Non-linear dynamic responses of a semiconductor gas sensor: Evaluation of kinetic parameters and competition effect on the sensor response

Nakata, Satoshi; Takemura, Kaori; Neya, Kayoko

doi:10.1016/s0925-4005(01)00652-9

Cited by 31 publications

(12 citation statements)

References 22 publications

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“…By combining the reactions, it is possible to describe how the concentration of surface ions changes with time. Adopting a similar approach to Nakata et al [26], the concentration of Oions, [O -], varies according to where P O2 and P CO are the partial pressures of O 2 and CO, respectively, and P TOT is the total pressure in the system. Due to the reaction of Oions with CO from the gas phase, CO ) .…”

Section: Model Formulationmentioning

confidence: 99%

“…In the absence of surface catalysts, the complexity of the Langmuir-Hinshelwood model may be avoided by instead assuming an Eley-Rideal mechanism [19][20][21][22][23][24][25][26] for the reaction; in this regime, the reducing species reacts with oxygen ions directly, without first adsorbing to the surface. By neglecting adsorption of the reducing gas, there are fewer surface reactions to consider when constructing a physical description of the system.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the kinetics of surface reactions on a zinc oxide nanosheet-based carbon monoxide sensor using an Eley–Rideal model

Jones

Maffeïs

2015

Sensors and Actuators B: Chemical

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Herein, we experimentally test a mathematical model of the reactions on the surface of a zinc oxide nanosheet-based carbon monoxide sensor. The carbon monoxide is assumed to react with surface oxygen via an Eley-Rideal mechanism, considering only the direct reaction between the two species. We demonstrate that the measured resistance responses of the system are well described by the model, facilitating further analysis of the physical rate constants in the system. By initially considering the system in the absence of any reducing gas, it is shown that various reaction parameters may be precisely estimated. For instance, fitting the model to response curves obtained at different temperatures shows the activation energy of the reaction between oxygen ions and carbon monoxide to be 54 ± 9 kJ mol-1 , whereas the recovery curves yield an estimate of 42 ± 7 kJ mol-1. Similarly, the energy barrier for the formation of oxygen ions is found to equal 72 ± 9 kJ mol-1 from the sensor response and 63 ± 10 kJ mol-1 from the recovery. These estimates are in agreement with values quoted elsewhere in the literature, corroborating the validity of the model. In the absence of surface ions, the energy difference between the Fermi level and the conduction band minimum at the surface is estimated as 590 ± 90 meV.

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Section: Model Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the kinetics of surface reactions on a zinc oxide nanosheet-based carbon monoxide sensor using an Eley–Rideal model

Jones

Maffeïs

2015

Sensors and Actuators B: Chemical

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“…If we assume that N d is significantly larger than N t , Equation 13 can be obtained from Equations 11 and 12.…”

Section: Theoretical Simulation Of the Effect Of Competition On The Smentioning

confidence: 99%

“…The characteristic features of a sensor response are expected to depend on the chemical structure, concentration, and kinetics of gas molecules (adsorption, desorption, and oxidation) at the sensor surface. We have reported that it is possible to distinguish between gases in a gaseous mixture with a single gas sensor based on the higher harmonics [8,11,13,14]. However, the effect of competition among gas species on the nonlinear response has not yet been physicochemically clarified.…”

Section: Introductionmentioning

confidence: 99%

A Semiconductor Gas Sensor Based on Nonlinearity: Utilization of the Effect of Competition on the Sensor Responses to Gaseous Mixtures

2002

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“…simple gas mixtures result in involved response patterns) and sensor drift or ambient humidity interference that can significantl affect the d.c. component and first harmonic of the FFT, destroying the discrimination ability. By further developing the idea of Sears 10 , Nakata and co-workers [11][12][13][14][15][16][17][18][19][20][21][22] showed that the higher harmonics of the FFT of a temperature-modulated (using a sinusoidal signal) tin oxide gas sensor exhibit characteristic features in the presence of different gases. They showed that the real part of the higher harmonics depends on the surface barrier potential, V s , which depends on the metal oxide (e.g.…”

Section: Introductionmentioning

confidence: 99%

Temperature-modulated gas sensors: selection of modulating frequencies through noise methods

et al. 2004

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Metal oxide gas sensors suffer from lack of selectivity and response drift. The use of sensor dynamics has been introduced to ameliorate sensor performance. The usual approach consists of modulating the operating temperature of gas sensors. Temperature modulation alters the kinetics of the adsorption and reaction processes taking place at sensors' surface. This results in response patterns that are characteristic of gas/sensor pairs. Despite the fact that a great deal of work has been done, the selection of the modulating frequencies remains an obscure and non-systematic method. A new approach to systematically select frequencies is discussed. The method is based on the use of pseudo-random binary sequences (MLS) to modulate the working temperature of gas sensors in a wide frequency range. The impulse response of a pair sensor-gas can be estimated from the circular cross-correlation of the MLS and the sensor response sequences. From the study of the impulse response in the frequency domain, an identification of the modulating frequencies that convey important information to both identify and quantify gases is obtained.

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Non-linear dynamic responses of a semiconductor gas sensor: Evaluation of kinetic parameters and competition effect on the sensor response

Cited by 31 publications

References 22 publications

Analysis of the kinetics of surface reactions on a zinc oxide nanosheet-based carbon monoxide sensor using an Eley–Rideal model

Analysis of the kinetics of surface reactions on a zinc oxide nanosheet-based carbon monoxide sensor using an Eley–Rideal model

A Semiconductor Gas Sensor Based on Nonlinearity: Utilization of the Effect of Competition on the Sensor Responses to Gaseous Mixtures

Temperature-modulated gas sensors: selection of modulating frequencies through noise methods

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