Conduction mechanism switch for SnO2 based sensors during operation in application relevant conditions; implications for modeling of sensing

Bârsan, Nicolae; Rebholz, Julia; Weimar, Udo

doi:10.1016/j.snb.2014.10.016

Cited by 77 publications

(64 citation statements)

References 19 publications

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“…One reason for this is the changed transduction function. IPC450w and IPC1000 show a decreased power (parameter n) for low CO concentrations in humid conditions, which can be explained by the competition of CO and water for the same reaction partners as presented in [3], even if the CO could also react with lattice oxygen [9]. This decrease can be seen for IPC450y in 50%r.h.…”

Section: Resultsmentioning

confidence: 84%

“…the IPC450w appears white at room temperature and changes its color to yellowish by heating, while the IPC450y powder is always yellowish. Keeping in mind that low changes in calcination temperature at around 450°C lead to large changes of lattice distortion, crystallinity and other material properties (see [1,3]), these differences in material properties originate from a slightly different calcination process/temperature. That the material properties of IPC1000 and IPC450 samples are extremely different is demonstrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The associated charge transfer processes lead to changes in the electrical resistance of the sensing layer due to variation of the barriers height at the grain boundaries, which originate from surface depletion layers. However, recently, it was demonstrated that the processes are not that simple as the transduction as well as reception can change even in realistic application conditions during exposure to target gases [3]. E.g.…”

Section: Introductionmentioning

confidence: 99%

“…It is important to note that the magnitude of the sensor signal and its variation with the concentration of target gas depends on the conduction mechanism, which ensures the transduction of surface chemistry into changes of the electrical resistance of the sensing layer [4]. A change in conduction mechanism has dramatic consequences on the sensing performance and is a reason why it is so difficult to fit the full sensor response with one function [3].…”

Section: Introductionmentioning

confidence: 99%

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A Self-doping Surface Effect and its Influence on the Sensor Performance of Undoped SnO2 Based Gas Sensors

Rebholz

Dee

Bârsan

2015

Procedia Engineering

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The variation of the calcination temperature in the fabrication procedure of sol-gel SnO 2 thick film gas sensors leads to very different sensing characteristics [1]. In the present studies, the conduction mechanism and electrical characteristics of the surface of undoped SnO 2 based sensing materials -calcined at different temperatures -are investigated by performing DC electrical resistance and work function changes measurements. The results show for the first time the existence of an intrinsic surface band bending for undoped SnO 2 (calcination temperature 450°C). Because an intrinsic surface band bending has a big impact on the conduction mechanism and the concentration of surface species, which have an influence on the electrical resistance, the sensing performance is dramatically changed. The effect is similar to 1 at.% Ni surface loading, which showed a huge intrinsic surface band bending and an enhanced sensing performance in comparison to the undoped base material [2].

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Section: Resultsmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Self-doping Surface Effect and its Influence on the Sensor Performance of Undoped SnO2 Based Gas Sensors

Rebholz

Dee

Bârsan

2015

Procedia Engineering

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“…This ionization takes place by capturing free-charge carries from the bulk of the n-type semiconductor oxide and lead to an increase of the electrical resistance of the sensor sensing layer. In the presence of reducing gases, the adsorbed oxygen ions are reacting with them, which free the electrons and decrease the sensor resistance [17,18].…”

Section: Introductionmentioning

confidence: 99%

Microwave assisted synthesis of hierarchical Pd/SnO2 nanostructures for CO gas sensor

Wang

Sun

et al. 2016

Sensors and Actuators B: Chemical

119

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Chemical and Biochemical Sensors, 2. Applications

Bârsan

Gauglitz

Oprea

et al. 2016

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Chemical Sensors 2.1. Gas Sensors 2.1.1. Humidity Sensors 2.1.1.1. General Considerations 2.1.1.2. Humidity Sensors Types 2.1.1.3. Humidity Sensors in Applications 2.1.2. Semiconducting Metal Oxides 2.1.2.1. History and Current Status 2.1.2.2. Operation Principle and Materials 2.1.2.3. Fabrication Technology 2.1.2.4. Electronic Circuitries for Signal Generation 2.1.2.5. Sensor Properties and Specifications 2.1.2.6. Fields of Application 2.1.2.7. Future Trends 2.2. Electronic Noses and Tongues 2.2.1. Applications 2.2.2. Issues of Concern 2.2.3. Outlook 3. Biochemical Sensors 3.1. Assays 3.1.1. Assay Types and Flow Injection Analysis (FIA) 3.1.2. Marker–Label Free 4. Gas Sensors 4.1. Fields of Application 4.1.1. Indoor Air Quality Control 4.1.2. Indoor Gas Sensors for Toxic and Explosive Gases 4.1.3. Breath Gas Analysis 4.1.4. Automotive 4.2. Process Control 4.2.1. Industrial Process Sensors 4.2.1.1. Process Analytical Technology 4.2.1.2. Sensor Market 4.2.1.3. Sensors for Plant Safety 4.2.1.4. Requirements for Industrial Process Sensors 4.2.2. Sensor Integration in Process Environment 4.2.2.1. Sampling Systems 4.2.2.2. Sensor Communication 4.2.2.3. Feedback and Feedforward Control Loops 4.2.3. Application: Process Control in the Production of Renewable Energy 4.2.3.1. Biogas 4.2.3.2. Process Analytics during Fermentation and Purification 4.2.3.3. Process Analytics of Downstream Processes 4.2.3.4. Monitoring Quality Parameters and Perspectives 4.3. Point of Care Diagnostics 4.3.1. Introduction to Special Requirements 4.3.2. Areas of Application 4.3.2.1. Ambulance and Home Care 4.3.2.2. Personalized Medicine 4.3.2.3. Infections 4.3.2.4. POCT and Telemedicine 4.3.3. Devices 4.3.3.1. Lateral Flow 4.3.3.2. Benchtop 4.3.3.3. Lab‐on‐Chip Platforms 4.3.4. Trends and Perspectives 4.4. Environmental and Food Analytics 4.4.1. Introduction 4.4.1.1. Water Analysis 4.4.1.2. Food 4.4.2. Trends and Perspectives 4.5. Sensors with Multiplexing Approaches: Microplates and Microarrays 4.6. Further Applications 4.6.1. Special Fluorescence Sensor Applications 4.6.1.1. Blood Monitoring 4.6.1.2. Pressure Sensitive Paints 4.6.2. Mass Sensitive Sensors 4.6.2.1. Gas Phase 4.6.2.2. Liquid Phase 4.6.2.3. Biosensors

show abstract

Conduction mechanism switch for SnO2 based sensors during operation in application relevant conditions; implications for modeling of sensing

Cited by 77 publications

References 19 publications

A Self-doping Surface Effect and its Influence on the Sensor Performance of Undoped SnO2 Based Gas Sensors

A Self-doping Surface Effect and its Influence on the Sensor Performance of Undoped SnO2 Based Gas Sensors

Microwave assisted synthesis of hierarchical Pd/SnO2 nanostructures for CO gas sensor

Chemical and Biochemical Sensors, 2. Applications

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