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High‐Yield Synthesis of Hollow Octahedral Silver Nanocages with Controllable Pack Density and Their High‐Performance Sers Application
Author(s) -
Huang Fengqin,
Ma Guanshui,
Liu Juzhe,
Lin Jie,
Wang Xiaotian,
Guo Lin
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201602280
Subject(s) - nanocages , materials science , rhodamine 6g , nanoparticle , scanning electron microscope , octahedron , nanotechnology , yield (engineering) , chemical engineering , raman scattering , transmission electron microscopy , raman spectroscopy , molecule , crystallography , chemistry , organic chemistry , composite material , catalysis , optics , physics , crystal structure , engineering
Nanoparticle‐assembled octahedral Ag nanocages with sharp edges have been successfully synthesized through a Cu 2 O‐based template‐assisted strategy. In the reaction system, Ag nanoparticles can be self‐assembled on the surface of Cu 2 O octahedrons, which is accomplished by the reduction of Ag + by NaBH 4 in the presence of sodium citrate as a capping agent. The hollow octahedral Ag nanocages are obtained after removing the inner Cu 2 O cores with acetic acid. According to the scanning electron microscopy (SEM) and transmission electron microscopy characterization, the Ag nanocages are weaved by small nanoparticles, the rough surfaces are bestrewed with pores and sharp edges. It is found that the pack density of Ag nanoparticles strongly affects the surface enhanced Raman scattering (SERS) activities. The as‐prepared 1.05‐Ag cages with optimal pack density have suitable interparticle distance and suitable size of pores, which significantly enhance SERS signals. The SERS signals of rhodamine 6G (R6G) molecules can be detected at an ultralow concentration of 10 −14 m when 1.05‐Ag cages are used as substrates. In addition to sensitivity, 1.05‐Ag cages also exhibit good reproducibility. It is expected that the ultrahigh sensitivity will endow the Ag nanocages to become a promising candidate as high‐performance SERS‐based chemical sensor.