One-step fabrication of hollow-channel gold nanoflowers with excellent catalytic performance and large single-particle SERS activity.
One-step fabrication of hollow-channel gold nanoflowers with excellent catalytic performance and large single-particle SERS activity.
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DOI：
10.1039/c6nr04045d
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发表时间：
2016-08
期刊：
影响因子：
6.7
通讯作者：
Sunjie Ye;F. Benz;M. Wheeler;Joseph Oram;J. Baumberg;O. Cespedes;H. Christenson;P. Coletta;L. Jeuken;Alexander F. Markham;K. Critchley;S. Evans
中科院分区：
文献类型：
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作者：
Sunjie Ye;F. Benz;M. Wheeler;Joseph Oram;J. Baumberg;O. Cespedes;H. Christenson;P. Coletta;L. Jeuken;Alexander F. Markham;K. Critchley;S. Evans
中空金属纳米结构由于其表面积大、净密度低和独特的光学特性，在催化、药物输送和光疗等各种应用中显示出潜力。在这项研究中，首次使用可自动降解的纳米纤维作为双功能模板，通过简单的一步合成，制造了由中心开放的中空通道和外表面上的多个分支/尖端组成的新型空心金纳米花（HAuNF）。一维 (1D) 纳米纤维既充当螺纹模板，又充当金晶体各向异性生长的促进剂，两者的结合导致形成具有中空通道和纳米尖峰的 HAuNF。有利的结构/表面特征（包括锋利的边缘、开放的空腔和高折射率面）的协同作用，为我们的HAuNF提供了优异的催化性能（活性和循环稳定性）以及大的单颗粒SERS活性（包括乙醇电氧化活性的约30倍和单颗粒SERS强度的约40倍，与具有光滑表面的类似尺寸的固体金纳米球相比，以及在500次循环后保留了86.7％的初始催化活性。乙醇电氧化）。这种创新的合成提供了与模板不同的几何形状的纳米结构，并且可以扩展到制造其他系统，例如空心通道银纳米花（HAgNF）。因此，它提供了通过模板方法设计中空纳米结构的见解，并为适合广泛应用的各种金属纳米材料提供了通用的合成策略。
Hollow metallic nanostructures have shown potential in various applications including catalysis, drug delivery and phototherapy, owing to their large surface areas, reduced net density, and unique optical properties. In this study, novel hollow gold nanoflowers (HAuNFs) consisting of an open hollow channel in the center and multiple branches/tips on the outer surface are fabricated for the first time, via a facile one-step synthesis using an auto-degradable nanofiber as a bifunctional template. The one-dimensional (1D) nanofiber acts as both a threading template as well as a promoter of the anisotropic growth of the gold crystal, the combination of which leads to the formation of HAuNFs with a hollow channel and nanospikes. The synergy of favorable structural/surface features, including sharp edges, open cavity and high-index facets, provides our HAuNFs with excellent catalytic performance (activity and cycling stability) coupled with large single-particle SERS activity (including ∼30 times of activity in ethanol electro-oxidation and ∼40 times of single-particle SERS intensity, benchmarked against similar-sized solid gold nanospheres with smooth surfaces, as well as retaining 86.7% of the initial catalytic activity after 500 cycles in ethanol electro-oxidation). This innovative synthesis gives a nanostructure of the geometry distinct from the template and is extendable to fabricating other systems for example, hollow-channel silver nanoflowers (HAgNFs). It thus provides an insight into the design of hollow nanostructures via template methods, and offers a versatile synthetic strategy for diverse metal nanomaterials suited for a broad range of applications.