19September2019

Nano-Micro Letters

Controllable Biosynthesis and Properties of Gold Nanoplates Using Yeast Extract

Zhi Yang1,*, Zhaohui Li1, Xuxing Lu2, Fengjiao He1, Xingzhong Zhu1, Yujie Ma1, Rong He1, Feng Gao1, Weihai Ni2,*, Yasha Yi3,*

Abstract
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Nano-Micro Lett. (2017) 9:5

First Online: 13 September 2016 (Article)

DOI:  10.1007/s40820-016-0102-8

 

Abstract

 


Figure discription XXX
Biosynthesis of gold nanostructures has drawn increasing concerns because of its green and sustainable synthetic process. However, biosynthesis of gold nanoplates is still a challenge because of the expensive source and difficulties of controllable formation of morphology and size. Herein, one-pot biosynthesis of gold nanoplates is proposed, in which cheap yeast was extracted as a green precursor. The morphologies and sizes of the gold nanostructures can be controlled via varying the pH value of the biomedium. In acid condition, gold nanoplates with side length from 1300 ± 200 to 300 ± 100 nm and height from 18 to 15 nm were obtained by increasing the pH value. Whereas, in neutral or basic condition, only gold nanoflowers and nanoparticles were obtained. It was determined that organic molecules, such as succinic acid, lactic acid, malic acid, and glutathione, which generated in metabolism process, played important role in the reduction of gold ions. Besides, it was found that the gold nanoplates exhibited plasmonic properties with prominent dipole infrared resonance in near-infrared region, indicating their potential in surface plasmon enhanced applications, such bioimaging and photothermal therapy.

 

Keywords

Yeast; Gold nanoplates; Biosynthesis; pH-dependent; Plasmonic property

 

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