Synthesis of Triangular Silver Nanoprisms by Stepwise Reduction of Sodium Borohydride and Trisodium Citrate
Synthesis of Triangular Silver Nanoprisms by Stepwise Reduction of Sodium Borohydride and Trisodium Citrate
复制标题
硼氢化钠和柠檬酸三钠逐步还原合成三角银纳米棱柱
DOI：
10.1021/jp909964k
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发表时间：
2010-02-11
影响因子：
3.7
通讯作者：
Yang, Wensheng
中科院分区：
文献类型：
--
作者：
Dong, Xinyi;Ji, Xiaohui;Yang, Wensheng
通过硼氢化钠（NaBH₄）和柠檬酸三钠逐步还原硝酸银合成了三角形银纳米棱柱。在这种方法中，首先在冰浴温度下用NaBH₄快速还原前驱体来制备小的球形银纳米粒子。加热到70℃后，由于低温下形成的银粒子的催化作用，前驱体的进一步还原有助于形成额外的小球形银纳米粒子。小球形银纳米粒子形成后剩余的前驱体对于促进小纳米粒子的溶解以及它们转化为三角形纳米棱柱是必需的。在前驱体大部分被消耗后，在奥斯特瓦尔德熟化的驱动下，纳米棱柱在形状和尺寸上变得更加均匀。由于纳米棱柱表面的柠檬酸配体很容易被生物分子取代，因此通过这种方法制备的三角形纳米棱柱有望在生物标记中具有潜在用途。
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 surf...