Issue 101, 2014

Highly selective NO2 sensor at room temperature based on nanocomposites of hierarchical nanosphere-like α-Fe2O3 and reduced graphene oxide

Abstract

Nanosphere-like α-Fe2O3 modified reduced graphene oxide nanosheets were prepared by a simple hydrothermal method without any surfactant or template. The nanocomposites were characterized by X-ray diffraction (XRD), Raman spectra (RS), Fourier transform infrared (FT-IR) spectra, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The α-Fe2O3 nanospheres have a hierarchical structure, with diameter of about 40–50 nm, and grow uniformly on the surface of single graphene nanosheets. α-Fe2O3/rGO nanocomposites exhibit high response of 150.63% to 90 ppm NO2 at room temperature, 65.5 times higher than the response of pure graphene, and the detection limit for NO2 can be decreased down to 0.18 ppm. A mechanism is proposed for sensing of the nanocomposites: the high response of the nanocomposites to NO2 at room temperature is the synergistic effect of the two sensing materials and large specific surface area of the nanocomposites.

Graphical abstract: Highly selective NO2 sensor at room temperature based on nanocomposites of hierarchical nanosphere-like α-Fe2O3 and reduced graphene oxide

Article information

Article type
Paper
Submitted
10 Sep 2014
Accepted
23 Oct 2014
First published
23 Oct 2014

RSC Adv., 2014,4, 57493-57500

Author version available

Highly selective NO2 sensor at room temperature based on nanocomposites of hierarchical nanosphere-like α-Fe2O3 and reduced graphene oxide

Y. Dong, X. Zhang, X. Cheng, Y. Xu, S. Gao, H. Zhao and L. Huo, RSC Adv., 2014, 4, 57493 DOI: 10.1039/C4RA10136G

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