High-performance iridium oxide/platinum nano-leaf composite coatings on microelectrodes for neural stimulation/recording

2017 ◽  
Author(s):  
Qi Zeng ◽  
Kai Xia ◽  
Bin Sun ◽  
Tianzhun Wu ◽  
Mark S. Humayun
Keyword(s):  
High Performance ◽  
Composite Coatings ◽  
Iridium Oxide ◽  
Neural Stimulation

scholarly journals Fabrication of Iridium Oxide/Platinum Composite Film on Titanium Substrate for High-Performance Neurostimulation Electrodes

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 420
Author(s):  
Tsai-Wei Chung ◽  
Chih-Ning Huang ◽  
Po-Chun Chen ◽  
Toshihiko Noda ◽  
Takashi Tokuda ◽  
...  
Keyword(s):  
Chemical Bath Deposition ◽  
High Performance ◽  
Electrode Materials ◽  
Composite Films ◽  
Titanium Substrate ◽  
Contact Angles ◽  
Iridium Oxide ◽  
Neural Stimulation ◽  
Charge Storage ◽  
Before And After

Electrode materials for neural stimulation have been widely investigated for implantable devices. Among them, iridium and iridium oxide are attractive materials for bio-interface applications due to their desirable stability, electrochemical performance, and biocompatibility. In this study, iridium oxide/platinum (IrOx/Pt) composite films were successfully fabricated on titanium substrates by chemical bath deposition and these films are expected to be used as biocompatible stimulation electrodes. We modified the film compositions to optimize the performances. In addition, these IrOx/Pt composite films were characterized before and after annealing by SEM and XRD. We also identified the hydrophilicity of these iridium oxide/platinum composite films by measuring contact angles. Finally, the charge storage capacities of these iridium oxide/platinum composite films were evaluated by an electrochemical workstation. As a result, the charge storage capacities of the iridium oxide/platinum composite films are largely increased, and this leads to a very efficient neurostimulation electrode. Additionally, we successfully demonstrated the chemical bath deposition of IrOx film on the surface of the bullet-shaped titanium microelectrode.

scholarly journals Correlation of Impedance and Effective Electrode Area of Iridium Oxide Neural Electrodes

2017 ◽  
Vol 70 (9) ◽  
pp. 1016 ◽  
Author(s):  
Alexander R. Harris ◽  
Antonio G. Paolini
Keyword(s):  
Charge Density ◽  
Iridium Oxide ◽  
Neural Stimulation ◽  
Electrode Impedance ◽  
Platinum Electrodes ◽  
High Charge ◽  
State Diffusion ◽  
High Charge Density ◽  
Steady State Diffusion ◽  
Total Activation

Iridium oxide is routinely used for bionic applications owing to its high charge injection capacity. The electrode impedance at 1 kHz is typically reported to predict neural recording performance. In this article, the impedance of activated iridium oxide films (AIROFs) has been examined. The impedance of unactivated iridium electrodes was half that of platinum electrodes of similar geometry, indicating some iridium oxide was present on the electrode surface. A two time constant equivalent circuit was used to model the impedance of activated iridium. The impedance at low and intermediate frequencies decreased with increasing number of activation pulses and total activation charge. The impedance at 12 Hz correlated with the steady-state diffusion electroactive area. The impedance at 12 Hz also correlated with the charge density of the electrode. The high charge density and low impedance of AIROFs may provide improved neural stimulation and recording properties compared with typically used platinum electrodes.

A Comparison of TiN, Iridium and Iridium Oxide Stimulating Electrodes for Neural Stimulation

2012 ◽  
Author(s):  
Naser Pour Aryan ◽  
Christian Brendler ◽  
Viola Rieger ◽  
Steffen Kibbel ◽  
Alex Harscher ◽  
...  
Keyword(s):  
Iridium Oxide ◽  
Neural Stimulation ◽  
Stimulating Electrodes

scholarly journals High‐charge‐capacity sputtered iridium oxide neural stimulation electrodes deposited using water vapor as a reactive plasma constituent

2019 ◽  
Vol 108 (3) ◽  
pp. 880-891 ◽  
Author(s):  
Jimin Maeng ◽  
Bitan Chakraborty ◽  
Negar Geramifard ◽  
Tong Kang ◽  
Rashed T. Rihani ◽  
...  
Keyword(s):  
Water Vapor ◽  
Iridium Oxide ◽  
Neural Stimulation ◽  
Charge Capacity ◽  
High Charge ◽  
Reactive Plasma

Study of Damage Mechanisms in Cold-Sprayed 316L-Matrix Composite Coatings Using Novel Impact-Sliding Testing

2014 ◽  
Vol 922 ◽  
pp. 452-462 ◽  
Author(s):  
R. Maestracci ◽  
N. Fabrègue ◽  
M. Jeandin ◽  
G. Bouvard ◽  
M. Messaadi ◽  
...  
Keyword(s):  
Cold Spray ◽  
High Performance ◽  
Composite Coatings ◽  
Industrial Applications ◽  
Damage Mechanisms ◽  
Coating Composition ◽  
Before And After ◽  
Coating Microstructure ◽  
Service Conditions ◽  
Sliding Test

Cold spray is now well recognized as one of the most powerful and efficient coating process because it is cost-attractive and “green”. However, this process still shows limitations to achieve coatings for highly-demanding service conditions such as those required in certain automotive and/or aircraft applications. Beyond these limitations, cold spray is expected to compete with conventional P/M routes.The present work therefore focussed on the study of damage mechanisms in cold-sprayed AISI 316L and 316L-matrix–Cu composites coatings due to high-loading conditions. Different damage mechanisms could occur depending on the content of Cu particle addition, due to changes in the response of the microstructure to the loading. These mechanisms were studied using the newly-developed “impact-sliding” test. In this test, a steel ball impacts the coating surface at a given frequency, with a fixed angle. The influence of major testing parameters was investigated.Microstructures before and after testing were studied using optical microscopy, scanning electron microscopy (SEM), and microprobe analysis in addition to 3D optical profilometry of impacted areas. Damage mechanisms were seen to be of two types, i.e. plastic deformation and wear. These resulted in decohesion of splats, formation of wear debris and formation of a layer with a tribologically-transformed structure (TTS) at the contact surface.Results showed that cold spray could be claimed to be suitable for the achievement of high-performance coatings for industrial applications provided that the coating microstructure can be controlled. This could be done using a composite approach to the coating composition.

Assessment of high performance SAPO ‐34/ S‐PEEK composite coatings for adsorption heat pumps

2020 ◽  
Vol 138 (12) ◽  
pp. 50076
Author(s):  
Luigi Calabrese ◽  
Davide Palamara ◽  
Paolo Bruzzaniti ◽  
Edoardo Proverbio
Keyword(s):  
High Performance ◽  
Composite Coatings ◽  
Heat Pumps ◽  
Adsorption Heat ◽  
Peek Composite
Sign in / Sign up

Export Citation Format

Share Document