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Polymers 2017, 9(3), 93; doi:10.3390/polym9030093

Au Nanoparticles Immobilized on Honeycomb-Like Polymeric Films for Surface-Enhanced Raman Scattering (SERS) Detection

1
Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
2
Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
3
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
*
Authors to whom correspondence should be addressed.
Academic Editor: Po-Chih Yang
Received: 24 January 2017 / Revised: 28 February 2017 / Accepted: 2 March 2017 / Published: 6 March 2017
(This article belongs to the Special Issue Polymers for Chemosensing)
View Full-Text   |   Download PDF [6957 KB, uploaded 6 March 2017]   |  

Abstract

We have successfully developed novel surface-enhanced Raman scattering (SERS) substrates with three-dimensional (3D) porous structures for effectively improving the sensitivity and reproducibility of SERS, which can rapidly detect small molecules (rhodamine 6G as an example). Periodical arrays of the honeycomb-like substrates were fabricated by self-assembling polyurethane-co-azetidine-2,4-dione (PU-PAZ) polymers. PU-PAZ comprising amphiphilic dendrons could stabilize the phase separation between the water droplets and polymer solution, and then organize into regular porous structures during the breath figure method. Subsequently, SERS substrates were fabricated by immobilizing gold nanoparticles (AuNPs) onto the honeycomb-like films with various 3D porous structures, controlled by the different PU-PAZ concentrations and relative humidities. Results show that surface enhancement factors of honeycomb-like substrates were 20 times higher than that of flat-film substrates (control group) due to enormous hot-spots resonance effects by the 3D porous structure, verified through Raman mapping at various positions of the z-axis. Furthermore, the particle size effects were evaluated by immobilized 12 and 67 nm of AuNPs on the honeycomb-like substrates, indicating larger AuNPs could induce more pronounced hot-spots effects. The generation of hot-spots resonance to enhance Raman intensity is strongly dependent on the diameter of AuNPs and the pore size of the honeycomb-like and 3D porous substrates for label-free and rapid SERS detection. View Full-Text
Keywords: surface-enhanced Raman scattering (SERS); breath figure; honeycomb-like polymeric films; gold nanoparticles; hot-spots resonance effects surface-enhanced Raman scattering (SERS); breath figure; honeycomb-like polymeric films; gold nanoparticles; hot-spots resonance effects
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MDPI and ACS Style

Chiang, C.-Y.; Liu, T.-Y.; Su, Y.-A.; Wu, C.-H.; Cheng, Y.-W.; Cheng, H.-W.; Jeng, R.-J. Au Nanoparticles Immobilized on Honeycomb-Like Polymeric Films for Surface-Enhanced Raman Scattering (SERS) Detection. Polymers 2017, 9, 93.

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