Gas sensing properties of hematite nanoparticles synthesized <i>via</i> different techniques

Hjiri, Mokhtar; Algessair, Saja; Dhahri, Ramzi; Mirzaei, Ali; Neri, Giovanni

doi:10.1039/d4ra02338b

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RSC Adv.

2024

DOI: 10.1039/d4ra02338b

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Gas sensing properties of hematite nanoparticles synthesized via different techniques

Mokhtar Hjiri,

Saja Algessair,

Ramzi Dhahri

et al.

Abstract: The synthesis techniques used for metal oxide semiconductors strongly influence their chemical, physical and gas sensing characteristics.

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Plasma-Enhanced Atomic Layer Deposition of Hematite for Photoelectrochemical Water Splitting Applications

Harris-Lee,

Brookes,

Zhang

et al. 2024

Crystals

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Hematite (α-Fe2O3) is one of the most promising and widely used semiconductors for application in photoelectrochemical (PEC) water splitting, owing to its moderate bandgap in the visible spectrum and earth abundance. However, α-Fe2O3 is limited by short hole-diffusion lengths. Ultrathin α-Fe2O3 films are often used to limit the distance required for hole transport, therefore mitigating the impact of this property. The development of highly controllable and scalable ultrathin film deposition techniques is therefore crucial to the application of α-Fe2O3. Here, a plasma-enhanced atomic layer deposition (PEALD) process for the deposition of homogenous, conformal, and thickness-controlled α-Fe2O3 thin films (<100 nm) is developed. A readily available iron precursor, dimethyl(aminomethyl)ferrocene, was used in tandem with an O2 plasma co-reactant at relatively low reactor temperatures, ranging from 200 to 300 °C. Optimisation of deposition protocols was performed using the thin film growth per cycle and the duration of each cycle as optimisation metrics. Linear growth rates (constant growth per cycle) were measured for the optimised protocol, even at high cycle counts (up to 1200), confirming that all deposition is ‘true’ atomic layer deposition (ALD). Photoelectrochemical water splitting performance was measured under solar simulated irradiation for pristine α-Fe2O3 deposited onto FTO, and with a α-Fe2O3-coated TiO2 nanorod photoanode.

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Plasma-Enhanced Atomic Layer Deposition of Hematite for Photoelectrochemical Water Splitting Applications

Harris-Lee,

Brookes,

Zhang

et al. 2024

Crystals

View full text Add to dashboard Cite

show abstract

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Gas sensing properties of hematite nanoparticles synthesized via different techniques

Abstract: The synthesis techniques used for metal oxide semiconductors strongly influence their chemical, physical and gas sensing characteristics.

Cited by 1 publication

References 38 publications

Plasma-Enhanced Atomic Layer Deposition of Hematite for Photoelectrochemical Water Splitting Applications

Plasma-Enhanced Atomic Layer Deposition of Hematite for Photoelectrochemical Water Splitting Applications

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