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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >SERS of CO2 on Cold-Deposited Cu: An Electronic Effect at a Minority of Surface Sites
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SERS of CO2 on Cold-Deposited Cu: An Electronic Effect at a Minority of Surface Sites

机译:冷沉积铜上的二氧化碳SERS:在少数表面部位的电子效应

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摘要

We compare the results of surface enhanced Raman scattering (SERS) and infrared reflection absorption spectroscopy (IRRAS) of carbon dioxide (CO2) on cold-deposited copper films. The SERS spectra of CO2 on copper films deposited at 40 K display neutral species at SERS active sites with bands not observed by Raman spectroscopy of CO2 gas, but identical to the loss bands of gaseous CO2 in electron energy loss spectroscopy. The absence of one component of the Fermi doublet of CO2 in SERS proves that the local electromagnetic field enhancement at SERS active sites cannot deliver signals above the noise level. The activated anionic CO_2~- is observed by transient electron transfer from the anionic molecule to the copper metal at a subgroup of SERS active sites, which are annealed below 200 K. The IRRAS spectra show only the expected infrared (IR) active modes of neutral CO2 representing the "majority species" of adsorbed CO2.
机译:我们比较了冷沉积铜膜上二氧化碳(CO2)的表面增强拉曼散射(SERS)和红外反射吸收光谱(IRRAS)的结果。沉积在40 K的铜膜上的CO2的SERS光谱在SERS活性位点显示中性物种,其带未通过CO2气体的拉曼光谱法观察到,但与电子能量损失谱中的气态CO2的损失谱带相同。 SERS中不存在CO2费米二重峰的一种成分,这证明SERS活性位点的局部电磁场增强无法传递高于噪声水平的信号。通过在200 K以下退火的SERS活性位点亚组中,从阴离子分子到铜金属的瞬态电子转移,观察到了活化的阴离子CO_2〜-。IRRAS光谱仅显示中性的预期红外(IR)活性模式代表吸附的CO2的“多数种类”的CO2。

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