Switchable biomimetic nanochannels for on-demand SO2 detection by light-controlled photochromism

Dan Zhang, Yongjie Sun, Zhichao Wang, Fang Liu and Xuanjun Zhang ()
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Dan Zhang: Faculty of Health Sciences, University of Macau, Taipa
Yongjie Sun: Faculty of Health Sciences, University of Macau, Taipa
Zhichao Wang: Faculty of Health Sciences, University of Macau, Taipa
Fang Liu: Faculty of Health Sciences, University of Macau, Taipa
Xuanjun Zhang: Faculty of Health Sciences, University of Macau, Taipa

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract In contrast to the conventional passive reaction to analytes, here, we create a proof-of-concept nanochannel system capable of on-demand recognition of the target to achieve an unbiased response. Inspired by light-activatable biological channelrhodopsin-2, photochromic spiropyran/anodic aluminium oxide nanochannel sensors are constructed to realize a light-controlled inert/active-switchable response to SO2 by ionic transport behaviour. We find that light can finely regulate the reactivity of the nanochannels for the on-demand detection of SO2. Pristine spiropyran/anodic aluminium oxide nanochannels are not reactive to SO2. After ultraviolet irradiation of the nanochannels, spiropyran isomerizes to merocyanine with a carbon‒carbon double bond nucleophilic site, which can react with SO2 to generate a new hydrophilic adduct. Benefiting from increasing asymmetric wettability, the proposed device exhibits a robust photoactivated detection performance in SO2 detection in the range from 10 nM to 1 mM achieved by monitoring the rectified current.

Date: 2023
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DOI: 10.1038/s41467-023-37654-y

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