Date of Publication

2009

Document Type

Master's Thesis

Degree Name

Master of Science in Physics

Subject Categories

Physics

College

College of Science

Department/Unit

Physics

Thesis Adviser

Reuben V. Quiroga

Defense Panel Chair

Lydia S. Roleda

Defense Panel Member

Edgar A. Vallar
Ivan B. Culaba

Abstract/Summary

Zinc sulfide (ZnS) nanoparticles, jagged-edge nanorods, nanorods, nanofilaments, irregularly-shaped nanosheets, hexagonal nanosheets, nanoflakes, nanowires, nanobelts, nanostrips, nanoribbons, and nanowindmills were successfully synthesized from a minimal amount of 35 mg ZnS powder of 99.9% purity via Horizontal Vapor Phase Crystal Growth (HVPCG) at an 80-min ramp time. The growth temperature was varied from 6000C-12000C in 2000C increment with dwell time set to 4hours, 6hours, and 8hours. The type of nanostructure formed was very sensitive to growth temperature, dwell time as well as quenching. Nanofilaments, nanorods and hexagonal nanosheets morphologies were abundantly produced under several growth conditions while the nanostrips, nanoribbons, jagged-edge nanorods, and nanowindmills occured only at a particular growth temperature, dwell time, and quenching. The effect of quenching on the formation of nanostructure was mostly observed at higher growth temperature and longer dwell time. EDX analyses revealed the atomic composition of the nanostructures. The ratio of Zn to S was close to 1:1. X-ray diffraction test result showed that the deposited nanomaterials with growth temperature of 10000C, dwell time of 4 hours and quenched at ~1.20C had wurtzite or hexagonal crystal structure. Photoluminescence (PL) tests suggested the deficiency in sulfur and quantum confinement of the nanostructures grown at 10000C and 12000C for 4hours, 6hours, and 8hours for both the quenched and unquenched set ups.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG004680

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

vi, 104 leaves ; 28 cm.

Keywords

Zinc sulfide; Nanostructures; Crystal growth

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