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학술지 Ultralarge Area Sub-10 nm Plasmonic Nanogap Array by Block Copolymer Self-Assembly for Reliable High-Sensitivity SERS
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저자
진형민, 김주영, 허민성, 정성준, 김봉훈, 차승근, 한규효, 김장환, 양건국, 신종화, 김상욱
발행일
201812
출처
ACS Applied Materials & Interfaces, v.10 no.51, pp.44660-44667
ISSN
1944-8244
출판사
American Chemical Society(ACS)
DOI
https://dx.doi.org/10.1021/acsami.8b17325
협약과제
17PB7100, 덴드라이트 억제를 위한 이온분포제어형 전해질 및 미세패턴 전극기술 기반 리튬금속 이차전지 기술 개발, 이영기
초록
Effective surface enhancement of Raman scattering (SERS) requires strong near-field enhancement as well as effective light collection of plasmonic structures. To this end, plasmonic nanoparticle (NP) arrays with narrow gaps or sharp tips have been suggested as desirable structures. We present a highly dense and uniform Au nanoscale gap array enabled by the customized design of NP shape and arrangement employing block copolymer self-assembly. Block copolymer self-assembly in thin films offers uniform hexagonally packed nanopost template arrays over the entire surface of a 2 in. wafer. Conventional evaporative metal deposition over the nanotemplate surface allows precise geometric control and positional arrangement of metal NPs, constituting tunable, strong plasmonic near-field enhancement particularly at the "hot spots" near interparticular nanoscale gaps. Underlying field distribution has been investigated by a finite-difference time-domain simulation. In the detection of thiophenol, our Au nanogap array shows a remarkable enhancement of Raman intensity greater than ~10 4 , a standard deviation as small as 12.3% compared to that of the planar Au thin film. In addition, adenine biomolecules can be detected with a detection limit as low as 100 nM. Our approach proposes highly sensitive and reliable SERS on the basis of a scalable, low-cost bottom-up strategy.
키워드
block copolymer, nanogap, plasmonic, sensor, SERS
KSP 제안 키워드
Au thin film, Block copolymer self-assembly, Bottom-up strategy, Customized design, Detection limit, Effective surface, Finite Difference Time Domain(FDTD), High Sensitivity, Highly sensitive, Hot spot, Light collection