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Polymer coated silicon microring device for the detection of sub-ppm volatile organic compounds
- Source :
- Sensors and Actuators B: Chemical. 257:136-142
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- We present a polymer-coated silicon microring resonator to detect volatile organic compounds (VOC) gases. Absorption of VOC gases into the polymer alters the refractive index around the microring, which enables quantification of absorbed gases as a resonance wavelength shift in the resonator. Two different polymers, hyperbranched polyesteramid and poly(2-vinyl pyridine), are tested as the absorption layers on the highly sensitive (80 nm/RIU and 10,000 Q-factor) silicon microring resonator. The sensing responses to VOC gases are characterized by flowing four different gases: styrene, acetone, toluene, and isoprene, in a wide range of concentration (sub-ppm to 100 ppm range). The hyperbranched polyesteramid coated sensor shows the highest sensitivity to styrene. Similarly, Poly(2-vinyl pyridine) coated device exhibits sensitive responses to styrene and acetone. From experiments with a wide range of gas concentrations, we observe that the sensors have two distinguished characteristics; linear and non-linear response with respect to gas concentration. To account for it, a dual mode sensing mechanism is proposed; Langmuir mode (doping effect) in the low concentration (
- Subjects :
- Langmuir
Materials science
Silicon
Analytical chemistry
chemistry.chemical_element
02 engineering and technology
01 natural sciences
Styrene
chemistry.chemical_compound
Resonator
Materials Chemistry
Electrical and Electronic Engineering
Absorption (electromagnetic radiation)
Instrumentation
Isoprene
chemistry.chemical_classification
010401 analytical chemistry
Doping
Metals and Alloys
Polymer
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry
0210 nano-technology
Subjects
Details
- ISSN :
- 09254005
- Volume :
- 257
- Database :
- OpenAIRE
- Journal :
- Sensors and Actuators B: Chemical
- Accession number :
- edsair.doi...........7e582c05e3d07d30b8bc243c31a80277