High yield synthesis of single-crystalline gold nanoplates using the metal ion-reducing bacteria

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Gold nanoplates were prepared in high yield at room temperature using the Fe(III)-reducing bacterium <i>Shewanella algae</i>. The cell extract, prepared by sonicating a suspension of <i>S</i>. <i>algae</i> cells, plays an important role in improving productivity of gold nanoplates. <i>S. algae</i> cell extract was capable of reducing aqueous AuCl<sub>4</sub><sup>-</sup> ions into elemental gold within 60 min when H<sub>2</sub> gas was provided as an electron donor. Gold nanoplates with an edge length of 100 nm appeared after 6 hours, and compact gold nanoplates with an edge length of 100-200 nm were obtained after 24 hours. The prepared nanoplates had diffraction spots characteristic of single-crystalline (111)-oriented gold nanocrystal. Using <i>S. algae </i>cell extract, the yield of gold nanoplates relative to the total nanoparticle population was 60 %, which was four times higher than that obtained with a suspension of resting cells. Following centrifugal ultrafiltration of the <i>S. algae</i> extract, only the fraction containing biomolecules greater than 50 kDa successfully produced gold nanoplates.


  • Transactions of the Materials Research Society of Japan

    Transactions of the Materials Research Society of Japan 35(1), 19-22, 2010

    The Materials Research Society of Japan


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