Enhanced trans‐to‐cis photoisomerization quantum yield of azobenzene spatially confined in silver nanoparticle aggregates,Journal of Raman Spectroscopy

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Enhanced trans‐to‐cis photoisomerization quantum yield of azobenzene spatially confined in silver nanoparticle aggregates
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-02-05 , DOI: 10.1002/jrs.5847
Lili Sun ₁ , Changshun Wang ₁ , Yujia Pan ₁ , Tianyu Chen ₁ , Ziyao Lv ₁

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Photoisomerization of azobenzene spatially confined in silver nanoparticle (AgNP) aggregates and in ethanol solution was monitored by Raman spectroscopy inside optically clear colorimetric dishes. After ultraviolet irradiation, overall Raman intensity assigned to trans‐azobenzene of these two samples decreased, and notably, a cis peak appeared at 599 cm⁻¹, assigned to C─N═N─C torsional mode. The Raman intensity at 1,007 cm⁻¹, assigned to trans‐azobenzene, was recorded versus irradiation time for analyzing the trans‐to‐cis photoisomerization quantum yield (PQY). By combining our theoretical derivation and standard curve of Raman spectra, the trans‐to‐cis PQY of azobenzene in AgNP aggregates was roughly calculated to be 79.0% higher than that in ethanol solution. The enhancement mechanism was discussed in terms of the competition between enhanced local optical field from surface plasmon resonance and the accelerated nonradiative decay of excited azobenzene molecules together.

中文翻译：

在空间上限制在银纳米颗粒聚集体中的偶氮苯的反式至顺式光异构化量子产率

通过光学透明比色皿内的拉曼光谱法监测空间限制在银纳米颗粒（AgNP）聚集体和乙醇溶液中的偶氮苯的光异构化。紫外线照射后，分配给这两个样品的反式偶氮苯的总拉曼强度降低，尤其是在599 cm ^-1处出现一个顺式峰，归因于C ^‑ N peakN ^‑ C扭转模式。1,007 cm ^-1处的拉曼强度记录分配给反式偶氮苯的，与照射时间的关系，以分析反式至顺式光异构化量子产率（PQY）。通过结合我们的理论推导和拉曼光谱的标准曲线，可得出AgNP聚集体中偶氮苯的反式-顺式PQY值比乙醇溶液中的反式PQY值高出79.0％。从表面等离振子共振增强的局部光场与激发的偶氮苯分子加速的非辐射衰变之间的竞争来讨论增强机理。

更新日期：2020-02-05

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