AN IR STUDY OF CO-SENSING MECHANISM ON AU/ZNO
AN IR STUDY OF CO-SENSING MECHANISM ON AU/ZNO
复制标题
DOI：
10.1016/0925-4005(95)85117-8
复制
发表时间：
1995-04-01
影响因子：
8.4
通讯作者：
HARUTA, M
中科院分区：
文献类型：
--
作者：
BOCCUZZI, F;CHIORINO, A;HARUTA, M
采用红外光谱和四极质量研究了CO在含O-16（2）和O-18（2）的Au/ZnO样品上的吸附和氧化。结果表明，CO吸附在与ZnO的周边界面处的金位点上，与氧化物表面的表面晶格氧反应，形成碳酸盐状中间体。该反应和中间体的分解可以被认为是主要负责由空气中的CO引起的金属氧化物的电导率变化。氧，存在于混合物中，并吸附在金邻位的网站上，使亲核攻击的CO上的表面氧更容易作为吸电子效应的结果。该效应通过诱导效应产生吸附的CO的碳的正化，并激活CO上的载体晶格氧的反应性。
An FTIR and quadrupole mass study of the adsorption and oxidation of CO on an Au/ZnO sample with O-16(2) and O-18(2) is presented. The results indicate that CO adsorbed on gold sites at the perimeter interface with ZnO reacts with surface lattice oxygens at the oxide surface to form carbonate-like intermediates. This reaction and the decomposition of the intermediates can be assumed to be mainly responsible for the conductivity changes of the semiconductive metal oxide caused by CO in air. Oxygen, present in the mixture and adsorbed on gold vicinal sites, makes the nucleophilic attack of surface oxygens on the CO easier as a consequence of an electron-withdrawing effect. This effect produces a positivization of the carbon of adsorbed CO by an inductive effect and activates the reactivity of support lattice oxygens on the CO.