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. Author manuscript; available in PMC: 2020 Jul 1.
Published in final edited form as: Adv Opt Mater. 2020 Apr 8;8(11):1902117. doi: 10.1002/adom.201902117

Figure 9.

Figure 9

Polarized optical microscopy images of a thin film of E7 supported on a gold surface, for NO2 detection in real time. When viewed between crossed polarizers the sensor appears bright before NO2 exposure (1) and dark when exposed to NO2 (2), due to binding of NO2 on the gold that leads the LC to an orientational transition. The corresponding transmitted light response shows the selectivity of the sensor towards NO2, since it does not respond when exposed to other gases such as ammonia, ethanol etc. Adapted with permission.[46] Copyright 2013, Elsevier B.V.