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| Preparation and Catalytic Properties of Gold Nanoflowers |
| WANG Ling-juan, OU Quan-hong, YAN Hao, TANG Jun-qi* |
College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
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Abstract Gold nanoflowers (AuNFs) have attracted great attention due to abundant multi-branched tips, high surface area to volume ratio and enhanced electromagnetic field effect. In this study, the gold nanoflowers were synthesised at room temperature by reducing chloroauric acid (HAuCl4) using a certain amount of levodopa dissolved in ascorbic acid solution. The morphology and structure of the synthesized gold nanoflowers (AuNFs) were studied using ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. There was a broad localized surface plasmon resonance (LSPR) absorption peak forgold nanoflowers, and the peak was located at about 650 nm from UV-Vis spectr alanalysis.XRD results of the prepared gold nanoflowers displayed gold's face-center cubic (fcc) structure. SEM examined the morphology and size of AuNFs. There were muchspiculate nanoplate-like structureson the surface of AuNFs with a size of (1.10±0.14) μm. It could be clearerto observe the size and shape in TEM images.These results consistently confirmed the successful synthesis of AuNFs. In addition, the unique structural features of the gold nanoflowers (AuNFs) inspired us to use them as high-performance nanocatalysts. The catalytic activity of gold nanoflowers (AuNFs) was studied by the catalytic reduction of p-nitrophenol (also known as 4-nitrophenol, abbreviated as 4-NP or p-NP) to p-aminophenol (abbreviated as p-AP or 4-AP) in the presence of excess sodium borohydride. The apparent rate constants of this pseudo-first-order kinetic reaction were 3×10-3, 5.27×10-3, 5.4×10-3 s-1 with 10, 20 and 100 μL of gold nanoflowers (AuNFs), respectively, which suggested the excellent catalytic properties of gold nanoflowers (AuNFs).
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Received: 2022-04-24
Accepted: 2022-10-23
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Corresponding Authors:
TANG Jun-qi
E-mail: tangjunqi1984@163.com
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