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This work reports the patterning of high aspect aluminum doped zinc oxide (AZO) for nanowall hollows and capacitive resonators by deep reactive ion etching (deep RIE) and atomic layer deposition (ALD). Nanowall hollows with 50 nm in thickness and 15 μm in height as well as smooth surfaces have been achieved and the aspect ratio of their height-to-width is as high as 300. Suspended AZO capacitive resonators...
In this paper, we firstly report an AlN thin film two-dimensional acoustic wave humidity sensor with graphene oxide (GO) as sensing layer. The sensor with small sensing area show high sensitivity up to 218.6 kHz/10%RH with a wide detection range from 10% to 90%RH. The sensor has excellent performance in terms of repeatability and stability. Little hysteresis, fast response and short recovery time...
This paper reports on a novel sensing interface using composites of graphene foam-titanium nitride nanofibers integrated into a microfluidic sensor for measurement of soil nitrate ions. An in-situ microfabrication approach, based on liquid phase polymerization process, is developed to enable integration of the porous composite into microfluidic channels. This sensor provides an ultralow limit-of-detection...
In this paper, we propose a two electrodes configuration for noncontact long-term cardiac monitoring. Our system was designed as an alternative to Holter devices. Unlike a traditional long-term monitoring equipment, our system is stationary and non-contact, the cardiac signal is acquired through a capacitive coupling between the sensor and the subject's body. The proposed system is the first prototype...
This paper reports a novel electrochemical accelerometer for applications of wearable systems and smart skins. An original flexible accelerometer based on graphene electrodes and a PDMS microchannel on polyimide flexible print circuit (FPC) has been achieved by low-cost fabrication process. Instead of expensive platinum electrodes, a graphene layer was transferred to FPC to function as chemical inertness...
We developed a novel approach to fabricate suspended metal- and metal oxide nanowires using carbon nanotubes (CNTs) as sacrificial template. As a potential application that harnesses the unique properties of suspended nanowires, sensitive chemical sensors were demonstrated. The suspended CNTs template was synthesized on the side wall of the electrodes by chemical vapor deposition (CVD), followed by...
In the area of biomedical engineering, digital-microfluidic biochips (DMFBs) have received considerable attention, because of their capability of providing an efficient and reliable platform for conducting point-of-care clinical diagnostics. System reliability, in turn, mandates error-recoverability while implementing biochemical assays on-chip for medical applications. Unfortunately, the technology...
There are many types of liquid level measurement instrumentations in modern technology, including the multiple-liquid level measurement. However, there are some practical considerations that make them unfit to use in car washer tanks. They are often too expensive, too cumbersome, too awkward and unsuitable in tanks. Only a few of them are suitable enough for the technology to widely benefit their...
Touch screens are a common human interface for smartphones, tablet PCs, and other electronics. Most touch screens detect the contact position of a finger. We proposed a proximity touch screen that uses separation-type electrodes with mutual capacitance measurement to improve functionality. In this paper, we describe a prototype proposed proximity touch screen using indium tin oxide (ITO) electrodes...
Sit-to-stand (STS) failures represent one type of fall accidents caused by loss of balance on senior citizens when they are trying to make body movement from sitting to standing. For effective detection of STS failures, a wearable STS detection system was proposed and developed in this study, based on the combination of the angle change data collected from people's upper trunk and the electromyography...
AT-cut Quartz crystal Microbalance (QCM) has been used as a high precision sensor for decades, which could detect the trace mass deposited on the crystal surface. The accuracy of QCM can be achieved ng level. When used as biosensor in liquid, the resonant frequency is not only affected by the mass change, but also by the liquid density and viscosity, which are greatly dependent on the liquid temperature...
In this work we present a system designed for continuous assessment of tumor cell extracellular pH using a fabricated quartz extended-gate ion-sensitive field effect transistor (EGFET). The extended gate structure was fabricated by patterning gold on a quartz substrate creating a pseudo-reference electrode and sensor below a Si3N4 sensing membrane. Various electrode geometries and configurations were...
Cardiac arrhythmia detection and classification is of outmost importance for early diagnosis to reduce significantly the rates of morbidity and mortality of patients with heart disease. In particular for patients with silent cardiac symptomatology, the advances in wearable sensing technology offer a promising solution for on-line, real-time detection of intermittent tachyarrhythmia events that otherwise...
This paper presents a label-free and non-invasive technique for selective detection of C-terminal telopeptide type I collagen (CTx-I) by employing Electrochemical Impedance Spectroscopy to measure sample impedance. Molecular imprinted polymer, containing artificial recognition sites for CTx-was prepared by precipitation polymerization using CTx-I peptide as a template, methacrylic acid as a functional...
The manipulation and detection of living cells are essential requirements for many applications in biology, biotecnology and medicine. In this study, we propose a microfluidic device, which facilitated of a differential capacitively coupled contactless conductively detection (DC4D) coplanar capacitor structure and a dielectrophoresis (DEP) concentrator based on circular electrodes for detecting of...
The performance of electrical resistance tomography (ERT) system is usually investigated by numerical simulation or static tests using some simple phantoms. The objective of this paper is to construct a coupling simulation model for ERT. In this model, the distribution information of multi-phase flow is exchanged between the fluid field and electric field. The measured voltages from the electrodes...
The IMB-CNM (Barcelona) has developed a new vertical JFET (V-JFET) technology with the purpose of working as rad-hard switches in the HV powering scheme of the upgraded ATLAS tracker. The design of the new transistors draws upon a deep-trenched 3D technology to achieve vertical conduction and low switch-off voltage. These features prospect suitable radiation hardness for the application. The first...
Electrocardiogram (ECG) signals provide vital information about heart activity and diagnostics. Here, a dry ECG electrode based on reduced Graphene Oxide (rGOx) coated fabrics is presented. Graphene Oxide (GOx) affinity towards recoating of already coated GOx fabrics is relied upon to reduce fabric resistance. The facile fabrication process is presented with an emphasis on GOx recoating. Two nylon...
Metal oxide based thin film transistors (TFT) have shown strong improvement of their electric characteristics with n-type devices being gradually introduced commercially in display technology. Following on this success path, potential applications of such TFTs to Internet of Things (IoT) chemical sensing enablement are discussed, with a focus on the effect of polyols on molybdenum doped indium oxide...
The electronic tongue (ET) system is basically a multi-electrode system where the response of each electrode in presence of tea samples are multi dimensional combinations of different chemical compounds and represented by large number of measured points. It is expected that an ET system will examine and identify these signals precisely. Relevant feature extraction with appropriate signal processing...
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