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Amperometric sensors structure

Modification of the sensor structure. The above amperometric sensor has a rather complicated construction, because the sample gas (H2 + air) is separated from the reference air. So, we tried to simplify the sensor structure as shown in Figure 9. As proton conductor we used a thin antimonic acid membrane (mixed with Teflon powder) of 0.2 mm thickness. This membrane is thin and porous enough to allow a part of the sample gas to permeate. On the other hand, the counter Pt electrode was covered with Teflon and Epoxy resin in order to avoid a direct contact with the sample gas. [Pg.208]

Figure 9. Structure of the modified amperometric sensor. "Reproduced with permission from Ref. 13. Copyright 1984, The Chemical Society of Japan. "... Figure 9. Structure of the modified amperometric sensor. "Reproduced with permission from Ref. 13. Copyright 1984, The Chemical Society of Japan. "...
Different other attractive way to modify the active electrode of amperometric sensors, besides deposition of polymers or electropolymerization, is formation of self-assembled structures, e.g., self-assembled monolayers (SAM) on solid supports 88 89 or bilayer lipid membranes (BLM) on various types of support.90 Both types of theses structures can either induce selectivity of sensor to particular analytes and... [Pg.42]

Fig. 36.5. Structure of the thick-film type proton conductor sensor, (a) planar-type potentio-metric sensor, (b) laminated-type amperometric sensor (reprinted by permission of Elsevier Sequoia S.A.). Fig. 36.5. Structure of the thick-film type proton conductor sensor, (a) planar-type potentio-metric sensor, (b) laminated-type amperometric sensor (reprinted by permission of Elsevier Sequoia S.A.).
The applications of monolayers range from the development of electronic components and biocompatible devices to lubricating thin layers, corrosion prevention, and so on. The aim of this chapter is to sketch the structure, properties, and preparation methods of monolayers and to discuss the relevant most important electroanalytical applications it is focused oti the most commOTi monolayers used in the frame of amperometric sensors. [Pg.105]

Inoue KY, Matsudaira M, Nakano M, Ino K, Sakamoto C, Kanno Y, Kubo R, Kunikata R, Kira A, Suda A, Tsurumi R, Shioya T, Yoshida S, Muroyama M, Ishikawa T, Shiku H, Satoh S, Esashi M, Matsue T (2015) Advanced LSI-based amperometric sensor array with lightshielding structure for effective removal of photocurrent and mode selectable function for individual operation of 400 electrodes. Lab Chip 15 848-856... [Pg.139]

Amperometric cells, sensors using, 22 271 Amperometric measurements, 14 612 Amphetamine, 3 89-90 Amphibole asbestos, 1 803 3 288 crystal structure, 3 297-298 exposure limits, 3 316 fiber morphology, 3 294-295 silicate backbone, 3 296 Amphibole potassium fluorrichterite, glass- ceramics based on, 12 637 Amphiphile-oil-water-electrolyte phase diagram, 16 427-428 Amphiphile-oil-water phase diagrams,... [Pg.53]

The construction and response of amperometric biosensors for glucose, acetylcholine, and glutamate based on these polymeric materials are described, and the dependence of sensor response on the polymer structure is discussed. [Pg.117]

CNTs and other nano-sized carbon structures are promising materials for bioapplications, which was predicted even previous to their discovery. These nanoparticles have been applied in bioimaging and drag delivery, as implant materials and scaffolds for tissue growth, to modulate neuronal development and for lipid bilayer membranes. Considerable research has been done in the field of biosensors. Novel optical properties of CNTs have made them potential quantum dot sensors, as well as light emitters. Electrical conductance of CNTs has been exploited for field transistor based biosensors. CNTs and other nano-sized carbon structures are considered third generation amperometric biosensors, where direct electron transfer between the enzyme active center and the transducer takes place. Nanoparticle functionalization is required to achieve their full potential in many fields, including bio-applications. [Pg.274]

Amperometric gas sensors are - electrochemical cells that produce a - current signal directly related to the concentration of the - analyte by - Faraday s law and the laws of - mass transport. The schematic structure of an amperometric gas sensor is shown in Fig. 1. The earliest example of this kind of sensor is the - Clark sensor for oxygen. Since that time, many different geometries, membranes, and electrodes have been proposed for the quantification of a broad range of analytes, such as CO, nitrogen oxides, H2S, O2, hydrazine, and other vapors. [Pg.293]

Potentiodynamic gas sensors have a schematic structure that is practically equal to that of amperometric gas sensors. They are -> electrochemical cells that measure a -> current signal directly related to the concentration of the analyte, but are not necessary operated in a region where -> mass transport is limiting. They are typically employed to detect less reactive species such as benzene and halogenated hydrocarbons that require a previous accumulation step at a suitable -> adsorption potential to be then reduced or oxidized according to a given potential scan [iii]. The adsorption time can be automat-... [Pg.294]


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See also in sourсe #XX -- [ Pg.206 , Pg.208 , Pg.210 ]




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Amperometric sensors

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