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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Identification at the Single Molecule Level of C2H_X Moieties Derived from Acetylene on the Pt(111) Surface
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Identification at the Single Molecule Level of C2H_X Moieties Derived from Acetylene on the Pt(111) Surface

机译:在Pt(111)表面上源自乙炔的C2H_X部分的单分子水平鉴定

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摘要

A low-temperature scanning tunneling microscope operated at 4.7 K was used to observe individual molecules produced from the thermal decomposition and hydrogenation reactions of acetylene on the Pt(111) surface. Acetylene molecules observed on the surface following adsorption at 50 K are seen to persist up to room temperature at the same time as two other moieties are observed to form. One moiety greatly increases in amount when the acetylene is coadsorbed with hydrogen and is attributed to the vinyl species, HCCH2, in agreement with a recent study using reflection absorption infrared spectroscopy. A third species observed at room temperature is identified as vinylidene, CCH2. The identification of these species is aided by using voltage pulses from the STM to further decompose them into species containing fewer atoms. Ethylidyne, CCH3, is identified after heating the surface to 400 K and was confirmed by comparison to results obtained following ethylene adsorption. Exposure of the surface held at 800 K to acetylene produced C2 molecules on the surface, which could be subsequently hydrogenated to ethylidyne. The hydrogenation of residual surface carbon also leads to the formation of ethylidyne, suggesting that the residual carbon was in the form of C2 molecules rather than carbon atoms.
机译:使用在4.7 K下运行的低温扫描隧道显微镜观察由乙炔在Pt(111)表面上的热分解和氢化反应产生的单个分子。在观察到另外两个部分形成的同时,观察到在50 K吸附后在表面上观察到的乙炔分子可以持续到室温。当乙炔与氢共吸附时,一个部分的数量会大大增加,这归因于乙烯基物质HCCH2,这与最近使用反射吸收红外光谱法进行的研究一致。在室温下观察到的第三种被鉴定为亚乙烯基,CCH 2。通过使用来自STM的电压脉冲将它们进一步分解为包含较少原子的物种,可以帮助识别这些物种。在将表面加热至400 K后,鉴定出乙炔CCH3,并通过与乙烯吸附后得到的结果进行比较来确认。保持在800 K的表面暴露于乙炔会在表面上产生C2分子,随后可将其氢化为乙炔。残留表面碳的氢化还会导致乙炔的形成,这表明残留碳是以C2分子而不是碳原子的形式存在的。

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