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Issue 6, 2019
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Highly sensitive detection of nitrite by using gold nanoparticle-decorated α-Fe2O3 nanorod arrays as self-supporting photo-electrodes

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Abstract

Gold nanoparticle (AuNPs)-decorated α-Fe2O3 nanorod arrays (AuNPs-Fe2O3) were successfully fabricated by immersing 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 good photoelectric properties, the proposed AuNPs-Fe2O3 can be directly utilized as a self-supporting photoelectrode for nitrite detection. As a result, the as-constructed sensor exhibited good photoelectron catalytic activity and selectivity, high sensitivity (0.1736 ± 0.01 μA μM−1 cm−2) and a low limit of detection (0.07 μM). The current response has a high linear correlation (R ≥ 0.999) in a wide range from 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.

Graphical abstract: Highly sensitive detection of nitrite by using gold nanoparticle-decorated α-Fe2O3 nanorod arrays as self-supporting photo-electrodes

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Supplementary files

Article information


Submitted
19 Feb 2019
Accepted
09 Apr 2019
First published
09 Apr 2019

Inorg. Chem. Front., 2019,6, 1432-1441
Article type
Research Article

Highly sensitive detection of nitrite by using gold nanoparticle-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, 6, 1432
DOI: 10.1039/C9QI00176J

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