Optical properties of zinc oxide deposited via colloidal precipitation

Date

4-2013

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Lou Serafin M. Lozada

Abstract

In this paper, optical properties of zinc oxide grown on a glass substrate via layer by layer colloidal precipitation method at different deposition cycles are described. The glass substrate was alternately immersed for 3 seconds in zinc oxide solution and 5 seconds in water for rinsing, both at an 80° heat bath, at different deposition cycles (100, 200, and 300) using an automated dipping machine. Brewster's angle of the deposit significantly increase as the number of deposition cycles is increased (100 dc =56:58°, 200 dc = 57:08°, and 300 dc = 57:50°). Broadening of the reactance curve around the Brewster's dip was observed with the 300 deposition cycle having the most prominent shift. Transmittance spectra has shown a general decrease in the intensity as the number of deposition cycles was increased. Also broadening at around 335 nm, shifting from 412 nm to 414 nm and shifting from 398 nm to 394 nm were observed suggesting a change in optical properties of the zinc oxide as the number of deposition cycle is increased. Decrease in the transmittance and formation of shoulder around 380 nm to 390 nm suggests larger particles were deposited as the number of deposition cycle was increased. The transmittance of the solution have shown a general decrease in the transmittance intensity as time increases. Narrowing and weakening of the band around 418 nm and blue shifting of the peak at 390 nm was observed indicating change in the optical properties of the particles in the solution. Scattering profile of the samples have shown to have a scattering angle between -10° to 10°. In conclusion, the study has shown that the number of deposition cycles allows for the control of optical properties the zinc oxide deposited glass substrate. However, Ostwald ripening accounts for the non-uniformity of the produced films and requires steric stabilization of the solution in order to attain a uniform deposition of the zinc oxide onto the substrate as a function of time.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2013 P51 /G38

Document Type

Thesis

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