光谱学证据表明，由于在金表面的光切换单层功函数的改变

IF 2.781 The Journal of Physical Chemistry Pub Date : 2013-09-11 DOI:10.1021/JP405710U

Matthew A. Bartucci, J. Florián, J. Ciszek

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引用次数: 9

摘要

利用表面对界面偶极子的响应，一类光发色团(二氢吲哚嗪)被证明可以改变衬底的功函数(~ 170 meV)。这个分子还提供了光谱特征，将分子结构的变化与表面电子性质的诱导变化联系起来。偏振调制红外反射吸收光谱(PM-IRRAS)允许分析二氢吲哚嗪C = C (1559 cm-1)和吡啶(1643 cm-1)作为光激发函数的特征拉伸。该光发色团的结构分配得到密度函数理论计算的证实。单分子层的构象变化与功函数变化平行，且与功函数变化的速率和幅度一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Spectroscopic Evidence of Work Function Alterations Due to Photoswitchable Monolayers on Gold Surfaces

Taking advantage of surfaces’ response to interfacial dipoles, a class of photochromophores (dihydroindolizine) is demonstrated to alter the work function of the underlying substrate (∼170 meV). This same molecule also provides spectroscopic signatures for correlating the change in molecular structure to the induced change in the surfaces’ electronic properties. Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) allows analysis of the characteristic dihydroindolizine C═C (1559 cm–1) and pyridinium (1643 cm–1) stretch as a function of photoexcitation. Structural assignments of this photochromophore are corroborated to density function theory calculations. Conformational changes in the monolayers appear in parallel with work function changes and are consistent with both its rate and magnitude.

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The Journal of Physical Chemistry

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