title: Realization of high sensitive SERS substrates with one-pot fabrication of Ag-Fe3O4 nanocomposites.
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.
authors.affiliation: 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.
authors.forename: Shuangmei
authors.initials: S
authors.lastname: Zhu
authors.affiliation: 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.
authors.forename: Chunzhen
authors.initials: C
authors.lastname: Fan
authors.affiliation: 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.
authors.forename: Junqiao
authors.initials: J
authors.lastname: Wang
authors.affiliation: 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.
authors.forename: Jinna
authors.initials: J
authors.lastname: He
authors.affiliation: 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.
authors.forename: Erjun
authors.initials: E
authors.lastname: Liang
authors.affiliation: 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.
authors.forename: Mingju
authors.initials: M
authors.lastname: Chao
keywords: 4-Mercaptobenzoic acid; Ag–Fe(3)O(4) nanocomposites; SERS