Abstract
A new kind of nonmetallic nanosensors based on surface-enhanced Raman spectroscopy (SERS) have been successfully prepared by the assembly of α-Fe2O3 nanoparticles (NPs) onto clean quartz surface via the cross-linker of hexamethylene diisocyanate (HDI).The resultant substrates have been characterized by electron micrographs,which show that the α-Fe2O3 NPs distribute on the modified surface uniformly with a monolayer or sub-monolayer structure.4-mercaptopyridine (4-Mpy) and 2-mercaptobenzothiazole (2-MBT) molecules have been used as SERS probes to estimate the detection efficiency of the α-Fe2O3 thin films.The SERS experiments show that it is possible to record high quality SERS spectra from probe molecules on the α-Fe2O3 thin films at sub-micromolar (＜ 10 6 mol/L) concentration.These results indicate that the highly ordered,uniformly roughed,highly sensitive and low-cost α-Fe2O3 thin films are excellent candidates for nonmetallic SERS-active nanosensors.
基金项目
This work was supported by the Natural Science Foundation of Jiangsu Higher Education Institutions of China(09KJD150002)
Zhenjiang Science and Technology Bureau(GJ2006006)
Jiangsu University High-grade Specialty Person Scientific Research Foundation(10JDG114)
NETL
NSTL
万方数据