10.1021/jp203181c.s001
Jingjing Du
Jingjing
Du
Chuanyong Jing
Chuanyong
Jing
Preparation of Thiol Modified Fe<sub>3</sub>O<sub>4</sub>@Ag Magnetic SERS Probe for PAHs Detection and Identification
American Chemical Society
2011
PAH solution
detection limit
PAHs Detection
SERS Probe
surface morphology
structure spectroscopy
Raman spectrometer
novel substrate
SERS response
transmission electron microscopy
PAHs concentration
probe molecules
Thiol Modified Fe 3O
SERS sensitivity
sample magnetometry analysis
saturation magnetization
SERS platform
PAH monitoring
2011-09-15 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Preparation_of_Thiol_Modified_Fe_sub_3_sub_O_sub_4_sub_Ag_Magnetic_SERS_Probe_for_PAHs_Detection_and_Identification/2614231
In situ detection and identification of PAHs, a group of well-known persistent organic pollutants, presents a great challenge to environmental researchers. This work developed a novel substrate based on thiol-functionalized Fe<sub>3</sub>O<sub>4</sub>@Ag core–shell magnetic nanoparticles for surface enhanced Raman scattering (SERS) sensing of PAHs. The surface morphology, structure, and magnetic properties of the substrate were characterized using multiple complementary techniques including transmission electron microscopy, energy-dispersive X-ray spectroscopy, vibrating sample magnetometry analysis, and extended X-ray absorption fine structure spectroscopy. The high saturation magnetization at 48.35 emu g<sup>–1</sup> enabled the complete and rapid separation of the substrate from the PAH solution. Benzene, naphthalene, anthracene, phenanthrene, fluorene, pyrene, perylene, and BaP were chosen as probe molecules. Qualitative and quantitative determination of PAHs was achieved using a portable Raman spectrometer. The SERS sensitivity was positively correlated with the hydrophobic nature of PAHs. The SERS response exhibited a linear dependence on the PAHs concentration between 1 to 50 mg/L, and the detection limit in the order 10<sup>–5</sup> to 10<sup>–7</sup> M was obtained. The SERS platform with magnetic substrate provides a new way for in situ PAH monitoring.