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Sensor response formula for sensor based on ZnO nanostructures

Sensor response formula for sensor based on ZnO nanostructures,10.1016/j.snb.2009.10.037,Sensors and Actuators B-chemical,Niyom Hongsith,Ekasiddh Wong

Sensor response formula for sensor based on ZnO nanostructures   (Citations: 9)
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In this paper, we propose a new and general formula to describe ethanol adsorption mechanism underlying the response enhancement of ZnO nanostructure sensors. The derivation of sensor response formula based on basic chemical reaction at the sensor surface is presented. The formula can be used to explain response enhancement due to effect of metal doping, surface-to-volume ratio, and surface depletion layer. Thus, it can be regarded as a general formula to describe the sensor response characteristics of ZnO sensors. This general formula is a powerful tool for designing ZnO sensor at any desired sensor response. Furthermore, it is reasonable to expand this formula to explain other sensing materials and also to explain for different active gases.
Journal: Sensors and Actuators B-chemical - SENSOR ACTUATOR B-CHEM , vol. 144, no. 1, pp. 67-72, 2010
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    • ...From a rate equation of adsorption reaction of ethanol on the surface of ZnO [21]–[23], the sensitivity of the semiconducting oxide gas sensor can be represented as...
    • ...The value of generally equals to 0.5 and 1 for adsorbed surface oxygen species of O and O , respectively [19], [21], [23]...
    • ...Fig. 5 shows a plot of and at the optimum operating temperature of 300 C for the best performance of ethanol sensor (sensor B). The slope value ( value) is 0.45 which is nearly 0.5 suggesting the adsorbed surface oxygen species on the ZnO sensor is O [19], [23]...

    Niyom Hongsithet al. Enhancement of Ethanol Sensing Properties by Impregnating Platinum on ...

    • ...normally can be written as [23], [24], where is a gas concentration, is a constant depending on type of test gas, sensor material, and operating temperature whereas is generally equal to 0.5 or 1 for adsorbed surface oxygen species of or , respectively...

    T. Santhaveesuket al. Enhancement of Ethanol Sensing Properties by Alloying With ZnO Tetrapo...

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