金纳米花结构的制备及其催化性能研究  

Preparation and Catalytic Properties of Gold Nanoflowers

作　　者：王灵娟 欧全宏[1] 严昊 汤俊琪 WANG Ling-juan;OU Quan-hong;YAN Hao;TANG Jun-qi(College of Physics and Electronic Information,Yunnan Normal University,Kunming 650500,China)

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650500

出　　处：《光谱学与光谱分析》2023年第12期3747-3752,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61665014,62165018)资助。

摘　　要：金纳米花结构具有多分枝的形貌、很高的表面积-体积比,增强的电磁场效应而越来越受到人们的重视。采用抗坏血酸溶解左旋多巴的混合溶液还原氯金酸制备了金纳米花结构,分别利用紫外可见光谱仪(UV-Vis)、 X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对金纳米花结构的形貌和结构进行表征分析。结果表明,所制备的金纳米花结构具有较宽的表面等离子体共振吸收峰,该吸收峰位于650 nm左右。基于XRD结果分析可知该金纳米花结构为结晶性较好的面心立方结构。通过SEM分析可看到该金纳米花结构的形貌为表面具有很多尖锐的纳米片状的金纳米花结构且大小为(1.10±0.14)μm。在TEM图片中可清晰地观察到金纳米花结构表面纳米片的大小和详细形貌。总之,这些表征分析综合证明了所制备的金纳米花的独特形貌特征。此外,利用金纳米花结构作为纳米催化剂,在过量硼氢化钠下催化还原对硝基苯酚(4-NP)为对氨基苯酚(4-AP),该催化反应在数分钟即可完成。在分别加入10、 20和100μL的金纳米花结构为催化剂后,以紫外可见光谱仪测定不同时刻的光谱,计算该拟一级反应的速率常数分别达到了3.53×10^(-3)、 5.27×10^(-3)和5.4×10^(-3)s^(-1),表明所制备的金纳米花结构具有优良的催化活性。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 3X 10^(-3),5.27 X10^(-3),5.4 X 10^(-3) s^(-1) with 10,20 and 100μL of gold nanoflowers(AuNFs),respectively,which suggested the excellent catalytic properties of gold nanoflowers(AuNFs).

关 键 词：金纳米花结构 抗坏血酸 左旋多巴 催化 

分 类 号：O643.3[理学—物理化学]