Share Email Print

Proceedings Paper

Photoreduction of Au(III) to form Au(0) nanoparticles using ferritin as a photocatalyst
Author(s): Robert J. Hilton; Jeremiah D. Keyes; Richard K. Watt
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Gold metal nanoparticles have applications in bio sensing technology, nano-tube formation, and cancer therapy. We report attempts to synthesize gold nanoparticles within the ferritin cavity (8 nm) or to use ferritin as a scaffold for coating gold on the outside surface (12 nm). The intrinsic iron oxide core of ferritin is a semi-conductor and light can excite electrons to a conduction band producing a powerful reductant when a sacrificial electron donor fills the electron hole. We present a method using ferritin to photo chemically reduce Au(III) to metallic gold nanoparticles. During initial studies we observed that the choice of buffers influenced the products that formed as evidenced by a red product formed in TRIS and a purple produce formed in MOPS. Gold nanoparticles formed in MOPS buffer in the absence of illumination have diameters of 15-30 nm whereas illumination in TRIS buffer produced 5-10 nm gold nanoparticles. Increases in temperature cause the gold nanoparticles to form more rapidly. Chemical reduction and photochemical reduction methods have very different reaction profiles with photochemical reduction possessing a lag phase prior to the formation of gold nanoparticles.

Paper Details

Date Published: 30 March 2010
PDF: 10 pages
Proc. SPIE 7646, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2010, 764607 (30 March 2010); doi: 10.1117/12.847660
Show Author Affiliations
Robert J. Hilton, Brigham Young Univ. (United States)
Jeremiah D. Keyes, Brigham Young Univ. (United States)
Richard K. Watt, Brigham Young Univ. (United States)

Published in SPIE Proceedings Vol. 7646:
Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2010
Vijay K. Varadan, Editor(s)

© SPIE. Terms of Use
Back to Top