期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 47, 期 6, 页码 662-667出版社
WILEY-BLACKWELL
DOI: 10.1002/jrs.4879
关键词
surface-enhanced Raman scattering; large-size; silver nanoparticles; seed-mediated method; Rhodamine 6G
类别
资金
- NSFC [21522508, 21427813]
- Thousand Youth Talents Plan of China
- Fundamental Research Funds for Xiamen University
- NFFTBS [J1310024]
Silver nanoparticles (Ag NPs) enjoy a reputation as an ultrasensitive substrate for surface-enhanced Raman spectroscopy (SERS). However, large-scale synthesis of Ag NPs in a controlled manner is a challenging task for a long period of time. Here, we reported a simple seed-mediated method to synthesize Ag NPs with controllable sizes from 50 to 300 nm, which were characterized by scanning electron microscopy (SEM) and UV-Vis spectroscopy. SERS spectra of Rhodamine 6G (R6G) from the as-prepared Ag NPs substrates indicate that the enhancement capability of Ag NPs varies with different excitation wavelengths. The Ag NPs with average sizes of similar to 150, similar to 175, and similar to 225nm show the highest SERS activities for 532, 633, and 785-nm excitation, respectively. Significantly, 150-nm Ag NPs exhibit an enhancement factor exceeding 108 for pyridine (Py) molecules in electrochemical SERS (EC-SERS) measurements. Furthermore, finite-difference time-domain (FDTD) calculation is employed to explain the size-dependent SERS activity. Finally, the potential of the as-prepared SERS substrates is demonstrated with the detection of malachite green. Copyright (C) 2016 John Wiley & Sons, Ltd.
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