Photo-Induced Reaction of Ethene Bound to Vanadia Nanoparticles [(V2O5)nOC2H4– (n = 2–20)] in the Gas Phase

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• 作者：Qing-Yu Liu ; Zhen Yuan ; Yan-Xia Zhao ; Sheng-Gui He
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：August 4, 2016
• 年：2016
• 卷：120
• 期：30
• 页码：17081-17086
• 全文大小：377K
• 年卷期：0
• ISSN：1932-7455

文摘

Photoinduced reactions of ethene (C₂H₄) bound to vanadium oxide nanoparticles (V₂O₅)_nO^– (n = 2–20) have been studied via a high-resolution tandem time-of-flight mass spectrometer coupled with a nanosecond ultraviolet laser system. Two major reaction channels, C₂H₄O₂ elimination and photoelectron detachment, have been observed for all the examined cluster systems. As the cluster size increases, the efficiency of photoreaction increases. Kinetic analysis demonstrates that the C₂H₄O₂ is generated by a single-photon absorption process (V₂O₅)_nOC₂H₄^– + hυ (first photon) → (V₂O₅)_n-1V₂O₄^– + C₂H₄O₂, which is followed by the photoelectron detachment (V₂O₅)_n-1V₂O₄^– + hυ (second photon) → (V₂O₅)_n-1V₂O₄ + e^–. The fast dissociation to generate C₂H₄O₂ within about 5 ns after absorption of a single photon demonstrates that the electron instead of phonon should be the energy carrier for photoreaction on the studied semiconducting nanoparticles as large as V₄₀O₁₀₁ (diameter around 1.5 nm).