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Highly sensitive detection of nitrite by using gold nanoparticles-decorated α-Fe2O3 nanorod arrays as self-supporting photo-electrodes

Abstract

The gold nanoparticles (AuNPs)-decorated α-Fe2O3 nanorod arrays (AuNPs-Fe2O3) were successfully fabricated by immersing the hydrothermal-induced Fe2O3 nanorod arrays into HAuCl4 solution, followed by a simple reduction process. The obtained AuNPs on the α-Fe2O3 nanorods were about 3-5 nm in diameter. The photocurrent of AuNPs-Fe2O3 was twice as large as that of α-Fe2O3 nanorods. Benefiting from the excellent photoelectric properties, the proposed AuNPs-Fe2O3 can be directly utilized as the self-supporting photoelectrode for nitrite detection. As a result, the as-constructed sensor exhibited excellent photoelectron catalytic activity and good selectivity, high sensitivity (0.1736 µA µM−1 cm−2) and low detection limit (0.07 µM). The current response has a high linear correlation (R ≥ 0.999) with a wide range of 1 µM to 1000 µM and high stability. In addition, the as-constructed sensor was further employed for nitrite detection in tap and rain water samples to evaluate its practical applications.

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Publication details

The article was received on 19 Feb 2019, accepted on 09 Apr 2019 and first published on 09 Apr 2019


Article type: Research Article
DOI: 10.1039/C9QI00176J
Citation: Inorg. Chem. Front., 2019, Accepted Manuscript

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    Highly sensitive detection of nitrite by using gold nanoparticles-decorated α-Fe2O3 nanorod arrays as self-supporting photo-electrodes

    S. Kang, H. Zhang, G. Wang, Y. Zhang, H. Zhao, H. Zhou and W. Cai, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QI00176J

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