By Korotchenkov, G. S.
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Extra info for Chemical Sensors : Comprehensive Sensors Technologies
2006). 5. ILs are excellent solvents that can support many types of solvent–solute interactions (hydrogen bond, –, dipolar, ionic, dispersive forces) (Welton 1999). The use of ILs as electrolytes can also eliminate the need for a membrane and added supporting electrolytes, which is needed in conventional “Clark”-type gas sensors. The negligible vapor pressure and ELECTROCHEMICAL GAS SENSORS 29 high thermal stability make the gas sensors based on ILs promising in more extreme operating conditions, such as high temperature and pressures (Buzzeo et al.
Cyclic voltammetry is especially powerful in the study of electrode reaction mechanisms. In LSV, the potential sweeps linearly in one direction for one time. 1). 1. Amperometry. Electrons cross the electrode–electrolyte interface with the help of a faradaic process (electrochemical reaction involving the analyte, electrolyte, and/or electrode). The electrons then flow (observed as a current) in the external circuit. 6 CHEMICAL SENSORS. VOLUME 5: ELECTROCHEMICAL AND OPTICAL SENSORS Square-wave voltammetry (SWV) and differential pulse voltammetry (DPV) also belong to the widely used voltammetry techniques.
1986). Larger molecules are prevented from adsorption in the cage and smaller molecules may not change the Na+ activity efficiently. Upon being occupied by the C3H8, the Na+ activity in the zeolite is reduced, lowering the potential of the sensing electrode. In general, adsorption is the name given to solid/gas interfacial bonds with the special case of chemisorptions for high-energy interactions, while physisorption refers to low-energy dispersive forces between the sorbate and sorbent, typically 5 kcal/mole or less.