Photoreduction of Au(III) to form Au(0) nanoparticles using ferritin as a photocatalyst

Robert J. Hilton; Jeremiah D. Keyes; Richard K. Watt

doi:10.1117/12.847660

30 March 2010 Photoreduction of Au(III) to form Au(0) nanoparticles using ferritin as a photocatalyst

Robert J. Hilton, Jeremiah D. Keyes, Richard K. Watt

Proceedings Volume 7646, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2010; 764607 (2010) https://doi.org/10.1117/12.847660
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

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.

Citation Download Citation

Robert J. Hilton, Jeremiah D. Keyes, and Richard K. Watt "Photoreduction of Au(III) to form Au(0) nanoparticles using ferritin as a photocatalyst", Proc. SPIE 7646, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2010, 764607 (30 March 2010); https://doi.org/10.1117/12.847660

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