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Stuber, V.L. (author), Mahon, T.R. (author), van der Zwaag, S. (author), Groen, W.A. (author)Polymer-piezoceramic composites have drawn a lot of attention for sensor and energy harvesting applications. Poling such materials can be difficult due to the electric field getting mostly distributed over the low dielectric constant matrix. During this process, the electrical matrix conductivity plays a vital role. This work shows how two...journal article 2019
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Zhao, Dong (author), Lenz, Thomas (author), Gelinck, Gerwin H. (author), Groen, W.A. (author), Damjanovic, Dragan (author), de Leeuw, D.M. (author), Katsouras, Ilias (author)Depolarization in ferroelectric materials has been studied since the 1970s, albeit quasi-statically. The dynamics are described by the empirical Merz law, which gives the polarization switching time as a function of electric field, normalized to the so-called activation field. The Merz law has been used for decades; its origin as domain-wall...journal article 2019
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Deutz, D.B. (author), Pascoe, J.A. (author), Schelen, J.B.J. (author), van der Zwaag, S. (author), de Leeuw, D.M. (author), Groen, W.A. (author)Piezoelectric energy harvesters are at the front of scientific research as enablers of renewable, sustainable energy for autonomous wireless sensor networks. Crucial for this disruptive technology is the achievable output power. Here we show, analytically, that the maximum output energy per unit volume, under a single sinusoidal excitation,...journal article 2018
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Kommeren, Sander (author), Coenen, Michiel J.J. (author), Eggenhuisen, Tamara M. (author), Slaats, Thijs M.W.L. (author), Gorter, Harrie (author), Groen, W.A. (author)A commonly used strategy in the fabrication of organic electronics involves the use of orthogonal solvents, i.e. the alternating use of organic solvents and water for the application of consecutive layers to prevent dissolution of previous layers. This strategy therefore requires the deposition of sequential layers with a large mismatch in...journal article 2018
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Abbel, Robert (author), Galagan, Yulia (author), Groen, W.A. (author)The production of electronic devices using solution based (“wet”) deposition technologies has some decisive technical and commercial advantages compared to competing approaches like vacuum based (“dry”) manufacturing. Particularly, the potential to scale up production processes to large areas and high volumes by introducing continuous roll-to...review 2018
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Katerinopoulou, Dimitra (author), Zalar, Peter (author), Sweelssen, Jorgen (author), Kiriakidis, George (author), Rentrop, Corné (author), Groen, W.A. (author), Gelinck, Gerwin H. (author), van den Brand, Jeroen (author), Smits, Edsger C.P. (author)Surfaces which can accurately distinguish spatial and temporal changes in temperature are critical for not only flow sensors, microbolometers, process control, but also future applications like electronic skins and soft robotics. Realizing such surfaces requires the deposition of thousands of thermal sensors over large areas, a task ideally...journal article 2018
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Galagan, Yulia (author), Di Giacomo, Francesco (author), Gorter, Harrie (author), Kirchner, Gerwin (author), de Vries, Ike (author), Andriessen, Ronn (author), Groen, W.A. (author)The feasibility of upscaling the perovskite solar cells technologies to high volume production using roll-to-roll (R2R) slot die coating is demonstrated in this study. Perovskite solar cells are produced by R2R slot die coating on flexible substrates with a width of 30 cm and the web speed of 3–5 m min−1. R2R deposition of the electron transport...journal article 2018
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Isabelli, Fabiano (author), Di Giacomo, Francesco (author), Gorter, Harrie (author), Brunetti, Francesca (author), Groen, W.A. (author), Andriessen, Ronn (author), Galagan, Yulia (author)Current laboratory-scale fabrication of perovskite solar cells involves the use of toxic solvents in the different fabrication steps. The aim of this research is to find a nontoxic alternative to chlorobenzene used for the deposition of hole transport material (HTM) spiro-OMeTAD. The initial selection of the solvents compatible with...journal article 2018
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Lenz, Thomas (author), Hummel, Regina (author), Katsouras, Ilias (author), Groen, W.A. (author), Nijemeisland, M. (author), Ruemmler, Robert (author), Schäfer, Michael K.E. (author), de Leeuw, D.M. (author)Recently reported piezoresponse force microscopy (PFM) measurements have proposed that porcine aortic walls are ferroelectric. This finding may have great implications for understanding biophysical properties of cardiovascular diseases such as arteriosclerosis. However, the complex anatomical structure of the aortic wall with different...journal article 2017
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Vieira Valente, R.D. (author), De Ruijter, Chris (author), Vlasveld, Daniel (author), van der Zwaag, S. (author), Groen, W.A. (author)Conductive polymer composites have been receiving increased interest both from the scientific community and industry with a special focus on electromagnetic interference (EMI) shielding applications. In this paper, we present the design, EM wave simulation, and validation through S-parameters measurements of an EMI shielding effectiveness (SE...journal article 2017
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Deutz, D.B. (author), Mascarenhas, N.T. (author), van der Zwaag, S. (author), Groen, W.A. (author)Composites of aligned (K,Na,Li)NbO<sub>3</sub> (KNLN) piezoceramic particles in a PDMS polymer matrix are presented as promising materials for flexible sensors and energy harvesters. Their ease of processing is matched with a relatively high damage tolerance and piezoelectric performance at low dielectric loss. To maximize piezoelectric...journal article 2017
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Abbel, Robert (author), de Vries, Ike (author), Langen, Arjan (author), Kirchner, Gerwin (author), t’Mannetje, Hero (author), Gorter, Harrie (author), Wilson, Joanne (author), Groen, W.A. (author)The large volume production of flexible electronics by solution based roll-to-roll (R2R) manufacturing technologies is a promising upscaling strategy for the organic electronics industry. Typical optoelectronic devices like organic light emitting diodes (OLEDs) consist of a complex stack of functional layers. Solution deposition of these...journal article 2017
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Deutz, D.B. (author), Mascarenhas, N.T. (author), Schelen, J.B.J. (author), de Leeuw, D.M. (author), van der Zwaag, S. (author), Groen, W.A. (author)A highly sensitive, lead-free, and flexible piezoelectric touch sensor is reported based on composite films of alkaline niobate K<sub>0.485</sub>Na<sub>0.485</sub>Li<sub>0.03</sub>NbO<sub>3</sub> (KNLN) powders aligned in a polydimethylsiloxane (PDMS) matrix. KNLN powder is fabricated by solid-state sintering and consists of microcubes. The...journal article 2017
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Khanbareh, H. (author), van der Zwaag, S. (author), Groen, W.A. (author)Composites of lead zirconate titanate particles in an epoxy matrix are prepared in the form of 0–3 and quasi 1–3 with different ceramic volume contents from 10% to 50%. Two different processing routes are tested. Firstly a conventional dielectrophoretic structuring is used to induce a chain-like particle configuration, followed by curing the...journal article 2017
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Shaji Karapuzha, A. (author), Kunnamkuzhakkal James, N. (author), Khanbareh, H. (author), van der Zwaag, S. (author), Groen, W.A. (author)The effects of Zr/Ti ratio on the dielectric and piezoelectric properties of the sintered Pb(Zr<sub>x</sub>Ti<sub>(1−x)</sub>)<sub>0.99</sub>Nb<sub>0.01</sub>O<sub>3</sub> piezoelectric ceramics across the entire range of phase diagram of the PZT solid solution was studied systematically. The materials were prepared by the conventional mixed...journal article 2016
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Shaji Karapuzha, A. (author), Kunnamkuzhakkal James, N. (author), van der Zwaag, S. (author), Groen, W.A. (author)Modern flexible and sensitive sensors based on polymer–ceramic composites employ lead zirconate titanate (PZT) granulates having the morphotropic phase boundary (MPB) composition as the piezo active ingredient, as this composition gives the best properties in fully ceramic piezoelectric sensors. In this study, the possibility of using PZT...journal article 2016
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Lenz, T. (author), Dehsari, H.S. (author), Asadi, Kamal (author), Blom, PWM (author), Groen, W.A. (author), de Leeuw, D.M. (author)We demonstrate that ferroelectric memory diodes can be utilized as switching type positive temperature coefficient (PTC) thermistors. The diode consists of a phase separated blend of a ferroelectric and a semiconducting polymer stacked between two electrodes. The current through the semiconducting polymer depends on the ferroelectric...journal article 2016
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Zhao, D (author), Asadi, Kamal (author), Groen, W.A. (author), Blom, PWM (author), de Leeuw, D.M. (author)A homogeneous ferroelectric single crystal exhibits only two remanent polarization states that are stable over time, whereas intermediate, or unsaturated, polarization states are thermodynamically instable. Commonly used ferroelectric materials however, are inhomogeneous polycrystalline thin films or ceramics. To investigate the stability of...journal article 2016
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Deutz, D.B. (author), Mascarenhas, N.T. (author), van der Zwaag, S. (author), Groen, W.A. (author)In this study, the influence of Li substitution on the piezoelectric performance of lead-free K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> (KNN)-epoxy composites is explored. KNN piezoceramic particles modified with 0-12 mol% of Li are prepared via a double calcination technique, resulting in a perovskite particulate which transitions from...journal article 2016
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Khanbareh, H. (author), Schelen, J.B.J. (author), Van der Zwaag, S. (author), Groen, W.A. (author)Pyroelectric properties of materials can be accurately determined by applying a new digital signal processing method on the discrete sampled data obtained with a temperature oscillation technique. The pyroelectric coefficient is calculated from the component of the generated current 90? out of phase with respect to the sinusoidal temperature...journal article 2015