Superhydrophobic n-octadecylsiloxane (PODS)-functionalized PDA-PEI film as efficient water-resistant sensor for ppb-level hexanal detection
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | 125755 |
Journal / Publication | Chemical Engineering Journal |
Volume | 399 |
Online published | 4 Jun 2020 |
Publication status | Published - 1 Nov 2020 |
Externally published | Yes |
Link(s)
Abstract
The detection of hexanal vapor in ppb (part per billion) concentration is an unresolved and indispensable issue. Here we report a polydopamine-polyethyleneimine (PDA-PEI) copolymer film with rich imino groups to sense 50 ppb hexanal vapor through the formation of the reversible hydrogen bonds with hexanal. We found that the water-resistance could be further improved by attaching superhydrophobic n-octadecylsiloxane (PODS) onto the surface of PDA-PEI film. The chemical adsorption mode and the core role of imino group for the hexanal detection have been validated by combining experiment methods with theory calculations. A quartz crystal microbalance (QCM) platform modified with this film was employed as a hexanal vapor sensor under ambient conditions, which possessed several advantages including the high response of 34.8 Hz to 250 ppb hexanal, low detection limit of 50 ppb hexanal at 25 °C, and good water-resistance.
Research Area(s)
- Gas sensor, Hexanal, Polymer, Quartz crystal microbalances, Water-resistant
Citation Format(s)
Superhydrophobic n-octadecylsiloxane (PODS)-functionalized PDA-PEI film as efficient water-resistant sensor for ppb-level hexanal detection. / Wang, Luyu; Wu, Yunling; Li, Gaojie et al.
In: Chemical Engineering Journal, Vol. 399, 125755, 01.11.2020.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review