TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Pschyklenk, Lukas
A1  - Wagner, Thorsten
A1  - Lorenz, Alexander
A1  - Kaul, Peter
T1  - Optical Gas Sensing with Encapsulated Chiral-Nematic Liquid Crystals
JF  - ACS Applied Polymer Materials
N2  - Optical gas sensors based on chiral-nematic liquid crystals (N* LCs) forming one-dimensional photonic crystals do not require electrical energy and have a considerable potential to supplement established types of sensors. A chiral-nematic phase with tunable selective reflection is induced in a nematic host LC by adding reactive chiral dopants. The selective chemical reaction between dopant and analyte is capable to vary the pitch length (the lattice constant) of the soft, self-assembled, one-dimensional photonic crystal. The progress of the ongoing chemical reaction can be observed even by naked eye because the color of the samples varies. In this work, we encapsulate the responsive N* LC in microscale polyvinylpyrrolidone (PVP) fibers via coaxial electrospinning. The sensor is, thus, given a solid form and has an improved stability against nonavoidable environmental influences. The reaction behavior of encapsulated and nonencapsulated N* LC toward a gaseous analyte is compared, systematically. Making use of the encapsulation is an important step to improve the applicability.
KW  - liquid crystal
KW  - chiral-nematic
KW  - tunable pitch
KW  - low molecular weight
KW  - coaxial electrospinning
KW  - encapsulation
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-48894
SN  - 2637-6105
SS  - 2637-6105
U6  - https://doi.org/10.1021/acsapm.0c00142
DO  - https://doi.org/10.1021/acsapm.0c00142
VL  - 2
IS  - 5
SP  - 1925
EP  - 1932
PB  - American Chemical Society (ACS)
ER  -