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Sensors, Volume 1, Issue 6 (November 2001), Pages 183-214

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Research

Open AccessArticle A „Hybrid“ Thin-Film pH Sensor with Integrated Thick-Film Reference
Sensors 2001, 1(6), 183-192; doi:10.3390/s10600183
Received: 28 September 2001 / Accepted: 10 October 2001 / Published: 2 November 2001
Cited by 9 | PDF Full-text (544 KB) | HTML Full-text | XML Full-text
Abstract
A reference electrode fabricated by means of thick-film technique is deposited onto a silicon substrate and combined with a thin-film pH sensor to a “hybrid” chip system. To evaluate the suitability of this combination, first investigations were carried out. The characteristics of the
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A reference electrode fabricated by means of thick-film technique is deposited onto a silicon substrate and combined with a thin-film pH sensor to a “hybrid” chip system. To evaluate the suitability of this combination, first investigations were carried out. The characteristics of the thin-film pH sensor were studied towards the thick-film Ag/AgCl reference electrode. Measurements were performed in the capacitance/voltage (C/V) and constant capacitance (Concap) mode for different pH values keeping the concentration of chloride ions constant. No difference of the sensor behaviour could be found when comparing the results to measurements, obtained versus a conventional macroscopic Ag/AgCl reference electrode. Full article
Open AccessArticle A Carbon Nanotube-based Sensor for CO2 Monitoring
Sensors 2001, 1(6), 193-205; doi:10.3390/s10600193
Received: 8 October 2001 / Accepted: 17 October 2001 / Published: 2 November 2001
Cited by 46 | PDF Full-text (979 KB) | HTML Full-text | XML Full-text
Abstract
A carbon dioxide (CO2) sensor is fabricated by depositing a thin layer of a multiwall carbon nanotube (MWNT) – silicon dioxide (SiO2) composite upon a planar inductorcapacitor resonant circuit. By tracking the resonant frequency of the sensor the complex
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A carbon dioxide (CO2) sensor is fabricated by depositing a thin layer of a multiwall carbon nanotube (MWNT) – silicon dioxide (SiO2) composite upon a planar inductorcapacitor resonant circuit. By tracking the resonant frequency of the sensor the complex permittivity of the coating material can be determined. It is shown that the permittivity of MWNTs changes linearly in response to CO2 concentration, enabling monitoring of ambient CO2 levels. The passive sensor is remotely monitored with a loop antenna, enabling measurements from within opaque, sealed containers. Experimental results show the response of the sensor is linear, reversible with no hysteresis between increasing and decreasing CO2 concentrations, and with a response time of approximately 45 s. An array of three such sensors, comprised of an uncoated, SiO2 coated, and a MWNT-SiO2 coated sensors is used to self-calibrate the measurement for operation in a variable humidity and temperature environment. Using the sensor array CO2 levels can be measured in a variable humidity and temperature environment to a ± 3% accuracy. Full article
Open AccessArticle Sulfonated Polyaniline Coated Mercury Film Electrodes for Voltammetric Analysis of Metals in Water
Sensors 2001, 1(6), 206-214; doi:10.3390/s10600206
Received: 19 November 2001 / Accepted: 26 November 2001 / Published: 26 November 2001
Cited by 9 | PDF Full-text (90 KB) | HTML Full-text | XML Full-text
Abstract
The electrochemical polymerization of 2-aminobenzenesulfonic acid with and without aniline has been carried by cyclic potencial sweep in sulfuric acid solution at the glassy carbon electrode. The polymer and copolymer formed have been characterized voltammetrically. The sulfonated polyaniline coated mercury thin-film electrodes have
[...] Read more.
The electrochemical polymerization of 2-aminobenzenesulfonic acid with and without aniline has been carried by cyclic potencial sweep in sulfuric acid solution at the glassy carbon electrode. The polymer and copolymer formed have been characterized voltammetrically. The sulfonated polyaniline coated mercury thin-film electrodes have been evaluated for use with anodic stripping voltammetry. The electrodes were tested and compared with a conventional thin-film mercury electrode. Calibration plots showed linearity up to 10-7 mol L-1. Detection limits for zinc, lead and cadmium test species are very similar at around 12 nmol L-1. Applications to analysis of waters samples are demonstrated. Full article

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