Collapse-Induced Multimer Formation of Self-Assembled Nanoparticles for Surface Enhanced Raman Scattering

Coatings

JunHyun Park¹  SeungWon Seon¹  SeGi Lee¹  JunPyo Hwang¹  YoungChun Ko¹  MinKyu Jung¹  SuEon Lee¹  SeungHee Kim¹  BongHoon Kim¹  Shin Park¹  TaeSang Yu¹  YoungTaek Oh¹  JuYoung Kim² 

[1] Department of Organic Materials and Fiber Engineering, Soongsil University 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Korea;Reality Devices Research Division, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Korea;

关键词: self-assembly;    block copolymer;    chemically modified graphene;    surface enhanced Raman scattering;    localized surface plasmon resonance;   

DOI  :  10.3390/coatings11010076

来源: DOAJ

【 摘 要 】

Metallic nanoparticle ensemble, with narrow inter-particle distance, is a useful element for diverse optical devices due to highly enhanced electric field intensity at the gap. Self-assembly of block copolymer (BCP) can provide the versatile solution to fabricate precise nanostructures, but this methodology has the intrinsic limitation to realize optically coupled metallic multimer geometry with narrow inter-particle distance. This is because BCP-based nanotemplate possesses a minimum size limit for interparticle distance imposed by its thermodynamic restriction. Herein, we investigate the facile formation of metallic multimer with scalability and area-selectivity through the collapse of self-assembled BCP nanopattern. The capillary-force-induced collapse phenomenon enables a spatial transformation of lateral regular ordering in metallic nanoparticle array and enhances electric field intensity. The fabrication of this metallic nanoparticle ensemble from BCP lithography is successfully utilized for surface enhanced Raman scattering (SERS). The enhancement factor of metal nanoparticle multimer is calculated as ~6.74 × 10⁵ at 1000 cm⁻¹, 2.04 × 10⁶ at 1022 cm⁻¹, and 6.11 × 10⁶ at 1580 cm⁻¹, respectively.

【 授权许可】

Unknown