A. Bongrain - Academia.edu (original) (raw)

Papers by A. Bongrain

Procedia Engineering, 2015

Extra cellular electrical recording of the central nervous system has been used for decades by el... more Extra cellular electrical recording of the central nervous system has been used for decades by electro-physiologists to explore fundamental properties of neural networks. Thanks to the evolution of micro-technology, it is now possible to develop a new kind of Micro Electrode Array (MEA) that can be used for in vitro and in vivo applications, both to record and stimulate neuronal

2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), 2013

ABSTRACT We report on a new approach involving the use of Boron Doped Diamond (B-NCD) to fabricat... more ABSTRACT We report on a new approach involving the use of Boron Doped Diamond (B-NCD) to fabricate Micro Electrode Arrays (MEAs). MEAs are common electrophysiology tools enabling to probe the neuronal activity distributed over large populations of neurons or from embryonic organs [1-3]. They allow recording neuronal network activities while delivering specific electrical stimulations. Specific MEAs can also be used to build neural prosthesis or implants in order to compensate for function losses due to lesions or degeneration of part of the Central Nervous System (CNS). Here the main advantage of diamond is its wide electrochemical window in aqueous electrolytes as well as its bio-inertness.

Sensors, 2012

We report on the fabrication and characterization of an 8 × 8 multichannel Boron Doped Diamond (B... more We report on the fabrication and characterization of an 8 × 8 multichannel Boron Doped Diamond (BDD) ultramicro-electrode array (UMEA). The device combines both the assets of microelectrodes, resulting from conditions in mass transport from the bulk solution toward the electrode, and of BDD's remarkable intrinsic electrochemical properties. The UMEAs were fabricated using an original approach relying on the selective growth of diamond over pre-processed 4 inches silicon substrates. The prepared UMEAs were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results demonstrated that the electrodes have exhibited a very fast electrode transfer rate (k 0 ) up to 0.05 cm•s −1 (in a fast redox couple) and on average, a steady state limiting current (in a 0.5 M potassium chloride aqueous solution containing OPEN ACCESS Sensors 2012, 12 7670 1 mM Fe(CN) 6 4− ion at 100 mV•s −1 ) of 1.8 nA. The UMEAs are targeted for electrophysiological as well as analytical applications.

physica status solidi (a), 2010

ABSTRACT

Journal of Micromechanics and Microengineering, 2009

We present a new and original approach for the fabrication of diamond MEMS using MPCVD. This proc... more We present a new and original approach for the fabrication of diamond MEMS using MPCVD. This process does not rely on diamond etching using conventional techniques such as e.g. RIE: here our MEMS structures are geometrically defined using silicon moulds in which diamond is grown selectively. The moulds can be prepared from silicon using DRIE and enabling a wide range of geometries. The critical point is the selectivity of diamond growth which dramatically depends on the nucleation process. Two nucleation methods for selective diamond growth inside silicon moulds were explored in parallel and compared, namely, the bias enhanced nucleation (BEN) and the nano-seeding technique. With both methods, MEMS structures were successfully fabricated and characterized, leading to values for the Young modulus above 830 GPa, thus comparing well with literature values. We believe our approach will ease the routine fabrication of large area diamond MEMS wafers for improved advanced device fabrication.

IRBM, 2011

Other uses, including reproduction and distribution, or selling or licensing copies, or posting t... more Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright Author's personal copy IRBM 32 (2011) 91-94 Brief communication 3D shaped mechanically flexible diamond microelectrode arrays for eye implant applications: The MEDINAS project Matrices d'électrodes en diamant pour l'interfaçage neuronal appliqué à la suppléance fonctionnelle (MEDINAS)

ABSTRACT Microelectrode arrays (MEAs) are extracellular devices allowing both recording and elect... more ABSTRACT Microelectrode arrays (MEAs) are extracellular devices allowing both recording and electrical stimulation of neuronal or cardiac cells. Interfacing cellular networks with MEAs leads to a better knowledge and understanding of the mechanisms of biological tissue and can be used for restorative purposes using neural prosthesis. We report the fabrication of in vitro 8×8 and 4×15 planar boron-doped nanocrystalline diamond (BNCD) MEAs using microtechnology. The BNCD for our MEA electrodes have been characterized electrochemically and we show that these devices offer good recording properties as compared to other standard electrode materials (such as Ti-Pt or Au).

Procedia Engineering, 2015

Extra cellular electrical recording of the central nervous system has been used for decades by el... more Extra cellular electrical recording of the central nervous system has been used for decades by electro-physiologists to explore fundamental properties of neural networks. Thanks to the evolution of micro-technology, it is now possible to develop a new kind of Micro Electrode Array (MEA) that can be used for in vitro and in vivo applications, both to record and stimulate neuronal

2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), 2013

ABSTRACT We report on a new approach involving the use of Boron Doped Diamond (B-NCD) to fabricat... more ABSTRACT We report on a new approach involving the use of Boron Doped Diamond (B-NCD) to fabricate Micro Electrode Arrays (MEAs). MEAs are common electrophysiology tools enabling to probe the neuronal activity distributed over large populations of neurons or from embryonic organs [1-3]. They allow recording neuronal network activities while delivering specific electrical stimulations. Specific MEAs can also be used to build neural prosthesis or implants in order to compensate for function losses due to lesions or degeneration of part of the Central Nervous System (CNS). Here the main advantage of diamond is its wide electrochemical window in aqueous electrolytes as well as its bio-inertness.

Sensors, 2012

We report on the fabrication and characterization of an 8 × 8 multichannel Boron Doped Diamond (B... more We report on the fabrication and characterization of an 8 × 8 multichannel Boron Doped Diamond (BDD) ultramicro-electrode array (UMEA). The device combines both the assets of microelectrodes, resulting from conditions in mass transport from the bulk solution toward the electrode, and of BDD's remarkable intrinsic electrochemical properties. The UMEAs were fabricated using an original approach relying on the selective growth of diamond over pre-processed 4 inches silicon substrates. The prepared UMEAs were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results demonstrated that the electrodes have exhibited a very fast electrode transfer rate (k 0 ) up to 0.05 cm•s −1 (in a fast redox couple) and on average, a steady state limiting current (in a 0.5 M potassium chloride aqueous solution containing OPEN ACCESS Sensors 2012, 12 7670 1 mM Fe(CN) 6 4− ion at 100 mV•s −1 ) of 1.8 nA. The UMEAs are targeted for electrophysiological as well as analytical applications.

physica status solidi (a), 2010

ABSTRACT

Journal of Micromechanics and Microengineering, 2009

We present a new and original approach for the fabrication of diamond MEMS using MPCVD. This proc... more We present a new and original approach for the fabrication of diamond MEMS using MPCVD. This process does not rely on diamond etching using conventional techniques such as e.g. RIE: here our MEMS structures are geometrically defined using silicon moulds in which diamond is grown selectively. The moulds can be prepared from silicon using DRIE and enabling a wide range of geometries. The critical point is the selectivity of diamond growth which dramatically depends on the nucleation process. Two nucleation methods for selective diamond growth inside silicon moulds were explored in parallel and compared, namely, the bias enhanced nucleation (BEN) and the nano-seeding technique. With both methods, MEMS structures were successfully fabricated and characterized, leading to values for the Young modulus above 830 GPa, thus comparing well with literature values. We believe our approach will ease the routine fabrication of large area diamond MEMS wafers for improved advanced device fabrication.

IRBM, 2011

Other uses, including reproduction and distribution, or selling or licensing copies, or posting t... more Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright Author's personal copy IRBM 32 (2011) 91-94 Brief communication 3D shaped mechanically flexible diamond microelectrode arrays for eye implant applications: The MEDINAS project Matrices d'électrodes en diamant pour l'interfaçage neuronal appliqué à la suppléance fonctionnelle (MEDINAS)

ABSTRACT Microelectrode arrays (MEAs) are extracellular devices allowing both recording and elect... more ABSTRACT Microelectrode arrays (MEAs) are extracellular devices allowing both recording and electrical stimulation of neuronal or cardiac cells. Interfacing cellular networks with MEAs leads to a better knowledge and understanding of the mechanisms of biological tissue and can be used for restorative purposes using neural prosthesis. We report the fabrication of in vitro 8×8 and 4×15 planar boron-doped nanocrystalline diamond (BNCD) MEAs using microtechnology. The BNCD for our MEA electrodes have been characterized electrochemically and we show that these devices offer good recording properties as compared to other standard electrode materials (such as Ti-Pt or Au).