Photonic NO2 Gas Sensing with Binaphthyl‐Based Dopants
Photonic NO2 Gas Sensing with Binaphthyl‐Based Dopants
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DOI：
10.1002/adom.202001828
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发表时间：
2021-01
影响因子：
9
通讯作者：
Matthias Spengler;L. Pschyklenk;J. Niemeyer;P. Kaul;M. Giese
中科院分区：
文献类型：
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作者：
Matthias Spengler;L. Pschyklenk;J. Niemeyer;P. Kaul;M. Giese
制备了一系列反应性双萘基二亚胺掺杂剂，并研究了它们在向列相液晶混合物E7中手性诱导结构显色和二氧化氮（NO2）选择性光子传感的潜力。对4‐氰基‐4′‐戊基联苯（5CB）的螺旋扭转力（HTP）进行了研究，发现HTP值高达375µm‐1，结构相容性和二面体联苯角的变化对手性转移效率有巨大影响。对该系统传感能力的详细研究表明，该系统对NO2具有非常高的选择性，对低至100 ppm的浓度也有响应。该系统显示出对分析物气体的直接响应，导致反射波长的浓度相关位移高达几百纳米。铜离子的掺入显著提高了传感器在灵敏度和选择性方面的性能，能够对系统的性能进行量身定制的调整。
A series of reactive binaphthyl‐diimine‐based dopants is prepared and investigated with respect to their potential for the chiral induction of structural coloration in nematic liquid crystal mixture E7 and the selective photonic sensing of nitrogen dioxide (NO2). Studies of the helical twisting power (HTP) in 4‐cyano‐4′‐pentylbiphenyl (5CB) reveal HTP values as high as 375 µm‐1 and the tremendous impact of structural compatibility and changes of the dihedral binaphthyl angle on the efficiency of the chiral transfer. Detailed investigation of the sensing capabilities of the systems reveals an extraordinarily high selectivity for NO2 and a response to concentrations as low as 100 ppm. The systems show a direct response to the analyte gas leading to a concentration‐dependent shift of the reflectance wavelength of up to several hundred nanometers. Incorporation of copper ions remarkably improves the sensor's properties in terms of sensitivity and selectivity, enabling the tailored tweaking of the system's properties.