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      RuO2 supercapacitor enables flexible, safe, and efficient optoelectronic neural interface

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      Author(s)
      Karatum, O.
      Yildiz, E.
      Kaleli, H. N.
      Sahin, A.
      Ulgut, Burak
      Nizamoglu, S.
      Date
      2022-08-01
      Source Title
      Advanced Functional Materials
      Print ISSN
      1616-301X
      Publisher
      Wiley-VCH Verlag GmbH & Co. KGaA
      Volume
      32
      Issue
      31
      Pages
      2109365- 1 - 2109365- 12
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Optoelectronic biointerfaces offer a wireless and nongenetic neurostimulation pathway with high spatiotemporal resolution. Fabrication of low-cost and flexible optoelectronic biointerfaces that have high photogenerated charge injection densities and clinically usable cell stimulation mechanism is critical for rendering this technology useful for ubiquitous biomedical applications. Here, supercapacitor technology is combined with flexible organic optoelectronics by integrating RuO2 into a donor–acceptor photovoltaic device architecture that facilitates efficient and safe photostimulation of neurons. Remarkably, high interfacial capacitance of RuO2 resulting from reversible redox reactions leads to more than an order-of-magnitude increase in the safe stimulation mechanism of capacitive charge transfer. The RuO2-enhanced photoelectrical response activates voltage-gated sodium channels of hippocampal neurons and elicits repetitive, low-light intensity, and high-success rate firing of action potentials. Double-layer capacitance together with RuO2-induced reversible faradaic reactions provide a safe stimulation pathway, which is verified via intracellular oxidative stress measurements. All-solution-processed RuO2-based biointerfaces are flexible, biocompatible, and robust under harsh aging conditions, showing great promise for building safe and highly light-sensitive next-generation neural interfaces.
      Keywords
      Biointerfaces
      Neural interfaces
      Organic bioelectronics
      Photostimulation
      Supercapacitors
      Permalink
      http://hdl.handle.net/11693/111827
      Published Version (Please cite this version)
      https://doi.org/10.1002/adfm.202109365
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