Preparation and investigation of high-performance 3D Ag/SiO2 nanohole array substrate based on cicada wing
Preparation and investigation of high-performance 3D Ag/SiO2 nanohole array substrate based on cicada wing
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DOI：
10.1016/j.optmat.2022.113412
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发表时间：
2023-02
影响因子：
3.9
通讯作者：
Junfei Zang;Mu-lan Li;Q. Luo;Yonglong Jin;Lei Zhang;Jie Tang;Jinyi Shen;Tian Xu;Meifeng Xu;Jinghuai Fang;Chaonan Wang
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文献类型：
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作者：
Junfei Zang;Mu-lan Li;Q. Luo;Yonglong Jin;Lei Zhang;Jie Tang;Jinyi Shen;Tian Xu;Meifeng Xu;Jinghuai Fang;Chaonan Wang
本文利用正硅酸乙酯（TEOS）水解法制备了具有三维有序纳米孔结构的SiO2载体。然后通过在SiO2载体上热沉积Ag，得到了具有高热点密度的3D Ag/SiO2衬底。SEM和AFM观察表明，SiO2孔壁被大颗粒的Ag颗粒致密覆盖，其表面由大量细小的Ag纳米颗粒组成。特别是在孔壁的顶部，六个相邻的大Ag颗粒围绕每个孔。FDTD模拟结果表明，微小的银纳米颗粒之间的间隙和大的银颗粒之间的间隙都是有效的热点，可以有效地集中电场。以结晶紫（CV）为探针分子，该Ag/SiO2基底可以很容易地检测到10− 9 M CV，由于热点和3D结构的综合作用，计算出的增强因子（EF）为1.7 × 107。六边形排列的纳米孔结构赋予了所提出的Ag/SiO2基底良好的均匀性，相对标准偏差（RSD）估计为低至5.79%。该底物在实际应用中的巨大潜力被证明是通过成功检测三环唑低至0.01 ppm，不辜负欧盟标准。
In this paper, SiO2support with 3D ordered nanohole structure was developed by using the nanopillars naturally created on the surface of the cicada wing as the template through a simple strategy of tetraethyl orthosilicate (TEOS) hydrolysis. Then 3D Ag/SiO2substrate with a high density of hot spots was subsequently obtained by thermal deposition of Ag onto the SiO2support. SEM and AFM observation reveal the hole walls of SiO2were covered densely with large Ag particles whose surface was composed of lots of tiny Ag NPs. Especially at the top of the hole walls, six adjacent large Ag particles surrounded each hole. FDTD simulation demonstrated both the gaps between the tiny Ag NPs and those between large Ag particles were efficient hot spots, which could concentrate the electric field effectively. By using crystal violet (CV) as the probe molecule, the proposed Ag/SiO2substrate could detect 10−9M CV easily and the enhancement factor (EF) was calculated to be 1.7 × 107due to the combined effect of hot spots and the 3D structure. The hexagonally arrayed nanohole structure endowed the proposed Ag/SiO2substrate with good uniformity and the relative standard deviation (RSD) was estimated to be as low as 5.79%. The great potential of this substrate in practical applications was demonstrated by the successful detection of tricyclazole down to 0.01 ppm which lived up to the EU standard.