Gold nanoparticles obtained by bio-precipitation from gold(III) solutions

J. L. Gardea-Torresdey, K. J. Tiemann, Gerardo Gamez Goytia, K. Dokken, S. Tehuacanero, M. Jose-Yacaman

Research output: Contribution to journalArticle


The use of metal nanoparticles has shown to be very important in recent industrial applications. Currently gold nanoparticles are being produced by physical methods such as evaporation. Biological processes may be an alternative to physical methods for the production of gold nanoparticles. Alfalfa biomass has shown to be effective at passively binding and reducing gold from solutions containing gold(III) ions and resulting in the formation of gold(0) nanoparticles. High resolution microscopy has shown that five different types of gold particles are present after reaction with gold(III) ions with alfalfa biomass. These particles include: fcc tetrahedral, hexagonal platelet, icosahedral multiple twinned, decahedral multiple twinned, and irregular shaped particles. Further analysis on the frequency of distribution has shown that icosahedral and irregular particles are more frequently formed. In addition, the larger particles observed may be formed through the coalescence of smaller parti
Original languageEnglish
Pages (from-to)397-404
JournalJournal of Nanoparticle Research
StatePublished - Sep 1999


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