Publications by Junrui Zhang | EPFL Graph Search

Sensitivity, Noise and Resolution in a B -Modified Foundry-Made ISFET with Miniaturized Reference Electrode for Wearable Point-of-Care Applications

Mihai Adrian Ionescu, Luca Selmi, Junrui Zhang, Francesco Bellando, Pierpaolo Palestri

Ion-sensitive field-effect transistors (ISFETs) form a high sensitivity and scalable class of sensors, compatible with advanced complementary metal-oxide semiconductor (CMOS) processes. Despite many previous demonstrations about their merits as low-power i ...

2021

Wearable systems for measuring sweat rate and methods of using the same

Fabien Patrick Wildhaber, Hoël Maxime Guérin, Junrui Zhang

Presented herein are systems and methods for measuring sweat rate of a subject using a wearable system. A sweat rate may be determined automatically based on one or more signals produced by a wetting sensor module in response to a presence of sweat in the ...

2021

Extended gate field-effect-transistor for sensing cortisol stress hormone

Mihai Adrian Ionescu, Hoël Maxime Guérin, Junrui Zhang, Luca Capua, Sadegh Kamaei Bahmaei, Sayedeh Shirin Afyouni Akbari, Shokoofeh Sheibani

Cortisol is a hormone released in response to stress and is a major glucocorticoid produced by adrenal glands. Here, we report a wearable sensory electronic chip using label-free detection, based on a platinum/graphene aptamer extended gate field effect tr ...

SPRINGERNATURE2021

Monolithically Integrated Catalyst-Free High Aspect Ratio InAs-on-Insulator (InAsOI) FinFETs for pH Sensing

Mihai Adrian Ionescu, Fabien Patrick Wildhaber, Maneesha Rupakula, Junrui Zhang, Francesco Bellando, Clarissa Convertino

In this work, we report a novel Indium Arsenide-on-insulator (InAsOI) FinFET platform designed with record high aspect ratio that favors the use of the devices as charge sensors. InAs has very high mobility among III-V semiconductors and an intrinsic surfa ...

2020

A Novel Reconfigurable CMOS Compatible Ka Band Bandstop Structure Using Split-Ring Resonators and Vanadium Dioxide (VO2) Phase Change Switches

Mihai Adrian Ionescu, Andreas Schueler, Emanuele Andrea Casu, Junrui Zhang, Anna Krammer, Riyaz Mohammed Abdul Khadar, Andrei Müller

The article presents the design, fabrication and characterization of a novel complementary metal-oxidesemiconductor (CMOS) compatible reconfigurable Ka band bandstop structure using split ring resonators (SRR) while employing the Vanadium Dioxide (VO2) pha ...

IEEE2019

Monolithically integrated catalyst-free High Aspect Ratio InAs-On-Insulator (InAsOI) FinFETs for pH sensing

Mihai Adrian Ionescu, Kirsten Emilie Moselund, Fabien Patrick Wildhaber, Maneesha Rupakula, Junrui Zhang, Francesco Bellando, Clarissa Convertino

In this work, we report a novel Indium Arsenide-on-insulator (InAsOI) FinFET platform designed with record high aspect ratio that favor the use of the devices as charge sensors. InAs has very high mobility among III-V semiconductors and an intrinsic surfac ...

IEEE2019

Sweat Biomarker Sensor Incorporating Picowatt, Three-Dimensional Extended Metal Gate Ion Sensitive Field Effect Transistors

Mihai Adrian Ionescu, Fabien Patrick Wildhaber, Hoël Maxime Guérin, Maneesha Rupakula, Erick Antonio Garcia Cordero, Junrui Zhang, Francesco Bellando, Guillaume Charles Henri Herment

Ion sensitive field effect transistors (ISFETs) form a very attractive solution for wearable sensors due to their capacity for ultra-miniaturization, low power operation, and very high sensitivity, supported by complementary metal oxide semiconductor (CMOS ...

2019

3D Smith charts scattering parameters frequency-dependent orientation analysis and complex-scalar multi-parameter characterization applied to Peano reconfigurable vanadium dioxide inductors

Mihai Adrian Ionescu, Andreas Schueler, Josef Andreas Schuler, Montserrat Fernandez-Bolanos Badia, Emanuele Andrea Casu, Junrui Zhang, Anna Krammer, Matteo Cavalieri, Andrei Müller

Recently, the field of Metal-Insulator-Transition (MIT) materials has emerged as an unconventional solution for novel energy efficient electronic functions, such as steep slope subthermionic switches, neuromorphic hardware, reconfigurable radiofrequency fu ...

Nature Research2019

Field-effect transistor device or sensor for sensing ions, molecules or biomarkers in a fluid

Mihai Adrian Ionescu, Erick Antonio Garcia Cordero, Junrui Zhang, Francesco Bellando

The present disclosure concerns a Field-Effect Transistor device or sensor comprising at least one drain region, at least one source region, at least a channel region, at least a first gate connected to the channel region, at least one stack comprising at ...

2019

Wearable System for Real-Time Sensing of Biomarkers in Human Sweat

Junrui Zhang

Wearable sweat sensing systems offer non-invasive and real-time bio-data streaming solutions. They open the possibility for continuous monitoring of biomarkers' concentrations as well as their variation in sweat, which is a complementary to current passive ...

EPFL2019

All CMOS Integrated 3D-Extended Metal Gate ISFETs for pH and Multi-Ion (Na+, K+, Ca2+) sensing

Mihai Adrian Ionescu, Fabien Patrick Wildhaber, Johan Frédéric Longo, Hoël Maxime Guérin, Maneesha Rupakula, Erick Antonio Garcia Cordero, Junrui Zhang, Francesco Bellando, Guillaume Charles Henri Herment

This paper reports for the first time, smart 3D-Extended-Metal-Gate Ion-Sensitive-Field-Effect-Transistors (3D-EMG-ISFETs), with unique figures of merit: (i) extremely-low-power (down to a record value of 2 pW per sensor under excellent linearity), (ii) al ...

IEEE2018

CMOS 3D-Extended Metal Gate ISFETs with Near Nernstian Ion Sensitivity

Mihai Adrian Ionescu, Fabien Patrick Wildhaber, Johan Frédéric Longo, Hoël Maxime Guérin, Maneesha Rupakula, Erick Antonio Garcia Cordero, Junrui Zhang, Francesco Bellando, Neil Ebejer

IEEE2018

Three-Dimensional Integrated Ultra-Low-Volume Passive Microfluidics with Ion-Sensitive Field-Effect Transistors for Multiparameter Wearable Sweat Analyzers

Mihai Adrian Ionescu, Fabien Patrick Wildhaber, Johan Frédéric Longo, Hoël Maxime Guérin, Erick Antonio Garcia Cordero, Junrui Zhang, Francesco Bellando

Wearable systems could offer noninvasive and real-time solutions for monitoring of biomarkers in human sweat as an alternative to blood testing. Recent studies have demonstrated that the concentration of certain biomarkers in sweat can be directly correlat ...

2018

Low-energy biomarker detection through charge-based impedance measurements

Mihai Adrian Ionescu, Marco Mazza, Junrui Zhang

A novel approach for the detection of biomarkers in aqueous condition via differential impedance is presented. The binding of biomarkers onto functionalized inter-digital electrodes induces a change in the sensor impedance, both in its real and imaginary c ...

2016