Polymer optical waveguide sensor based on fe-amino-triazole complex molecular switches
- authored by
- Muhammad Shaukat Khan, Hunain Farooq, Christopher Wittmund, Stephen Klimke, Roland Lachmayer, Franz Renz, Bernhard Roth
- Abstract
We report on a polymer-waveguide-based temperature sensing system relying on switch-able molecular complexes. The polymer waveguide cladding is fabricated using a maskless litho-graphic 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◦ C and sensitivity of 0.08 mW/◦ C. This enables optical rather than electronic temperature detection in environments where electromagnetic interference might influence the measurements.
- Organisation(s)
-
Institute of Inorganic Chemistry
Institute of Motion Engineering and Mechanism Design
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
Hannover Centre for Optical Technologies (HOT)
- Type
- Article
- Journal
- Polymers
- Volume
- 13
- Pages
- 1-10
- No. of pages
- 10
- ISSN
- 2073-4360
- Publication date
- 07.01.2021
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Chemistry(all), Polymers and Plastics
- Electronic version(s)
-
https://doi.org/10.3390/polym13020195 (Access:
Open)