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Fabrication of Ag nanodot array over large area for surface-enhanced Raman scattering using hybrid nanoimprint mold made from AAO template

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Abstract

We demonstrated the fabrication of dense hexagonal arrays of Ag nanodots over a large area using a novel nanoimprint-based fabrication technique for surface-enhanced Raman spectroscopy. Flexible imprint molds with sub-10 nm features were duplicated from AAO templates using a novel hybrid mold technique. This method solves the nonflatness-induced defect issue in the conventional thermal nanoimprint technique, and allows high-quality duplications of nanometer features from rigid nonflat templates. Moreover, with the help of the excellent tunability of the size of nanoholes on AAO templates, we were able to tune the size of Ag nanodots, and consequently to tailor the resonance frequency of the Ag nanodot arrays. Finally, surface-enhanced Raman scattering of Rhodamine-123 on Ag nanodot arrays was measured, and large signal enhancement was observed on the 70 nm Ag nanodots. We numerically simulated the optical properties of those Ag nanodot arrays, and excellent agreement was found with the experimental results.

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Acknowledgments

This work was jointly supported by the National Natural Science Foundation of China (Grant No. 91023014, Grant No. 11374152), the National Basic Research Program of China (973 Program) (Grant No. 2013cb632702), the Priority Academic Program Development of Jiangsu Higher Education Institutions and RFDP, and the New Century Excellent Talent Project of the Ministry of Education of China (Grant No. NCET-10-0455).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, Jiangsu, China

    Tao Yang, Xinxin Fu, Qian Zhang, Yushuang Cui, Changsheng Yuan, Haixiong Ge & Yanfeng Chen

  2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, Jiangsu, China

    Tao Yang, Xinxin Fu, Qian Zhang, Yushuang Cui, Changsheng Yuan, Weihua Zhang, Haixiong Ge & Yanfeng Chen

  3. Department of Quantum Electronics and Optical Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, Jiangsu, China

    Weihua Zhang

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  1. Tao Yang
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  2. Xinxin Fu
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  3. Qian Zhang
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  4. Yushuang Cui
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  5. Changsheng Yuan
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  7. Haixiong Ge
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  8. Yanfeng Chen
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Correspondence to Changsheng Yuan or Weihua Zhang.

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Yang, T., Fu, X., Zhang, Q. et al. Fabrication of Ag nanodot array over large area for surface-enhanced Raman scattering using hybrid nanoimprint mold made from AAO template. Appl. Phys. A 117, 909–915 (2014). https://doi.org/10.1007/s00339-014-8454-8

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