Thin films of α-Fe2O3 nanoparticles using as nonmetallic SERS-active nanosensors for sub-micromolar detection

Xiaoqi FU, Shuang WANG, Qian ZHAO, Tingshun JIANG, Hengbo YIN

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PDF(432 KB)
Front. Chem. China ›› 2011, Vol. 6 ›› Issue (3) : 206-212. DOI: 10.1007/s11458-011-0249-2
RESEARCH ARTICLE

Thin films of α-Fe2O3 nanoparticles using as nonmetallic SERS-active nanosensors for sub-micromolar detection

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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.

Keywords

nanosensors / SERS / α-Fe2O3 nanoparticles / thin film

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Xiaoqi FU, Shuang WANG, Qian ZHAO, Tingshun JIANG, Hengbo YIN. Thin films of α-Fe2O3 nanoparticles using as nonmetallic SERS-active nanosensors for sub-micromolar detection. Front Chem Chin, 2011, 6(3): 206‒212 https://doi.org/10.1007/s11458-011-0249-2

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Acknowledgements

This work was supported by the Natural Science Foundation of Jiangsu Higher Education Institutions of China (No. 09KJD150002), Zhenjiang Science and Technology Bureau (No. GJ2006006) and Jiangsu University High-grade Specialty Person Scientific Research Foundation (No. 10JDG114).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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