Department of Microelectronics
Faculty of Electrical Engineering, Mathematics, and Computer Science

Tim Hosman

Publications

  1. Dielectric spectroscopy for non-invasive sensing of multi-layered organ-on-chip devices
    T. Hosman; M. Spirito; M. Mastrangeli;
    In XXXV Eurosensors Conference,
    10-13 September 2023.

  2. A Low-Power Reconfigurable Transceiver ASIC for a CMUT-based Wearable Ultrasound Patch
    Mingliang Tan; Tim Hosman; Jae-Sung An; Zu-Yao Chang; Michiel Pertijs;
    In Annual Workshop on Circuits, Systems and Signal Processing (ProRISC),
    July 2021.

  3. Towards a flexible brain implant with 10.000 independent channels
    T. B. Hosman; W. Serdijn; and V. Giagka;
    In Book of Abstracts, SAFE 2019,
    Delft, the Netherlands, July 4-5 2019.
    document

  4. Towards a Microfabricated Flexible Graphene-Based Active Implant for Tissue Monitoring During Optogenetic Spinal Cord Stimulation
    A.I. Velea; S. Vollebregt; T. Hosman; A. Pak; V. Giagka;
    In Proceedings IEEE Nanotechnology Materials and Devices Conference (NMDC) 2019,
    Stockholm, Sweden, Oct. 2019.
    Abstract: ... This work aims to develop a smart neural interface with transparent electrodes to allow for electrical monitoring of the site of interest during optogenetic stimulation of the spinal cord. In this paper, a microfabrication process for the wafer-level development of such a compact, active, transparent and flexible implant is presented. Graphene has been employed to form the transparent array of electrodes and tracks, on top of which chips have been bonded using flip-chip bonding techniques. To provide high flexibility, soft encapsulation, using polydimethylsiloxane (PDMS) has been used. Making use of the "Flex-to-Rigid" (F2R) technique, cm-size graphene-on-PDMS structures have been suspended and characterized using Raman spectroscopy to qualitatively evaluate the graphene layer, together with 2-point measurements to ensure the conductivity of the structure. In parallel, flip-chip bonding processes of chips on graphene structures were employed and the 2-point electrical measurement results have shown resistance values in the range of kΩ for the combined tracks and ball-bonds.

    document

  5. Towards a Microfabricated Flexible Graphene-Based Active Implant for Tissue Monitoring During Optogenetic Spinal Cord Stimulation
    Andrada Iulia Velea; Sten Vollebregt; Tim Hosman; Anna Pak; Vasiliki Giagka;
    In Proc. IEEE NMDC,
    2019.

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