Polymer Optical Waveguide Sensor Based On Fe-Amino-Triazole Complex Molecular Switches
POLYMERS(2021)
摘要
We report on a polymer-waveguide-based temperature sensing system relying on switchable molecular complexes. The polymer waveguide cladding is fabricated using a maskless lithographic optical system and replicated onto polymer material (i.e., PMMA) using a hot embossing device. An iron-amino-triazole molecular complex material (i.e., [Fe(Htrz)(2.85)(NH2-trz)(0.15)](ClO4)(2)) is used to sense changes in ambient temperature. For this purpose, the core of the waveguide is filled with a mixture of core material (NOA68), and the molecular complex using doctor blading and UV curing is applied for solidification. The absorption spectrum of the molecular complex in the UV/VIS light range features two prominent absorption bands in the low-spin state. As temperature approaches room temperature, a spin-crossover transition occurs, and the molecular complex changes its color (i.e. spectral properties) from violet-pink to white. The measurement of the optical power transmitted through the waveguide as a function of temperature exhibits a memory effect with a hysteresis width of approx. 12 degrees C and sensitivity of 0.08 mW/degrees C. This enables optical rather than electronic temperature detection in environments where electromagnetic interference might influence the measurements.
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关键词
polymer optical sensor, microfabrication, temperature sensor, memory effect, iron-triazole complexes, hot embossing, maskless lithography
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