Selectivity enhancement of SnO2 gas sensors: simultaneous monitoring of resistances and temperatures

Heilig, Andrej; Bârsan, Nicolae; Weimar, Udo; Göpel, Wolfgang

doi:10.1016/s0925-4005(99)00091-x

Cited by 59 publications

(23 citation statements)

References 1 publication

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“…The BaSnO 3 gas sensitive layer is deposited onto the suspended micro-hotplate taking advantage of the sensing layer deposition method called microdropping (or drop-coating) [28][29][30][31][32][33][34]. Briefly, the microdropping technology is based on the use of a paste prepared with nanopowders of different ceramic oxides, previously stabilized and having already incorporated the catalytic element, if needed.…”

Section: Basno 3 Gas Sensing Film Preparationmentioning

confidence: 99%

High-temperature low-power performing micromachined suspended micro-hotplate for gas sensing applications

Belmonte

Puigcorbé

Arbiol

et al. 2006

Sensors and Actuators B: Chemical

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Section: Basno 3 Gas Sensing Film Preparationmentioning

confidence: 99%

High-temperature low-power performing micromachined suspended micro-hotplate for gas sensing applications

Belmonte

Puigcorbé

Arbiol

et al. 2006

Sensors and Actuators B: Chemical

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“…In the form of thin films, this oxide shows transparency about 80-90 % in the visible range and high reflectivity in the infrared [4][5][6]. Tin dioxide presents several technological applications such as photothermal converser of solar energy [7], gas sensors [8][9][10][11][12], optoelectronic devices [13] and others. SnO 2 thin films deposited through humid routes (solgel) present some electric instability due to deposition process conditions and sample configuration.…”

Section: Introductionmentioning

confidence: 99%

Improved electrical transport in lightly Er-doped sol–gel spin-coating SnO2 thin films, processed by photolithography

2014

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Sol-gel spin-coating SnO 2 thin films were deposited and processed through positive photolithography (liftoff), avoiding surface interaction with gaseous oxygen species and leading to samples with higher stability and data reproducibility, when submitted to electrical characterization. Processing includes: (1) a narrow conduction channel, (2) the assembly of electric contacts by ultrasound soldering, (3) deposition of an insulating layer, preventing the surface contact with atmospheric oxygen, which contributes for reliable measurements and the possibility of measuring SnO 2 matrix properties without influence of adsorbed oxygen. Lightly Er-doped SnO 2 sample (0.05 at.%), processed by this manner, has allowed the observation of a maximum about 50 K, in the temperaturedependent resistivity curve, which has not been found previously. This result is probably related to the combination of free electron concentration, which grows with temperature, and the grain boundary scattering, which decreases with temperature, and is the dominant mechanism for sol-gel SnO 2 . The processing also assures a remarkable reproducibility in the decay of photo-induced conductivity, yielding reliability to apply a modeling for the determination of important decay parameters, such as capture energy and grain boundary potential barrier.

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“…2,3 Its high transparency in the visible range, mainly in the form of thin films, [4][5][6] has motivated wide investigation with growing interest for applications in devices based on transparent semiconductors. This oxide also presents applications in other fields such as photothermal converters for solar cells, 7 gas sensors, [8][9][10][11][12] opto-electronic devices, 13 among others. The transparency of SnO 2 may be combined with the emission of rare-earth ions.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle characterization of Er-doped SnO2 pellets obtained with different pH of colloidal suspension

Ravaro¹,

Scalvi

Tabata

et al. 2013

Journal of Applied Physics

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SnO 2 :2 at. %Er xerogel samples were obtained by sol-gel technique from colloidal suspensions with distinct pHs. The evaluation of critical regions inside the nanocrystallite is fundamental for the interpretation of the influence of pH on the emission data. In this way, the nanocrystal depletion layer thickness was obtained with the help of photoluminescence, Raman, X-ray diffraction, and field-emission gun scanning electron microscopy measurements. It was observed that acid suspensions (pH < 7) lead to high surface disorder in which a larger number of cross-linked bonds Sn-O-Sn among nanoparticles are present. For these samples, the nanoparticle depletion layer is larger as compared to samples obtained from other pH. Photoluminescence measurement in the near infrared region indicates that the emission intensity of the transition 4 I 13/2 ! 4 I 15/2 is also influenced by the pH of the starting colloidal suspension, generating peaks more or less broadened, depending on location of Er 3þ ions in the SnO 2 lattice (high or low symmetry sites). V C 2013 AIP Publishing LLC. [http://dx

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Selectivity enhancement of SnO2 gas sensors: simultaneous monitoring of resistances and temperatures

Cited by 59 publications

References 1 publication

High-temperature low-power performing micromachined suspended micro-hotplate for gas sensing applications

High-temperature low-power performing micromachined suspended micro-hotplate for gas sensing applications

Improved electrical transport in lightly Er-doped sol–gel spin-coating SnO2 thin films, processed by photolithography

Nanoparticle characterization of Er-doped SnO2 pellets obtained with different pH of colloidal suspension

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