Creation and Reconstruction of Thermochromic Au Nanorods with Surface Concavity
Creation and Reconstruction of Thermochromic Au Nanorods with Surface Concavity
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DOI：
10.1021/jacs.1c07241
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发表时间：
2021-09-29
影响因子：
15
通讯作者：
Yin, Yadong
中科院分区：
文献类型：
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作者：
Li, Zhiwei;Zhang, Jian;Yin, Yadong
由于热力学的偏好，传统的胶体合成通常会产生具有正曲率的纳米结构。在这里，我们演示了在受限空间中通过种子介导的生长在Au纳米棒中产生表面凹陷，并报告了它们对温度变化的热致变色响应。这种独特的表面凹陷是通过以Fe3O4纳米棒为模板创建的，产生了一种新的凹陷敏感的等离子体带。由于具有较高的表面能，亚稳态纳米棒可以在中等温度下重建，通过在不同的溶剂中老化来方便和精确地调节其等离子体性质。这种凹形Au纳米棒的结构重建使热致变色等离子体膜的制造成为可能，该热致变色等离子体膜可以显示具有鲜明颜色变化的图像或在老化时显示加密的、不可见的信息。这种模板策略在制造凹面纳米结构方面是通用的，这可能会为设计新的纳米结构打开大门，这些结构在传感、反伪造、信息加密和显示方面具有广阔的应用前景。
Conventional colloidal syntheses typically produce nanostructures with positive curvatures due to thermodynamic preference. Here, we demonstrate the creation of surface concavity in Au nanorods through seed-mediated growth in confined spaces and report their thermochromic responses to temperature changes. The unique surface concavity is created by templating against Fe3O4 nanorods, producing a new concavity-sensitive plasmonic band. Due to the high surface energy, the metastable nanorods can be reconstructed at a moderate temperature, enabling convenient and precise tuning of their plasmonic properties by aging in different solvents. Such structural reconstruction of concave Au nanorods enables the fabrication of thermochromic plasmonic films that can display images with vivid color changes or exhibit encrypted, invisible information upon aging. This templating strategy is universal in creating concave nanostructures, which may open the door to designing new nanostructures with promising applications in sensing, anticounterfeiting, information encryption, and displays.