Three-dimensional hotspots in evaporating nanoparticle sols for ultrahigh Raman scattering: solid-liquid interface effects

Nanoscale
Yudie SunJinhuai Liu

Abstract

Three-dimensional (3D) hotspots for ultrahigh surface-enhanced Raman scattering (SERS) has been experimentally demonstrated by evaporating a droplet of citrate-Ag sols on both hydrophobic and hydrophilic flat surfaces. Interestingly, the hydrophobic surface increased the Raman enhancement by two orders of magnitude and exhibits a better signal stability than the hydrophilic one. This study highlights the differences between hydrophilic and hydrophobic surfaces in enhanced Raman scattering by the use of extremely diluted rhodamine 6G (R6G) as the SERS reporter. In situ synchrotron-radiation small-angle X-ray scattering (SR-SAXS) was employed to explore the evolution of the 3D geometry of Ag nanoparticles in a single droplet and verify the influence mechanism of these two kinds of surface. The ideal situation of 3D self-assembly of nanoparticles in the evaporation process is a collaborative behaviour, but our results evidenced that a progressive 3D self-assembly of nanoparticles was more preferred due to the interface effects. Our experimental data derived from in situ SR-SAXS reveals that a truly distinct 3D geometry of the Ag particles develops during the evaporation process on both hydrophilic and hydrophobic surfaces. In this...Continue Reading

References

Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Hua Hu, Ronald G Larson
Oct 17, 2008·Small·Hyunhyub Ko, Vladimir V Tsukruk
May 29, 2010·Science·Jonathan A FanFederico Capasso
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Citations

Jul 24, 2015·ACS Applied Materials & Interfaces·Youju HuangDong-Hwan Kim
Mar 13, 2019·Electrophoresis·Yongkang WangYunfei Chen
Oct 16, 2018·Biomedical Optics Express·Yudong LuShangyuan Feng
Jun 28, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Yongkang WangYunfei Chen

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