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Ordered Superparticles with an Enhanced Photoelectric Effect by Sub-Nanometer Interparticle Distance

机译：通过亚纳米级粒子间距离增强光电效应的有序超粒子

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摘要

As the development in self-assembly of nanoparticles, a main question is directed to whether the supercrystalline structure can facilitate generation of collective properties, such as coupling between adjacent nanocrystals or delocalization of exciton to achieve band-like electronic transport in a 3D assembly. The nanocrystal surfaces are generally passivated by insulating organic ligands, which block electronic communication of neighboring building blocks in nanoparticle assemblies. Ligand removal or exchange is an operable strategy for promoting electron transfer, but usually changes the surface states, resulting in performance alteration or uncontrollable aggregation. Here, 3D, supercompact superparticles with well-defined superlattice domains through a thermally controlled emulsion-based self-assembly method is fabricated. The interparticle spacing in the superparticles shrinks to approximate to 0.3 nm because organic ligands lie prone on the nanoparticle surface, which are sufficient to overcome the electron transfer barrier. The ordered and compressed superstructures promote coupling and electronic energy transfer between CdSSe quantum dots (QDs). Therefore, the acquired QD superparticles exhibit different optical properties and enhanced photoelectric activity compared to individual QDs.
机译：随着纳米粒子自组装的发展，主要问题是针对超晶结构是否可以促进集体性质的产生，例如相邻纳米晶体之间的偶联或激子的离域化，从而在3D组装中实现带状电子传输。纳米晶体表面通常被绝缘的有机配体钝化，该有机配体阻止了纳米颗粒组件中相邻构件的电子通信。配体的去除或交换是促进电子转移的可行策略，但通常会改变表面状态，从而导致性能改变或无法控制的聚集。在这里，通过基于热控制乳液的自组装方法，制造了具有明确定义的超晶格域的3D超紧凑超粒子。由于有机配体易于出现在纳米颗粒表面上，因此超颗粒中的颗粒间间距缩小至约0.3 nm，这足以克服电子传输壁垒。有序和压缩的上层建筑促进了CdSSe量子点（QD）之间的耦合和电子能量转移。因此，与单独的QD相比，获得的QD超粒子显示出不同的光学性能和增强的光电活性。

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  • 来源
    《Advanced Functional Materials》 |2017年第44期|1701982.1-1701982.9|共9页
  • 作者

    Luo Dan; Qin Xiaoyun; Song Qian; Qiao Xuezhi; Zhang Zhen; Xue Zhenjie; Liu Cong; Mo Guang; Wang Tie;

  • 作者单位

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|China Univ Petr, Inst New Energy, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing, Peoples R China;

    Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    electronic energy transfer; QD coupling; self-assembly; superparticles;

    机译：电子能量传递;量子点耦合;自组装;超粒子;

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