Plasmonic Imaging of Oxidation and Reduction of Single Gold Nanoparticles and Their Surface Structural Dynamics

Garcia, Adaly; Wang, Shaopeng; Tao, Nongjian; Shan, Xiaonan; Wang, Yixian

doi:10.1021/acssensors.0c02055

Cited by 13 publications

(10 citation statements)

References 22 publications

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“…Therefore, it has a fast imaging speed and a good detection limit. PIM has been used to study electrochemical catalytic reactions, − measure protein interactions, and image the single-cell impedance . However, the PIM needs special plasmonic surfaces, which is usually a thin layer of Au and Ag, as the sensing surface and working electrode.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Imaging on Conductive Surfaces

Shi

Feng

et al. 2021

Anal. Chem.

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Electrochemical impedance spectroscopy (EIS) is a powerful tool to measure and quantify the system impedance. However, EIS only provides an average result from the entire electrode surface. Here, we demonstrated a reflection impedance microscope (RIM) that allows us to image and quantify the localized impedance on conductive surfaces. The RIM is based on the sensitive dependence between the materials' optical properties, such as permittivity, and their local surface charge densities. The localized charge density variations introduced by the impedance measurements will lead to optical reflectivity changes on electrode surfaces. Our experiments demonstrated that reflectivity modulations are linearly proportional to the surface charge density on the electrode and the measurements show good agreement with the simple free electron gas model. The localized impedance distribution was successfully extracted from the reflectivity measurements together with the Randles equivalent circuit model. In addition, RIM is used to quantify the impedance on different conductive surfaces, such as indium tin oxide, gold film, and stainless steel electrodes. A polydimethylsiloxane-patterned electrode surface was used to demonstrate the impedance imaging capability of RIM. In the end, a single-cell impedance imaging was obtained by RIM.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Imaging on Conductive Surfaces

Shi

Feng

et al. 2021

Anal. Chem.

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“…As discussed in 2.2, the chemical reactivity of the NP surface, not restricted to plasmonic NPs, was probed using refractive index-based techniques. Plasmonic-based imaging has been used to differentiate between surface and bulk oxidation (or reduction) for Au NPs or electrodes (129,130). Interferometric scattering microscopy has been more recently introduced to electrochemical studies, although it shows high imaging sensitivity of various charge transfer processes.…”

Section: Surface Alterationmentioning

confidence: 99%

Emerging Optical Microscopy Techniques for Electrochemistry

Lemineur

Wang

et al. 2022

Annual Rev. Anal. Chem.

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An optical microscope is probably the most intuitive, simple, and commonly used instrument to observe objects and discuss behaviors through images. Although the idea of imaging electrochemical processes operando by optical microscopy was initiated 40 years ago, it was not until significant progress was made in the last two decades in advanced optical microscopy or plasmonics that it could become a mainstream electroanalytical strategy. This review illustrates the potential of different optical microscopies to visualize and quantify local electrochemical processes with unprecedented temporal and spatial resolution (below the diffraction limit), up to the single object level with subnanoparticle or single-molecule sensitivity. Developed through optically and electrochemically active model systems, optical microscopy is now shifting to materials and configurations focused on real-world electrochemical applications. Expected final online publication date for the Annual Review of Analytical Chemistry Volume 15 is June 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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“…NTA using multiple lasers of different wavelengths resolves this problem, but a flowing sample is not an option, and this technique comes with a high price tag. , DFM, however, which is used here, has the advantage that it can monitor and differentiate individual NPs in situ and operando in a relatively inexpensive way and can be coupled with a flowing sample and other analytical techniques. This allows physical and chemical information to be obtained from the NPs. − The ability of DFM to image NPs exhibiting localized surface plasmon resonance (LSPR) is especially notable because LSPR scatters specific wavelengths more strongly and results in a higher sensitivity to a particle’s properties than the case for laser-based techniques. , Scattered light is observed through an objective lens, which allows visualization of NPs below the diffraction limit when illuminated by a white light source. This is not achievable with other conventional forms of microscopy ( e.g.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nanoparticles in Diverse Mixtures Using Localized Surface Plasmon Resonance and Nanoparticle Tracking by Dark-Field Microscopy with Redox Magnetohydrodynamics Microfluidics

et al. 2022

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Redox magnetohydrodynamics (RMHD) microfluidics is coupled with dark-field microscopy (DFM) to offer high-throughput single-nanoparticle (NP) differentiation in situ and operando in a flowing mixture by localized surface plasmon resonance (LSPR) and tracking of NPs. The color of the scattered light allows visualization of the NPs below the diffraction limit. Their Brownian motion in 1-D superimposed on and perpendicular to the RMHD trajectory yields their diffusion coefficients. LSPR and diffusion coefficients provide two orthogonal modalities for characterization where each depends on a particle's material composition, shape, size, and interactions with the surrounding medium. RMHD coupled with DFM was demonstrated on a mixture of 82 ± 9 nm silver and 140 ± 10 nm gold-coated silica nanospheres. The two populations of NPs in the mixture were identified by blue/green and orange/red LSPR and their scattering intensity, respectively, and their sizes were further evaluated based on their diffusion coefficients. RMHD microfluidics facilitates high-throughput analysis by moving the sample solution across the wide field of view absent of physical vibrations within the experimental cell. The well-controlled pumping allows for a continuous, reversible, and uniform flow for precise and simultaneous NP tracking of the Brownian motion. Additionally, the amounts of nanomaterials required for the analysis are minimized due to the elimination of an inlet and outlet. Several hundred individual NPs were differentiated from each other in the mixture flowing in forward and reverse directions. The ability to immediately reverse the flow direction also facilitates re-analysis of the NPs, enabling more precise sizing.

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Plasmonic Imaging of Oxidation and Reduction of Single Gold Nanoparticles and Their Surface Structural Dynamics

Cited by 13 publications

References 22 publications

Electrochemical Impedance Imaging on Conductive Surfaces

Electrochemical Impedance Imaging on Conductive Surfaces

Emerging Optical Microscopy Techniques for Electrochemistry

Characterization of Nanoparticles in Diverse Mixtures Using Localized Surface Plasmon Resonance and Nanoparticle Tracking by Dark-Field Microscopy with Redox Magnetohydrodynamics Microfluidics

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