Dye metachromasy on titanate nanowires: sensing humidity with reversible molecular dimerization
Dye metachromasy on titanate nanowires: sensing humidity with reversible molecular dimerization
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DOI：
10.1039/c2jm16443d
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Magrez, Arnaud
中科院分区：
文献类型：
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作者：
Horvath, Endre;Ribic, Primoz Rebernik;Magrez, Arnaud
报道了亚甲基蓝(MB)在钛酸盐纳米线上的可逆二聚反应。用光谱方法研究了MB在该纳米结构材料表面的自组织性质，发现MB分子的光吸收性质与湿度有关。基于观察到的湿度依赖异色性，我们利用光纤技术制作了一种适用于医疗、工业或环境应用的湿度传感器。该传感器在8%至98%的相对湿度(RH)范围内具有良好的线性。该器件的响应和恢复时间可缩短至0.5S，且具有良好的重复性和低滞后特性。这些性能导致了该传感器在呼吸监测系统中的应用。此外，对其他染料也观察到了异染现象。这需要对功能表面上的分子构型进行详细的研究，因为它可以实质上改变染料的敏化效果，例如在光转换中。
We report on the reversible dimerization of methylene blue (MB) on titanate nanowires. 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 led to 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.