Method and device for sensing humidity with reversible molecular dimerization
The present invention relates to the use of reversible dimerization of methylene blue (MB) for sensing humidity. The invention preferably uses titanate nanowires coated with MB. The self-organizational properties of MB on the surface of this nanostructured material studied by spectroscopic means revealed that the light absorption properties of the MB molecules are humidity dependent. Based on the observed humidity dependent metachromasy, we fabricated a humidity sensor using optical fiber technology which is adapted for medical, industrial or environmental applications. The sensor operates with excellent linearity over the relative humidity (RH) levels ranging from 8 to 98%. The response and recovery time can be reduced to 0.5 s while the device exhibits excellent reproducibility with low hysteresis. These performances allow the implementation of the sensor in a breathing monitoring system. Furthermore, the metachromasy was observed for other dyes. This calls for a detailed study of molecular configuration on functional surfaces since it can substantially modify the sensitization efficacy of dyes, e.g. in light conversion.
48326365
Alternative title(s) : (de) Verfahren und vorrichtung zum nachweis von feuchtigkeit mit reversibler molekularer dimerisierung und verfahren zur herstellung der vorrichtung. (fr) Procédée et dispositif pour la détermination d'humidité avec dimérisation moléculaire réversible et procédée pour la préparation du dispositif. (en) Method and device for sensing humidity with reversible molecular dimerization and method for preparing the device
TTO:6.1172
Patent number | Country code | Kind code | Date issued |
EP2828654 | EP | B1 | 2017-12-06 |
US2015050743 | US | A1 | 2015-02-19 |
EP2828654 | EP | A1 | 2015-01-28 |
WO2013140378 | WO | A1 | 2013-09-26 |