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Temperature‐Induced Stacking to Create Cu 2 O Concave Sphere for Light Trapping Capable of Ultrasensitive Single‐Particle Surface‐Enhanced Raman Scattering
Author(s) -
Li Xiaoxia,
Shang Yang,
Lin Jie,
Li Anran,
Wang Xiaotian,
Li Bin,
Guo Lin
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201801868
Subject(s) - materials science , scattering , raman scattering , particle (ecology) , stacking , spheres , light scattering , trapping , substrate (aquarium) , molecular physics , nanotechnology , raman spectroscopy , optics , physics , ecology , oceanography , nuclear magnetic resonance , astronomy , biology , geology
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 Cu 2 O 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 Cu 2 O spheres. The as‐prepared Cu 2 O 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 Cu 2 O 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, Cu 2 O CS exhibits remarkable single‐particle SERS performance, with an ultralow low detection limit (2 × 10 −8 mol L −1 ) and metal comparable enhancement factor (2.8 × 10 5 ).