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Colloid‐Interface‐Assisted Laser Irradiation of Nanocrystals Superlattices to be Scalable Plasmonic Superstructures with Novel Activities
Small ( IF 13.0 ) Pub Date : 2018-02-12 , DOI: 10.1002/smll.201703501 Liu Huang 1 , Xiaodong Wan 1 , Hongpan Rong 1 , Yuan Yao 2 , Meng Xu 1 , Jia Liu 1 , Muwei Ji 3 , Jiajia Liu 1 , Lan Jiang 4 , Jiatao Zhang 1
Small ( IF 13.0 ) Pub Date : 2018-02-12 , DOI: 10.1002/smll.201703501 Liu Huang 1 , Xiaodong Wan 1 , Hongpan Rong 1 , Yuan Yao 2 , Meng Xu 1 , Jia Liu 1 , Muwei Ji 3 , Jiajia Liu 1 , Lan Jiang 4 , Jiatao Zhang 1
Affiliation
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High‐efficient charge and energy transfer between nanocrystals (NCs) in a bottom‐up assembly are hard to achieve, resulting in an obstacle in application. Instead of the ligands exchange strategies, the advantage of a continuous laser is taken with optimal wavelength and power to irradiate the film‐scale NCs superlattices at solid–liquid interfaces. Owing to the Au‐based NCs' surface plasmon resonance (SPR) effect, the gentle laser irradiation leads the Au NCs or Au@CdS core/shell NCs to attach each other with controlled pattern at the interfaces between solid NCs phase and liquid ethanol/ethylene glycol. A continuous wave 532 nm laser (6.68–13.37 W cm−2), to control Au‐based superlattices, is used to form the monolayer with uniformly reduced interparticle distance followed by welded superstructures. Considering the size effect to Au NCs' melting, when decreasing the Au NCs size to ≈5 nm, stronger welding nanostructures are obtained with diverse unprecedented shapes which cannot be achieved by normal colloidal synthesis. With the help of facile scale‐up and formation at solid–liquid interfaces, and a good connection of crystalline between NCs, the obtained plasmonic superstructured films that could be facilely transferred onto different substrates exhibit broad SPR absorption in the visible and near‐infrared regime, enhanced electric conductivities, and wide applications as surface enhanced Raman scattering (SERS)‐active substrates.
中文翻译：
胶体界面辅助激光辐照的纳米晶体超晶格是具有新活动的可扩展等离子体超结构。
在自下而上的组件中，难以实现纳米晶体（NC）之间的高效电荷和能量转移，从而给应用带来障碍。代替配体交换策略，连续激光的优势在于具有最佳的波长和功率，以在固液界面上辐照薄膜级NC超晶格。由于基于金的NC的表面等离振子共振（SPR）效应，柔和的激光照射导致Au NC或Au @ CdS核/壳NC彼此以可控模式相互附着在固态NC相与液体乙醇/乙二醇。连续波532 nm激光（6.68–13.37 W cm -2）（用于控制Au基超晶格）用于形成均匀减小的粒子间距离的单层结构，然后焊接上层结构。考虑到尺寸对Au NCs熔化的影响，当将Au NCs的尺寸减小到≈5nm时，可以获得具有各种前所未有的形状的更强的焊接纳米结构，这是常规胶体合成无法实现的。借助在固-液界面上的容易放大和形成，以及NC之间良好的晶体连接，可以容易地转移到不同基底上的等离激元超结构膜在可见光和近红外条件下表现出广泛的SPR吸收，增强的电导率以及作为表面增强拉曼散射（SERS）活性基材的广泛应用。
更新日期：2018-02-12
中文翻译：
胶体界面辅助激光辐照的纳米晶体超晶格是具有新活动的可扩展等离子体超结构。
在自下而上的组件中，难以实现纳米晶体（NC）之间的高效电荷和能量转移，从而给应用带来障碍。代替配体交换策略，连续激光的优势在于具有最佳的波长和功率，以在固液界面上辐照薄膜级NC超晶格。由于基于金的NC的表面等离振子共振（SPR）效应，柔和的激光照射导致Au NC或Au @ CdS核/壳NC彼此以可控模式相互附着在固态NC相与液体乙醇/乙二醇。连续波532 nm激光（6.68–13.37 W cm -2）（用于控制Au基超晶格）用于形成均匀减小的粒子间距离的单层结构，然后焊接上层结构。考虑到尺寸对Au NCs熔化的影响，当将Au NCs的尺寸减小到≈5nm时，可以获得具有各种前所未有的形状的更强的焊接纳米结构，这是常规胶体合成无法实现的。借助在固-液界面上的容易放大和形成，以及NC之间良好的晶体连接，可以容易地转移到不同基底上的等离激元超结构膜在可见光和近红外条件下表现出广泛的SPR吸收，增强的电导率以及作为表面增强拉曼散射（SERS）活性基材的广泛应用。
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