Thin films of α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles using as nonmetallic SERS-active nanosensors for sub-micromolar detection

doi:10.1007/s11458-011-0249-2

Front Chem Chin

2011, Vol. 6

Issue (3) : 206-212 https://doi.org/10.1007/s11458-011-0249-2

RESEARCH ARTICLE

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

Xiaoqi FU^1,2(

), Shuang WANG², Qian ZHAO², Tingshun JIANG², Hengbo YIN²

1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China; 2. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China

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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

Corresponding Author(s): FU Xiaoqi,Email:xfu@ujs.edu.cn

Issue Date: 05 September 2011

Cite this article:

Xiaoqi FU,Shuang WANG,Qian ZHAO, et al. Thin films of α-Fe₂O₃ nanoparticles using as nonmetallic SERS-active nanosensors for sub-micromolar detection[J]. Front Chem Chin, 2011, 6(3): 206-212.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-011-0249-2
https://academic.hep.com.cn/fcc/EN/Y2011/V6/I3/206

Fig.1 Schematic of the fabrication process for α-FeO thin films assembly

Fig.2 X-ray diffraction patterns of the resulting α-FeO particles: (a) 100 nm; (b) 65 nm; (c) 5 nm

Fig.3 TEM micrographs of α-FeO particles: (a) 100 nm; (b) 65 nm; (c) 5 nm

Fig.4 SEM micrographs of α-FeO nanoparticle thin films with samples of different sizes: (a) 100 nm; (b) 65 nm; (c) 5 nm

Tab.1 Raman frequencies (cm) and band assignments for 4-Mpy

Fig.5 SERS spectra of 4-Mpy adsorbed on α-FeO thin films with different size samples: (a) 100 nm; (b) 65 nm; (c) 5 nm; (d) normal Raman spectrum of bulk 4-Mpy; (e) Raman spectrum of the adsorbate-free surface

Fig.6 SERS spectra of 2-MBT adsorbed on α-FeO thin films with different size samples: (a) Sample 1, (b) Sample 2, (c) Sample 3; (d) normal Raman spectrum of bulk 2-MBT; (e) Raman spectrum of the adsorbate-free surface

Fig.7 SERS spectra from 4-Mpy at different concentrations adsorbed on the surface of α-FeO thin films: (a) 1 × 10 mol/L; (b) 1 × 10 mol/L; (c) 1 × 10 mol/L; (d) 1 × 10 mol/L; (e) 1 × 10 mol/L; (f) 1 × 10 mol/L; (g) 1 × 10 mol/L

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