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Sensors 2013, 13(11), 14676-14686; doi:10.3390/s131114676
Article

Localized Surface Plasmon Resonance with Five-Branched Gold Nanostars in a Plastic Optical Fiber for Bio-Chemical Sensor Implementation

1,* , 2
, 2
, 3
, 2
, 2
 and 1,4
1 Department of Industrial and Information Engineering, Second University of Naples, via Roma 29, 81031 Aversa, Italy 2 Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy 3 Department of Physics, University of Pavia, Via Bassi 6, 27100 Pavia, Italy 4 CNR-IREA via Diocleziano 328, 80124 Naples, Italy
* Author to whom correspondence should be addressed.
Received: 9 September 2013 / Revised: 27 September 2013 / Accepted: 25 October 2013 / Published: 29 October 2013
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper a refractive index sensor based on localized surface plasmon resonance (LSPR) in a Plastic Optical Fiber (POF), is presented and experimentally tested. LSPR is achieved exploiting five-branched gold nanostars (GNS) obtained using Triton X-100 in a seed-growth synthesis. They have the uncommon feature of three localized surface plasmon resonances. The strongest LSPRs fall in two ranges, one in the 600–900 nm range (LSPR 2) and the other one in the 1,100–1,600 nm range (LSPR 3), both sensible to refractive index changes. Anyway, due to the extremely strong attenuation (>102 dB/m) of the employed POF in the 1,100–1,600 nm range, only LSPR 2 will be exploited for refractive index change measurements, useful for bio-chemical sensing applications, as a proof of principle of the possibility of realizing a compact, low cost and easy-to-use GNS based device.
Keywords: localized surface plasmon resonance; plastic optical fiber; gold nanostars; chemical sensors localized surface plasmon resonance; plastic optical fiber; gold nanostars; chemical sensors
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.

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MDPI and ACS Style

Cennamo, N.; D'Agostino, G.; Donà, A.; Dacarro, G.; Pallavicini, P.; Pesavento, M.; Zeni, L. Localized Surface Plasmon Resonance with Five-Branched Gold Nanostars in a Plastic Optical Fiber for Bio-Chemical Sensor Implementation. Sensors 2013, 13, 14676-14686.

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