Palladium/Graphene Oxide Nanocomposite for Hydrogen Gas Sensing Applications Based on Tapered Optical Fiber

Abstract

Gaseous pollutants such as hydrogen gas (H2) are emitted in daily human activities. They have been massively studied owing to their high explosivity and widespread usage in many domains. The current research is designed to analyse optical fiber-based H2 gas sensors by incorporating palladium/graphene oxide (Pd/GO) nanocomposite coating as sensing layers. The fabricated multimode silica fiber (MMF) sensors were used as a transducing platform. The tapering process is essential to improve the sensitivity to the environment through the interaction of the evanescent field over the area of the tapered surface area. Several characterization methods including FESEM, EDX, AFM, and XRD were adopted to examine the structure properties of the materials and achieve more understandable facts about their functional performance of the optical sensor. Characterisation results demonstrated structures with a higher surface for analyte gas reaction to the optical sensor performance. Results indicated an observed increment in the Pd/GO nanocomposite-based sensor responses subjected to the H2 concentrations increased from 0.125% to 2.00%. The achieved sensitivities were 33.22/vol% with a response time of 48 s and recovery time of 7 min. The developed optical fiber sensors achieved excellent selectivity and stability toward H2 gas upon exposure to other gases such as ammonia and methane.

Spectroscopic Techniques and Hydrogen-Sensitive Compounds: A New Horizon in Hydrogen Detection

“…Graphene or graphene oxide can serve as an excellent substrate, facilitating better integration with metals such as Pd, thus maximizing the metal's ability to bind with hydrogen. Alkhabet developed an optical sensor based on graphene oxide and metal [13]. By using Pd-graphene oxide (Pd-GO) nanocomposite as a sensing layer, the research taps into the potential benefits of these advanced materials for gas detection.…”

Review of the Status and Prospects of Fiber Optic Hydrogen Sensing Technology

“…The se also exhibited good selectivity and stability. In 2022, Alkhabet et al [53] reported an MMF taper hydrogen sensor by using a palladium/graphene oxide (Pd/GO) nanocomposite coating as a sensing layer, as shown in Figure 36. The sensitivity of 33.22/vol% with a response time of 48 s and a recovery time of 7 min were obtained under the H 2 concentration range from 0.125% to 2.00%.…”

Pd@GO catalyzed stereo- and regio-selective addition of arenes to alkynes and synthesis of coumarins via C–H functionalization

“…9 Pd@GO has been used in various other studies, such as gas detection, electrocatalysis, hydrogenation, oxidation, and reduction reactions etc. [10][11][12][13][14] Various coupling reactions are also reported, such as Ullmann, Heck, Sonogashira, and Suzuki-Miyaura coupling reactions, etc. [15][16][17][18] However, heterogeneous catalysis for C-H functionalization is currently being explored.…”