Speckled SiO2@Au Core–Shell Particles as Surface Enhanced Raman Scattering Probes
Speckled SiO2@Au Core–Shell Particles as Surface Enhanced Raman Scattering Probes
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DOI：
10.1007/s11468-012-9374-0
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发表时间：
2013-06
期刊：
影响因子：
3
通讯作者：
P. Khurana;S. Thatai;Peijie Wang;P. Lihitkar;Lisheng Zhang;Yan Fang;S. Kulkarni
中科院分区：
文献类型：
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作者：
P. Khurana;S. Thatai;Peijie Wang;P. Lihitkar;Lisheng Zhang;Yan Fang;S. Kulkarni
使用 3-氨基丙基三乙氧基硅烷分子对约 800 nm 尺寸的二氧化硅颗粒进行功能化，其上沉积有金颗粒（约 20 nm 尺寸）。所得颗粒似乎形成有斑点的 SiO2@Au 核壳颗粒。由于金纳米颗粒之间的纳米间隙，表面粗糙度以及热点导致结晶紫分子的拉曼信号增强约 3.2 × 107，单壁碳纳米管增强约 1.42 × 108。研究还发现，核壳粒子表面等离激元共振 (SPR) 附近的电磁激发比非共振 SPR 激发更有效。
Silica particles of ~800 nm size were functionalized using 3-amino propyl triethoxysilane molecules on which gold particles (~20 nm size) were deposited. The resulting particles appeared to form speckled SiO2@Au core–shell particles. The surface roughness, along with hot spots, due to nanogaps between the gold nanoparticles was responsible for the enhancement of the Raman signal of crystal violet molecules by ~3.2 × 107and by ~1.42 × 108of single-wall carbon nanotubes. It has also been observed that the electromagnetic excitation near surface plasmon resonance (SPR) of core–shell particles is more effective than off resonance SPR excitation.