Thin films of α-Fe2O3 nanoparticles using as nonmetallic SERS-active nanosensors for submicromolar detection
Tóm tắt
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.
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