Evolution of size and shape of gold nanoparticles during long-time aging

Gubicza, Jenő and Lábár, János and Quynh, Luu Manh and Namc, Nguyen Hoang and Luong, Nguyen Hoang (2013) Evolution of size and shape of gold nanoparticles during long-time aging. MATERIALS CHEMISTRY AND PHYSICS, 138 (2-3). pp. 449-453. ISSN 0254-0584

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Abstract

The evolution of size and shape of gold nanoparticles was studied during long-time aging. The initial particle size of 2e5 nm increased to about 25 nm in one year of storage. It was revealed that the main mechanism of particle growth is Ostwald ripening, however, fusion of particles was also observed. Additionally, while the initial particles have spherical morphology, the grown particles show various shapes such as sphere, bipyramid, decahedron, deca-tetrahedron, triangular plate and rod. Twin boundaries with large frequency of w5% were detected inside the particles which have an important effect on the evolution of morphology. This study suggests that aging may be a new way of tuning size and shape of gold nanoparticles.

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