Outstanding Room-Temperature Hydrogen Gas Detection by Plasma-Assisted and Graphene-Functionalized Core–Shell Assembly of SnO₂ Nanoburflower

Abstract

Here, we have reported the synthesis of three-dimensional, mesoporous, nano-SnO 2 cores encapsulated in nonstoichiometric SnO 2 shells grown by chemical as well as physical synthesis procedures such as plasma-enhanced chemical vapor deposition, followed by functionalization with reduced graphene oxide (rGO) on the surface. The main motif to fabricate such morphology, i.e., core–shell assembly of burflower-like SnO 2 nanobid is to distinguish gases quantitatively at reduced operating temperatures. Electrochemical results reveal that rGO anchored on SnO 2 surface offers excellent gas detection performances at room temperature. It exhibits outstanding H 2 selectivity through a wide range, from ∼10 ppm to 1 vol %, with very little cross-sensitivity against other similar types of reducing gases. Good recovery as well as prompt responses also added flair in its quality due to the highly mesoporous architecture. Without using any expensive dopant/catalyst/filler or any special class of surfactants, these unique SnO 2 mesoporous nanostructures have exhibited exceptional gas sensing performances at room temperature and are thus helpful to fabricate sensing devices in most cost-effective and eco-friendly manner.

Advanced development of metal oxide nanomaterials for H2gas sensing applications

“…High-performance sensing materials can be obtained by controlling the morphology and structure of the MOx nanomaterials, 50,140,56 especially on the atomic and molecular dimensions. The synthesis methods have a great impact on the morphology of the materials.…”

Electronic Nose Based on Temperature Modulation of MOS Sensors for Recognition of Excessive Methanol in Liquors

“…It is well accepted that the selective performance of MOS gas sensors is modulated by a balance of gas adsorption and reaction on the surface, which is temperature dependent. , However, the sensing process is a very complex process of surface chemical reactions and electron conduction . Thus, there were no mature models for the temperature-dependent selective characteristics.…”

“…18,22 However, the sensing process is a very complex process of surface chemical reactions and electron conduction. 23 Thus, there were no mature models for the temperature-dependent selective characteristics. Generally, sensor conductance could be well described by eq 1, which is also known as the Morrison equation for MOS gas sensors 24…”

Hydrogen gas sensing performance of a carbon-doped boron nitride nanoribbon at elevated temperatures

“…The investigation shows at 100˚C, a voltage shift of 100 mV at 1 mA reverse bias current for 1% hydrogen in synthetic air. Another experimental works by Nandi et al [16] studied the detection on hydrogen gas at room temperature by utilizing plasmaassisted and graphene-functionalized core-shell assembly of SnO 2 Nanoburflower. Whilst Zhang et al [1] studied hydrogen gas sensor based on metal oxide nanoparticles decorated with SnO 2 NPs on graphene transistor.…”