New sensor arrays and sampling systems for a modular electronic nose

Stetter, Joseph R.; Strathmann, S; McEntegart, C; Decastro, M; Penrose, W.R.

doi:10.1016/s0925-4005(00)00503-7

Cited by 33 publications

(28 citation statements)

References 22 publications

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“…Nafion is a fluoropolymer with ion exchange capacity, and removes not only water but also volatile alcohols and some other polar solvents. Stetter et al [60] used a Nafion drier to remove water vapour from samples. Using the Nation membrane improved sensitivity of the electronic nose (MOSES II) to detect and discriminate coliform bacteria [60,61].…”

Section: Discussion and Trendsmentioning

confidence: 99%

“…Stetter et al [60] used a Nafion drier to remove water vapour from samples. Using the Nation membrane improved sensitivity of the electronic nose (MOSES II) to detect and discriminate coliform bacteria [60,61]. The improvement in the analytical capability was obtained here by suppressing the background that was common to all samples.…”

Section: Discussion and Trendsmentioning

confidence: 99%

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05/01826 Microbial volatile organic compounds as indicators of fungi. Can an electronic nose detect fungi in indoor environments?

2005

Fuel and Energy Abstracts

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Abstract:The paper presents a review of several studies on the detection of microbial volatile organic compounds (MVOCs) considered as indicators of fungal contamination. As fungi produce specific profiles, or fingerprints of volatile compounds, the electronic nose technology is a very promising opportunity for rapid and non costly detection of fungi in buildings. E-noses are able to distinguish between mouldy and non-mouldy samples, and also to recognise certain species of fungi. However, two limiting factors may appear decisive for employment of electronic noses in indoor fungi detection: low concentrations of MVOCs and presence of interfering substances in indoor environments.

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Section: Discussion and Trendsmentioning

confidence: 99%

Section: Discussion and Trendsmentioning

confidence: 99%

05/01826 Microbial volatile organic compounds as indicators of fungi. Can an electronic nose detect fungi in indoor environments?

2005

Fuel and Energy Abstracts

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“…The principle of gas detection by conductivity changes is the adsorption of the volatile analytes on composites consisting of a conductive matrix blended with polymers for which the analytes have variable affinities. [19][20][21] As the analytes adsorb to the polymers, the dimensions of the composites change slightly, resulting in small but detectable changes in conductance. Various polymers, especially polyheterocycles such as polypyrroles, have been employed for their capacity to bind volatile analytes.…”

Section: Polymer-based Sensorsmentioning

confidence: 99%

Novel Materials and Applications of Electronic Noses and Tongues

Gouma¹,

Sberveglieri²

2004

MRS Bull.

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This introductory article describes the content of the October 2004 issue of MRS Bulletin focusing on novel materials and applications of electronic noses and tongues.The articles in this issue review the state of the art in materials, devices, and data processing algorithms used in electronic olfaction and taste systems. The most common gas- and liquid-phase analyte detection tools are presented and compared with traditional chemical analysis instrumentation such as gas chromatography/mass spectroscopy systems. Metal oxides, polymer/polymer composites, and dyes are covered in these articles as key sensing materials. Resistive, optical, electrochemical, and other types of electronic nose and tongue systems are reviewed, and their use in diverse applications, including environmental and food-quality monitoring and medical diagnostics, is discussed.

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“…Electronic noses have been developed in order to yield information on these basic parameters by using solid state gas sensors in combination with conventional polymers for the detection of various analytes. [1][2][3][4][5][6][7][8] However, due to their still insufficient selectivity, current gas sensors do not allow one to detect all single compounds or a combination of analyte molecules on a complex background. This is due to the fact that, in most cases, the recognition of the analytes is unspecific and relies on a simple sorption/desorption process of the analyte in the metal oxide semiconductor material or in a polymer coating.…”

mentioning

confidence: 99%

“…This is due to the fact that, in most cases, the recognition of the analytes is unspecific and relies on a simple sorption/desorption process of the analyte in the metal oxide semiconductor material or in a polymer coating. [1][2][3][4][5][6][7][8] To overcome this limitation, new functional materials have to be developed in order to design sensors with improved selectivity and sensitivity and to give a fast analysis. In this article, we describe the first use of reversible chemical reactions for the development of CMOSbased calorimetric microsensors with enhanced selectivity.…”

mentioning

confidence: 99%

Using Reactands in CMOS-based Calorimetric Sensors: New Functional Materials for Electronic Noses

Mohr

Zhylyak²,

Nezel³

et al. 2002

ANAL. SCI.

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One of the major targets for public health is the safety and quality of products addressed to human consumption which may be characterized by their taste and smell. Electronic noses have been developed in order to yield information on these basic parameters by using solid state gas sensors in combination with conventional polymers for the detection of various analytes. [1][2][3][4][5][6][7][8] However, due to their still insufficient selectivity, current gas sensors do not allow one to detect all single compounds or a combination of analyte molecules on a complex background. This is due to the fact that, in most cases, the recognition of the analytes is unspecific and relies on a simple sorption/desorption process of the analyte in the metal oxide semiconductor material or in a polymer coating. [1][2][3][4][5][6][7][8] To overcome this limitation, new functional materials have to be developed in order to design sensors with improved selectivity and sensitivity and to give a fast analysis. In this article, we describe the first use of reversible chemical reactions for the development of CMOSbased calorimetric microsensors with enhanced selectivity. The recognition is based on the reaction of the trifluoroacetyl group of a chemosensor molecule with the amino group of 1-butylamine to form a hemiaminal. Since the chemosensor combines both the properties of a chemical reagent with those of a selective ligand, it is termed "reactand". So far, we have already used optical sensors based on chromogenic and fluorogenic reactands to detect alcohols, 9 aldehydes 10 and amines. 11 However, optical sensors are more difficult to miniaturize than CMOS-based devices because they require light sources, waveguides and detectors. Furthermore, the use of CMOS-based microsensors provides response times in the range of seconds rather than minutes. Consequently, reactandbased functional materials are a step towards more selective microsensors intended to be used in electronic noses and tongues. ExperimentalIn order to determine the reaction enthalpy and entropy of the chromogenic reactand 4-N,N-dioctylamino-4′-trifluoroacetylazobenzene (ETH T 4001) in organic solvents, the absorbance spectra were recorded on a Specord S100 spectrometer (Zeiss, Germany) in a temperature range from 293 to 343 K at intervals of 10 K. Upon the addition of 1-butylamine to ETH T 4001 in toluene or acetonitrile, the trifluoroacetyl form of the dye was converted into the hemiaminal (Fig. 1) and a shift of the maxima from around 490 nm to around 430 nm occurred. Different amounts of 1-butylamine were added to evaluate the equilibrium constants for the reaction of ETH T 4001 with the amine at different temperatures. The spectroscopic changes of ETH T 4001 were then used to calculate the equilibrium constants of the chemical reactions at different temperatures, allowing the determination of the reaction entropy and enthalpy via the van't Hoff plot and the Gibbs-Helmholtz equation. 12 The dipole moments of the trifluoroacetyl and hemiaminal form of the reactand we...

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New sensor arrays and sampling systems for a modular electronic nose

Cited by 33 publications

References 22 publications

05/01826 Microbial volatile organic compounds as indicators of fungi. Can an electronic nose detect fungi in indoor environments?

05/01826 Microbial volatile organic compounds as indicators of fungi. Can an electronic nose detect fungi in indoor environments?

Novel Materials and Applications of Electronic Noses and Tongues

Using Reactands in CMOS-based Calorimetric Sensors: New Functional Materials for Electronic Noses

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