Highly Selective Detection of Hydrogen Sulfide by Simple Cu-CNTs Nanocomposites

Abstract

The presented work is devoted to the preparation of nanocomposites based on multiwall carbon nanotubes (MWCNTs) and copper (Cu) nanoparticles by a simple chemical method, and to study their sensing properties to hydrogen sulfide (H2S) gas. The Cu decorated multiwall carbon nanotubes (MWCNTs/Cu) were prepared by the deposition of very thin Cu layers on the pristine and functionalized multiwall carbon nanotubes (f-MWCNTs) using both physical (electron beam evaporation (EBE)) and chemical (electrochemical deposition) methods. MWCNTs/Cu prepared in the two above-mentioned ways, their sensing properties were studied, and the results were comparatively analyzed. The effect of the chemical functionalization of MWCNTs by oxygen-containing groups on the sensing properties of these f-MWCNT/Cu nanocomposites has been investigated. All the prepared sensors demonstrated high sensitivity and selectivity to H2S in the air at room temperature. The f-MWCNT/Cu structure obtained by the chemical method demonstrated about 5 times (~400%) higher sensitivity (∆R/R0) to H2S gas compared to the similar structure obtained by the physical method. The temperature effect on sensory characteristics (response and self-recovery time) of the f-MWCNTs/Cu structure was also studied.

Addressing Hydrogen Sulfide Corrosion in Oil and Gas Industries: A Sustainable Perspective

“…Continuous monitoring of H 2 S using gas sensors in vital refinery areas is essential for promptly detecting potential risks. The implementation of alarms and automatic shutdown systems for increased H 2 S levels enhances safety, ensuring a swift response and minimizing hazards [90]. Furthermore, the deployment of corrosion probes, coupons, or ultrasonic thickness gauges effectively evaluates corrosion rates on metal surfaces exposed to H 2 S-containing environments.…”

Resistive Gas Sensors Based on Porous Sp-Containing Films Obtained by Dehydrohalogenation of PVDC and PVDC-PVC Copolymer

“…Among these techniques, resistive gas sensing is of particular interest due to the low cost, high stability and sensitivity of the sensors [1]. Although the use of resistive sensors is hampered by their low selectivity and high operational temperature, chemically modified carbon materials are known to overcome these drawbacks [2]. In our previous work, we demonstrated that these disadvantages may be overcome by using dehydrofluorinated polyvinylidene fluoride (PVDF) as a sensing material [3].…”

“…Such material is denoted as "polyyne-polyene" in our studies. Such notation indicates that the obtained material has a chain-like structure, which is comprised from both sp-(polyynic) and sp 2 -hybridized (polyenic) linear fragments. In our previous studies, such structures were confirmed as a result of the dehydrohalogenation of PVDC [8] and PVDF [3].…”