State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China.
Nanoscale. 2017 Jun 29;9(25):8716-8722. doi: 10.1039/c7nr01966a.
The exploration of localized surface plasmon resonance (LSPR) beyond the usual visible waveband, for example within the ultraviolet (UV) or deep-ultraviolet (D-UV) regions, is of great significance due to its unique applications in secret communications and optics. However, it is still challenging to universally synthesize the corresponding metal nanostructures due to their high activity. Herein, we report a universal, eco-friendly, facile and rapid synthesis of various nano-metals encapsulated by ultrathin carbon shells, significantly with a remarkable deep-UV LSPR characteristic, via a liquid-phase laser fabrication method. Firstly, a new generation of the laser ablation in liquid (LAL) method has been developed with an emphasis on the elaborate selection of solvents to generate ultrathin carbon shells, and hence to stabilize the formed metal nanocrystals. As a result, a series of metal@carbon nanoparticles (NPs), including Cr@C, Ti@C, Fe@C, V@C, Al@C, Sn@C, Mn@C and Pd@C, can be fabricated by this modified LAL method. Interestingly, these NPs exhibit LSPR peaks in the range of 200-330 nm, which are very rare for localized surface plasmon resonance. Consequently, the UV plasmonic effects of these metal@carbon NPs were demonstrated both by the observed enhancement in UV photoluminescence (PL) from the carbon nanoshells and by the improvement of the photo-responsivity of UV GaN photodetectors. This work could provide a universal method for carbon shelled metal NPs and expand plasmonics into the D-UV waveband.
探索局域表面等离子体共振（LSPR）超出常见可见光波段的范围，例如在紫外线（UV）或深紫外线（D-UV）区域，具有重要的意义，因为它在秘密通信和光学方面具有独特的应用。然而，由于其高活性，普遍合成相应的金属纳米结构仍然具有挑战性。在此，我们通过液相激光制造方法报告了一种通用、环保、简便和快速的方法，用于合成各种被超薄碳壳包裹的纳米金属，显著具有显著的深紫外线 LSPR 特性。首先，我们开发了新一代的激光烧蚀在液体（LAL）方法，重点是精心选择溶剂以生成超薄碳壳，从而稳定形成的金属纳米晶体。结果，通过这种改进的 LAL 方法可以制造一系列金属@碳纳米粒子（NPs），包括 Cr@C、Ti@C、Fe@C、V@C、Al@C、Sn@C、Mn@C 和 Pd@C。有趣的是，这些 NPs 在 200-330nm 范围内表现出 LSPR 峰，这对于局域表面等离子体共振来说非常罕见。因此，通过观察到碳纳米壳中增强的紫外光荧光（PL）以及提高的 UV GaN 光电探测器的光响应性，证明了这些金属@碳 NPs 的 UV 等离子体效应。这项工作为碳壳金属 NPs 提供了一种通用方法，并将等离子体学扩展到 D-UV 波段。
