纳米银的自动催化氧化及其在光谱分析中的应用。
Autocatalytic oxidization of nanosilver and its application to spectral analysis.
机构信息
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection of Ministry Education, Guangxi Normal University, Guilin 541004, China.
出版信息
Sci Rep. 2014 Feb 5;4:3990. doi: 10.1038/srep03990.
The stable yellow nanosilver (AgNP) and blue nanosilver (AgNPB) sols were prepared by the NaBH4 procedure. The new nanocatalytic reaction of AgNP-NaCl-H2O2 was investigated by surface plasmon resonance (SPR) absorption, resonance Rayleigh scattering (RRS), surface-enhanced Raman scattering (SERS) and scanning electron microscope (SEM) techniques. The autocatalytic oxidization of Ag on AgNP surface by H2O2 was observed firstly and the AgNP/AgCl nanoparticles were characterized. The [Ag(+)] from AgNP is different to the Ag(+) from AgNO3 that adsorb on the AgNP surface. An autocatalytic oxidization mechanism was proposed to explain experimental phenomena. The relationship between the SPR absorption peaks and the RRS peaks of AgNPB was studied, and three characteristic RRS peaks called as out-of-plane quadrupole, out-of-plane dipole and in-plane dipole RRS peaks were observed firstly. Using AgNP as nanoprobe, a simple, sensitive and selective RRS method was developed for assay of H2O2 in the range of 2.0 × 10(-8)-8.0 × 10(-5) mol/L.
稳定的黄色纳米银（AgNP）和蓝色纳米银（AgNPB）溶胶是通过 NaBH4 程序制备的。通过表面等离子体共振（SPR）吸收、共振瑞利散射（RRS）、表面增强拉曼散射（SERS）和扫描电子显微镜（SEM）技术研究了 AgNP-NaCl-H2O2 的新纳米催化反应。首次观察到 H2O2 对 AgNP 表面上 Ag 的自催化氧化，并对 AgNP/AgCl 纳米颗粒进行了表征。AgNP 表面上的 [Ag(+)]与吸附在 AgNP 表面上的 AgNO3 中的 Ag(+)不同。提出了一个自催化氧化机制来解释实验现象。研究了 AgNPB 的 SPR 吸收峰和 RRS 峰之间的关系，首次观察到三个特征 RRS 峰，称为面外四极、面外偶极和面内偶极 RRS 峰。使用 AgNP 作为纳米探针，建立了一种简单、灵敏和选择性的 RRS 方法，用于测定 2.0×10(-8)-8.0×10(-5)mol/L 范围内的 H2O2。
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