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Monolayer Epitaxial Heterostructures for Selective Visible-Light-Driven Photocatalytic NO Oxidation
摘要： Construction of vertical heterostructures by stacking two-dimensional (2D) layered materials via chemical bonds can be an effective strategy to explore advanced solar-energy-conversion systems. However, it remains a great challenge to fabricate such heterostructures based on conversional oxide-based compounds, as they either do not possess a 2D layered structure or are not suitable for epitaxial growth due to large lattice mismatch. Here, a vertical heterostructure of bismuth oxyhalide semiconductors fabricated through a heteroepitaxial anion exchange method is reported. Monolayer Bi2WO6 is epitaxially grown on the exposed surface of BiOI to inhibit photocorrosion and introduce active sites. Theoretical and experimental results reveal that electrons generated under visible-light irradiation can directly transfer to surface coordinatively unsaturated (CUS) Bi atoms, which contribute to the adsorption and activation of reactant molecules. As a result, the Bi2WO6/BiOI vertical heterostructures exhibit significantly enhanced visible-light-driven NO oxidation activity compared with BiOI and Bi2WO6.
关键词： epitaxial heterostructures,NO oxidation,photocatalysis,Bi2WO6,BiOI
更新于2025-09-23 15:22:29
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Nanostructured Au(111)/Oxide Epitaxial Heterostructures with Tailoring Plasmonic Response by a One-Step Strategy
摘要： In this work we present a strategy for developing epitaxial incommensurate nanostructured-Au/oxide heterostructures with tuneable plasmonic response. Previously high quality single phase and oriented α-Fe2O3(0001) thin films were achieved, which have been used as a template for the noble metal epitaxial deposition. The complex systems have been grown by pulsed laser deposition on two different type of oxide substrates: α-Al2O3(0001) and SrTiO3(111). A one-step procedure has been achieved tailoring the isolated character and the morphological features of Au nanostructures through the substrate temperature during the Au growth, without altering the structural characteristics of the hematite layer that is identified as single iron oxide phase. The epitaxial character and the lattice coupling of Au/oxide bilayers are mediated through the sort of oxide substrate. Single oriented Au(111) islands are disposed with a rotation of 30o between their crystallographic axes and those of α-Fe2O3(0001). The Au(111) and SrTiO3(111) lattices are collinear while a rotation of 30o happens respect to the α-Al2O3(0001) lattice. The crystallographic domain size and crystalline order of hematite structure and Au nanostructured-layer are dependent on the substrate type and the Au growth temperature respectively. Besides, the functional character of the complex systems has been tested. The localized surface plasmons related to Au nanostructures are excited and controlled through the fabrication parameters, tuning the optical resonance with the degree of Au nanostructuring.
关键词： Tailoring Plasmonic Response,Oxide Epitaxial Heterostructures,Nanostructured Au,One-Step Strategy,Plasmonics,Hybrid Materials,Optical,Magnetic
更新于2025-09-12 10:27:22