A facile route towards large area self-assembled nanoscale silver film morphologies and their applications towards metal enhanced fluorescence

SENSORS AND ACTUATORS B-CHEMICAL

卷:249

Article

Hohenberger, Erik¹  Freitag, Nathan¹  Rosenmann, Daniel²  Korampally, Venumadhav¹ 

[1] Northern Illinois Univ, Dept Elect Engn, 340 Engn Bldg, De Kalb, IL 60115 USA

[2] Argonne Natl Lab, Ctr Nanoscale Mat, 9700 S Cass Ave, Lemont, IL 60439 USA

关键词: Optical sensor;    Surface plasmon resonance;    Metal enhanced fluorescence;    Nanofabrication;    Self assembly;   

DOI  :  10.1016/j.snb.2017.04.012

来源: Elsevier

【 摘 要 】

We present a facile method for fabricating nanostructured silver films containing a high density of nanoscopic gap features through a surface directed phenomenon utilizing nanoporous scaffolds rather than through traditional lithographic patterning processes. This method enables tunability of the silver film growth by simply adjusting the formulation and processing conditions of the nanoporous film prior to metallization. We further demonstrate that this process can produce nanoscopic gaps in thick (100 nm) silver films supporting localized surface plasmon resonance with large field amplification within the gaps while enabling launching of propagating surface plasmons within the silver grains. These enhanced fields provide metal enhanced fluorescence with enhancement factors as high as 21 times compared to glass, as well as enable visualization of single fluorophore emission. This work provides a low-cost rapid approach for producing novel nanostructures capable of broadband fluorescence amplification, with potential applications including plasmonic and fluorescence based optical sensing and imaging applications. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free