Authors Lee, Y. ; Bandari, V. K. ; Li, Z. ; Medina-Sánchez, M. ; Maitz, M.F. ; Karnaushenko, D. ; Tsurkan, M. ; Karnaushenko, D. D. ; Schmidt, O. G.
Title Nano-biosupercapacitors enable autarkic sensor operation in blood
Date 23.08.2021
Number 59631
Abstract Today´s smallest energy storage devices for in-vivo applications are larger than 3·mm3 and lack the ability to continuously drive the complex functions of smart dust electronic and microrobotic systems. Here, we create a tubular biosupercapacitor occupying a mere volume of 1/1000·mm3 (=1 nanoliter), yet delivering up to 1.6·V in blood. The tubular geometry of this nano-biosupercapacitor provides efficient self-protection against external forces from pulsating blood or muscle contraction. Redox enzymes and living cells, naturally present in blood boost the performance of the device by 40% and help to solve the self-discharging problem persistently encountered by miniaturized supercapacitors. At full capacity, the nano-biosupercapacitors drive a complex integrated sensor system to measure the pH-value in blood. This demonstration opens up opportunities for next generation intravascular implants and microrobotic systems operating in hard-to-reach small spaces deep inside the human body.
Publisher Nature Communications
Citation Nature Communications 12 (2021) 4967

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