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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Synthesis of Triangular Silver Nanoprisms by Stepwise Reduction of Sodium Borohydride and Trisodium Citrate
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Synthesis of Triangular Silver Nanoprisms by Stepwise Reduction of Sodium Borohydride and Trisodium Citrate

机译：逐步还原硼氢化钠和柠檬酸三钠的合成三角形银纳米棱镜

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摘要

Triangular silver nanoprisms were synthesized by stepwise reduction of silver nitrate with sodium borohydride (NaBH4) and trisodium citrate. In this approach, first small spherical silver nanoparticles were prepared by the rapid reduction of the precursor with NaBH4 at ice-bath temperature. After being heated to 70 °C, further reduction of the precursor contributed to the formation of additional small spherical silver nanoparticles attributed to the catalysis effect of the silver particles formed at the low temperature. The residual precursor after the formation of the small spherical silver nanoparticles is necessary to promote the dissolution of the small nanoparticles and their transformation into the triangular nanoprisms. After consumption of most of the precursor, the nanoprisms became more uniform in shape and size driven by the Ostwald ripening. The triangular nanoprisms prepared by such an approach are expected to be potentially useful in biolabeling since the citrate ligand on the nanoprism surface is ready to be replaced by biomolecules.
机译：通过用硼氢化钠（NaBH4）和柠檬酸三钠逐步还原硝酸银，可以合成三角形的银纳米棱镜。在这种方法中，通过在冰浴温度下用NaBH4快速还原前体制备了第一个小的球形银纳米颗粒。加热到70°C后，前体的进一步还原有助于形成额外的小球形银纳米颗粒，这归因于在低温下形成的银颗粒的催化作用。小球形银纳米颗粒形成后的残留前驱物对于促进小纳米颗粒的溶解及其向三角形纳米棱镜的转化是必需的。在消耗了大多数前驱物后，纳米棱镜的形状和尺寸变得更加均匀，这是由奥斯特瓦尔德（Ostwald）成熟驱动的。通过这种方法制备的三角形纳米棱镜有望在生物标记中有用，因为纳米棱镜表面的柠檬酸盐配体已准备好被生物分子替代。

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