Chemical diffusion of oxygen in tin dioxide

Kamp, B.; Merkle, Rotraut; Maier, Joachim

doi:10.1016/s0925-4005(01)00694-3

Cited by 77 publications

(55 citation statements)

References 16 publications

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“…XPS spectra were acquired at a constant pass energy of 20 eV using an un-monochromated MgKa (1253.6 eV) source operated at 12.5 kV and 20 mA and a detection angle of 30 with respect to the sample normal on grounded conducting substrates. The binding energies quoted are referred to the Au 4f 7/2 emission at 84.0 eV.…”

Section: Methodsmentioning

confidence: 99%

“…14, 30 The thermionic contribution to conductivity would not be strongly modified as long as barrier heights remain constant, as XPS results indicate, but the thermionicfield emission contribution would be especially affected as tunneling depends on both height and width of the barriers. As temperature is raised, oxygen diffuses out of the sample increasing the donor density, because oxygen vacancies are the dominating donor.…”

Section: à2mentioning

confidence: 99%

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Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

Schipani

Ponce

Joanni

et al. 2014

Journal of Applied Physics

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Studies of ambient dependent electrical behavior of nanocrystalline SnO 2 thin films using impedance spectroscopy J. Appl. Phys. 87, 7457 (2000); 10.1063/1.373010Dependence of indium-tin-oxide work function on surface cleaning method as studied by ultraviolet and x-ray photoemission spectroscopies J. Appl. Phys. 87, 295 (2000); 10.1063/1.371859Photoemission study of the interface between phenyl diamine and treated indium-tin-oxide Appl. Phys. Lett. 75, 1357Lett. 75, (1999 Changes in the concentration of oxygen vacancies within the grains of polycrystalline SnO 2 , due to different atmosphere exposures, were detected using impedance and photoemission spectroscopies. From measured capacitance values, variations of the potential barrier widths could be determined. It is shown that under the presence of an oxygen rich atmosphere, at relatively low temperature, the width of intergranular potential barriers increase to the point that grains become completely depleted of carriers. With subsequent exposure to vacuum, capacitance adopts a higher value, indicative of intergranular barriers and quasi-neutral regions at the center of the grains. X-ray and ultraviolet photoemission spectroscopy measurements showed that SnO 2 samples treated in oxidizing or reducing environments have similar barrier heights and different work functions. Results are especially relevant in the study of mechanisms responsible for metal oxide gas sensing. V C 2014 AIP Publishing LLC.[http://dx

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Section: Methodsmentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

Schipani

Ponce

Joanni

et al. 2014

Journal of Applied Physics

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“…Observase das micrografias que as partículas são relativamente isotrópicas, reforçando a hipótese do uso da Equação (A) para o cálculo das energias. A difusão intrínsica do SnO 2 foi calculada utilizando a expressão na Equação (D) com Tabela I -Temp indica a temperatura na qual a amostra foi tratada, S é a área específica do pó, H é a medida real de entalpia de dissolução por mergulho da amostra no solvente, S. temperatura igual a 500 o C (temperatura de tratamento dos nanopós) [33]:…”

Section: Energia De Superfície Do Sno 2 Dopadounclassified

Determinação das energias de superfície do SnO2 puro e dopado

Castro

Hidalgo²,

Gouvêa³

et al. 2009

Cerâmica

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INTRODUÇÃOO desenvolvimento de novos nanomateriais é fortemente dependente do controle da estabilização destas nanoestruturas. Quando considerando sínteses bottomtop, podem ser definidos dois métodos básicos de controle das nanoestruturas para gerar estabilização e indução de formatos e tamanhos desejados: o método termodinâmico e o cinético [1]. Particularmente centrando na síntese via líquida de nanopartículas, a aproximação termodinâmica considera que na nucleação existe um raio crítico mínimo relacionado com um balanço entre a energia de volume e a energia de superfície. Como fortemente dependente da energia de superfície, a modulação desta energia é indicada como uma forma natural de controle do tamanho mínimo das nanopartículas [1,2]. No entanto, após a nucleação, o fenômeno de crescimento ocorre espontaneamente, desde que existe uma barreira de energia para nuclear uma nova nanopartícula que, em geral, é maior que aquela para crescer a nanopartícula já nucleada. Para controlar este crescimento, adotam-se soluções usualmente cinéticas. No entanto, observando os modelos de crescimento de nanopartícula por síntese em fase líquida, verifica-se que a energia de superfície tem influência direta também no crescimento do tamanho da partícula em conjunto com o coeficiente de difusão. Isto é, para um processo controlado por difusão, o tamanho médio Mg, Fe, Cr, and Ni.

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“…B. Lit. [174,175]), da auf langen Zeitskalen kleine ¾nde-rungen des Sauerstoffgehalts doch möglich sind. [176] …”

Section: Wassereinbaureaktionunclassified

Wie wird Sauerstoff in Oxide eingebaut? Kinetische Studie einer “simplen” Feststoffreaktion am Modellmaterial SrTiO₃

Merkle

Maier

2008

Angewandte Chemie

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Die Kinetik der Stöchiometrieänderung eines Oxids – zugleich Beispiel einer (nominell) einfachen Festkörperreaktion und Grundlage vieler technisch relevanter Vorgänge – wird untersucht und im Detail analysiert. Als Modellreaktion wurde der Sauerstoffeinbau in Strontiumtitanat gewählt. Der gesamte Prozess kann von der Oberflächenreaktion bis hin zum Volumentransport phänomenologisch und mechanistisch verstanden werden. Schlüssel hierzu sind ein genaues Verständnis der Defektchemie des Perowskits wie auch die Anwendung einer Vielzahl experimenteller und theoretischer Methoden, die zum Teil eigens im Rahmen dieser Untersuchung entwickelt wurden. Die Bedeutung von Reaktions‐ und Transportschritten für (elektro)chemische Anwendungen wird herausgestellt.

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Chemical diffusion of oxygen in tin dioxide

Cited by 77 publications

References 16 publications

Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

Determinação das energias de superfície do SnO2 puro e dopado

Wie wird Sauerstoff in Oxide eingebaut? Kinetische Studie einer “simplen” Feststoffreaktion am Modellmaterial SrTiO₃

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Chemical diffusion of oxygen in tin dioxide

Cited by 77 publications

References 16 publications

Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

Determinação das energias de superfície do SnO2 puro e dopado

Wie wird Sauerstoff in Oxide eingebaut? Kinetische Studie einer “simplen” Feststoffreaktion am Modellmaterial SrTiO3

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Wie wird Sauerstoff in Oxide eingebaut? Kinetische Studie einer “simplen” Feststoffreaktion am Modellmaterial SrTiO₃