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Gold nanonails for surface-enhanced infrared absorption.
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-06-15 , DOI: 10.1039/d0nh00244e Hang Yin 1 , Nannan Li , Yubing Si , Han Zhang , Baocheng Yang , Jianfang Wang
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-06-15 , DOI: 10.1039/d0nh00244e Hang Yin 1 , Nannan Li , Yubing Si , Han Zhang , Baocheng Yang , Jianfang Wang
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Surface-enhanced infrared absorption (SEIRA) can dramatically enhance the vibrational signals of analyte molecules owing to the interaction between plasmons and molecular vibrations. It has huge potential for applications in various detection and diagnostic fields. High-aspect-ratio rod-like metal nanostructures have been the most widely studied nanomaterials for SEIRA. However, nearly all of the rod-like nanostructures reported previously are fabricated using physical methods. They suffer from damping and low areal number densities. In this work, high-aspect-ratio Au nanorods are synthesized, and Au nanonails are prepared through Au overgrowth on the as-prepared Au nanorods. The aspect ratios of the Au nanorods and nanonails can be varied in the range of ∼10 to ∼60, and their longitudinal dipolar plasmon resonance wavelengths can be correspondingly tailored from ∼1.6 to ∼8.3 μm. The Au nanonails exhibit superior SEIRA performance with 4-aminothiophenol used as the probe molecules. They are further used to detect the common biomolecule L-cysteine. Numerical simulations are further performed to understand the experimental results. They match well with the experimental observations, revealing the mechanism of the SEIRA enhancement. Our study demonstrates that colloidal high-aspect-ratio Au nanonails and nanorods can function as SEIRA nanoantennas for highly sensitive molecular detection in various situations.
中文翻译：
金纳米指甲用于表面增强的红外吸收。
由于等离激元与分子振动之间的相互作用，表面增强的红外吸收（SEIRA）可以显着增强分析物分子的振动信号。它在各种检测和诊断领域的应用具有巨大的潜力。高纵横比的棒状金属纳米结构已成为SEIRA研究最广泛的纳米材料。然而，先前报道的几乎所有棒状纳米结构都是使用物理方法制造的。它们遭受阻尼和低面数密度的困扰。在这项工作中，合成了高纵横比的金纳米棒，并通过在所制备的金纳米棒上过度生长金制备金纳米钉。金纳米棒和纳米指甲的长宽比可在约10至约60的范围内变化，它们的纵向偶极等离子体激元共振波长可以相应地调整为约1.6至8.3μm。以4-氨基硫酚为探针分子，Au纳米指甲表现出优异的SEIRA性能。它们还用于检测常见的生物分子L-半胱氨酸。进一步进行数值模拟以了解实验结果。它们与实验观察非常吻合，揭示了SEIRA增强的机制。我们的研究表明，胶体高纵横比的金纳米钉和纳米棒可以用作SEIRA纳米天线，用于在各种情况下进行高灵敏度的分子检测。
更新日期：2020-07-27
中文翻译：
金纳米指甲用于表面增强的红外吸收。
由于等离激元与分子振动之间的相互作用，表面增强的红外吸收（SEIRA）可以显着增强分析物分子的振动信号。它在各种检测和诊断领域的应用具有巨大的潜力。高纵横比的棒状金属纳米结构已成为SEIRA研究最广泛的纳米材料。然而，先前报道的几乎所有棒状纳米结构都是使用物理方法制造的。它们遭受阻尼和低面数密度的困扰。在这项工作中，合成了高纵横比的金纳米棒，并通过在所制备的金纳米棒上过度生长金制备金纳米钉。金纳米棒和纳米指甲的长宽比可在约10至约60的范围内变化，它们的纵向偶极等离子体激元共振波长可以相应地调整为约1.6至8.3μm。以4-氨基硫酚为探针分子，Au纳米指甲表现出优异的SEIRA性能。它们还用于检测常见的生物分子L-半胱氨酸。进一步进行数值模拟以了解实验结果。它们与实验观察非常吻合，揭示了SEIRA增强的机制。我们的研究表明，胶体高纵横比的金纳米钉和纳米棒可以用作SEIRA纳米天线，用于在各种情况下进行高灵敏度的分子检测。
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