Fabrication of H2S gas sensors using ZnxCu1-xFe2O4 nanoparticles

Abstract

Spinel ferrite nanoparticles can be easily retrieved and utilized for multiple cycles due to their magnetic properties. In this work, nanoparticles of a ZnxCu1-xFe2O4 composition were synthesized by employing a sol–gel auto-combustion technique. The morphology, composition, and crystal structure were examined using scanning electron microscopy, infrared spectroscopy, and X-ray diffraction. The produced nanoparticles are in the range of 30–70 nm and manifest spinel cubic structure. The nanoparticles were tested for their sensitivity to H2 and H2S gases, and the Cu-based spinel ferrite nanoparticles were found the most sensitive and selective to H2S gas. Their enhanced response to H2S gas was attributed to the production of metallic CuFeS2 that manifest higher electrical conductivity as compared with CuFe2O4. The fabricated sensors are functional at low temperatures, and consequently, they need low operational power. They are also simple to fabricate with appropriate cost.

Facile Preparation of Magnetic CuFe2O4 on Sepiolite/GO Nanocomposites for Efficient Removal of Pb(II) and Cd(II) from Aqueous Solution

“…The value of R L provides additional information about the adsorption process. If R L > 1, the process is unfavorable, and if 0 < R L < 1, the process is favorable, while R L = 0 describes an irreversible process and R L = 1 describes a linear process …”

“…7,11 Many kinds of adsorbents, including carbonbased composites, activated carbon, nanoparticles, and clays, are used to remove heavy metals from wastewater. 7,9,10 Copper ferrite nanoparticles (CuFe 2 O 4 NPs) are metal oxides with distinctive physicochemical, optical, and magnetic properties that allow them to be used in various applications, such as catalysis, 12 gas sensors, 13,14 membrane fabrication, 15 and capacitive deionization. 16 However, CuFe 2 O 4 NPs tend to agglomerate due to their magnetic properties, which reduces their surface areas and the exposed adsorption active sites.…”

Design of a mixed‐matrix polyether sulfone membrane with well self‐cleaning capability for oil/water separation

“…Ferrite, as an inexpensive iron oxide, has both magnetic and electrical properties and the hydrophilic properties of inorganic particles. It is widely used in wastewater treatment and other domains 24–26 . Additionally, ferrite loaded with copper ions can be used as a photocatalyst because of its recyclability, which broadens the application field of sustaining materials 26 .…”

“…It is widely used in wastewater treatment and other domains. [24][25][26] Additionally, ferrite loaded with copper ions can be used as a photocatalyst because of its recyclability, which broadens the application field of sustaining materials. 26 Dopamine (DA), as an active material, is prone to self-polymerization.…”

Adsorption of ammonia on ZrOx-modified graphene nanoribbon: a first-principle investigation

“…Conductometric chemical sensors are electronic devices that detect the presence of selected chemicals and their concentrations at their surroundings through the change in the electrical conductance [9][10][11][12][13]. The chemical sensors are important for domestic safety in addition to environmental assessment because they identify hazardous gas concentrations, and send their values to safety as well as control systems.…”