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Open AccessArticle

Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

1
Graduate Institute of Electro-Optical and Materials Science, National Formosa University, Yunlin 63208, Taiwan
2
Department of Biotechnology, National Formosa University, Yunlin 63208, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Chien-Hung Liu and Samuel B. Adeloju
Appl. Sci. 2016, 6(3), 67; https://doi.org/10.3390/app6030067
Received: 31 December 2015 / Revised: 28 January 2016 / Accepted: 2 February 2016 / Published: 26 February 2016
(This article belongs to the Special Issue Selected Papers from the 2015 International Conference on Inventions)
Polystyrene (PS) opal and titania (TiO2) inverse opal films were fabricated by the self-assembly colloidal crystal template technique. Based on Bragg’s law, these sensors were used to detect the different concentrations of ethanol solution. The results indicated that TiO2 inverse opal films were advantageous over PS opal film for detecting the ethanol concentration. TiO2 inverse opal films sintered at 600 °C retained the highest sensitivity for ethanol concentration identification, since the anatase phase was transformed into the rutile phase, which resulted in an enhancement of the refractive index, i.e., an increase in the amount of the red shift. View Full-Text
Keywords: photonic crystals; inverse opal; polystyrene; titania; alcohol concentration photonic crystals; inverse opal; polystyrene; titania; alcohol concentration
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MDPI and ACS Style

Kuo, W.-K.; Weng, H.-P.; Hsu, J.-J.; Yu, H.H. Photonic Crystal-Based Sensors for Detecting Alcohol Concentration. Appl. Sci. 2016, 6, 67.

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