AI Article Synopsis
- Dielectric mirrors made from SEBS and PVA-ZrO nanocomposites are developed for detecting vapor, with their layers swelling in response to specific solvents, causing a red-shift in reflection.
- The mirrors leverage PVA's sensitivity to water and SEBS's response to various organic solvents, leading to a broad detection range.
- Incorporating dual-functional ZrO nanoparticles enhances the mirrors' refractive index contrast and permeability, resulting in faster response times to solvent vapors and allowing for improved prediction of sensor accuracy based on solvent-polymer interactions.
Article Abstract
Dielectric mirrors based on bilayers of polystyrene- block-poly(ethylene- ran-butylene)- block-polystyrene (SEBS) and poly(vinyl alcohol) (PVA)-zirconium dioxide (ZrO) nanocomposites are fabricated for vapor sensing. When exposed to specific solvent vapor, the layers of dielectric mirrors can gradually swell and cause a red-shift of the reflection band. Because PVA solely responds to water and SEBS is sensitive to several different types of organic solvents, the mirrors can respond to a large variety of solvents. The dual-functional hydrophilic ZrO nanoparticles are introduced to not only enlarge the refractive index contrast but also increase the permeability. Time-resolved measurements show that mirrors with nanoparticles have a significantly faster response than those without nanoparticles. Moreover, the dependence on relative humidity is studied for representative solvents, and several types of solvents are selected to show the dependence on the solvent-polymer interaction parameters at typical relative humidity, which allows one to predict the responsivity and selectivity of the sensors.
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| http://dx.doi.org/10.1021/acsami.8b11434 | DOI Listing |
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