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Sample Preparation in Quartz Crystal Microbalance Measurements of Protein Adsorption and Polymer Mechanics
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Polymer-Plasticizer Coatings for BTEX Detection Using Quartz Crystal Microbalance.

Abhijeet Iyer1, Veselinka Mitevska1, Jonathan Samuelson1

  • 1Department of Chemical, Biological, and Materials Engineering, University of South Florida, Tampa, FL 33620-5350, USA.

Sensors (Basel, Switzerland)
|August 28, 2021
PubMed
Summary

New polymer-plasticizer films detect volatile organic compounds (VOCs) like BTEX at low concentrations. A novel diffusion model quantifies VOC mixtures using response times, eliminating the need for sensor arrays.

Keywords:
diffusionplasticizationpolymersquantifysensitivity

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • Volatile organic compounds (VOCs) pose environmental and health risks.
  • Accurate detection of VOCs like benzene, ethylbenzene, and toluene (BTEX) is crucial.
  • Current detection methods often rely on complex sensor arrays.

Purpose of the Study:

  • To develop and optimize polymer-plasticizer sensing films for BTEX detection.
  • To investigate the influence of plasticizers on film sensitivity and selectivity.
  • To establish a quantitative model for analyzing VOC mixtures using a single sensor film.

Main Methods:

  • Fabrication and characterization of polymer-plasticizer sensing films.
  • Quartz crystal microbalance (QCM) analysis of VOC interactions with films.
  • Diffusion studies to model analyte absorption and film saturation dynamics.
  • Correlation of QCM frequency-time data with gas-phase analyte composition and partition coefficients.

Main Results:

  • PEMA-DINCH (5%) and PEMA-DIOA (5%) films showed optimal performance for BTEX detection.
  • Sensitivity and selectivity were successfully tuned by varying plasticizer type and concentration.
  • A diffusion model accurately quantified BTEX concentrations in binary and ternary mixtures using response times (τ).
  • The developed model enabled quantification from a single film, outperforming traditional sensor arrays.

Conclusions:

  • Polymer-plasticizer coatings offer a viable solution for detecting and quantifying BTEX in air.
  • Plasticizer selection is key to optimizing sensor film performance.
  • The developed diffusion model provides a simplified yet accurate method for analyzing VOC mixtures.