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Synergistic SERS Enhancement in GaN-Ag Hybrid System toward Label-Free and Multiplexed Detection of Antibiotics in Aqueous Solutions

Cited 32 time in Web of Science Cited 34 time in Scopus

Lee, Kang Hyun; Jang, Hanhwi; Kim, Yoon Seok; Lee, Chul-Ho; Cho, Seunghee H.; Kim, Minjoon; Son, Hoki; Bae, Kang Bin; Dao, Dung Van; Jung, Yeon Sik; Lee, In-Hwan

Issue Date
Wiley-VCH Verlag
Advanced Science, Vol.8 No.19, p. 2100640
Noble metal-based surface-enhanced Raman spectroscopy (SERS) has enabled the simple and efficient detection of trace-amount molecules via significant electromagnetic enhancements at hot spots. However, the small Raman cross-section of various analytes forces the use of a Raman reporter for specific surface functionalization, which is time-consuming and limited to low-molecular-weight analytes. To tackle these issues, a hybrid SERS substrate utilizing Ag as plasmonic structures and GaN as charge transfer enhancement centers is presented. By the conformal printing of Ag nanowires onto GaN nanopillars, a highly sensitive SERS substrate with excellent uniformity can be fabricated. As a result, remarkable SERS performance with a substrate enhancement factor of 1.4 x 10(11) at 10 fM for rhodamine 6G molecules with minimal spot variations can be realized. Furthermore, quantification and multiplexing capabilities without surface treatments are demonstrated by detecting harmful antibiotics in aqueous solutions. This work paves the way for the development of a highly sensitive SERS substrate by constructing complex metal-semiconductor architectures.
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  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area 2차원 반도체 소자 및 재료, High-Performance 2D Electronics, Low-Power 2D Electronics, 뉴로모픽 소자 및 응용기술, 저전력 소자 및 소자물리


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