Synthesis, characterization and electrocatalytic activity of fused gold nanoparticles.
Synthesis, characterization and electrocatalytic activity of fused gold nanoparticles.
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熔融金纳米粒子的合成、表征及电催化活性。
DOI：
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发表时间：
2011
影响因子：
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通讯作者：
S. A. John
中科院分区：
文献类型：
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作者：
P. Kannan;S. A. John
本文介绍了熔融球形金纳米粒子（AuNPs）的合成及其对羟胺（HA）氧化的电催化活性。以2-巯基-4-甲基-5-噻唑乙酸（TAA）为稳定剂，硼氢化钠（NaBH 4）为还原剂，采用一锅法合成了金纳米粒子。HR-TEM图像显示两个单独的AuNP在其表面上通过尺寸范围约为7 nm和长度约为15 nm直径的孔连接。pH研究表明，合成的融合AuNP在pH > 8时稳定。这表明存在于TAA分子上的羧酸根离子稳定了AuNP免于聚集。将其固定在3-巯丙基三甲氧基硅烷（MPTS）溶胶-凝胶膜修饰的Au电极上，并将其用于羟胺（HA）的电催化氧化。在0.2 M磷酸盐缓冲溶液（pH7.2）中，纳米金修饰电极对HA的氧化表现出良好的电催化活性，其氧化电位降低了100 mV，氧化电流比裸Au电极提高了3倍以上.此外，发现融合的AuNPs修饰电极比球形AuNPs修饰电极对HA显示出更大的电催化活性。
This paper describes the synthesis of fused spherical gold nanoparticles (AuNPs) and their electrocatalytic activity towards the oxidation of hydroxylamine (HA). Fused AuNPs were prepared by one-pot synthesis using 2-mercapto-4-methyl-5-thiazoleacetic acid (TAA) as a stabilizing agent and sodium borohydride (NaBH4) as a reducing agent. The HR-TEM images showed that two individual AuNP were joined via on its surface with a size range of approximately 7 nm and a length of approximately 15 nm diameter. The pH studies showed that the synthesized fused AuNPs was stable at pH > 8. This indicated that the carboxylate ion present on the TAA molecule stabilized the AuNPs from aggregation. Further, the fused AuNPs were utilized for the electrocatalytic oxidation of hydroxylamine (HA) after immobilized them on (3-mercaptopropyl)-trimethoxysilane (MPTS) sol-gel film modified Au electrode. The AuNPs modified electrode showed an excellent electrocatalytic activity towards the oxidation of HA in 0.2 M phosphate buffer solution (pH 7.2) by shifting its oxidation potential to 100 mV less positive and enhancing its oxidation current for more than three times when compared to bare Au electrode. Further, it was found that the fused AuNPs modified electrode showed greater electrocatalytic activity towards HA than the spherical AuNPs modified electrodes.