A novel, rapid, seedless, in situ synthesis method of shape and size controllable gold nanoparticles using phosphates
A novel, rapid, seedless, in situ synthesis method of shape and size controllable gold nanoparticles using phosphates
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DOI：
10.1038/s41598-019-43921-0
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发表时间：
2019-05-15
影响因子：
4.6
通讯作者：
Tian, Furong
中科院分区：
文献类型：
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作者：
Liu, Kangze;He, Zhonglei;Tian, Furong
在此，我们报道了一种快速、原位、无籽金纳米颗粒的合成方法。与目前使用的大多数尺寸和形状可控的合成方法不同，它在室温下一步完成，大约在15分钟内完成。用N-2-hydroxyethylpiperazine-N-2-ethanesulphonic酸还原Au(III)的标准合成方法可在15min内合成70 nm左右的金纳米球和宽度为10 0~10 0 0 nm的金纳米片，而添加磷酸二钠(Na2HPO4)或磷酸二钠(NaHPO4)可分别合成金纳米花或较小的金纳米球和金纳米片的混合物.增加磷酸盐的添加浓度可以显著地将金纳米颗粒的形成时间缩短到几秒钟。通过增大Na2HPO4：HEPES和NaHPO4：HEPES的摩尔比，可以将金纳米花和金纳米混合物的尺寸分别从接近60 nm降至1 nm和从接近70 nm降至接近2.5 nm。伴随着系统性结构变化的是与表面等离子体共振相关的类似系统性颜色变化。并对合成过程的机理进行了探讨。
We hereby report a novel synthesis method of size and shape controllable gold nanoparticles that is rapid, in situ and seedless. Unlike most currently employed size and shape controllable synthesis methods, it takes place in a single step under room temperature within similar to 15 minutes. While mixtures of gold nanospheres around 70 nm and gold nanoplates with width ranging from 100 nm to 1000 nm can be synthesized in about 15 minutes by standard synthesis method using N-2-hydroxyethylpiperazine-N-2-ethanesulphonic acid (HEPES) to reduce Au(III), gold nanoflowers or mixtures of smaller gold nanospheres and nanoplates can be synthesized with the addition of disodium phosphate (Na2HPO4) or monosodium phosphate (NaH2PO4), respectively. Increasing the concentration of phosphate added significantly reduces the formation time of gold nanoparticles to seconds. By increasing the molar ratio of Na2HPO4: HEPES and NaH2PO4: HEPES, the size of gold nanoflowers and gold nanoparticle mixtures can be tuned from similar to 60 nm down to 1 nm and from similar to 70 nm to similar to 2.5 nm, respectively. The systematic structural changes are accompanied by similarly systematic colour changes associated with shifting of the surface plasmon resonance. The proposed mechanism of the synthesis process is also presented.