Application of levitation-jet synthesized nickel-based nanoparticles for gas sensing

Abstract

The gas sensing properties of nickel ferrite (NiFe 2 O 4) and nickel oxide (NiO) nanoparticles prepared by a levitation-jet synthesis (LJS) method are reported. These have been compared to the gas sensing properties of a NiO sensor, prepared using a commercially-sourced powder. The microstructure, surface area, particle size and morphology varied widely across the sensors fabricated. Gases included ethanol, acetone, carbon monoxide, toluene and nitrogen dioxide and the gas response of the sensors was investigated at different operating temperatures. The NiFe 2 O 4 sensor presented most promise as a gas sensor, with outstanding sensor sensitivity towards ppb concentrations of NO 2. This sensor was also remarkably sensitive to ethanol and, to a greater or lesser degree, towards acetone and toluene gases. In general, sensors were poorly responsive to the carbon monoxide concentrations tested. This study is one of the first reports of using LJS-based powders for gas sensing applications for the detection of environmentally-relevant gases.

Growth Processing and Strategies: A Way to Improve the Gas Sensing Performance of Nickel Oxide-Based Devices

“…Figure 13 represents TEM images of Ni/NiO nanostructures prepared by the LJS method with cubic morphology and average particle sizes (<100 nm). He-500 l/h, Ni-1 g/h, (B): He-1000 l/h, O2-200 l/h, Ni-1 g/h, (C): He-1000 l/h, O2-100 l/h, Ni-0.4 g/h, (D): commercial NiO, (E): commercial NiO (Aldrich), (F): He-500 l/h, air-9 l/h, Ni-2 g/h, Fe-3.5 g/h, reproduced from reference [58] Elsevier publisher (Copyright 2019).…”

“…To our knowledge, the catalytic effect and the abundant oxygen adsorption of several Using LJS, Hernández et al prepared a nanocomposite of Fe-Ni oxide that shows good sensitivity towards acetone, ethanol, and toluene, behaving as n-type metal oxide. However, under its exposure to 200 ppb concentrations of NO 2 , the composite NiFe 2 O 4 shows noisy responsiveness that might be related to the poor connectivity of the nanoparticles [58].…”

Ni-sinapic acid nanocomposite in the selective sensing of permanganate ions

“…One of such metal nanoparticles is Ni-based nanoparticles that can be a good semiconductor with their band gap energy in the range 3.6 to 4 eV [12].Additionally, Ni nanoparticles have a great potential for application in various pharmaceutical synthesis [13,14], like magnetic biocatalysis [15], biomolecular separation [16], biosensor, [17] etc. They have different applications in several other fields [18], [19,20], [21,22], [23][24][25]. Various processes have been utilized to prepare the Ni nanoparticles of different shape and size, which include solgel method [26], electrodeposition [27], thermal decomposition of organic complexes [28], chemical reduction [29], co-precipitation [30], solvothermal methods [31,32], etc.…”