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The final aim of this work is the realization of an automatic system based on amperometric measurements able to detect the phosphate in absence of the operator, thus in remote mode control, using automatic valves leaded by a software. The SPEs (screen-printed electrodes) thank to their small size and long term stability, can be easily embedded in a flow system for continuous in situ analysis. Gold...
The importance of the use of silica packing for gyroscopes and accelerometers quartz packaging is demonstrated. Technology of quartz packaging providing the ability to adjust the frequency of the laser resonator and the simultaneous formation of structures on opposite sides of the console using laser is discussed.
This paper describes a broadband energy harvester working on the principle of contact electrification or triboelectric charging. Design and fabrication of the device have been discussed. The device uses contact and separation mechanism using a cantilever to generate triboelectric charges. This mechanism introduces nonlinearity in the cantilever, which results in broadband behavior of triboelectric...
In this paper, a novel betavoltaic (BV) microcell based on semiconducting single-walled carbon nanotube (s-SWCNT) arrays/Si heterojunctions are demonstrated for the first time. The aligned arrays of p-type s-SWCNTs were prepared on n-type silicon to form the p-n heterojunctions as energy conversion by the traditional micro-fabrication process and dielectrophoretic (DEP) technology. The s-SWCNT arrays/Si...
Utilizing stiction, a common failure mode in micro/nano electromechanical systems (M/NEMS), we propose a method for the controlled fabrication of nanometer-thin gaps between electrodes. In this approach, a single lithography step is used to pattern cantilevers that undergo lateral motion towards opposing stationary electrodes separated by a defined gap. Upon wet developing of the pattern, capillary...
We present a wafer-level fabrication method for triboelectric energy harvester (TEH), which fabricates the TEH completely in batch fabrication process, without any manually assembly step. Finite element method (FEM) simulation was conducted to investigate the open-circuit potential distribution and short-circuit charge distribution. Experimental measurements show that this device can produce 235 mV...
This paper reports a new assembly process for isolated single-walled carbon nanotubes (SWCNTs) on MEMS structures utilizing single strand DNA (ssDNA) and the electrical properties of SWCNT field effect transistors (FETs). Mono-dispersed SWCNT solution was prepared by wrapping biotin modified ssDNA around SWCNT and the SWCNTs were assembled onto gold electrodes using biotin-avidin bindings. The isolated...
During the last decade, close resemblance between the zebrafish heart and human heart physiology has been discovered [1] andzebrafish (Danio rerio) has become an emerging animal model for studying side effects developmental drugs may impose on the heart [2][3]. More interestingly, contrary to human heart the zebrafish heart has a remarkable ability to “regenerate” after severe injury [4], making it...
ZnO nanorods, also known as metal-oxide semiconductor, with its high isoelectric point properties make it suitable for DNA application. To produce highly crystalline ZnO nanorods, the ZnO nanorods were synthesized using hydrothermal technique and annealed in the furnace at 500°C for 2 hours. XRD patterns indicates that the synthesized ZnO nanorods have preferred orientation along the (002) plane....
In this paper we expounded the optimal electrode material for fullerenes, being explored for the molecular electronics based applications. We scrutinized the largest curvature fullerene, C20 stringed to three different electrode materials viz. Copper, Silver and Gold using semi-empirical approach for this two probe modelling. We perceived that the transport phenomena for copper and silver electrodes...
By using a novel optical technique based on the electric field induced optical second harmonic generation (EFISHG) measurement, we can visualize carrier motions in organic devices. Basic concept for probing dynamical carrier motions by the EFISHG is described. We visualize carrier motions in organic field effect transistors, and model carrier transport mechanism. Further by coupling the EFISHG measurement...
The progress in the development of a piezoelectric immunosensor for the detection of a secretion protein (38 kDa) from Mycobacterium tuberculosis are described. A high affinity and specificity monoclonal antibody was obtained from a recombinant form of the target protein. This immunoreagent was employed for the development of a competitive ELISA, as a previous diagnostic test and reference assay for...
We studied electric field distribution changes induced in the active layer of ITO/PI/TIPS-pentacene/Au diodes by carrier injection. Upon application of a step voltage to the diodes, the electric field change across the TIPS-pentacene layer was measured. Significant electric field distribution change was suggested due to the carrier injection, and a simple model that accounts for the I-V characteristics...
TEOS and/or TEOS/HFE plasma polymerized thin films, exposed or non-exposed to ultraviolet (UVC) radiation, were obtained on gold electrodes and tested for electrochemical measurements. All films presented good performance on electrochemical measurements. The electronic signal does not change significantly after 24h on physiologic serum but thin TEOS films allow ion permeation. Thus, these films are...
The sensitive and simultaneous detection of zinc (Zn), cadmium (Cd) and lead (Pb) at gold ultramicroelectrode arrays (UMEAs) is reported. The device performance was based on the square-wave anodic stripping voltammetric technique. This consisted of the co-deposition of a layer of bismuth (Bi) together with the heavy metal target analytes onto the UMEA surface by applying a constant negative potential...
Advancements in technology can noticeably extend the knowledge of molecular biology for several types of cell cultures. However, at present there is a lack of available systems for real-time monitoring of cell behavior in-vitro. In this paper we propose a sensor for real-time monitoring of glucose and lactate in cell cultures, with the possibility to extend the detection to other metabolites. We explore...
An extended-gate CMOS sensor array with enzyme-immobilized microbeads for redox-potential glucose detection is demonstrated for the first time. Redox-potential detection has the possibility to achieve high accuracy because it is not affected by the buffer conditions. Despite this high-accuracy property, redox-potential detection requires a sufficient amount of enzyme, which leads to increased cost...
We describe an integrated CMOS electrochemical sensor with on-chip electrodes and packaging. The CMOS chip was fabricated in a standard 0.5 µm CMOS process, and it contains potentiostat circuits with integrated array of three electrode cells. In the potentiostat circuit, we designed high performance folded cascode class-AB operational amplifiers with rail to rail input and output suitable for low...
The Gigahertz Resonance at a gold nano-layer, coupled with an Electrochemical system allowed the investigation of the interfacial interaction of ions at the gold/aqueous solution boundary. The implications of the ion behavior under polarized electric fields are discussed. The study of non-Faradaic and Faradaic currents open the path for increased versatility as sensing device.
Neural interface devices have been used to retrieve bioelectrical signals from the nervous system to control prosthetics and muscle stimulators. The ability to identify specific electrical signals is important in order to control prosthetics and muscle stimulators. In this paper, we present the Texas peripheral Nerve Interface (TxNI) which combines a PDMS microchannel scaffold with microelectrodes...
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