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Construction of Ag/Au bimetallic alloying nanoparticles on GaN films for high-performance SERS substrate, and modification of defect states

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Abstract

Most frequently, pure Ag or Au nanoparticles were used to decorate on GaN-based substrates; however, studies of Ag-Au bimetallic nanoparticles with exceptional optical and plasmonic capabilities are rare. In this study, we present a novel method for creating hybrid Ag-Au NPs/GaN materials, which were discovered to be highly suppressive in the broadband defect emission candidate and high-performance surface-enhanced Raman scattering (SERS) substrates. When the annealing temperature increased from 450 to 650 °C, the average size of Ag nanoparticles reduced from 300 to 50 nm, respectively. Subsequently, enhancing the Raman intensity due to increasing hot spots. The as-fabricated SERS substrate shows a high sensitivity with a wide detection range of 1.0 × 10− 6 – 1.0 × 10− 12 mol L− 1. Furthermore, using the resonance effect between the surface plasmon of Ag-Au NPs and defect emission, the defects states can be suppressed and converted to beneficial excitonic emission. These findings show that Ag-Au bimetallic are a promising candidate for improving optical and trace analyses detection.

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Acknowledgements

This research was supported by the Physics development program grant funded by Vietnam Academy of Science and Technology (VAST) (KHCBVL.06/24–25). EKK acknowledges the financial support by the Korea Evaluation Institute of Industrial Technology (KEIT) grant funded by the Korean government (MOTIE) (No.RS-2022-00143570).

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Authors and Affiliations

  1. Institute of Physics, Vietnam Academy of Science and Technology, No. 10 Dao Tan, Ba Dinh, Ha Noi, Vietnam

    Thi Kim Oanh Vu, Nguyen Thi Thanh Bao, Bui Thi Thu Phuong, Nguyen Ngoc Anh & Nguyen Thi Minh Hien

  2. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ha Noi, Vietnam

    Thi Kim Oanh Vu

  3. Hanoi University of Science, Vietnam National University, Ha Noi, Vietnam

    Hoang Van Thanh

  4. Department of Physics and Research Institute for Natural Sciences, Hanyang University, Seoul, 04763, Republic of Korea

    Eun Kyu Kim

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Contributions

In this article, the author’s contribution are as follow: Thi Kim Oanh Vu: Study conception and design, data collection, and manuscript preparation Nguyen Thi Thanh Bao: Data collection and analysis and interpretation of results Bui Thi Thu Phuong: Data collection and analysis and interpretation of results Hoang Van Thanh: Data collection and analysis and interpretation of results Nguyen Ngoc Anh: Study conception and design and data collection Nguyen Thi Minh Hien: Data collection and analysis and interpretation of results Eun Kyu Kim: Study conception and design, and manuscript preparation.

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Correspondence to Thi Kim Oanh Vu or Eun Kyu Kim.

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Vu, T.K.O., Bao, N.T.T., Phuong, B.T.T. et al. Construction of Ag/Au bimetallic alloying nanoparticles on GaN films for high-performance SERS substrate, and modification of defect states. Appl. Phys. A 130, 353 (2024). https://doi.org/10.1007/s00339-024-07539-y

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