Journal
ADVANCED MATERIALS
Volume 33, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202007848
Keywords
bioelectronics; conformal electrodes; plant electrophysiology; supramolecular hydrogels; thermogelling polymers
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Funding
- Agency for Science, Technology and Research under its AME Programmatic Funding Scheme [A18A1b0045]
- National Research Foundation, Prime Minister's Office, Singapore, under its NRF Investigatorship [NRF-NRFI2017-07]
- Singapore Ministry of Education [MOE2019-T2-2-022]
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By using a thermogel-based morphable ionic electrode, the challenge of stable and high-fidelity non-invasive electrophysiology on plant trichomes has been overcome. This electrode achieves one-tenth of the impedance and 4-5 times the adhesive strengths of conventional hydrogel electrodes on hairy leaves.
Plant electrophysiology lays the foundation for smart plant interrogation and intervention. However, plant trichomes with hair-like morphologies present topographical features that challenge stable and high-fidelity non-invasive electrophysiology, due to the inadequate dynamic shape adaptability of conventional electrodes. Here, this issue is overcome using a morphable ionic electrode based on a thermogel, which gradually transforms from a viscous liquid to a viscoelastic gel. This transformation enables the morphable electrode to lock into the abrupt hairy surface irregularities and establish a conformal and adhesive interface. It achieves down to one tenth of the impedance and 4-5 times the adhesive strengths of conventional hydrogel electrodes on hairy leaves. As a result of the improved electrical and mechanical robustness, the morphable electrode can record more than one order of magnitude higher signal-to-noise ratio on hairy plants and maintains high-fidelity recording despite plant movements, achieving superior performance to conventional hydrogel electrodes. The reported morphable electrode is a promising tool for hairy plant electrophysiology and may be applied to diversely textured plants for advanced sensing and modulation.
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