Chemisorption and sensitivity at semiconductor sensors revisited

Published on Apr 15, 2019in Sensors and Actuators B-chemical7.46
路 DOI :10.1016/J.SNB.2019.01.024
D.A. Mirabella5
Estimated H-index: 5
(National Research Council),
C. Buono8
Estimated H-index: 8
(National Research Council)
+ 1 AuthorsDaniel E. Resasco86
Estimated H-index: 86
(OU: University of Oklahoma)
Sources
Abstract
Abstract In this work we derived the adsorption isotherms for non-dissociative and dissociative chemisorption of oxygen on a semiconductor surface. We extended the Wolkenstein theory for dissociative chemisorption and re-examined the basis that led to currently accepted formalisms in the literature. In particular, we correctly incorporated dissociative chemisorption as a second-order reaction. We determined band bendings and adsorbate coverages for different gas pressure and doping for a typical metal-oxide used in gas sensing. Finally, consequences for the sensor conductivity and sensitivity are discussed.
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References34
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Abstract This study presents a theoretical investigation of the power-law response of metal oxide semiconductor gas sensors which is characterized by a linear dependence of the sensor resistance on gas pressure or concentration in double-logarithmic plots. The connection of sensor resistance with the gas partial pressure is realized by a set of differential equations, which describe the receptor and transducer functions of metal oxide semiconductor sensors. Then, the power-law response based on ...
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#1C. Buono (National Research Council)H-Index: 8
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Abstract We analyze the electrical conductivity of polycrystalline semiconductor solids due to the presence of Schottky-type potential barriers formed at intergrains. The density of charged dopants along the grains is usually considered constant leading to parabolic intergranular potential barriers. If temperature is high enough to allow sufficiently mobility to the dopants, their resulting equilibrium distribution is far from constant leading to potential barriers that show a strong non-parabol...
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In this paper, we propose a new model of adsorption鈥揹esorption (AD) noise in chemoresistive gas sensors by taking into account the polycrystalline structure of the sensing layer and the effect of the adsorbed molecule鈥檚 density fluctuation on the grain boundary barrier height. Using Wolkenstein鈥檚 isotherm, in the case of dissociative and non-dissociative chemisorption, combined with the electroneutrality, we derive an exact expression for power density spectrum (PDS) of the AD noise generated ar...
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#1Celso Manuel Aldao (National Research Council)H-Index: 20
#2Federico Schipani (National Research Council)H-Index: 8
Last. Federico J. Williams (Facultad de Ciencias Exactas y Naturales)H-Index: 28
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Conduction mechanisms in polycrystalline SnO2 thick sensing films were investigated by means of DC electrical resistance during heating鈥揷ooling cycles. Samples were maintained at relatively high temperatures in H2 or O2 ambient atmospheres before performing electrical measurements under vacuum or before performing XPS measurements in order to determine band bending. Results suggest that intergrains present Schottky barriers that are responsible for the observed conductivities regardless of gas p...
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#1A. Bejaoui (AMU: Aix-Marseille University)H-Index: 3
#2J. Guerin (AMU: Aix-Marseille University)H-Index: 3
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Abstract In this paper, we assumed that the ozone detection mechanism of p-type semiconductor resistive gas sensors in dry air is essentially due to adsorption of species O 2 , O 2 鈭 , O and O 鈭 at the surface of the grains. Based on the Wolkenstein adsorption theory, a dynamic model was formulated taking into account the chemical interactions between the sensor and chemisorbed species and the conduction mechanism. The present model predicts the coverage degree and sensor response as a function ...
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#1Aleksander Gurlo (Technische Universit盲t Darmstadt)H-Index: 31
Gas sensors are devices that change their physico-chemical properties according to the ambient gas, thus providing information about the composition of their ambient atmosphere. Ceramic gas sensors deserve special attention due to their social and economic impact and, accordingly, their role and their application areas have been constantly increasing during the past decade. The ceramic gas sensors are classified according to: (i) the sensing materials (receptors); and (ii) the physical propertie...
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#2J. Guerin (AMU: Aix-Marseille University)H-Index: 3
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Abstract The detection mechanism in gas sensors based on semiconductor materials is mainly due to charge-transfer. The interaction between the semiconductor surface and the gas is approached by the theory of chemisorption. Based on the Wolkenstein adsorption model, we propose a model simulating the reaction between the ionized oxygen species adsorbed at the surface of a p-type semiconductor with a reducing gas as a function of: (i) work temperature; (ii) oxygen pressure; (iii) gas concentration;...
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#1S. R. MorrisonH-Index: 1
#2Peder J. EstrupH-Index: 25
1. Introduction.- 1.1. Surface States and Surface Sites.- 1.1.1. The Chemical Versus Electronic Representation of the Surface.- 1.1.2. The Surface State on the Band Diagram.- 1.1.3. The Fermi Energy in the Surface State Model.- 1.1.4. Need for Both Surface Site and Surface State Models.- 1.2. Bonding of Foreign Species to the Solid Surface.- 1.2.1. Types of Interaction.- 1.2.2. The Chemical Bond.- 1.2.3. Acid and Basic Surface Sites on Solids.- 1.2.4. Adsorbate Bonding on Various Solid Types.- 1...
Chemoresistive properties of crystalline solids strongly depend on the concentration of stoichiometric defects. In the case of tin oxide, oxygen vacancies are a case in point of such kind of defects. We address the problem of band bending and Schottky barrier formation in tin oxide. We approached the problem of charged native defects, oxygen vacancies, in a metal oxide in equilibrium with an oxygen containing ambient under three equivalent points of view. We focused on the non-parabolic barriers...
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The chemisorption of O2 on nanoscale n-doped CdS semiconductors is computed in terms of a Wolkenstein isotherm coupled to the Schrodinger Poisson equation. Present numerical results show the dependence of the chemisorbed charge and the differential capacitance on oxygen partial pressure. A comparison against the classical Poisson-Boltzmann approach shows a higher chemisorbed charge in the quantum model, but a greater differential capacitance in the classical case.
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Abstract null null Potential barriers formed at the intergrain of polycrystalline metal-oxide semiconductors, such as tin oxide, present fluctuations that are usually ignored in the study of gas sensors responses. Fluctuations in the Schottky-type barriers arise from the punctual character and distribution of the charges at the depletion region. Accordingly, we present a numerical model that allows to determine the distribution of the barrier heights. We then analyze the influence of fluctuation...
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Spinel ferrites have attracted great interest in the research of sensing materials due to their excellent catalytic activity and flexible and tunable physical properties. Here, we report an environ...
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Abstract We investigated the power-law responses in two types of tin dioxide (SnO2) films: one made from nanosized grains and another from from very large grains, both under dry air. Experimental results revealed a significant dependence between the sensitivity and the SnO2 grain size. We therefore propose, that the gas sensor sensitivity is not only determined by oxygen chemisorption, but also by changes in the density of oxygen vacancies in response to changes in the ambient gas pressure. Band...
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Abstract Designing novel structures and selecting the right catalyst play significant roles to overcome the inherent limitations of chemical sensors. The transition metal-organic framework is one of the most promising precursors for the development of advanced gas sensors with high porosity. In this work, novel ZnO/ZnCo2O4 hetero-structured microspheres synthesized from a Zn鈥揅o-Prussian blue analog (PBA) precursor is rationally designed by changing the temperature of thermal treatment and the de...
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The paper describes the substance image formation based on the measurements by multisensor systems and the possibility of the development of a gas analysis device like an electronic nose. Classification of gas sensors and the need for their application for the recognition of difficult images of multicomponent air environments are considered. The image is formed based on stochastic transformations, calculations of correlation, and fractal dimensions of reconstruction attractors. The paper shows i...
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The identification of bis-3-(N,N-dimethylamino)propyl zinc ([Zn(DMP)2 ], BDMPZ) as a safe and potential alternative to the highly pyrophoric diethyl zinc (DEZ) as atomic layer deposition (ALD) precursor for ZnO thin films is reported. Owing to the intramolecular stabilization, BDMPZ is a thermally stable, volatile, nonpyrophoric solid compound, however, it possesses a high reactivity due to the presence of Zn-C and Zn-N bonds in this complex. Employing this precursor, a new oxygen plasma enhance...
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