The determining effect of ultralow metal addition on the response of semiconductor gas sensors

Gutman, E. E.; Ryabtsev, S. V.; Kazachkov, E. A.; Герасимов, М. В.

doi:10.1016/0925-4005(93)85206-p

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…The electron transfer could be driven by different mechanisms concerning the reactions between metal nanoparticles and ZnO at the interface, although the details are complex. For example, water (moisture) splitting on a ZnO substrate coated with a submonolayer Ti, especially under the excitation by a UV laser, can attract free electrons to the surface of ZnO and consume them there to generate H 2 while leaving the OH − and/or O 2− on the surface 18. Such free electron transfer can flatten the upward band‐bending and weaken the surface electric field of ZnO.…”

Section: Resultsmentioning

confidence: 99%

Metal‐nanoparticle‐coating‐induced enhancement and weakening of resonant Raman scattering in ZnO: effect of surface electric field

Liu

Huang

Tripathy

et al. 2011

J Raman Spectroscopy

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Effects of Ag and Ti nanoparticle coatings on resonant Raman scattering in various ZnO thin films are presented. The longitudinal optical (LO) phonons, irrespective of the ZnO quality, exhibit an enhancement and a weakening by the Ag and Ti nanoparticle coatings, respectively. The enhancement (weakening) is always accompanied by a reduced (an increased) intensity ratio of the second to first-order LO phonons, which can be associated with changes in the electron-phonon coupling strength in the probed area of ZnO. Angle-resolved X-ray photoelectron spectroscopy provides evidence for the bending of the surface energy bands and their changes induced by the metal coatings. The effect of metal nanoparticle coatings on the Raman scattering of ZnO is thus attributed to the changes in the surface electric field.

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Section: Resultsmentioning

confidence: 99%