Morphology-Dependent Voltage Sensitivity of a Gold Nanostructure

Huang, Yu; Pitter, Mark C.; Somekh, Michael Geoffrey

doi:10.1021/la202983d

Cited by 21 publications

(32 citation statements)

References 35 publications

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“… 18 − 29 Chemically prepared nanoparticles are inherently heterogeneous in size and shape even under identical growth conditions, leading to heterogeneity in catalytic and electrochemical activity within nanoparticle populations. 3 , 7 , 8 , 30 , 31 Additionally, surface defect sites have been shown to increase nanocatalyst activity. 32 , 33 The synthesis of nanocatalysts has historically relied heavily on iterative trial and error optimization schemes.…”

Section: Introductionmentioning

confidence: 99%

Single-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmon

et al. 2014

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A hyperspectral imaging method was developed that allowed the identification of heterogeneous plasmon response from 50 nm diameter gold colloidal particles on a conducting substrate in a transparent three-electrode spectroelectrochemical cell under non-Faradaic conditions. At cathodic potentials, we identified three distinct behaviors from different nanoparticles within the same sample: irreversible chemical reactions, reversible chemical reactions, and reversible charge density tuning. The irreversible reactions in particular would be difficult to discern in alternate methodologies. Additional heterogeneity was observed when single nanoparticles demonstrating reversible charge density tuning in the cathodic regime were measured dynamically in anodic potential ranges. Some nanoparticles that showed charge density tuning in the cathodic range also showed signs of an additional chemical tuning mechanism in the anodic range. The expected changes in nanoparticle free-electron density were modeled using a charge density-modified Drude dielectric function and Mie theory, a commonly used model in colloidal spectroelectrochemistry. Inconsistencies between experimental results and predictions of this common physical model were identified and highlighted. The broad range of responses on even a simple sample highlights the rich experimental and theoretical playgrounds that hyperspectral single-particle electrochemistry opens.

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Section: Introductionmentioning

confidence: 99%

Single-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmon

et al. 2014

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“…The resonance wavelength shift linearly scales with the applied potential, whereas the switching speed is dominated by the "RC" charging time of the EDL. A key demonstration of non-Faradaic charging effects was reported by Huang et al [202,206]. In their experiments, they demonstrated that the scattering efficiency of PNAs can be modulated through non-Faradaic charging processes using an external electrode.…”

Section: Electrical Gatingmentioning

confidence: 88%

“…Compared to electrical biasing in a dielectric medium, electrical gating within an ionic medium (i.e., liquid-or solid-state electrolyte solution) can lead to stronger LSPR modulations [199,200]. Plasmonic response in ionic media can be tuned through non-Faradaic [201,202] and Faradaic [203][204][205] charging effects. In non-Faradaic processes, application of an electrical potential difference between a PNA and a reference electrode results in the formation of an atomic scale (∼Å) electrical double layer (EDL) on the nanostructure surface.…”

Section: Electrical Gatingmentioning

confidence: 99%

Active plasmonic nanoantenna: an emerging toolbox from photonics to neuroscience

et al. 2020

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Concepts adapted from radio frequency devices have brought forth subwavelength scale optical nanoantenna, enabling light localization below the diffraction limit. Beyond enhanced light–matter interactions, plasmonic nanostructures conjugated with active materials offer strong and tunable coupling between localized electric/electrochemical/mechanical phenomena and far-field radiation. During the last two decades, great strides have been made in development of active plasmonic nanoantenna (PNA) systems with unconventional and versatile optical functionalities that can be engineered with remarkable flexibility. In this review, we discuss fundamental characteristics of active PNAs and summarize recent progress in this burgeoning and challenging subfield of nano-optics. We introduce the underlying physical mechanisms underpinning dynamic reconfigurability and outline several promising approaches in realization of active PNAs with novel characteristics. We envision that this review will provide unambiguous insights and guidelines in building high-performance active PNAs for a plethora of emerging applications, including ultrabroadband sensors and detectors, dynamic switches, and large-scale electrophysiological recordings for neuroscience applications.

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“…The plasmon resonance of metal nanostructures can also be modulated by applying an external electrostatic field to alter their free electron density . For instance, increasing the free electron density in a metal nanostructure leads to a stronger electron oscillation and induces a blue shift in the plasmon resonance wavelength, leading to red shift and damping of the plasmonic band to make reversible switches . However, the aforementioned strategies only yield switches of relatively low sensitivity (ON/OFF ratio <5), which present a formidable challenge for practical applications of active plasmonic switch devices.…”

Section: Introductionmentioning

confidence: 99%

“…[34][35][36][37][38] For instance, increasing the free electron density in a metal nanostructure leads to a stronger electron oscillation and induces a blue shift in the plasmon resonance wavelength, leading to red shift and damping of the plasmonic band to make reversible switches. [39][40][41] However, the aforementioned strategies only yield switches of relatively low sensitivity (ON/OFF ratio <5), which present a formidable challenge for practical applications of active plasmonic switch devices.As we know, surface-enhanced Raman spectroscopy (SERS) is a well-established spectroscopic technique for ultrasensitive sensing and probing the plasmonic responses of metal nanoparticles. [42][43][44][45] The effectiveness of the technique is due to the fact that the intensity of the plasmon resonance peak is related to electric fi eld ( E ) of plasmonic nanoparticles and the enhancement of the Raman signal is proportional to E 4 , thus inducing a dramatic response.…”

mentioning

confidence: 99%

Highly Sensitive Electro‐Plasmonic Switches Based on Fivefold Stellate Polyhedral Gold Nanoparticles

Zhong

Yue

Liow

et al. 2015

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Electron-photon coupling in metal nanostructures has raised a new trend for active plasmonic switch devices in both fundamental understanding and technological applications. However, low sensitivity switches with an on/off ratio less than 5 have restricted applications. In this work, an electrically modulated plasmonic switch based on a surface-enhanced Raman spectroscopy (SERS) system with a single fivefold stellate polyhedral gold nanoparticle (FSPAuNP) is reported. The reversible switch of the SERS signal shows high sensitivity with an on/off ratio larger than 30. Such a high on/off ratio arises primarily from the plasmonic resonance shift of the FSPAuNP with the incident laser due to the altered free electron density on the nanoparticle under an applied electrochemical potential. This highly sensitive electro-plasmonic switch may enable further development of plasmonic devices.

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Morphology-Dependent Voltage Sensitivity of a Gold Nanostructure

Cited by 21 publications

References 35 publications

Single-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmon

Single-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmon

Active plasmonic nanoantenna: an emerging toolbox from photonics to neuroscience

Highly Sensitive Electro‐Plasmonic Switches Based on Fivefold Stellate Polyhedral Gold Nanoparticles

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