Advanced Nanostructured All-Waterborne Thiol-Ene/Reduced Graphene Oxide Humidity Sensors with Outstanding Selectivity
Journal
Advanced Materials Technologies published by Wiley-VCH GmbH
Date Issued
2023-05-26
Author(s)
Ana Trajcheva, Justine Elgoyhen, Maryam Ehsani, Yvonne Joseph, Jadranka B. Gilev, and Radmila Tomovska
DOI
10.1002/admt.202400114
Abstract
The current-state of polymer-based humidity sensors faces numerous
limitations, including energy-costly synthesis, low sensitivity, and slow
response times. This study presents innovative approach to overcome these
challenges, based on a robust all-water-borne in situ miniemulsion
polymerization. The use of water throughout the entire process mitigates the
negative environmental impact. Thiol-ene polymers reinforced with reduced
graphene oxide (rGO) with concentrations ranging from 0.2–1.0 wt% are
selected to fabricate these chemoresistive sensors. The selected thiol-enes
present high hydrophobicity and a semicrystalline nature, suggesting
resistance to early delamination even under prolonged exposure to humidity.
Incorporating rGO not only imparts electrical conductivity but also enhances
mechanical and water resistance of the composite films. The 0.6% rGO
composite exhibits optimal resistance for humidity sensing, demonstrating
rapid and consistent responses across three exposure cycles to water vapor
concentrations ranging 800–5000 ppm. Moreover, the sensor exhibits
remarkable selectivity toward water vapors over these of toluene, propanol,
and 4-methyl-2-pentanol, attributed to the high surface hydrophilicity and
inherent porosity of the waterborne film, and network structuring of rGO
platelets within the matrix. In summary, this study pioneers a novel approach
to polymer-based humidity sensing, addressing key limitations while offering
enhanced sensitivity, rapid response times, and superior selectivity.
limitations, including energy-costly synthesis, low sensitivity, and slow
response times. This study presents innovative approach to overcome these
challenges, based on a robust all-water-borne in situ miniemulsion
polymerization. The use of water throughout the entire process mitigates the
negative environmental impact. Thiol-ene polymers reinforced with reduced
graphene oxide (rGO) with concentrations ranging from 0.2–1.0 wt% are
selected to fabricate these chemoresistive sensors. The selected thiol-enes
present high hydrophobicity and a semicrystalline nature, suggesting
resistance to early delamination even under prolonged exposure to humidity.
Incorporating rGO not only imparts electrical conductivity but also enhances
mechanical and water resistance of the composite films. The 0.6% rGO
composite exhibits optimal resistance for humidity sensing, demonstrating
rapid and consistent responses across three exposure cycles to water vapor
concentrations ranging 800–5000 ppm. Moreover, the sensor exhibits
remarkable selectivity toward water vapors over these of toluene, propanol,
and 4-methyl-2-pentanol, attributed to the high surface hydrophilicity and
inherent porosity of the waterborne film, and network structuring of rGO
platelets within the matrix. In summary, this study pioneers a novel approach
to polymer-based humidity sensing, addressing key limitations while offering
enhanced sensitivity, rapid response times, and superior selectivity.
Subjects
File(s)![Thumbnail Image]()
Loading...
Name
Adv Materials Technologies - 2024 - Advanced Nanostructured All‐Waterborne Thiol‐Ene Reduced Graphene Oxide.pdf
Size
3.22 MB
Format
Adobe PDF
Checksum
(MD5):699c1fa7456371bd11aa318b5042bd5c