Temperature-Induced Stacking to Create Cu2O Concave Sphere for Light Trapping Capable of Ultrasensitive Single-Particle Surface-Enhanced Raman Scattering
Temperature-Induced Stacking to Create Cu2O Concave Sphere for Light Trapping Capable of Ultrasensitive Single-Particle Surface-Enhanced Raman Scattering
复制标题
温度诱导堆叠形成用于光捕获的 Cu2O 凹球，能够实现超灵敏单粒子表面增强拉曼散射
DOI：
10.1002/adfm.201801868
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发表时间：
2018-08-15
影响因子：
19
通讯作者：
Guo, Lin
中科院分区：
文献类型：
--
作者：
Li, Xiaoxia;Shang, Yang;Guo, Lin
具有“非对称中心”的碗状或凹状粒子的制备引起了人们的广泛关注，在这种粒子中，粒子内部发生了多次散射，光散射能力明显增强。然而，有限的模板种类，不可控的尺寸，如尺寸的纳米颗粒和复杂的生长过程中造成了严重的限制，具有所需的几何形状和它们的光捕获性能的凹颗粒的可重复的建设。本文首次提出了一种“温度诱导堆积”的方法来制备可控的Cu 2 O纳米球。在不同的反应温度下，F68胶束的聚集可以形成不同尺寸的胶束，并可以作为软模板对Cu 2 O微球的凹型结构进行调控。所制备的Cu 2 O凹球（CS）可作为单颗粒（SP）表面增强拉曼散射（Sers）基底，获得高重复性和一致性的拉曼光谱。Cu_2O CS独特的空腔结构有效地捕获了光，由于多次光散射，也增加了散射长度。Cu_2O CS的比表面积和电荷转移过程略有增加，表现出显著的单粒子Sers性能，具有超低的检测限（2 × 10 ~（-8）mol L ~（-1））和金属可比的增强因子（2.8 × 10 ~（-5））。
The fabrication of bowl or concave particles with "asymmetric centers" has drawn considerable attentions, in which multiple scattering occurs inside the particles and the ability of light scattering is distinctly enhanced. However, the limited variety of templates, the uncontrollable dimensions such as the size of concavity and the complex growth process have posed serious limitations to the reproducible construction of concave particles with desired geometries and their light-trapping properties. Herein, a "temperature-induced stacking" strategy is proposed to create controllable concavity Cu2O spheres for the first time. Different sizes of F68 micelles can be formed through aggregation under different reaction temperatures, which can serve as soft template to tailor concave geometries of Cu2O spheres. The as-prepared Cu2O concave sphere (CS) can serve as single-particle (SP) surface-enhanced Raman scattering (SERS) substrate for highly repeatable and consistent Raman spectra. The unique cavity of Cu2O CS entraps light effectively, which also enhances the scattering length owing to multiple light scattering. Combined with slightly increased surface area and charge-transfer process, Cu2O CS exhibits remarkable single-particle SERS performance, with an ultralow low detection limit (2 x 10(-8) mol L-1) and metal comparable enhancement factor (2.8 x 10(5)).