Searched for: author:"Zhang, G.Q."
(1 - 20 of 41)

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Ramachandrappa Venkatesh, M. (author), Sachdeva, S. (author), El Mansouri, B. (author), Wei, J. (author), Bossche, A. (author), Bosma, D. (author), de Smet, L.C.P.M. (author), Sudholter, E.J.R. (author), Zhang, G.Q. (author)
Capacitors made of interdigitated electrodes (IDEs) as a transducer platform for the sensing of volatile organic compounds (VOCs) have advantages due to their lower power operation and fabrication using standard micro-fabrication techniques. Integrating a micro-electromechanical system (MEMS), such as a microhotplate with IDE capacitor,...
journal article 2019
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Middelburg, L.M. (author), el Mansouri, B. (author), Poelma, R.H. (author), Zhang, G.Q. (author), van Zeijl, H.W. (author), Wei, J. (author)
This work describes the design, modelling and realisation of the mechanical part of a non-linear MEMS accelerometer intended for large displacement behaviour. For this, a mass/spring system was designed with an extremely low resonance frequency. In this work the mechanical behaviour was verified by measurements done using an optical setup,...
conference paper 2018
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Sokolovskij, R. (author), Zhang, J. (author), Jiang, Yang (author), Chen, Ganhui (author), Zhang, G.Q. (author), Yu, Hongyu (author)
Wide bandgap gallium nitride material has highly favorable electronic properties for next generation power and high frequency electronic devices. A less widely studied application is highly miniaturized chemical and gas sensors capable of operating in harsh environment conditions. In this work we present our recent developments on design,...
conference paper 2018
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Yazdan Mehr, M. (author), van Driel, W.D. (author), De Buyl, Francois (author), Zhang, G.Q. (author)
Degradation mechanisms of silicone plates under harsh environment conditions are studied in this investigation. Environmental degradation of silicone free form, used as secondary optics in Light Emitting Diode LED lighting lamps and luminaires or any other applications requiring high quality optics being used, has negative implications for the...
journal article 2018
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Huang, Z.Q. (author), Poelma, R.H. (author), Vollebregt, S. (author), Koelink, M.H. (author), Boschman, E. (author), Kropf, R. (author), Gallouch, M. (author), Zhang, G.Q. (author)
This article shows the fabrication process and packaging of through polymer optical vias (TPOV). The TPOV enables encapsulation and packaging of silicon photonic systems using film assisted molding (FAM) and the creation of micron-sized through polymer optical vias. The optical vias are lithographically defined in thick film photo-resist (∼ 300...
conference paper 2018
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Middelburg, L.M. (author), el Mansouri, B. (author), Poelma, R.H. (author), van Zeijl, H.W. (author), Wei, J. (author), Zhang, G.Q. (author), van Driel, W.D. (author)
The mechanical part of inertial sensors can be designed to have a large mechanical sensitivity, but also requires the transduction mechanism which translates this displacement. The overall system resolution in mechanical inertial sensors is dictated by the noise contribution of each stage and the magnitude of each sensitivity, see also Figure...
conference paper 2018
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Koladouz Esfahani, Z. (author), Tohidian, M. (author), van Zeijl, H.W. (author), Kolahdouz, Mohammadreza (author), Zhang, G.Q. (author)
Given the performance decay of high-power light-emitting diode (LED) chips over time and package condition changes, having a reliable output light for sensitive applications is a point of concern. In this study, a light feedback control circuit, including blue-selective photodiodes, for blue/ultraviolet (UV) LED, has been designed and...
journal article 2017
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Chen, Liangbiao (author), Zhou, Jiang (author), Chu, Hsing-wei (author), Zhang, G.Q. (author), Fan, Xuejun (author)
While moisture diffusion in microelectronic device and packaging has been studied for decades, the problems involving complex nonlinear moisture diffusion in multi-material assembly have not been fully studied. This paper has developed a general nonlinear diffusion model by adopting water activity, a continuous state variable, as the field...
journal article 2017
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Middelburg, L.M. (author), el Mansouri, B. (author), van Zeijl, H.W. (author), Zhang, G.Q. (author), Poelma, R.H. (author)
In this work a method is described to investigate process variations across a wafer. Through wafer MEMS spiral resonators were designed, simulated, fabricated and characterized by measuring the eigenfrequency and corresponding mode shapes. Measuring the eigenfrequency and resulting spectral behavior of resonators on different locations on the...
conference paper 2017
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Dong, J. (author), Zhang, G.Q. (author)
In lighting systems consisting light-emitting diodes (LEDs), excessive temperature is a main cause of degraded luminous efficacy, which leads to reduced average illuminance and distorted illumination rendering. Modeling the thermal dynamics of LEDs is hence essential in designing thermal dissipators and controllers for maintaining constant...
journal article 2017
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Li, X. (author), Wei, L. (author), Poelma, R.H. (author), Vollebregt, S. (author), Wei, J. (author), Urbach, H.P. (author), Sarro, P.M. (author), Zhang, G.Q. (author)
This paper presents a tuneable binary amplitude Fresnel lens produced by wafer-level microfabrication. The Fresnel lens is fabricated by encapsulating lithographically defined vertically aligned carbon nanotube (CNT) bundles inside a polydimethyl-siloxane (PDMS) layer. The composite lens material combines the excellent optical absorption...
journal article 2016
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Silvestri, C. (author), Riccio, M. (author), Poelma, R.H. (author), Morana, B. (author), Vollebregt, S. (author), Santagata, F. (author), Irace, A. (author), Zhang, G.Q. (author), Sarro, P.M. (author)
Thermal material properties play a fundamental role in the thermal management of microelectronic systems. The porous nature of carbon nanotube (CNT) arrays results in a very high surface area to volume ratio, which makes the material attractive for surface driven heat transfer mechanisms. Here, we report on the heat transfer performance of...
journal article 2016
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Ye, H. (author), Leung, Stanley Y.Y. (author), Wong, K.Y. (author), Chen, Xianping (author), Lin, Kai (author), Fan, J. (author), Kjelstrup, Signe (author), Fan, Xuejun (author), Zhang, G.Q. (author)
Using the analogue of the electric inductance, we reveal the properties of the thermal inductance in GaN-based light-emitting diode devices by testing their transient thermal behaviors. We find that the devices exhibit a transient thermal response under step-down or step-up currents and observe notable inductive phenomena of the temperature...
journal article 2016
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Zhang, B. (author), Carisey, Y.C.P. (author), Damian, A. (author), Poelma, R.H. (author), Zhang, G.Q. (author), van Zeijl, H.W. (author)
We explore a methodology for patterned copper nanoparticle paste for 3D interconnect applications in wafer to wafer (W2W) bonding. A novel fine pitch thermal compression bonding process (sintering) with coated copper nanoparticle paste was developed. Most of the particle size is between 10-30 nm. Lithographically defined stencil printing using...
conference paper 2016
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Yazdan Mehr, M. (author), Van Driel, W.D. (author), Zhang, G.Q. (author)
A methodology, based on accelerated degradation testing, is developed to predict the lifetime of remote phosphor plates used in solid-state lighting (SSL) applications. Both thermal stress and light intensity are used to accelerate degradation reaction in remote phosphor plates. A reliability model, based on the Eyring relationship, is also...
journal article 2015
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Soleimanzadeh, R. (author), Kolahdouz, M. (author), Charsooghi, M.A. (author), Kolahdouz Esfahani, Z. (author), Zhang, G.Q. (author)
An ultra-violet (UV) phototransistor with 700x200 lm2 gate area decorated with vertically aligned Zinc Oxide (ZnO) nanorods to enhance UV responsivity is designed and manufactured. Spectral responsivity of the device was measured for wavelengths ranged from 200 to 1100 nm of the electromagnetic spectrum in different transistor working regions....
journal article 2015
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van Driel, W.D. (author), Yazdan Mehr, M. (author), Zhang, G.Q. (author)
Solid State Lighting (SSL) technologies and products are gradually pervading into our daily life. An SSL system is composed of a LED engine with a micro-electronics driver(s), integrated in a housing that also provides the optical, sensing and other functions. Knowledge of (system) reliability is crucial for not only the business success of the...
conference paper 2014
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Poelma, R.H. (author), Morana, B. (author), Vollebregt, S. (author), Schlangen, H.E.J.G. (author), Van Zeijl, H.W. (author), Fan, X. (author), Zhang, G.Q. (author)
The porous nature of carbon nanotube (CNT) arrays allows for the unique opportunity to tailor their mechanical response by the infiltration and deposition of nanoscale conformal coatings. Here, we fabricate novel photo-lithographically defined CNT pillars that are conformally coated with amorphous silicon carbide (a-SiC) to strengthen the...
journal article 2014
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Wei, J. (author), Ye, H. (author), Van Zeijl, H.W. (author), Sarro, P.M. (author), Zhang, G.Q. (author)
A micro-electro-mechanical-system (MEMS) based, temperature triggered, switch is developed as a cost-effective solution for smart cooling control of solid-state-lighting systems. The switch (1.0x0.4 mm2) is embedded in a silicon substrate and fabricated with a single-mask 3D micro-machining process. The device switches on at a designed...
journal article 2012
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Chen, X.P. (author), Wong, C.K.Y. (author), Yuan, C.A. (author), Zhang, G.Q. (author)
We report a molecular modeling study to evaluate and select conducting polymers (CPs) as the sensing materials of carbon dioxide (CO2) sensor. The interaction between polymer and gas and the adsorption of the gas molecules in the polymer matrix are investigated. Polymers considered for this work include emeraldine base polyaniline (EB–PANI) and...
journal article 2011
Searched for: author:"Zhang, G.Q."
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