Papers by Keyword: Interdigital Electrode

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Authors: Antonella Sciuto, Fabrizio Roccaforte, Salvatore di Franco, Vito Raineri, S.F. Liotta, Sergio Billotta, Giovanni Bonanno, Massimiliano Belluso
Abstract: The fabrication of high sensitive diodes array is very attractive for spectroscopic and astronomical UV imaging applications, particularly when visible light rejection is required. Wide band gap materials are excellent candidates for UV “visible blind” detection. In this paper, we demonstrate an array of Schottky UV-diodes on 4H-SiC with a single pixel area of about 1.44 mm2 and a total area of about 29 mm2. The Schottky photodiodes are based on the pinch-off surface effect, the front electrode being an interdigit Ni2Si contact that allows the direct light exposure of the optically active device area. For the proposed array, the optically active area is about the 48 % of total area. The single pixel dark current was below 0.1 nA up to –50 V and a fabrication yield of about 90 % was observed. The external quantum efficiency of the proposed array exhibits a peak of 45 % at the 289 nm wavelength and a visible rejection ratio > 4 ×103.
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Authors: Hafzaliza Erny Zainal Abidin, Azrul Azlan Hamzah, Mohd Ambri Mohamed, Burhanuddin Yeop Majlis
Abstract: Graphene has recently gained much interest in applications such as energy storage, catalysis and gas sensing. In terms of energy storage, micro supercapacitor has attracted a lot of interest in fields such as bioMEMS, biomedical implants such as cardiac pacemaker and the promising field of powering small electronic devices. In this paper, the structure of the micro supercapacitor PECVD graphene on electrodes consists of SiO2 substrate, graphene on Nickel (Ni) electrodes, with Polypyrrole (Ppy), graphene and Polyvinyl Alcohol (PVA) layers. To improve performance, graphene is one of the more promising material being investigated for micro supercapacitor electrodes due to several advantages such as high specific surface area and high electron mobility. Graphene was then grown on the Ni electrodes using the Plasma- Enhanced Chemical Vapor Deposition (PECVD) process. The graphene growth structure on the interdigital electrodes of micro supercapacitor was characterized by Raman Spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-Ray (EDX) and Atomic Force Microscopy (AFM). A Raman spectrum of graphene growth on interdigital electrode has identified three peaks which are the D band, G band and 2D band. The broad peaks at 1340 cm-1 and 1580 cm-1 correspond to the D and G bands, respectively.
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Authors: Alireza Hosseinmardi, M. Keyanpour-Rad, F. Alikhani Hesari
Abstract: Resistive relative humidity (RH) sensors were fabricated by nano composites of nylon-6 and titanium dioxide nanopowders. The results indicated that these sensors can be fabricated as a reliable, low cost and fast response instruments. Different percentages of nylon-6 and TiO2 were studied and average diameters of the resultant nanofibers were found the 80 to 120 nm. The nano composite of nylon-6/TiO2 nanofibers was electrospun on the interdigital gold electrode on the glass substrate. It was found that the impedance of the mat ranged from 107 Ω to 102 Ω while the relative humidity was increased from 11% RH and 97.3% at room temperature. Transition electron microscopy (TEM) and scanning electron microscopy (SEM) were used to study the morphology of the nano composite.
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Authors: Chang Fu Dee, Kean C. Aw, Bryon Wright, Xiao Dong Yan, Chong Wen Zou, Wei Gao, Muhamad Mat Salleh, Burhanuddin Yeop Majlis, Jong Duk Lee
Abstract: The limited sensitivity of thinfilm based sensors has motivated the search for sensing structures and materials with greater sensing performance. Although thinfilm based SAW devices have been used as force, pressure, chemical and gas sensors so far. It is limited by the exposed sensing surface of the thinfilm. A feasibility study has been done by implementing the ZnO nanorods (NRs) to enhance the device sensitivity by greatly increase the exposed sensing surface. The implementation of these ZnO NRs as sensing elements is expected to enhance the sensing power due to the large surface to volume ratio. The sensing mechanism in this design is by detecting the minute change of seismic mass for ZnO NRs using surface acoustic wave before and after the attachment of reacting chemical liquid and gas substance.
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