Programmable SERS active substrates for chemical and biosensing applications using amorphous/crystalline hybrid silicon nanomaterial.
Programmable SERS active substrates for chemical and biosensing applications using amorphous/crystalline hybrid silicon nanomaterial.
复制标题
使用无定形/晶体混合硅纳米材料的化学和生物传感应用的可编程SERS活性底物。
DOI：
10.1038/srep19663
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发表时间：
2016-01-20
影响因子：
4.6
通讯作者：
Tan B
中科院分区：
文献类型：
--
作者：
Powell JA;Venkatakrishnan K;Tan B
我们展示了一种独特的纳米结构非晶/晶体混合硅材料的创建，该材料表现出表面增强拉曼散射（SERS）活性。这种纳米材料是非晶/结晶纳米球体的互连网络，形成纳米网结构；据我们所知，这种材料以前没有被观察到，也没有被用作 SERS 传感材料。这种材料是使用飞秒合成技术形成的，该技术有利于激光羽流离子凝聚形成机制。通过微调激光羽流温度和羽流内的离子相互作用机制，我们能够精确编程纳米球体中结晶硅与非晶硅含量的相对比例，以及单个纳米球体的尺寸分布和拉曼热点纳米间隙的尺寸。通过使用罗丹明 6G (R6G) 和结晶紫 (CV) 化学染料，与块状硅晶片基板相比，我们能够观察到混合纳米材料的最大增强因子分别为 5.38 × 106 和 3.72 × 106。随着能够对分析物进行 SERS 检测的硅基纳米材料的诞生，这项工作展示了纳米结构硅在纳米拉曼传感应用中从非活性角色到 SERS 活性角色的重新定义。
We present the creation of a unique nanostructured amorphous/crystalline hybrid silicon material that exhibits surface enhanced Raman scattering (SERS) activity. This nanomaterial is an interconnected network of amorphous/crystalline nanospheroids which form a nanoweb structure; to our knowledge this material has not been previously observed nor has it been applied for use as a SERS sensing material. This material is formed using a femtosecond synthesis technique which facilitates a laser plume ion condensation formation mechanism. By fine-tuning the laser plume temperature and ion interaction mechanisms within the plume, we are able to precisely program the relative proportion of crystalline Si to amorphous Si content in the nanospheroids as well as the size distribution of individual nanospheroids and the size of Raman hotspot nanogaps. With the use of Rhodamine 6G (R6G) and Crystal Violet (CV) chemical dyes, we have been able to observe a maximum enhancement factor of 5.38 × 106 and 3.72 × 106 respectively, for the hybrid nanomaterial compared to a bulk Si wafer substrate. With the creation of a silicon-based nanomaterial capable of SERS detection of analytes, this work demonstrates a redefinition of the role of nanostructured Si from an inactive to SERS active role in nano-Raman sensing applications.