Toward the Development of Ultrasensitive Detectors for Environmental Applications: A Kinetic Study of Cr(III) Monitoring in Water Using EDTA and SERS Techniques

Traboulsi, Hussein; Awada, Chawki

doi:10.1021/acsomega.0c04844

Cited by 8 publications

(3 citation statements)

References 50 publications

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“…At a 10 mM acid concentration, as shown in Figure S3, the collision frequency stayed relatively the same between these potentials. It is unlikely that the electrostatic interaction plays a big role as in both conditions, the solution pH would be less than 2, which is below the p K a = 3.13 of citric acid surface ligands on the Pt NPs . As such, the Pt NPs should be close to neutral and carry no surface charge when they reach the carbon electrode.…”

Section: Resultsmentioning

confidence: 99%

“…It is unlikely that the electrostatic interaction plays a big role as in both conditions, the solution pH would be less than 2, which is below the pK a = 3.13 of citric acid surface ligands on the Pt NPs. 17 As such, the Pt NPs should be close to neutral and carry no surface charge when they reach the carbon electrode. One hypothesis is that the higher acid concentration and the slower HER rate at lower recording potentials may promote higher H-adsorption signal and easier detection of these adsorption events.…”

Section: Nanoparticle Collision Frequencymentioning

confidence: 99%

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Nanoparticle Adhesion and the Role of Nanobubbles in Single-Particle Collision Electrochemistry

Lewis,

Zhang

2024

J. Phys. Chem. C

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Herein, we report how the collision and electrocatalytic behavior of single platinum nanoparticles (NPs) can be affected by the transient formation of H 2 nanobubbles generated from the hydrogen evolution reaction (HER). The use of a high concentration of acid (0.5 M HClO 4 ) promotes the nucleation of small nanobubbles, allowing us to observe a dramatic decrease in the collision frequency. Adding surfactant molecules and a defoaming agent to the acid solution causes the collision frequency to further decrease and increase, respectively. These observations support our hypothesis about the critical role of the nanobubble in NP adhesion. Our study further reveals the complex chemical nature of the electrode/NP system and the interesting role of transiently formed gas nanobubbles in determining the adhesion probability of individual NPs on an electrode surface.

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Section: Resultsmentioning

confidence: 99%

Section: Nanoparticle Collision Frequencymentioning

confidence: 99%

Nanoparticle Adhesion and the Role of Nanobubbles in Single-Particle Collision Electrochemistry

Lewis,

Zhang

2024

J. Phys. Chem. C

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“…Surface-enhanced Raman scattering (SERS) is an optical technique for surface analysis that amplifies the spontaneous Raman scattering intensity of molecules on or near a substrate by several orders of magnitude. Because of the exceptional sensitivity and selectivity of SERS, it has diverse applications in various fields, such as chemical analysis, biomedical research, and environmental monitoring. , This broad range of applications has attracted significant attention because of continuous advances in the fabrication of SERS-active substrate materials. To date, nanostructures consisting of noble metals (e.g., Au, Ag, and Cu) have been mainly employed as substrate materials for SERS, which are based on the electromagnetic mechanism (EM).…”

Section: Introductionmentioning

confidence: 99%

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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Au‐Nanoparticle‐Array/Aligned‐Ag‐Nanowire‐Based Flexible Dual Plasmonic Substrate for Sensitive Surface‐Enhanced Raman Scattering Detection

Tang

Liu

et al. 2021

Part & Part Syst Charact

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The hot spot density is increased with the result that the Raman signals of molecules absorbed on the noble metallic nanostructures can be significantly enhanced. The noble metal Ag is an ideal candidate for electromagnetic enhancement in SERS because of its excellent SPR. However, the low stability of Ag is the largest challenge for electromagnetic enhancement, as it can be easily oxidized upon exposure to air, which reduces the detection limit of SERS. The noble metal Au exhibits a high stability and good biocompatibility although its SERS activity is inferior to that of Ag. [7] Thus, dual plasmonic structures combined with Ag and Au as SERS substrates are expected to improve the stability and sensitivity of SERS.Generally, dual plasmonic structures combined with Ag and Au are achieved by the galvanic replacement reaction of Ag with Au 3+ . The random distribution and inconsistent size of Au nanoparticles (AuNPs) on the Ag surface hinder the control of the adjacent gap. As a result, their SERS sensitivity is not effectively improved. In particular, the AuNPs on the surface of Ag nanowires (AgNWs) obtained by the galvanic replacement reaction weaken the propagating surface plasmon resonance (PSPR) effect of AgNWs, which is unfavorable for a high SERS sensitivity. [8] When rigid dual plasmonic SERS substrates are applied on uneven and irregular detecting surfaces, the dual plasmonic structures are destroyed, leading to decreased SERS sensitivity and reproducibility. By contrast, dual plasmonic structures incorporated into flexible substrates have excellent mechanical properties, antidamage characteristic, portability, and tailorability, which enable the detection of target molecules on an uneven and irregular surface. [9] Therefore, the development of strategies for the fabrication of dual plasmonic structures and introduction of flexible substrates are important for the development of sensitive and reproducible SERS detection.In this study, we demonstrate a flexible dual plasmonic SERS (FDPS) substrate with high SERS sensitivity and reproducibility, which is composed of aligned AgNWs and AuNP arrays separated by a thin polyurethane (PU) layer. The FDPS substrate achieved a high SERS activity with a detection limitThe fabrication of flexible surface-enhanced Raman scattering (SERS) substrates for sensitive detection on uneven or irregular surfaces is challenging. In this study, a flexible dual plasmonic SERS (FDPS) substrate rationally constructed using Au nanoparticle (AuNP) arrays/aligned Ag nanowires (AgNWs) and elastic polyurethane (PU) is demonstrated. It exhibits high sensitivity (detection limit of 10 −8 m for melamine and 10 −10 m for malachite green) and excellent reproducibility. The well-designed structure of AuNP arrays/aligned AgNWs fabricated using block copolymer self-assembly and oil-water-air interfacial self-assembly successfully enhances the electromagnetic field through plasmonic coupling. In addition, the FDPS substrate retains a high SERS sensitivity after exposure to air at room temperat...

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Toward the Development of Ultrasensitive Detectors for Environmental Applications: A Kinetic Study of Cr(III) Monitoring in Water Using EDTA and SERS Techniques

Cited by 8 publications

References 50 publications

Nanoparticle Adhesion and the Role of Nanobubbles in Single-Particle Collision Electrochemistry

Nanoparticle Adhesion and the Role of Nanobubbles in Single-Particle Collision Electrochemistry

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

Au‐Nanoparticle‐Array/Aligned‐Ag‐Nanowire‐Based Flexible Dual Plasmonic Substrate for Sensitive Surface‐Enhanced Raman Scattering Detection

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Toward the Development of Ultrasensitive Detectors for Environmental Applications: A Kinetic Study of Cr(III) Monitoring in Water Using EDTA and SERS Techniques

Cited by 8 publications

References 50 publications

Nanoparticle Adhesion and the Role of Nanobubbles in Single-Particle Collision Electrochemistry

Nanoparticle Adhesion and the Role of Nanobubbles in Single-Particle Collision Electrochemistry

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

Au‐Nanoparticle‐Array/Aligned‐Ag‐Nanowire‐Based Flexible Dual Plasmonic Substrate for Sensitive Surface‐Enhanced Raman Scattering Detection

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Product

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