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

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Frontiers of Chemistry in China

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.

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Authors and Affiliations

  1. School of Material Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    Xiaoqi Fu

  2. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China

    Xiaoqi Fu, Shuang Wang, Qian Zhao, Tingshun Jiang & Hengbo Yin

Authors
  1. Xiaoqi Fu
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  2. Shuang Wang
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  3. Qian Zhao
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  4. Tingshun Jiang
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  5. Hengbo Yin
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Correspondence to Xiaoqi Fu.

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Fu, X., Wang, S., Zhao, Q. et al. Thin films of α-Fe2O3 nanoparticles using as nonmetallic SERS-active nanosensors for submicromolar detection. Front. Chem. China 6, 206–212 (2011). https://doi.org/10.1007/s11458-011-0249-2

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  • DOI: https://doi.org/10.1007/s11458-011-0249-2

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