Controlled activation of iridium film for AIROF microelectrodes

Kang, Xiaoyang; Liu, Jingquan; Tian, Hong-Chang; Zhang, Chuan; Nuli, Yanna; Zhu, Heng; Yang, Chunsheng

doi:10.1016/j.snb.2013.08.085

Cited by 21 publications

(16 citation statements)

References 70 publications

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“…It should be noted that the oxidizing electrochemical activation of the metal iridium coatings formed by MOCVD is more effective than that of the electron-beam evaporated samples: only 9.7 mC•cm -2 CSC values of AIROFs in physiological saline solution (100 mV•s -1 ) have been achieved in the last case after 1000 activation cycles in 0.1M H2SO4 [19]. Also, the CSC values of the samples obtained in the present work are noticeably higher than the typical values given in the literature for AIROF electrodes formed from iridium wire and sputtered iridium during other activation procedures: 4.4-40.3 mC•cm -2 (in PBS or physiological solution, 100 mV•s -1 ) [46]. Therefore MOCVD seems to be promising as a "first-step method" to obtain AIROFs probably because in this case metal iridium coating with more developed surface are formed.…”

Section: Electrochemical Properties Of Activated Ir Layerscontrasting

confidence: 55%

“…In addition to direct application of Ir electrodes, one of the promising directions for the utilization of the metallic iridium films is their electrochemical activation to produce activated iridium oxide films (AIROFs) [41][42][43][44][45][46][47]. AIROF-coated electrodes are characterized by significantly lower impedance which is important both for cardiac pacing [1,42,[47][48][49] and for neurostimulation [2,43,[44][45][46]. Following to this trend, in the present work we performed the oxidizing electrochemical activation of the obtained metal samples in a sulfuric acid medium.…”

Section: Electrochemical Properties Of Activated Ir Layersmentioning

confidence: 99%

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Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

Vikulova

Kal’nyi

Shubin

et al. 2017

Applied Surface Science

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The present work demonstrates the application of the Metal-Organic Chemical Vapor Deposition technique to fabricate metal iridium coatings onto the pole tips of endocardial electrodes. Using iridium (III) acetylacetonate as volatile precursor, the target coatings were successfully applied to the working surface of cathodes and anodes of pacemaker electrodes in the flow type reactor in hydrogen atmosphere at deposition temperature of 550°C. The coating samples were characterized by means of XRD, SEM, Raman-and XPS-spectroscopies. The formation of non-textured coatings with fractal-like morphology and 7-24 nm crystallite size has been realized. The electrochemical properties of the coatings were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The charge storage capacity values of the electrochemically activated samples were 17.0-115 mC•cm-2 and 14.4-76.5 mC•cm-2 for measurements carried out in 0.1M sulfuric acid and in phosphate buffer saline solutions, respectively. A comparison of some characteristics of the samples obtained with commercially available cathode of pacemaker electrodes is also presented.

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Section: Electrochemical Properties Of Activated Ir Layerscontrasting

confidence: 55%

Section: Electrochemical Properties Of Activated Ir Layersmentioning

confidence: 99%

Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

Vikulova

Kal’nyi

Shubin

et al. 2017

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…Based on our previously study [5], the AIROF was activated in physiological saline solution (0.9 % NaCl) from iridium film at pH=7. For one activation cycle, the potential is swept from −1.0 to 1.0 V at 0.05 Hz.…”

Section: B Airofmentioning

confidence: 99%

Fabrication and electrochemical comparison of SIROF-AIROF-EIROF microelectrodes for neural interfaces

Kang

Liu

Tian

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Iridium oxide has been widely used in neural recording and stimulation due to its good stability and large charge storage capacity (CSC). In general, the iridium oxide film used in the electrophysiological application can be grouped into three principal classifications: sputtering iridium oxide film (SIROF), activated iridium oxide film (AIROF) and electrodeposited iridium oxide film (EIROF). Although these kinds of iridium oxide all can remarkably reduce the impedance and increase the CSC of the microelectrode, they also exhibit markedly differences in electrochemical performances. After activation, the CSC of EIROF is 68.20 mC/cm(2), which is 88.7 % larger than that of the SIROF and 67.6 % larger than that of the AIROF. The impedance at 1 kHz of the three kinds of iridium oxide microelectrode is around 4000 ohm, it is acceptable for the neural interface application. The phase at 1 kHz of the AIROF microelectrode is the largest which is -6.1 degree, about 22.6 % of the SIROF and 44.5 % of the EIROF.

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“…Xiaoyang Kang and Jingquan Liu et al of Shanghai Jiao Tong University also developed iridium oxide (IrOx) as an important electrochemical modification material for neural interface, which exhibited considerable value in neural stimulation and recording applications [67][68][69][70][71]. There were various kinds of preparation methods for IrOx, including: sputtering iridium oxide film (SIROF), activated iridium oxide film (AIROF) and electrodeposited iridium oxide film (EIROF), as shown in Figure 8a-c. For SIROF, the iridium atom combined with oxygen atom under vacuum condition to form IrOx.…”

Section: Electrode-tissue Interface For Neural Interfacementioning

confidence: 99%

Progress in Research of Flexible MEMS Microelectrodes for Neural Interface

Tang¹,

Tian²,

Kang³

et al. 2017

Preprint

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Abstract:With the rapid development of MEMS (Micro-electro-mechanical Systems) fabrication technologies, manifolds microelectrodes with various structures and functions have been designed and fabricated for applications in biomedical research, diagnosis and treatment through electrical stimulation and electrophysiological signal recording. The flexible MEMS microelectrodes exhibit multi-aspect excellent characteristics beyond stiff microelectrodes based on silicon or SU-8, which comprising: lighter weight, smaller volume, better conforming to neural tissue and lower fabrication cost. In this paper, we mainly reviewed key technologies on flexible MEMS microelectrodes for neural interface in recent years, including: design and fabrication technology, flexible MEMS microelectrodes with fluidic channels and electrode-tissue interface modification technology for performance improvement. Furthermore, the future directions of flexible MEMS microelectrodes for neural interface were described including transparent and stretchable microelectrodes integrated with multi-aspect functions and next-generation electrode-tissue interface modifications facilitated electrode efficacy and safety during implantation. Finally, the combinations among micro fabrication techniques with biomedical engineering and nanotechnology represented by flexible MEMS microelectrodes for neural interface will open a new gate to human lives and understanding of the world.

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Controlled activation of iridium film for AIROF microelectrodes

Cited by 21 publications

References 70 publications

Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

Metal Ir coatings on endocardial electrode tips, obtained by MOCVD

Fabrication and electrochemical comparison of SIROF-AIROF-EIROF microelectrodes for neural interfaces

Progress in Research of Flexible MEMS Microelectrodes for Neural Interface

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