Effect of bacterial cellulose on the conversion of copper nanoparticles to Cu2O nanocrystals

Date of Publication

2016

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Biochemistry

Subject Categories

Biochemistry

College

College of Science

Department/Unit

Chemistry

Honor/Award

Glenn V. Alea

Thesis Adviser

Gerardo C. Janairo

Defense Panel Chair

Francisco C. Franco
Derrick Ethelbert C. Yu

Defense Panel Member

Francisco C. Franco

Abstract/Summary

Copper-based nanoparticles specifically nanocrystals were successfully synthesized through the horizontal vapor phase growth technique (HVPGT). Bacterial cellulose (BC) was incorporated with 10% copper overnight and was subjected to in situ reduction reaction approach via the reducing agents: sodium borohydride (NaBH4) and ascorbic acid (AscA). The reduction of copper on BC with sodium borohydride yielded copper nanosphres while reduction via ascorbic acid resulted to copper nanoflakes as seen under the scanning electron microscope (SEM). Characterization of the copper nanoparticles was then conducted via energy dispersive X-ray spectroscopy (EDX) which showed copper composition of approximately 90% and 70% for the nanospheres and nanoflakes respectively. The reduced BC-CU nanocomposites were placed in a quartz tube and was vacuum sealed at a vacuum pressure of approximately 10-5 torr. SEM micrographs of both samples at 1000oC showed incomplete formation of nanoparticles while SEM micrographs at 1200oC showed the formation of Cu2O nanocrystals for the BC-Cu nanocomposite reduced via NaBH4 and irregulary-shaped, spherical and hexagonal planar nanoparticles for the sample reduced via AscA.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU18952

Shelf Location

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

Physical Description

xix, 109 leaves, illustrations (some color), 28 cm.

Keywords

Nanostructured materials; Copper--Assaying

Embargo Period

5-10-2021

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