Desorption of carbon dioxide from small potassium niobate particles induced by the particles’ ferroelectric transition

Ramos-Moore, E.; Baier-Saip, J.A.; Cabrera, A. L.

doi:10.1016/j.susc.2006.06.037

Cited by 26 publications

(8 citation statements)

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“…Thin metal or oxide overlayers do not influence much this polarization-induced chemical or photochemical activity 27 . Polarization specific experiments are reported since a few years only, such as the reduction of Ag + on P (+) areas together with Pb 2+ oxidation to Pb 4+ on P (−) areas of BaTiO 3 27 , reduction of Ag from AgNO 3 on P (+) areas of PZT 28 29 , faster desorption of CO 2 from P (−) areas of BaTiO 3 and PZT 30 , similar results with stronger desorption of simple organic polar molecules from P (−) faces of KNbO 3 27 (also strongly enhanced at the FE → PE transition 31 ) and LiNbO 3 32 33 34 35 , and the preferential adsorption of polar contaminants on P (+) areas of PZT 36 . If the polarization state of the ferroelectric surface is found to influence strongly the adsorption/desorption kinetics and possibly the surface chemical reactions, the reverse is also valid, i.e.…”

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confidence: 63%

Ferroelectric triggering of carbon monoxide adsorption on lead zirco-titanate (001) surfaces

Tănase

Apostol

Abramiuc

et al. 2016

Sci Rep

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Atomically clean lead zirco-titanate PbZr0.2Ti0.8O3 (001) layers exhibit a polarization oriented inwards P(−), visible by a band bending of all core levels towards lower binding energies, whereas as introduced layers exhibit P(+) polarization under air or in ultrahigh vacuum. The magnitude of the inwards polarization decreases when the temperature is increased at 700 K. CO adsorption on P(−) polarized surfaces saturates at about one quarter of a monolayer of carbon, and occurs in both molecular (oxidized) and dissociated (reduced) states of carbon, with a large majority of reduced state. The sticking of CO on the surface in ultrahigh vacuum is found to be directly related to the P(−) polarization state of the surface. A simple electrostatic mechanism is proposed to explain these dissociation processes and the sticking of carbon on P(−) polarized areas. Carbon desorbs also when the surface is irradiated with soft X-rays. Carbon desorption when the polarization is lost proceeds most probably in form of CO2. Upon carbon desorption cycles, the ferroelectric surface is depleted in oxygen and at some point reverses its polarization, owing to electrons provided by oxygen vacancies which are able to screen the depolarization field produced by positive fixed charges at the surface.

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confidence: 63%

Ferroelectric triggering of carbon monoxide adsorption on lead zirco-titanate (001) surfaces

Tănase

Apostol

Abramiuc

et al. 2016

Sci Rep

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“…Research based on LiNbO 3 and some other materials has shown strong evidence that the dipole moment of a polar molecule may interact with the electric polarization of some ferroelectric domains on the surface. [20][21][22] This interaction would then increase the strength of molecular adsorption on the material surface. Here, it is suggested that the acentric structure of -WO 3 plays an important role on the selective detection of acetone.…”

Section: Discussionmentioning

confidence: 99%

Nanosensor Device for Breath Acetone Detection

Wang¹,

Kalyanasundaram²,

Stanaćević³

et al. 2010

Sen Lett

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This paper describes a sensor nanotechnology suitable for non-invasive monitoring of a signaling gas, such as acetone, in exhaled breath. This is a nanomedicine tool comprised of a selective acetone nanoprobe working on the principle of ferroelectric poling sensing, and a microelectronics circuit for comparing the actual sensor signal to a predetermined threshold value, displaying the result using LED signals. This on/off type non-invasive diagnostics platform technology is based on nanotechnology, gives a fast response, it is simple to operate and inexpensive to manufacture, and may truly revolutionize personalized medicine.

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“…[3][4][5] In fact, the model does not consider relevant issues such as retention loss, charge injection, and depolarizing fields, which are mainly related with the presence of oxygen vacancies at the electrode/ferroelectric interfaces. 6,7 On the other hand, the manipulation of ferroelectric domains at the surface of thin films has also motivated several studies [8][9][10][11] that have explored surface reactivity for gas sensing and related applications. Among others, we can mention photochemical oxidation and reduction of ferroelectric domains, 12 surface potential screening due to gas adsorption, 11 modification of ferroelectric performance due to presence of oxygen vacancies, 13 and interstitial hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Raman and x-ray photoelectron spectroscopy study of ferroelectric switching in Pb(Nb,Zr,Ti)O3 thin films

Ramos-Moore

Ferrari

Díaz-Droguett

et al. 2012

Journal of Applied Physics

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The ferroelectric switching process in Pb(Nb,Zr,Ti)O 3 thin films was studied by performing Raman spectroscopy and x-ray photoelectron spectroscopy (XPS). Switching was achieved using a macroscopic polarization experiment above and below the Curie temperature. Two samples in opposite switching states were obtained and characterized in order to correlate both vibrational-bands distortions of the bulk and changes in the elemental states of the surface. We have assigned the symmetrical A 1 (2TO) (332 cm À1) and A 1 (3TO) (603 cm À1) vibrational modes to the ferroelectric phase. Their corresponding peaks-area showed symmetrical behavior when the sample was polarized in opposite directions, while the quantity of phonons associated to the ferroelectric phase was conserved. We found that binding energies in the XPS signals of the Ti 2p, Nb 3d, Zr 3d, and Pb 4f levels increased when comparing to the values found in a non-polarized sample. Moreover, a high population of oxygen vacancies diffused to the surface of the ferroelectric capacitor under the application of external electric fields. Our novel results show the correlation between vibrational and ferroelectric behaviors and highlight the possibility to perform in situ treatments to decrease the degradation of current technological capacitors. V

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Desorption of carbon dioxide from small potassium niobate particles induced by the particles’ ferroelectric transition

Cited by 26 publications

References 9 publications

Ferroelectric triggering of carbon monoxide adsorption on lead zirco-titanate (001) surfaces

Ferroelectric triggering of carbon monoxide adsorption on lead zirco-titanate (001) surfaces

Nanosensor Device for Breath Acetone Detection

Raman and x-ray photoelectron spectroscopy study of ferroelectric switching in Pb(Nb,Zr,Ti)O3 thin films

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