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1 , TNO, Senior Scientist Sensor Materials Photonic Crystals as Gas and Liquid Sensors 1 Competence matrix Sector R&D Technology Application Market Photonics for green energy & environment Lighting for well being Agriculture & food Solar fuels Optical communication Business development, best practices Photovoltaics Healthcare Safety & security Lifescience (microscopy) Integrated photonics Solid state lighting technology Metrology & sensing Photonics technologies for machining Optical Design Computer Vision 1
2 2 Content Goal Principle of Photonic Crystals Nano Imprint Lithography (NIL) Responsive Polymers Examples FP7 - Photosens 3 Polymer Photonic Crystal Sensors: Goal Chemical sensing of small molecules based on changes in refractive index and swelling of Nanostructured Materials Advantages: Direct visual information Inexpensive and disposable Can be integrated in existing products or processes (e.g. nanoimprinting) Disadvantage: Moderate selectivity Light reflected on nanostructured surface 2
3 4 Photonic Crystals (1/2) Periodic pattern of high and low refractive index material Opals (3D) Fiber Bragg Gratings (1D) Reflection of small wavelength range: = 2 n d sin Opals A shift in reflected wavelength occurs upon: Swelling d Chemical change n FBG 5 2D Photonic Crystals (2/2) Pillars or holes on surface Easy manufacturable (e.g. Nano-imprinting or embossing) Large surface area (roll-to-roll processing) Suitable for integration with chemical responsive polymers 3
4 6 Nano Imprint Lithography (1/2) Replication of nanostructures in chemically responsive polymer Nickel master Siloxane polymer Chemical responsive polymer 7 Nano Imprint Lithography (2/2) Nickel or silicon master Silicone replica Sensor surface Polymer imprint 4
5 counts peak wavelength (nm) 8 Chemical Responsive Polymers Polymers that change an optical property upon chemical exposure Polyacrylate based polymers; Functional monomer building blocks for sensing: Solvents C C Gasses C=O Functional additives for sensing: R ph Biomolecules Combination of functionalities: Chemical responsive UV-curable Imprintable (suitable viscosity) 9 Example1: Toluene sensing Toluene applied to sensor surface evaporates wavelength (nm) Reflection peak maximum shifts gradually time Substrate time (sec) 5
6 peak wavelength (nm) counts Titel van de presentatie :41 10 Example2: Acetone sensing Acetone applied to sensor surface evaporates sec 130 sec 150 sec 200 sec wavelength (nm) Reflection peak maximum decreases abruptly and increases again time (sec) 11 Photosens FP7 European project on roll-to-roll manufacturing of Photonic Crystal chemical sensors for: Environmental monitoring Pharmaceutical sensing 6
7 12 Photosens Photonic Crystal Platform Application of thin sensor layers on (nano)structured surfaces and particles Imprinted polymer Substrate Polymer Photonic Crystal Sensor polymer Thin surface layer Coated nanoparticles Blended with polymer 13 Modelling of nanostructures (Southampton) 7
8 14 Manufacturing steps 15 Environmental sensing Functionalization of Photonic Crystal platform: Chemical receptors: chemical reaction causes change in refractive index Molecular Imprinted Polymers: gas molecules are captured in cavities in the polymer Target gasses for environmental monitoring: Formaldehyde, H 2 S, CO 2, acetone, BTX, 8
9 16 Chemical receptors Rv/M Contribution of chemical groups to refractive index F -CH3 -HC=O cyanide -NH2 -OH -COOH -NO2 -Cl -OCOO- -CH2- cyclohexyl -COO- -O- -SH >C=O phenyl -NH- -CONH- -Smop-phenylene >CH- >N- >C< 17 First results on chemical receptors Change in refractive index of chemical receptor is monitored using ellipsometer and gas flow cell 9
10 18 Next steps Characterisation of chemical receptor layers Start exposure of formaldehyde in elipsometer Integration of chemical responsive layers with Photonic Crystal Sensor Design In and out coupling of light to/from the sensor chips 19 Thank you for your attention For more information please contact: Dr. TNO De Rondom 1 PO Box HE Eindhoven The Netherlands arjen.boersma@tno.nl Office: +31 (0) General: +31 (0)
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