Details

Autor(en) / Beteiligte

• Nowduri, Bharat
• Schulte, Steven
• Jolfaei, Negin Adavoudi
• Decker, Dominique
• Rabe, Holger
• Schäfer, Karl‐Herbert
• Saumer, Monika

Titel

Advanced Biomimetic Nanostructured Microelectrode Arrays for Enhanced Extracellular Recordings of Enteric Neurons

Ist Teil von

• Advanced materials interfaces, 2023-06, Vol.10 (16), p.n/a

Ort / Verlag

Weinheim: John Wiley & Sons, Inc

Erscheinungsjahr

2023

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Microelectrode surfaces covered with nanostructures derived from components of extracellular matrix, such as collagen fibers, have shown immense beneficial effects in promoting neuronal growth and cellular signaling. Synthetic nanostructures mimicking the features of biological nanostructures with durable conductive materials could promote the cell adhesion on microelectrode surfaces by providing topographical cues and simultaneously improve the charge transfer properties by reducing its global impedance. Therefore, an advanced nanostructuring method mimicking the structural and organizational features of natural collagen fibers onto metallic microelectrode surfaces has been presented here, which is adapted from previous technological achievements of the group and is based on nanoimprint lithography and gold electroplating. Surface characterization methods reveal an increase in surface area between 20% and 68% on the microelectrodes fabricated with two different nanostructure heights. Impedance spectroscopy measurements reveal reduction in impedance magnitude (at 1 kHz) between 22% and 41%, depending upon the nanostructure height and density on the microelectrode, which should subsequently modulate its charge transfer properties for biosensing application. Cell adhesion analysis performed with seal impedance measurements reveals a tighter coupling of enteric neurons on the nanostructured microelectrodes. Finally, extracellular recordings from enteric neurons exhibit a significant improvement in spike detection properties of the nanostructured microelectrodes. Advanced biomimetic nanostructured microelectrode arrays for enhanced extracellular recordings of enteric neurons have been fabricated with nanoimprint lithography and subsequent gold electroplating. The nanostructures mimic the cell adhesion properties of natural collagen fibers and enhance the signal transmission properties by reducing the global impedance of the microelectrode. Enteric neurons show excellent surface coupling by nanostructures and enhanced electrophysiological recordings.