Experimental and theoretical evaluation of crystal facet exposure on the charge transfer and SERS activity of ZnO films

Luo, Ying; Niu, Lengyuan; Wang, Yifan; Wen, Peipei; Gong, Yinyan; Li, C.; Xu, Shiqing

doi:10.1039/d2nr04476e

Cited by 9 publications

(6 citation statements)

References 53 publications

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“…The orientation of crystallites relative to the substrate, as well as the exposed crystal facets, affect the properties of deposited lms. The phenomenon is universal and has been reported for various materials, including BiVO 4 1 , WO 3 2 , TiO 2 3 , ZnO 4 , Bi 2 O 3 5 , and others. The ability to control the exposure of speci c crystal facets can be bene cial for applications in photoelectrochemistry 3 , energy storage and conversion 6 , photocatalysis 7 , and sensing 8 .…”

Section: Introductionmentioning

confidence: 80%

Crystal Crafting: Controlling Crystallites Orientation and Facet Exposure for Enhanced Electrochemical Properties of Polycrystalline MoO3 Films

Trzciński

Zarach

Szkoda

et al. 2023

Preprint

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This study focuses on the development and optimization of MoO3 films on commercially available FTO substrates using the pulsed laser deposition (PLD) technique. By carefully selecting deposition conditions and implementing post-treatment procedures, precise control over crystallite orientation relative to the substrate is achieved. Deposition at 450°C in O2 atmosphere results in random crystallite arrangement, while introducing argon instead of oxygen to the PLD chamber during the initial stage of sputtering exposes the (102) and (011) facets. On the other hand, room temperature deposition leads to the formation of amorphous film, but after appropriate post-annealing treatment, the (00k) facets were exposed. The deposited films are studied using SEM and XRD techniques. Moreover, electrochemical properties of FTO/MoO3 electrodes immersed in 1 M AlCl3 aqueous solution are evaluated using cyclic voltammetry and electrochemical impedance spectroscopy. The results demonstrate that different electrochemical processes are promoted based on the orientation of crystallites. When the (102) and (011) facets are exposed, the Al3+ ions intercalation induced by polarization is facilitated, while the (00k) planes exposure leads to the diminished hydrogen evolution reaction overpotential.

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Section: Introductionmentioning

confidence: 80%

Crystal Crafting: Controlling Crystallites Orientation and Facet Exposure for Enhanced Electrochemical Properties of Polycrystalline MoO3 Films

Trzciński

Zarach

Szkoda

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The orientation of crystallites relative to the substrate, as well as the exposed crystal facets, affect the properties of deposited films. The phenomenon is universal and has been reported for various materials, including BiVO 4 1 , WO 3 2 , TiO 2 3 , ZnO 4 , Bi 2 O 3 5 , and others. The ability to control the exposure of specific crystal facets can be beneficial for applications in photoelectrochemistry 3 , energy storage and conversion 6 , photocatalysis 7 , and sensing 8 .…”

Section: Introductionmentioning

confidence: 82%

Controlling crystallites orientation and facet exposure for enhanced electrochemical properties of polycrystalline MoO3 films

Trzciński,

Zarach,

Szkoda

et al. 2023

Sci Rep

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This study focuses on the development and optimization of MoO3 films on commercially available FTO substrates using the pulsed laser deposition (PLD) technique. By carefully selecting deposition conditions and implementing post-treatment procedures, precise control over crystallite orientation relative to the substrate is achieved. Deposition at 450 °C in O2 atmosphere results in random crystallite arrangement, while introducing argon instead of oxygen to the PLD chamber during the initial stage of sputtering exposes the (102) and (011) facets. On the other hand, room temperature deposition leads to the formation of amorphous film, but after appropriate post-annealing treatment, the (00k) facets were exposed. The deposited films are studied using SEM and XRD techniques. Moreover, electrochemical properties of FTO/MoO3 electrodes immersed in 1 M AlCl3 aqueous solution are evaluated using cyclic voltammetry and electrochemical impedance spectroscopy. The results demonstrate that different electrochemical processes are promoted based on the orientation of crystallites. When the (102) and (011) facets are exposed, the Al3+ ions intercalation induced by polarization is facilitated, while the (00k) planes exposure leads to the diminished hydrogen evolution reaction overpotential.

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“…Furthermore, Raman signal enhancement in SERS has been observed in oxide semiconductors such as TiO 2 and Cu 2 O nanoparticles. − These oxide nanomaterials are recognized as semiconductor-based SERS substrates based on their chemical mechanism (CM). The CM process originates from the charge transfer (CT) of electrons between adsorbed target molecules and semiconductor hosts. , This behavior is similar to that of resonant Raman excitation associated with molecular electronic excitation. Previous strategies for oxide semiconductor-based SERS have extensively focused on creating CT processes that resonate with incident photons using vacancy defect-mediated methods that rely on light absorptions in the visible range.…”

Section: Introductionmentioning

confidence: 87%

Plasmon-Free Surface-Enhanced Raman Spectroscopy Using α-Type MoO₃ Semiconductor Nanorods with Strong Light Scattering in the Visible Regime

Yang,

Dang,

et al. 2024

ACS Appl. Mater. Interfaces

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Recent developments in semiconductor-based surface-enhanced Raman scattering (SERS) have achieved numerous advancements, primarily centered on the chemical mechanism. However, the role of the electromagnetic (electromagnetic mechanism) contribution in advancing semiconductor SERS substrates is still underexplored. In this study, we developed a SERS substrate based on densely aligned α-type MoO 3 (α-MoO 3 ) semiconductor nanorods (NRs) with rectangular parallelepiped ribbon shapes with width measuring several hundred nanometers. These structural attributes strongly affect light transport in the visible range by multiple light scattering generated in narrow gaps between NRs, contributing to the improvement of SERS performance. Engineering the nanostructure and chemical composition of NRs realized high SERS sensitivity with an enhancement factor of 2 × 10 8 and a low detection limit of 5 × 10 −9 M for rhodamine 6G (R6G) molecules, which was achieved by the stoichiometric NR sample with strong light scattering. Furthermore, it was observed that the scattering length becomes significantly shorter compared with the excitation wavelength in the visible regime, which indicates that light transport is strongly modified by mesoscopic interference related to Anderson localization. Additionally, high electric fields were found to be localized on the NR surfaces, depending on the excitation wavelength, similar to the SERS response. These optical phenomena indicate that electromagnetic excitation processes play an important role in plasmon-free SERS platforms based on α-MoO 3 NRs. We postulate that our study provides important guidance for designing effective EM-based SERS-active semiconductor substrates.

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Experimental and theoretical evaluation of crystal facet exposure on the charge transfer and SERS activity of ZnO films

Abstract: Semiconductors exhibit great potential as the surface enhanced Raman scattering (SERS) substrate due to their low cost, better stability and biocompatibility. However, the extensive application of semiconductors has been restricted...

Cited by 9 publications

References 53 publications

Crystal Crafting: Controlling Crystallites Orientation and Facet Exposure for Enhanced Electrochemical Properties of Polycrystalline MoO3 Films

Crystal Crafting: Controlling Crystallites Orientation and Facet Exposure for Enhanced Electrochemical Properties of Polycrystalline MoO3 Films

Controlling crystallites orientation and facet exposure for enhanced electrochemical properties of polycrystalline MoO3 films

Plasmon-Free Surface-Enhanced Raman Spectroscopy Using α-Type MoO₃ Semiconductor Nanorods with Strong Light Scattering in the Visible Regime

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Experimental and theoretical evaluation of crystal facet exposure on the charge transfer and SERS activity of ZnO films

Abstract: Semiconductors exhibit great potential as the surface enhanced Raman scattering (SERS) substrate due to their low cost, better stability and biocompatibility. However, the extensive application of semiconductors has been restricted...

Cited by 9 publications

References 53 publications

Crystal Crafting: Controlling Crystallites Orientation and Facet Exposure for Enhanced Electrochemical Properties of Polycrystalline MoO3 Films

Crystal Crafting: Controlling Crystallites Orientation and Facet Exposure for Enhanced Electrochemical Properties of Polycrystalline MoO3 Films

Controlling crystallites orientation and facet exposure for enhanced electrochemical properties of polycrystalline MoO3 films

Plasmon-Free Surface-Enhanced Raman Spectroscopy Using α-Type MoO3 Semiconductor Nanorods with Strong Light Scattering in the Visible Regime

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Product

Resources

About

Plasmon-Free Surface-Enhanced Raman Spectroscopy Using α-Type MoO₃ Semiconductor Nanorods with Strong Light Scattering in the Visible Regime