Durability of high surface area platinum deposits on microelectrode arrays for acute neural recordings

Gergely Márton, I. Bakos, Zoltán Fekete, I. Ulbert, Anita Pongrácz

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The durability of high surface area platinum electrodes during acute intracerebral measurements was investigated. Electrode sites with extremely rough surfaces were realized using electrochemical deposition of platinum onto silicon-based microelectrode arrays from a lead-free platinizing solution. The close to 1000-fold increase in effective surface area lowered impedance, its absolute value at 1 kHz became about 7 and 18 % of the original Pt electrodes in vitro and in vivo, respectively. 24-channel probes were subjected to 12 recording sessions, during which they were implanted into the cerebrum of rats. Our results showed that although on the average the effective surface area of the platinized sites decreased, it remained more than two orders of magnitude higher than the average effective surface area of the original, sputtered thin-film platinum electrodes. Sites with electrochemical deposits proved to be superior, e.g. they provided less thermal and 50 Hz noise, even after 12 penetrations into the intact rat brain.

Original languageEnglish
Pages (from-to)931-940
Number of pages10
JournalJournal of Materials Science: Materials in Electronics
Volume25
Issue number3
DOIs
Publication statusPublished - 2014

Fingerprint

Microelectrodes
Platinum
Electrodes
Durability
Deposits
Rats
Cerebrum
Silicon
Electric Impedance
Noise
Hot Temperature
Brain
Lead
Thin films

ASJC Scopus subject areas

  • Biophysics
  • Biomaterials
  • Bioengineering
  • Biomedical Engineering

Cite this

Durability of high surface area platinum deposits on microelectrode arrays for acute neural recordings. / Márton, Gergely; Bakos, I.; Fekete, Zoltán; Ulbert, I.; Pongrácz, Anita.

In: Journal of Materials Science: Materials in Electronics, Vol. 25, No. 3, 2014, p. 931-940.

Research output: Contribution to journalArticle

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