Optical VOCs detection using poly(3-alkylthiophenes) with different side-chain lengths |
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Authors: | VC DT |
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Affiliation: | aInstituto de Física de São Carlos (IFSC), Universidade de São Paulo (USP), Av. Trabalhador São Carlense, 400 CP 369, 13560-970 São Carlos, SP, Brazil |
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Abstract: | The use of conjugated polymers in the gas and volatile organic compounds (VOCs) detections represents an advance in the development of the electronic noses. Polythiophenes show good thermal and environmental stability, are easily synthesized and they have been studied as gas and VOCs sensors using different principles or transduction techniques. Among these techniques, optical sensing has been attracted attention, mainly due to its versatility. However, conjugated polymer-based optical sensors are still less studied. This paper describes the use of two poly(3-alkylthiophenes) for VOCs optical detection. The sensing measurements were carried out using visible spectroscopy. Both polymers showed good sensitivity to the VOCs, showing fast and reversible responses with some hysteresis, and were unable to detect hydroxylated samples. Furthermore, it was demonstrated that the thickness of polymer films influences the intensity of the optical response. Although there is similarity in the superficial composition of the polymers films, demonstrated by their surface energies, they showed significant differences in their optical properties upon exposure to the VOCs. |
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Keywords: | Optical sensor VOCs sensors Poly(3-alkythiophenes) Conjugated polymers |
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