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Sensors 2009, 9(1), 519-527; doi:10.3390/s90100519
Article

Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating

1,2,* , 3
, 1,2
, 2
, 2
, 3
 and 3
1 -Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal 2 INESC Porto, Rua Dr. Roberto Frias, 378, 4200-465 Porto, Portugal 3 Universidad Pública de Navarra, Campus Arrosadia, 31006 Pamplona, Spain
* Author to whom correspondence should be addressed.
Received: 29 October 2008 / Revised: 19 December 2008 / Accepted: 15 January 2009 / Published: 16 January 2009
(This article belongs to the Special Issue Nanotechnological Advances in Biosensors)
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Abstract

This work addresses a new configuration that improves the sensitivity of a humidity sensor based on a long-period fiber grating coated with a SiO2-nanospheres film. An intermediate higher refractive index overlay, deposited through Electrostatic Self-Assembly, is placed between the fiber cladding and the humidity sensitive film in order to increase the total effective refractive index of the coating. With this intermediate design, a three-fold improvement in the sensitivity was obtained. Wavelength shifts up to 15 nm against 5 nm were achieved in a humidity range from 20% to 80%.
Keywords: Humidity sensor; long-period fiber grating; nanospheres; electrostatic self-assembly Humidity sensor; long-period fiber grating; nanospheres; electrostatic self-assembly
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

Viegas, D.; Goicoechea, J.; Santos, J.L.; Araújo, F.M.; Ferreira, L.A.; Arregui, F.J.; Matias, I.R. Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating. Sensors 2009, 9, 519-527.

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