A magnonic gas sensor based on magnetic nanoparticles

Abstract

In this paper, we propose an innovative, simple and inexpensive gas sensor based on the variation in the magnetic properties of nanoparticles due to their interaction with gases. To measure the nanoparticle response a magnetostatic spin wave (MSW) tunable oscillator has been developed using an yttrium iron garnet (YIG) epitaxial thin film as a delay line (DL). The sensor has been prepared by coating a uniform layer of CuFe2O4 nanoparticles on the YIG film. The unperturbed frequency of the oscillator is determined by a bias magnetic field, which is applied parallel to the YIG film and perpendicularly to the wave propagation direction. In this device, the total bias magnetic field is the superposition of the field of a permanent magnet and the field associated with the layer of magnetic nanoparticles. The perturbation produced in the magnetic properties of the nanoparticle layer due to its interaction with gases induces a frequency shift in the oscillator, allowing the detection of low concentrations of gases. In order to demonstrate the ability of the sensor to detect gases, it has been tested with organic volatile compounds (VOCs) which have harmful effects on human health, such as dimethylformamide, isopropanol and ethanol, or the aromatic hydrocarbons like benzene, toluene and xylene more commonly known by its abbreviation (BTX). All of these were detected with high sensitivity, short response time, and good reproducibility.

Adsorption of gas molecules on a graphitic GaN sheet and its implications for molecule sensors

“…[52][53][54][55][56] That is to say, analyzing the change in magnetic properties of substrates upon interaction with gases could be a new way to detect gases. For example, Matatagui et al 55,56 reported the combination of a magnetostatic surface wave oscillator with a layer of magnetic oxide nanoparticles in what they called a magnonic gas sensor. The perturbation of the magnetic properties of the magnetic oxide layer induces a frequency shi in the magnetostatic surface wave oscillator that can be registered in the presence of different gases.…”

Surfactant-Alumina-Coated Magnetic Nanoparticles as an Efficient Aldehydes Adsorbent Prior Their Determination by HPLC

“…To overcome such limitation, the surface of Fe 3 O 4 nanoparticles was coated by alumina because of desired point of zero charge (pzc = 9.3) (Xu et al 2014). For example, the modified magnetic nanoparticles, as coated form, were used for high sensitive determination of volatile organic carbon compounds (Matatagui et al 2015). The MNP adsorbents, have a high surface area-to-volume ratio and good superparamagnetic property.…”

Solvothermal synthesis of porous Fe3O4 nanoparticles for humidity sensor application

“…A number of of the magnetic nanostructures can be used in medical applications due to their non-toxicity and biocompatibility [1][2][3]. Several studies have been performed into the use of the materials in drug delivery [4,5], magnetic resonance imaging (MRI) [6], hyperthermia [7,8], medical diagnosis and therapy [9,10] gas sensors [11][12][13], catalysts [14,15], and environmental remediation [16,17]. Several methods are used to synthesize magnetic material; e.g., sol-gel [18,19], reverse micelle [20], co-precipitation process [21,22], γ-ray irradiation [23,24], non-aqueous route [25], microwave plasma synthesis [26], and hydrothermal treatment [27,28].…”