Room-temperature synthesis of gold nanoparticles and nanoplates using Shewanella algae cell extract
Room-temperature synthesis of gold nanoparticles and nanoplates using Shewanella algae cell extract
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DOI：
10.1007/s11051-009-9822-8
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发表时间：
2010-09-01
影响因子：
2.5
通讯作者：
Konishi, Yasuhiro
中科院分区：
文献类型：
--
作者：
Ogi, Takashi;Saitoh, Norizoh;Konishi, Yasuhiro
球形金纳米粒子和金纳米片的生物合成在室温和pH 2.8时，从金属还原细菌希瓦氏藻的细胞提取物被用作还原剂和形状控制剂。细胞提取物，通过超声处理S.藻类细胞，能够在10分钟内还原1 mol/m3的AuCl（4）（-）水溶液离子为元素金，当提供H（2）气体作为电子供体时。生物还原反应开始后的时间间隔被认为是控制生物金纳米颗粒形貌的重要因素。1小时后，有大量的分散良好的球形金纳米粒子，平均尺寸为9.6 nm。在6小时后出现边长为100 nm的金纳米片，并且在24小时后总纳米颗粒群的60%是由于边长为100-200 nm的金纳米片。用S.藻类提取物的含量是用S.藻类由于纳米颗粒形态的变化，所得的生物金纳米颗粒悬浮液显示出颜色的大变化，从淡粉色到紫色。
Biosynthesis of spherical gold nanoparticles and gold nanoplates was achieved at room temperature and pH 2.8 when cell extract from the metal-reducing bacterium Shewanella algae was used as both a reducing and shape-controlling agent. Cell extract, prepared by sonicating a suspension of S. algae cells, was capable of reducing 1 mol/m(3) aqueous AuCl(4) (-) ions into elemental gold within 10 min when H(2) gas was provided as an electron donor. The time interval lapsed since the beginning of the bioreductive reaction was found to be an important factor in controlling the morphology of biogenic gold nanoparticles. After 1 h, there was a large population of well-dispersed, spherical gold nanoparticles with a mean size of 9.6 nm. Gold nanoplates with an edge length of 100 nm appeared after 6 h, and 60% of the total nanoparticle population was due to gold nanoplates with an edge length of 100-200 nm after 24 h. The yield of gold nanoplates prepared with S. algae extract was four times higher than that prepared with resting cells of S. algae. The resulting biogenic gold nanoparticle suspensions showed a large variation in color, ranging from pale pink to purple due to changes in nanoparticle morphology.