A high-sensitivity hydrogen gas sensor based on Ag nanoparticle-decorated porous Co3O4 nanorods

Vu Hung Sinh; Duong Tuan Quang; Tran Quy Phuong; Tran Thai Hoa; Nguyen Van Hieu; Nguyen Duc Cuong

doi:10.15625/2525-2518/17639

Author affiliations

Authors

Vu Hung Sinh University of Education, Hue University, 34 Le Loi, Hue City, Thua Thien Hue Province, Viet Nam
Duong Tuan Quang University of Education, Hue University, 34 Le Loi, Hue City, Thua Thien Hue Province, Viet Nam
Tran Quy Phuong University of Sciences, Hue University, 77 Nguyen Hue, Hue City, Thua Thien Hue Province, Viet Nam
Tran Thai Hoa University of Sciences, Hue University, 77 Nguyen Hue, Hue City, Thua Thien Hue Province, Viet Nam
Nguyen Van Hieu Faculty of Electrical and Electronic Engineering, Phenikaa University, Yen Nghia Ward, Ha Dong District, Hanoi city, Viet Nam
Nguyen Duc Cuong University of Sciences, Hue University, 77 Nguyen Hue, Hue City, Thua Thien Hue Province, Viet Nam https://orcid.org/0000-0002-7341-3661

DOI:

https://doi.org/10.15625/2525-2518/17639

Keywords:

Ag nanoparticles, porous Co3O4 nanorods, H2, gas sensors

Abstract

In this report, Ag nanoparticle-decorated cobalt carbonate hydroxide microflowers were synthesized using a simple hydrothermal approach without using surfactants, which were used as precursors to prepare Ag nanoparticle-decorated porous Co₃O₄ nanorods through an annealing process. The porous Co₃O₄ nanorods were composed of small primary nanoparticles with a size of ~ 10 nm, and their surface was decorated with uniform Ag nanoparticles (~ 10 nm). Sensors based on the porous Co₃O₄ nanorods decorated with Ag nanoparticles have higher sensitivity and selectivity to H₂ gas than other reduced gases, as well as rapid response-recovery times. The enhanced H₂ sensing properties of the sample may be attributed to the excellent catalytic features of Ag nanoparticles and unique porous Co₃O₄ nanorods. The results demonstrated the potential of Ag nanoparticle-decorated porous Co₃O₄ nanorods as sensing materials for the detection of hydrogen gas at low temperatures.

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