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Advisor(s)
Abstract(s)
Relative humidity is simultaneously a sensing target and a contaminant in gas
and volatile organic compound (VOC) sensing systems, where strategies to
control humidity interference are required. An unmet challenge is the creation
of gas-sensitive materials where the response to humidity is controlled by
the material itself. Here, humidity effects are controlled through the design of
gelatin formulations in ionic liquids without and with liquid crystals as electrical
and optical sensors, respectively. In this design, the anions [DCA]− and [Cl]− of
room temperature ionic liquids from the 1-butyl-3-methylimidazolium family
tailor the response to humidity and, subsequently, sensing of VOCs in dry and
humid conditions. Due to the combined effect of the materials formulations and
sensing mechanisms, changing the anion from [DCA]− to the much more hygroscopic
[Cl]−, leads to stronger electrical responses and much weaker optical
responses to humidity. Thus, either humidity sensors or humidity-tolerant VOC
sensors that do not require sample preconditioning or signal processing to correct
humidity impact are obtained. With the wide spread of 3D- and 4D-printing
and intelligent devices, the monitoring and tuning of humidity in sustainable
biobased materials offers excellent opportunities in e-nose sensing arrays and
wearable devices compatible with operation at room conditions
Description
Research Article
Keywords
humidity sensing mechanisms
Pedagogical Context
Citation
Adv. Mater. 2022, 2107205
Publisher
Wiley-VCH