Simultaneous growth of spherical, bipyramidal and wire-like gold nanostructures in solid and solution phases: SERS and electrocatalytic applications,CrystEngComm

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Simultaneous growth of spherical, bipyramidal and wire-like gold nanostructures in solid and solution phases: SERS and electrocatalytic applications
CrystEngComm ( IF 2.6 ) Pub Date : 2017-08-16 00:00:00 , DOI: 10.1039/c7ce01044c
N. S. K. Gowthaman _{1,

2,

3,

4,

5} , S. Abraham John _{1,

2,

3,

4,

5}

Affiliation

Anisotropic growth of gold nanostructures (AuNS) on an indium tin oxide (ITO) substrate and in growth solution was achieved by in situ electrochemical reduction of Au⁺ ions from the growth solution. Initially, the growth solution was prepared by adding the shape-directing agent Cu²⁺ into a solution of cetyltrimethylammonium bromide (CTAB), HAuCl₄ and ascorbic acid (AA). The Au⁺–CTAB complex from the solution was electrochemically reduced to deposit AuNPs on ITO, which act as nucleation centers. The HR-TEM and SEM images exhibit spherical, bipyramidal and wire-like AuNS grown both in solution and on ITO after 1, 3 and 6 h, respectively. The crystallite size and lattice strain were calculated and it was found that the lattice strain decreases with an increase in nucleation time. The ITO/Au-nanowires showed a higher surface coverage (10.1%) and electrochemically active surface area (0.69 cm²) than the other AuNS. Further, the ITO/AuNS exhibited shape-dependent surface enhanced Raman scattering enhancement (SERS) towards 4-aminothiophenol adsorbed on the grown AuNS surface. The ITO/Au-nanowires showed a higher enhancement factor of 9.7 × 10⁵ when compared to the other AuNS. Further, the electrocatalytic activity of the different shaped AuNS was examined towards the reduction of hydrogen peroxide (HP). The Au-nanowire modified ITO electrode exhibited higher electrocatalytic activity towards HP reduction by not only shifting its reduction potential towards less positive potential but also by enhancing its reduction current.

中文翻译：

固相和溶液相同时生长球形，双锥体和线状金纳米结构：SERS和电催化应用

通过在原位电化学还原生长溶液中的Au ⁺离子，可以在铟锡氧化物（ITO）衬底上和生长溶液中各向异性生长金纳米结构（AuNS）。最初，通过将形状导向剂Cu ^2+添加到十六烷基三甲基溴化铵（CTAB），HAuCl ₄和抗坏血酸（AA）的溶液中来制备生长溶液。金⁺将溶液中的–CTAB络合物进行电化学还原，以在ITO上沉积AuNP，它们是成核中心。HR-TEM和SEM图像分别显示在1、3和6小时后在溶液中和在ITO上均生长的球形，双锥体和线状AuNS。计算出微晶尺寸和晶格应变，发现晶格应变随着成核时间的增加而减小。ITO / Au纳米线的表面覆盖率（10.1％）和电化学活性表面积（0.69 cm ²）比其他AuNS高。此外，ITO / AuNS对吸附在生长的AuNS表面上的4-氨基硫酚表现出形状依赖性的表面增强拉曼散射增强（SERS）。ITO / Au纳米线的增强因子更高，为9.7×10 ⁵与其他AuNS相比。此外，检查了不同形状的AuNS对减少过氧化氢（HP）的电催化活性。金纳米线修饰的ITO电极不仅通过将其还原电势向较小的正电势移动，而且还通过增强其还原电流，从而表现出较高的对HP还原的电催化活性。

更新日期：2017-09-18

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