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Fabrication, Characterization, and Application of Large-Scale Uniformly Hybrid Nanoparticle-Enhanced Raman Spectroscopy Substrates

文献类型： 外文期刊

作者： Qi, Qi 1 ; Liu, Chunhui 1 ; Liu, Lintao 1 ; Meng, Qingyi 1 ; Wei, Shuhua 1 ; Ming, Anjie 2 ; Zhang, Jing 1 ; Wang, Yanron 1 ;

作者机构： 1.North China Univ Technol, Sch Informat Sci & Technol, 5 Jinyuanzhuang St, Beijing 100144, Peoples R China

2.Gen Res Inst Nonferrous Met, State Key Lab Adv Mat Smart Sensing, 11 Xingkedong St, Beijing 101402, Peoples R China

3.Chinese Acad Sci, Inst Microelect, Smart Sensing R&D Ctr, 3 Western Beitucheng St, Beijing 100029, Peoples R China

4.Chinese Acad Fishery Sci, Minist Agr, 150 Qingta St, Beijing 100141, Peoples R China

5.MIT, Dept Chem, Cambridge, MA 02139 USA

关键词： SERS; Au nanoparticles; reproducibility; sensitivity; malachite green

期刊名称：MICROMACHINES （ 影响因子：2.891； 五年影响因子：2.943 ）

ISSN： 2072-666X

年卷期： 2019 年 10 卷 5 期

页码：

收录情况： SCI

摘要： Surface-enhanced Raman spectroscopy (SERS) substrates with high sensitivity and reproducibility are highly desirable for high precision and even molecular-level detection applications. Here, large-scale uniformly hybrid nanoparticle-enhanced Raman spectroscopy (NERS) substrates with high reproducibility and controllability were developed. Using oxygen plasma treatment, large-area and uniformly rough polystyrene sphere (URPS) arrays in conjunction with 20 nm Au films (AuURPS) were fabricated for SERS substrates. Au nanoparticles and clusters covered the surface of the URPS arrays, and this increased the Raman signal. In the detection of malachite green (MG), the fabricated NERS substrates have high reproducibility and sensitivity. The enhancement factor (EF) of Au nanoparticles and clusters was simulated by finite-difference time-domain (FDTD) simulations and the EF was more than 10(4). The measured EF of our developed substrate was more than 10(8) with a relative standard deviation as low as 6.64%-13.84% over 15 points on the substrate. The minimum limit for the MG molecules reached 50 ng/mL. Moreover, the Raman signal had a good linear relationship with the logarithmic concentration of MG, as it ranged from 50 ng/mL to 5 g/mL. The NERS substrates proposed in this work may serve as a promising detection scheme in chemical and biological fields.

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