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May 13-14, 2019 | Prague, Czech Republic
Chemistry and Medicinal Chemistry
9
th
World Congress on
Asian Journal of Biomedical and Pharmaceutical Sciences | Volume 9
ISSN: 2249-622X
Hierarchical SERS substrate of Au Film over Nanosphere (AUFON) fabricated by Ion-
Beam Sputtering Deposition
Hong Wang
1
, Zongwei Xu
2
, Ying Song
2
, Liyang Wang
2
and
Zhen Yin
1
1
Tianjin Polytechnic University, China
2
Tianjin University, China
I
n this paper, basing on themethod of ion-beam sputtering
deposition and the self-assembly of polystyrene (PS)
colloidal spheres, the preparation and characterization
of Au film over nanosphere (AuFON) hierarchical Surface
Enhance Raman Scattering (SERS) substrate were studied.
Firstly, the influence of Au film thickness on the hierarchical
SERS substrate of polystyrene nanospheres with diameters
of 200nm was characterized. Experiments show that when
the Au film thickness is 50nm, the density of nano-gaps
between the PS colloidal spheres and the SERS substrates
enhancement both reach the optimal level. The micro-
morphological differences of AuFON SERS substrates
prepared by electron beam deposition and ion-beam
sputtering deposition were compared and analyzed from
the perspective of coating atoms’ energy and the polymer
modification by ion bombardment. Furthermore, under
the condition of optimal coating thickness, the absorption
spectrum indicates that the frequency of LSPR (λmax=650,
656nm) is closest to the frequency of the excitation light in
SERS spectra measured (λex=633nm). The FDTD simulation
showed that the electromagnetic field intensity of the SERS
substrate reached the maximum when the gaps between
the coated spheres were about 5nm and the diameter of
the Au clusters covering the PS sphere surface was about
20-30nm. Finally, the SERS substrates were used to detect
the trace elements of melamine and Sudan III successfully.
Speaker Biography
Hong Wang, Dr. Engineering, Associate Professor, State Key Laboratory
of Hollow Fiber Membrane Materials and Processes, School of Materials
Science and Engineering, Tianjin Polytechnic University, China.
Her main research interests include, Raman Spectroscopy, Surface
Enhance Raman Scattering techniques, wastewater treatment by an
electrocatalytic membrane reactor, etc.
e:
waho7808@163.comHong Wang et al., Asian J Biomed Pharmaceut Sci, Volume:9
DOI: 10.4066/2249-622X-C2-020