Response to oxygen and chemical properties of SnO2 thin-film gas sensors

Adamowicz, B.; Izydorczyk, Weronika; Izydorczyk, Jacek; Klimasek, A.; Jakubik, W.; Żywicki, J.

doi:10.1016/j.vacuum.2008.01.003

Cited by 24 publications

(13 citation statements)

References 11 publications

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“…It is interesting to add that this characteristic seems to be system independent: it appears in all metal-oxide nanostructures found in literature. 23 In this sense, our samples are also characterized by PL measurements in order to provide additional confirmation of PC results. The PL data is depicted in Fig.…”

Section: Resultsmentioning

confidence: 86%

Semiconducting Sn3O4 nanobelts: Growth and electronic structure

Berengue

Simon

Chiquito

et al. 2010

Journal of Applied Physics

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The study of structures based on nonstoichiometric SnO 2−x compounds, besides experimentally observed, is a challenging task taking into account their instabilities. In this paper, we report on single crystal Sn 3 O 4 nanobelts, which were successfully grown by a carbothermal evaporation process of SnO 2 powder in association with the well known vapor-solid mechanism. By combining the structural data and transport properties, the samples were investigated. The results showed a triclinic semiconductor structure with a fundamental gap of 2.9 eV. The semiconductor behavior was confirmed by the electron transport data, which pointed to the variable range hopping process as the main conduction mechanism, thus giving consistent support to the mechanisms underlying the observed semiconducting character.

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Section: Resultsmentioning

confidence: 86%

Semiconducting Sn3O4 nanobelts: Growth and electronic structure

Berengue

Simon

Chiquito

et al. 2010

Journal of Applied Physics

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“…The acid pH also influences the expected effect of increasing particles size, which decreases the overall number of particles and then, contributes for the increase of the mobility as well. This influence is very important for the design of gas sensors 32,33 , where the basis of application is the modulation of electrical conductivity by adsorbed gaseous species.…”

Section: Low Temperature Electrical Characterization Of Thin Filmsmentioning

confidence: 99%

Influence of pH of colloidal suspension on the electrical conductivity of SnO2 thin films deposited via Sol-Gel-Dip-Coating

Ravaro

Scalvi

2011

Mat. Res.

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Tin dioxide (SnO 2 ) thin films are deposited by the dip-coating technique from colloidal suspensions prepared with distinct pH through the sol-gel method. The decrease of the pH contributes to the destruction of an electrical layer adjacent to particles in solution, leading to a high degree of aggregation among these particles due to the generation of cross-linked bonds (Sn-O-Sn) between them. The aggregation affects the electrical properties of films, because the pH variation produces particle with distinct sizes in the film. Undoped samples prepared from pH 6 leads to the highest conductivity among the investigated undoped samples, in agreement with X-ray diffractograms, which indicate higher crystallinity for lower pH. Arrhenius plot evaluated from temperature dependent conductivity data leads to activation energies of the deepest level between 67 to 140 meV, for the films prepared from suspensions with pH 6 to 11. The most probable explanation for this variation in the conductivity and activation energy is related to distinct potential barriers between grains, due to distinct packing caused by cross-linked bonds formed during suspension phase. Characterization of samples lightly doped with Er 3+ confirms that acid pH leads to higher conductivity, but the highest conduction takes place at even lower pH when compared to undoped thin films.

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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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Response to oxygen and chemical properties of SnO2 thin-film gas sensors

Cited by 24 publications

References 11 publications

Semiconducting Sn3O4 nanobelts: Growth and electronic structure

Semiconducting Sn3O4 nanobelts: Growth and electronic structure

Influence of pH of colloidal suspension on the electrical conductivity of SnO2 thin films deposited via Sol-Gel-Dip-Coating

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

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