applied voltages. The electrical response of the samples were investigated upon exposure to different concentrations of CO at 26.5 0C. Samples applied with higher voltages obtained higher mass of deposits and had higher sensitivities. All samples were reversible and their sensitivities were higher at greater concentrations of CO. Samples 6 (applied with 600V) had the highest mass of deposits (15 mg) and was the most sensitive while sample 1 (100V) was the least (1mg). The morphology of samples 1 and 6 were analyzed and compared through SEM which revealed that the ZuO deposits of both samples were porous. The higher gas response of sample 6 could be accounted to the smaller size (nanometric) of its particles (III.45 nm in average) and thicker layer (8.82 un in average) of its ZnO deposites compared to sample 1 (399.1 nm and 1.51 um respectively). Sensitivity could also be attributed to the particle size. porosity, mass of deposits and the concentration of analyte gas. Obtaining more mass of Zno deposits and the exposure to greater concentrations of CO can lead to a better sensitivity because more ZnO particles and CO molecules can perform and contribute to gas sensing. Reducing the size of ZnO particles to the nanometric scale enhances its sensing properties due to an increase of surface to volume ratio which allows more particles to interact with the molecules of an analyte gas.

PACS: 61.64.Df (Structures of nanocrystals and nanoparticles), 81.07.Dz (II-VI Semiconductors) 81.15.Pq (Electrodeposition)

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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