Bovine serum albumin assisted preparation of ultra-stable gold nanoflowers and their selective Raman response to charged dyes.
Bovine serum albumin assisted preparation of ultra-stable gold nanoflowers and their selective Raman response to charged dyes.
复制标题
牛血清白蛋白协助制备超稳定的金纳米流量及其对带电染料的选择性拉曼反应。
作者：
在这项工作中，我们展示了一种简便的一锅法制备金纳米花的方法，该方法以四氯金酸为金前驱体，抗坏血酸为还原剂，牛血清白蛋白(BSA)为配体。研究发现，所制备的金纳米粒子的形貌依赖于反应溶液中牛血清白蛋白的浓度。结果表明，BSA引导了Au纳米颗粒沿<111>方向的择优生长，促进了Au纳米颗粒的各向异性生长，从而形成了Au纳米花。随着BSA浓度的增加，金前驱体的反应性降低，形成尺寸增大的Au纳米花，这也可以通过减少还原剂的加入量来获得。Au纳米花在酸性pH条件下，在氯离子存在下超稳定，适合于根据牛血清白蛋白表面的等电点(∼4.7)，通过表面增强拉曼散射来选择性地检测相反电荷的染料。在这项工作中，我们展示了一种简便的一锅法制备金纳米花的方法，该方法以四氯金酸为金前驱体，抗坏血酸为还原剂，牛血清白蛋白(BSA)为配体。
In this work, we demonstrated a facile, one-pot approach for preparation of gold nanoflowers by using tetrachloroauric acid as a gold precursor, ascorbic acid as a reductant, and bovine serum albumin (BSA) as a ligand. It was found that the morphology of the as-prepared gold nanoparticles (Au NPs) was dependent on the concentration of BSA introduced into the reaction solutions. It is identified that BSA directed the preferential growth along the 〈111〉 direction, which contributed to the anisotropic growth of Au NPs and thus the formation of Au nanoflowers. An increased concentration of BSA reduced the reactivity of the gold precursor, leading to the formation of Au nanoflowers with increased size, which could also be obtained by decreasing the amount of reductant added. The Au nanoflowers were ultra-stable in the presence of chloride ions under acidic pH, making them suitable for selective detection of oppositely charged dyes via surface-enhanced Raman scattering according to the isoelectric point (∼4.7) of BSA capped on their surface. In this work, we demonstrated a facile, one-pot approach for preparation of gold nanoflowers by using tetrachloroauric acid as a gold precursor, ascorbic acid as a reductant, and bovine serum albumin (BSA) as a ligand.
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