Ag/Co3O4 nanocomposites from ZIF-67 MOF for enhanced low-temperature toluene gas sensing

IF 2.9 3区物理与天体物理 Q3 NANOSCIENCE & NANOTECHNOLOGY

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-01 DOI:10.1016/j.physe.2024.116174

W.J. Wu , Bo Hong , Jingcai Xu , Xiaoling Peng , Jing Li , Hongwei Chen , Shi Qiu , Nan Zhang , Xinqing Wang

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引用次数: 0

Abstract

Porous Co₃O₄ nanostructures are synthesized through thermolysis of ZIF-67 MOF, and then Ag nanoparticles are loaded into Co₃O₄ nanostructures to obtain Ag/Co₃O₄ nanocomposites. All results indicate that Ag-loading increases the specific surface area and bandgap of Ag/Co₃O₄ nanocomposites, as the result, the toluene gas sensing performance is also improved greatly. Among them, Ag_0.126-Co₃O₄ sensor exhibits the highest response value of 520.60 to 100 ppm toluene gas at 150 °C, which is 21.28 times than that of Co₃O₄ sensor. Notably, the optimal operating temperature of Ag/Co₃O₄ sensors decreases from 230 °C to 150 °C due to the excellent catalytic activity of Ag nanoparticles. Moreover, Ag/Co₃O₄ sensors display the excellent selectivity and favorable stability to toluene gas. Ag nanoparticles lead to the formation of Schottky heterojunctions, increasing the resistance in toluene gas. Furthermore, Ag nanoparticles provide more oxygen adsorption sites, reducing the resistance in air. Based on the synergistic effect of chemical sensitization, spillover effect, high specific surface area and Schottky heterojunctions, Ag-loading can enhance the toluene gas sensing performance of Ag/Co₃O₄ sensors.

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来源期刊

Physica E-low-dimensional Systems & Nanostructures 物理-纳米科技

CiteScore

7.30

自引率

6.10%

发文量

356

审稿时长

65 days

期刊介绍： Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals. Both theoretical and experimental contributions are invited. Topics suitable for publication in this journal include spin related phenomena, optical and transport properties, many-body effects, integer and fractional quantum Hall effects, quantum spin Hall effect, single electron effects and devices, Majorana fermions, and other novel phenomena. Keywords: • topological insulators/superconductors, majorana fermions, Wyel semimetals; • quantum and neuromorphic computing/quantum information physics and devices based on low dimensional systems; • layered superconductivity, low dimensional systems with superconducting proximity effect; • 2D materials such as transition metal dichalcogenides; • oxide heterostructures including ZnO, SrTiO3 etc; • carbon nanostructures (graphene, carbon nanotubes, diamond NV center, etc.) • quantum wells and superlattices; • quantum Hall effect, quantum spin Hall effect, quantum anomalous Hall effect; • optical- and phonons-related phenomena; • magnetic-semiconductor structures; • charge/spin-, magnon-, skyrmion-, Cooper pair- and majorana fermion- transport and tunneling; • ultra-fast nonlinear optical phenomena; • novel devices and applications (such as high performance sensor, solar cell, etc); • novel growth and fabrication techniques for nanostructures