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Sensors, Volume 2, Issue 3 (March 2002), Pages 71-126

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Research

Open AccessArticle The Preparation of ZnGa2O4 Nano Crystals by Spray Coprecipitation and Its Gas Sensitive Characteristics
Sensors 2002, 2(3), 71-78; doi:10.3390/s20300071
Received: 3 February 2002 / Accepted: 22 February 2002 / Published: 12 March 2002
Cited by 16 | PDF Full-text (1211 KB) | HTML Full-text | XML Full-text
Abstract
ZnGa2O4 nano crystals were prepared by an improved coprecipitation method, which we call ‘spray coprecipitation’. XRD results shows the resulting crystal size using the new method is under 10nm, whereas the powder prepared by ordinary coprecipitation is about 30nm. XRD
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ZnGa2O4 nano crystals were prepared by an improved coprecipitation method, which we call ‘spray coprecipitation’. XRD results shows the resulting crystal size using the new method is under 10nm, whereas the powder prepared by ordinary coprecipitation is about 30nm. XRD results also shows ZnO peaks exists in ZnGa2O4 powder prepared by traditional coprecipitation, but disappears in ZnGa2O4 nano crystal prepared by spraying coprecipitation. SEM and TEM were used to analysis the structural characteristics of ZnGa2O4 nano crystals. The gas sensitive characteristics of ZnGa2O4 nano crystals are reported. Full article
(This article belongs to the Special Issue Nano-Porous Sensor Material)
Open AccessArticle Mass Transfer in Amperometric Biosensors Based on Nanocomposite Thin Films of Redox Polymers and Oxidoreductases
Sensors 2002, 2(3), 79-90; doi:10.3390/s20300079
Received: 13 February 2002 / Accepted: 28 February 2002 / Published: 12 March 2002
Cited by 15 | PDF Full-text (201 KB) | HTML Full-text | XML Full-text
Abstract
Mass transfer in nanocomposite hydrogel thin films consisting of alternating layers of an organometallic redox polymer (RP) and oxidoreductase enzymes was investigated. Multilayer nanostructures were fabricated on gold surfaces by the deposition of an anionic self-assembled monolayer of 11-mercaptoundecanoic acid, followed by the
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Mass transfer in nanocomposite hydrogel thin films consisting of alternating layers of an organometallic redox polymer (RP) and oxidoreductase enzymes was investigated. Multilayer nanostructures were fabricated on gold surfaces by the deposition of an anionic self-assembled monolayer of 11-mercaptoundecanoic acid, followed by the electrostatic binding of a cationic redox polymer, poly[vinylpyridine Os(bis-bipyridine)2Clco-allylamine], and an anionic oxidoreductase. Surface plasmon resonance spectroscopy, Fourier transform infrared external reflection spectroscopy (FTIR-ERS), ellipsometry and electrochemistry were employed to characterize the assembly of these nanocomposite films. Simultaneous SPR/electrochemistry enabled real time observation of the assembly of sensing components, changes in film structure with electrode potential, and the immediate, in situ electrochemical verification of substrate-dependent current upon the addition of enzyme to the multilayer structure. SPR and FTIR-ERS studies also showed no desorption of polymer or enzyme from the nanocomposite structure when stored in aqueous environment occurred over the period of three weeks, suggesting that decreasing in substrate sensitivity were due to loss of enzymatic activity rather than loss of film compounds from the nanostructure. Full article
(This article belongs to the Special Issue Nano-Porous Sensor Material)
Open AccessArticle Room Temperature Ammonia and Humidity Sensing Using Highly Ordered Nanoporous Alumina Films
Sensors 2002, 2(3), 91-110; doi:10.3390/s20300091
Received: 9 February 2002 / Accepted: 1 March 2002 / Published: 18 March 2002
Cited by 71 | PDF Full-text (2264 KB) | HTML Full-text | XML Full-text
Abstract
The effect of pore size and uniformity on the response of nanoporous alumina, formed on aluminum thick films through an anodization process, to ammonia and humidity at room temperature is reported. Pore sizes examined range from 13 nm to 48 nm, with pore
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The effect of pore size and uniformity on the response of nanoporous alumina, formed on aluminum thick films through an anodization process, to ammonia and humidity at room temperature is reported. Pore sizes examined range from 13 nm to 48 nm, with pore size standard deviations ranging from 2.6 nm to 7.8 nm. The response of the material to ammonia and humidity is a strong function of pore size and operating frequency. At 5 kHz an alumina sensor with an average pore size of 13.6 nm, standard deviation 2.6 nm, exhibits a factor of two change in impedance magnitude as it is cycled between an ammonia and argon environment. At 5 kHz the same sensor exhibits a well-behaved change in impedance magnitude of 103 over 20% to 90% relative humidity. Cole-Cole plots of the 5 Hz to 13 MHz measured impedance spectra, modeled using equivalent circuits, are used to resolve the effects of adsorption and ion migration. Full article
(This article belongs to the Special Issue Nano-Porous Sensor Material)
Open AccessArticle Nanoporous Platforms for Cellular Sensing and Delivery
Sensors 2002, 2(3), 111-120; doi:10.3390/s20300111
Received: 5 March 2002 / Accepted: 19 March 2002 / Published: 20 March 2002
Cited by 13 | PDF Full-text (3894 KB) | HTML Full-text | XML Full-text
Abstract
In recent years, rapid advancements have been made in the biomedical applications of micro and nanotechnology. While the focus of such technology has primarily been on in vitro analytical and diagnostic tools, more recently, in vivo therapeutic and sensing applications have gained attention.
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In recent years, rapid advancements have been made in the biomedical applications of micro and nanotechnology. While the focus of such technology has primarily been on in vitro analytical and diagnostic tools, more recently, in vivo therapeutic and sensing applications have gained attention. This paper describes the creation of monodisperse nanoporous, biocompatible, silicon membranes as a platform for the delivery of cells. Studies described herein focus on the interaction of silicon based substrates with cells of interest in terms of viability, proliferation, and functionality. Such microfabricated nanoporous membranes can be used both in vitro for cell-based assays and in vivo for immunoisolation and drug delivery applications. Full article
(This article belongs to the Special Issue Nano-Porous Sensor Material)
Open AccessArticle Multiparametric Porous Silicon Sensors
Sensors 2002, 2(3), 121-126; doi:10.3390/s20300121
Received: 10 April 2002 / Accepted: 11 April 2002 / Published: 11 April 2002
Cited by 40 | PDF Full-text (101 KB) | HTML Full-text | XML Full-text
Abstract
We investigated the possibility of using several sensing parameters from porous silicon in order to improve gas selectivity. By fabricating porous silicon optical microcavities, three independent quantities can be measured, i.e. the electrical conductance, the photoluminescence intensity, and the wavelength of the optical
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We investigated the possibility of using several sensing parameters from porous silicon in order to improve gas selectivity. By fabricating porous silicon optical microcavities, three independent quantities can be measured, i.e. the electrical conductance, the photoluminescence intensity, and the wavelength of the optical resonance. We monitored the change of these three parameters as a function of NO2 (0.5-5 ppm), ethanol (300-15000 ppm) and relative humidity (0-100%). Preliminary results confirm that the examined species affect the parameters in a different way, both as a relative change and as dynamic. Full article
(This article belongs to the Special Issue Nano-Porous Sensor Material)

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