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Sensors 2017, 17(7), 1519; doi:10.3390/s17071519

Nanoporous Gold Nanocomposites as a Versatile Platform for Plasmonic Engineering and Sensing

1
Department of Electrical and Computer Engineering, University of Houston, 4800 Calhoun Rd, Houston, TX 77004, USA
2
Department of Biomedical Engineering, University of Houston, 4800 Calhoun Rd, Houston, TX 77004, USA
3
Program of Materials Science and Engineering, University of Houston, 4800 Calhoun Rd, Houston, TX77004, USA
4
Department of Chemistry, University of Houston, 4800 Calhoun Rd, Houston, TX 77004, USA
5
Biomedical Institute for Global Health Research and Technology (BIGHEART), National University of Singapore 14 Medical Drive, Singapore 117599, Singapore
*
Author to whom correspondence should be addressed.
Received: 1 June 2017 / Revised: 23 June 2017 / Accepted: 24 June 2017 / Published: 28 June 2017
(This article belongs to the Special Issue Micro and Nanofabrication Technologies for Biosensors)
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Abstract

Plasmonic metal nanostructures have shown great potential in sensing applications. Among various materials and structures, monolithic nanoporous gold disks (NPGD) have several unique features such as three-dimensional (3D) porous network, large surface area, tunable plasmonic resonance, high-density hot-spots, and excellent architectural integrity and environmental stability. They exhibit a great potential in surface-enhanced spectroscopy, photothermal conversion, and plasmonic sensing. In this work, interactions between smaller colloidal gold nanoparticles (AuNP) and individual NPGDs are studied. Specifically, colloidal gold nanoparticles with different sizes are loaded onto NPGD substrates to form NPG hybrid nanocomposites with tunable plasmonic resonance peaks in the near-infrared spectral range. Newly formed plasmonic hot-spots due to the coupling between individual nanoparticles and NPG disk have been identified in the nanocomposites, which have been experimentally studied using extinction and surface-enhanced Raman scattering. Numerical modeling and simulations have been employed to further unravel various coupling scenarios between AuNP and NPGDs. View Full-Text
Keywords: nanoporous gold disk; nanoporous nanocomposite; surface-enhanced Raman scattering; plasmonic sensing nanoporous gold disk; nanoporous nanocomposite; surface-enhanced Raman scattering; plasmonic sensing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhao, F.; Zeng, J.; Shih, W.-C. Nanoporous Gold Nanocomposites as a Versatile Platform for Plasmonic Engineering and Sensing. Sensors 2017, 17, 1519.

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