Searched for: author:"Vollebregt, S."
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Mirza Gheytaghi, Amir (author), Ghaderi, M. (author), Vollebregt, S. (author), Ahmadi, M. (author), Wolfenbuttel, R.F. (author), Zhang, Kouchi (author)
In this paper, the growth of optimized vertically aligned multi-walled carbon nanotube (VA-MWCNT) forests by LPCVD method for use in a large-area absorber in infrared detectors is presented. The effect of synthesis temperature (500−700 °C) and time (1−10 min) on the optical absorption coefficient in the infrared (2−20 μm) is investigated by...
journal article 2020
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Velea, A. (author), Vollebregt, S. (author), Hosman, T.B. (author), Pak, A. (author), Giagka, Vasiliki (author)
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...
conference paper 2020
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Vasić, Borislav (author), Ralević, Uroš (author), Zobenica, Katarina Cvetanović (author), Smiljanić, Milče M. (author), Gajić, Radoš (author), Spasenović, Marko (author), Vollebregt, S. (author)
Chemical vapour deposition (CVD) is a promising method for producing large-scale graphene (Gr). Nevertheless, microscopic inhomogeneity of Gr grown on traditional metal substrates such as copper or nickel results in a spatial variation of Gr properties due to long wrinkles formed when the metal substrate shrinks during the cooling part of the...
journal article 2020
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Sun, J. (author), Hu, D. (author), Liu, Zewen (author), Middelburg, L.M. (author), Vollebregt, S. (author), Sarro, P.M. (author), Zhang, Kouchi (author)
A micro-scale pressure sensor based on suspended AlGaN/GaN heterostructure is reported with non-linear sensitivity. By sealing the cavity, vacuum sensing at various temperatures was demonstrated. To validate the proposed concept of the AlGaN/GaN vacuum sensor, a 700 µm diameter circular membrane was electrically characterized under applied...
journal article 2020
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Pezone, R. (author), Vollebregt, S. (author), Sarro, P.M. (author), Unnikrishnan, S. (author)
Control of the morphology of carbon nanotubes (CNT) is fundamental for many applications. It is known that the catalyst distributions influence the vertical alignment and the height of the CNT. In this work we investigate the influence of the pre-anneal time and reductant gases, specifically NH<sub>3</sub> and H<sub>2</sub> as well as...
journal article 2020
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Velea, A. (author), Vollebregt, S. (author), Wardhana, G.K. (author), Giagka, Vasiliki (author)
This paper reports on the characterization of a microfabricated wafer-scale, graphene-based, soft implant for spinal cord applications. Graphene is used because of its high transparency and good conductivity, making it suitable for optogenetic applications. Moreover it has a high mechanical strength and is potentially biocompatible. The implant...
conference paper 2020
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Middelburg, L.M. (author), van Zeijl, H.W. (author), Vollebregt, S. (author), Morana, B. (author), Zhang, Kouchi (author)
This work focusses on the design and fabrication of surface micromachined pressure sensors, designed in a modular way for the integration with analog front-end read-out electronics. Polycrystalline 3C silicon carbide (SiC) was used to fabricate free-standing high topography cavities exploiting surface micromaching. The poly-SiC was in-situ...
journal article 2020
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Mo, J. (author), Middelburg, L.M. (author), Morana, B. (author), van Zeijl, H.W. (author), Vollebregt, S. (author), Zhang, Kouchi (author)
The application of pressure sensors in harsh environments is typically hindered by the stability of the material over long periods of time. This work focuses on the design and fabrication of surface micromachined Pirani gauges which are designed to be compatible with state-of-the-art Silicon Carbide CMOS technology. Such an integrated platform...
journal article 2020
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Ricciardella, F. (author), Vollebregt, S. (author), Boshuizen, B. (author), Danzl, F.J.K. (author), Cesar, Ilkay (author), Spinelli, Pierpaolo (author), Sarro, P.M. (author)
Chemical vapour deposition (CVD) has emerged as the dominant technique to combine high quality with large scale production of graphene. The key challenge for CVD graphene remains the transfer of the film from the growth substrate to the target substrate while preserving the quality of the material. Avoiding the transfer process of single or...
journal article 2020
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Mirza Gheytaghi, Amir (author), Poelma, René H. (author), Sacco, L.N. (author), Vollebregt, S. (author), Zhang, Kouchi (author)
In this paper, the compressive stress of pristine and coated vertically-aligned (VA) multi-walled (MW) carbon nanotube (CNT) pillars were investigated using flat-punch nano-indentation. VA-MWCNT pillars of various diameters (30–150 µm) grown by low-pressure chemical vapor deposition on silicon wafer. A conformal brittle coating of niobium...
journal article 2020
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Velea, A. (author), Vollebregt, S. (author), Giagka, Vasiliki (author)
Patients affected by spinal cord injuries (SCI) are usually unable to perform trivial motor activities and thus, for therapeutic purposes, epidural spinal cord stimulation (ESCS) is currently used. Moreover, more exploratory research, using optogenetics, is being conducted in rodents for a better understanding of the mechanisms that occur while...
poster 2020
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Tang, H. (author), Sacco, L.N. (author), Vollebregt, S. (author), Ye, Huaiyu (author), Fan, Xuejun (author), Zhang, Kouchi (author)
2D- and nanostructured metal sulfide materials promise to advance several gas sensing applications due to the abundant choice of materials with easily tunable electronic, optical, physical, and chemical properties. Of these applications, they are particularly attractive for gas sensing in environmental monitoring and breath analysis. This review...
journal article 2020
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Ricciardella, F. (author), Vollebregt, S. (author), Polichetti, Tiziana (author), Sarro, P.M. (author), Duesberg, Georg S. (author)
Humidity sensing is fundamental in some applications, as humidity can be a strong interferent in the detection of analytes under environmental conditions. Ideally, materials sensitive or insensitive towards humidity are strongly needed for the sensors used in the first or second case, respectively. We present here the sensing properties of...
journal article 2020
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Velea, Andrada (author), Vollebregt, S. (author), Giagka, Vasiliki (author)
Our aim is 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 work, we present the microfabrication process for the wafer-level development of such a compact, active, transparent and flexible implant. The transparent...
abstract 2019
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Dolleman, R.J. (author), Hsu, Z. (author), Vollebregt, S. (author), Sader, John E. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author), Ghatkesar, M.K. (author)
Current wafer-scale fabrication methods for graphene-based electronics and sensors involve the transfer of single-layer graphene by a support polymer. This often leaves some polymer residue on the graphene, which can strongly impact its electronic, thermal, and mechanical resonance properties. To assess the cleanliness of graphene fabrication...
journal article 2019
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Romijn, J. (author), Vollebregt, S. (author), van Zeijl, H.W. (author), Sarro, P.M. (author)
In this paper we present, for the first time, the successful monolithic wafer-scale integration of CVD graphene with CMOS logic for highly miniaturized smart sensing structures with on-chip readout electronics. The use of a patterned CMOS compatible catalyst for pre-defined regions of CVD graphene growth, and the transfer-free process used,...
conference paper 2019
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Ricciardella, F. (author), Vollebregt, S. (author), Kurganova, Evgenia (author), Giesbers, A.J.M. (author), Ahmadi, M. (author), Sarro, P.M. (author)
A method to grow multi layers graphene (MLG) just by thermal annealing in an inert atmosphere is reported. A molybdenum (Mo) catalyst layer is used in combination with a solid amorphous carbon (a-C) source on top or below the Mo layer. The formation of MLG directly on top of the catalyst substrate surface is confirmed by Raman spectroscopy,...
journal article 2019
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Ricciardella, F. (author), Polichetti, Tiziana (author), Vollebregt, S. (author), Alfano, Brigida (author), Massera, Ettore (author), Sarro, P.M. (author)
Limitations such as lack of detected stationary signal and slow signal recovery after detection currently affect graphene-based chemi-sensors operating at room temperature. In this work, we model the behavior of a sensor in a test chamber having limited volume and simulating the environmental conditions. From this model, we mathematically derive...
journal article 2019
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Mirza Gheytaghi, Amir (author), Vollebregt, S. (author), Poelma, René H. (author), van Zeijl, H.W. (author), Zhang, Kouchi (author)
poster 2019
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Wardhana, Gandhika K (author), Serdijn, W.A. (author), Vollebregt, S. (author), Giagka, V. (author), Vollebregt, Sten (author)
Neural interface in the form of microelectrodes are used to monitor and treat spinal cord injury and other neurological disorders by the means of recording and stimulation. Despite of the apparent result of these electrical interventions, understanding of the mechanism behind neural stimulation is still inadequate. The use of optical monitoring...
abstract 2019
Searched for: author:"Vollebregt, S."
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