Medical Design Briefs - August 2021 - 15

double-layer capacitance. The laser restructured Pt10Ir electrodes,
on the other hand, exhibit substantially larger voltammagrams
that are both semirectangular, indicating double-layer
capacitance similar to TiN, and also contain an oxidation peak
at 0.8 V and a small reduction peak near 0.1 V inherent to Pt10Ir
as shown in the inset CV voltammagram of Pt10Ir. Impedance
was measured using EIS over a 0.1-105 Hz frequency range
using a 10 mV root-mean-square (rms) sinusoidal excitation voltage
about a fixed potential between -0.6 and 0.8 V. All measurements
were made with Gamry potentiostats and vendor-supplied
software. All data reported for EIS are an average of three samples
per restructuring condition, tested three times, i.e., a total
of nine measurements. Most notably, at frequencies below 1000
Hz, EIS tests and impedance measurements (see Figure 8)
exhibit approximately up to two orders of magnitude reduction
in impedance for hierarchically restructured electrodes compared
to pristine Pt10Ir electrodes. At higher frequencies, all
electrodes exhibit resistive behavior dominated by electrolyte
conductivity. Specific capacitance was calculated using EIS data
and common Randles model.
MDM West
Booth #3119
Surface Tunability
One of the advantages of hierarchically restructured surfaces
compared to TiN coatings is the ability to tune the surface
topography and porosity and thus engineer its ESA. TiN exhibits
large CSC at slow sweep rates, but at higher sweep rates, access
to all the available charge is limited by pore resistance of TiN
and the tightly packed nature of the TiN pillars contrary to hierarchically
restructured electrodes (see Figure 9).
Use of ultrashort pulse lasers enables restructuring with various
surface topographies, pore size, depth, and intercolumnar spacing
to reduce pore resistance in order to increase CSC and specific
capacitance as shown in Figures 7 and 10. CV tests and CSCtotal
measurements demonstrate more than 80-fold increase in total
charge storage capacity (CSCtotal) and over 400-fold increase in
specific capacitance of Pt10Ir electrodes via hierarchical laser
restructuring (see Figure 10). The results also demonstrate that
the charge storage capacity and specific capacitance of hierarchically
restructured electrodes exceed that of TiN coatings.
Every electrode or microelectrode array has very specific
electrochemical performance requirements for an intended
application. The tunability and flexibility of this technology for
the design of optimal surface topographies make ultrashort
pulse laser technology commercially viable, cost-effective, and
capable of revolutionizing the electrode, microelectrode array,
and long-term implantable device markets.
Despite the favorable electrochemical properties of various
coating technologies, there are challenges associated with the
majority of these techniques, such as poor adhesion of the
coatings to the underlying substrate or electrode surface, low
structural and chemical stability, and poor long-term durability.
In most vacuum coating technologies, undesired thermal
stresses are also introduced into the coating structure, which in
turn leads to durability and performance issues.
Hierarchical laser restructuring technology offers numerous
promises from material, manufacturing, and cost perspectives,
and also from an improved performance viewpoint. The technology
is an ideal candidate for next-generation sensing, recording,
and stimulating electrode and microelectrode array applications.
This article was written by Dr. Shahram Amini, Director of Research
and Development, Pulse Technologies, Quakertown, PA. For more information,
visit http://info.hotims.com/79416-341.
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Medical Design Briefs - August 2021

Table of Contents for the Digital Edition of Medical Design Briefs - August 2021

Medical Design Briefs - August 2021 - Intro
Medical Design Briefs - August 2021 - Cov4
Medical Design Briefs - August 2021 - Cov1a
Medical Design Briefs - August 2021 - Cov1b
Medical Design Briefs - August 2021 - Cov1
Medical Design Briefs - August 2021 - Cov2
Medical Design Briefs - August 2021 - 1
Medical Design Briefs - August 2021 - 2
Medical Design Briefs - August 2021 - 3
Medical Design Briefs - August 2021 - 4
Medical Design Briefs - August 2021 - 5
Medical Design Briefs - August 2021 - 6
Medical Design Briefs - August 2021 - 7
Medical Design Briefs - August 2021 - 8
Medical Design Briefs - August 2021 - 9
Medical Design Briefs - August 2021 - 10
Medical Design Briefs - August 2021 - 11
Medical Design Briefs - August 2021 - 12
Medical Design Briefs - August 2021 - 13
Medical Design Briefs - August 2021 - 14
Medical Design Briefs - August 2021 - 15
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Medical Design Briefs - August 2021 - Cov3
Medical Design Briefs - August 2021 - Cov4
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