Photo-switchable Faraday Effect in EuS-Au Nanosystems
Photo-switchable Faraday Effect in EuS-Au Nanosystems
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EuS-Au 纳米系统中的光切换法拉第效应
DOI：
10.1002/pssa.201532526
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Y. Hasegawa
中科院分区：
文献类型：
--
作者：
A. Kawashima;T. Nakanishi;Y. Kitagawa;K. Fushimi;Y. Hasegawa
展示了使用二硫醇（DDT：1,10-癸二硫醇）联合分子（EuS-Au 纳米系统）的有效光开关硫化铕纳米晶体和金纳米粒子。 TEM 图像显示由立方体 EuS 纳米晶体和球形 Au 纳米颗粒组成的 EuS-Au 纳米系统的形成。在可见光照射下，观察到EuS-Au纳米系统在600 nm左右的吸收带发生剧烈变化。使用磁圆二色性 (MCD) 测量来估计 EuS-Au 纳米系统的法拉第效应。首次成功观察到可见光照射下EuS-Au纳米体系MCD光谱在670nm附近的有效变化。还给出了 MCD 光谱随可见光（>440nm）和暗光交替照射周期的有效可逆变化。 EuS-Au纳米体系在670nm处旋转角的下降率大于吸光度的下降率。这些结果表明，EuS-Au 纳米系统的 MCD 光谱的有效变化不仅取决于与 Au 纳米颗粒增强的局域表面等离子体共振相关的吸收带的剧烈变化，而且还取决于辐照下纳米系统中 EuS 和 Au 之间的特异性相互作用。EuS-Au 纳米系统的光开关和 TEM 图像图。
Effective photoswitchable europium sulfide nanocrystals with gold nanoparticles using dithiol (DDT: 1,10‐decanedithiol) joint molecules, EuS–Au nanosystems, are demonstrated. The TEM image indicates the formation of EuS–Au nanosystems composed of cube‐shaped EuS nanocrystals and spherical Au nanoparticles. Under visible‐light irradiation, a drastic change of absorption band of EuS–Au nanosystems at around 600 nm was observed. The Faraday effects of EuS–Au nanosystems were estimated using magnetic circular dichroism (MCD) measurements. The effective change of the MCD spectra of EuS–Au nanosystems under visible‐light irradiation was successfully observed at around 670 nm for the first time. The effective reversible changes in MCD spectra with the alternative irradiation cycles of visible light (>440 nm) and dark are also presented. The decrease rate of rotation angle at 670 nm of EuS–Au nanosystems is larger than that of absorbance. These results indicate that the effective change of MCD spectra of EuS–Au nanosystems would be dominated not only by a drastic change of absorption band related to enhanced LSPR of Au nanoparticles but also by specific interaction between EuS and Au in nanosystem under irradiation.Illustration of photoswitch and TEM image of EuS–Au nanosystems.