Realization of high sensitive SERS substrates with one-pot fabrication of Ag-Fe3O4 nanocomposites

Shuangmei Zhu; Chunzhen Fan; Junqiao Wang; Jinna He; Erjun Liang; Mingju Chao

doi:10.1016/j.jcis.2014.09.015

Realization of high sensitive SERS substrates with one-pot fabrication of Ag-Fe3O4 nanocomposites

J Colloid Interface Sci. 2015 Jan 15:438:116-121. doi: 10.1016/j.jcis.2014.09.015. Epub 2014 Oct 23.

Authors

Shuangmei Zhu¹, Chunzhen Fan², Junqiao Wang³, Jinna He⁴, Erjun Liang⁵, Mingju Chao⁶

Affiliations

¹ School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China; College of Science, Henan Institute of Engineering, Zhengzhou 451191, China. Electronic address: wypiaoxue@163.com.
² School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China. Electronic address: chunzhen@zzu.edu.cn.
³ School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China. Electronic address: junqiaowang@126.com.
⁴ School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China. Electronic address: hena09@eyou.com.
⁵ School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China. Electronic address: ejliang@zzu.edu.cn.
⁶ School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China. Electronic address: mingjuchao@zzu.edu.cn.

PMID: 25454433
DOI: 10.1016/j.jcis.2014.09.015

Abstract

Ag-Fe3O4 nanocomposites were synthesized by the redox reaction between Ag2O and Fe(OH)2 in the absence of additional reductant at moderate temperature and atmospheric condition. The as-synthesized Ag-Fe3O4 nanocomposites are assembled into an orderly arrayed SERS substrate holding clean and reproducible properties with an applied external magnetic field. 4-mercaptobenzoic acid (4-MBA) is chosen as the probe molecule to test the enhancement factors (EF), uniformity and reproducibility of the SERS substrate. Experimental results indicate that the EF of 4-MBA on our proposed SERS substrate is up to 5.2×10(6) and the detection limit is down to ∼10(-10) M. The SERS spectra of 4-MBA molecules ranging from 200 cm(-1) to 2000 cm(-1) were randomly collected from a number of positions on the substrate and six Ag-Fe3O4 nanocomposites substrates are measured with the same procedure. It is shown that the SERS substrate have the good uniformity and reproducibility with low standard deviation, indicating our proposed Ag-Fe3O4 nanocomposites with external magnetic field control abilities have potential applications in the fields of magnetic separation and SERS techniques.

Keywords: 4-Mercaptobenzoic acid; Ag–Fe(3)O(4) nanocomposites; SERS.