Femtosecond Laser Near-Field Reduction for Fabrication of 3D Gold Nanocluster Array Assisted by MoS2 Quantum Dots
Femtosecond Laser Near-Field Reduction for Fabrication of 3D Gold Nanocluster Array Assisted by MoS2 Quantum Dots
复制标题
DOI：
10.3389/fphy.2022.917006
复制
发表时间：
2022-05
期刊：
影响因子：
--
通讯作者：
Shi Bai;K. Obata;K. Sugioka
中科院分区：
文献类型：
--
作者：
Shi Bai;K. Obata;K. Sugioka
激光诱导近场效应将激光能量限制在纳米尺度范围内，使激光加工的分辨率远小于波长。激光诱导近场加工技术由于其高的加工分辨率，作为表面纳米结构化的一种手段，引起了人们的广泛关注。在这份报告中，我们介绍了一种新的方法的基础上，激光诱导近场减少使用飞秒激光，金纳米团簇阵列形成的自组装二氧化硅微球的辅助下，在衬底上。在激光近场还原中，入射激光聚焦在二氧化硅微球的背面附近以引发金纳米颗粒的合成，随后通过金纳米颗粒沿着二氧化硅微球表面连续生长来产生金纳米簇。此外，激光处理的MoS2量子点混合在金前体中，以增加球形金纳米团簇形成的还原效率。金纳米团簇阵列为等离子体器件提供了潜在的应用。
Laser-induced near-field effect, which confines the laser energy in a nano scale region to be enhanced, allows the laser fabrication with a resolution much smaller than the wavelength. Owing to such a high fabrication resolution, the laser-induced near-field fabrication has been attracting much attention as a tool for the surface nanostructuring. In this report, we introduce a novel method based on the laser-induced near-field reduction using a femtosecond laser by which gold nanocluster arrays are formed on substrates with the assistance of self-assembled silica microspheres. In the laser near-field reduction, the incident laser is focused in the vicinity of the backside of the silica microspheres to initiate synthesis of gold nanoparticles, followed by creation of gold nanoclusters by continuous growth of the gold nanoparticles along the silica microsphere surfaces. In addition, laser-treated MoS2 quantum dots are mixed in the gold precursor to increase the reduction efficiency for the formation of spherical gold nanoclusters. The gold nanocluster arrays provide potential applications for plasmonic devices.