Plasmoelectronic properties of self-assembled gold nanoparticles: impedance spectroscopy experiments combined with numerical simulations

Merle, Louis; Mlayah, Adnen; Grisolia, J.

doi:10.1016/j.mtnano.2023.100332

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…The chemical and physical characteristics of self-assembled nanoparticles (NPs) vary significantly from those of bulk materials, , or even from the corresponding individual NPs. , Considering this fact, NPs have been classified as a new class of functional materials and have found widespread applications in various fields, including electronics, optics, catalysis, and sensing. , Therefore, a precisely controlled method of these NPs in terms of size, shape, and interparticle spacing is essential for fully utilizing their new collective and synergistic features. , NPs, both in colloidal and powdered form, have unique and significant applications in medicine, nanoelectronics, − nanosensors, fundamental research, and other industrial applications. − The uniform size and shape of NPs achieved through various types of synthesis have been overwhelmingly improved to increase the efficiency of NP-based devices in terms of their conductivity, sensitivity, selectivity, etc. However, multiple hurdles have been posed to nanotechnology researchers when it comes to forming NP monolayers on substrates .…”

Section: Introductionmentioning

confidence: 99%

“… 1 , 6 Therefore, a precisely controlled method of these NPs in terms of size, shape, and interparticle spacing is essential for fully utilizing their new collective and synergistic features. 2 , 6 NPs, both in colloidal and powdered form, have unique and significant applications in medicine, 7 nanoelectronics, 8 − 10 nanosensors, 9 fundamental research, 11 and other industrial applications. 12 − 14 The uniform size and shape of NPs achieved through various types of synthesis have been overwhelmingly improved to increase the efficiency of NP-based devices in terms of their conductivity, sensitivity, selectivity, etc.…”

Section: Introductionmentioning

confidence: 99%

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Electric Field-Driven Self-Assembly of Gold Nanoparticle Monolayers on Silicon Substrates

Deader,

Abbas,

Qurashi

et al. 2023

Langmuir

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Nanoparticles (NPs) bridge the gap between bulk materials and their equivalent molecular/atomic counterparts. The physical, optical, and electronic properties of individual NPs alter with the changes in their surrounding environment at the nanoscale. Similarly, the characteristics of thin films of NPs depend on their lateral and volumetric densities. Thus, attaining single monolayers of these NPs would play a vital role in the improved characteristics of semiconductor devices such as nanosensors, field effect transistors, and energy harvesting devices. Developing nanosensors, for instance, requires precise methods to fabricate a monolayer of NPs on selected substrates for sensing and other applications. Herein, we developed a physical fabrication method to form a monolayer of NPs on a planar silicon surface by creating an electric field of intensity 5.71 × 10 4 V/m between parallel plates of a capacitor, by applying a DC voltage. The physics of monolayer formation caused by an externally applied electric field on the gold NPs (Au-NPs) of size 20 nm in diameter and possesses a zeta potential of −250 to −290 mV, is further analyzed with the help of the finite element simulation. The enhanced electric field, in the order of 10 8 V/m, around the Au-NPs indicates a high surface charge density on the NPs, which results in a high electric force per unit area that guides them to settle uniformly on the surface of the silicon substrate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electric Field-Driven Self-Assembly of Gold Nanoparticle Monolayers on Silicon Substrates

Deader,

Abbas,

Qurashi

et al. 2023

Langmuir

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show abstract

“…27,28 However, more recent research has also considered a capacitive behavior to account for the granular nature of nanoparticles. 13,29,30 Building upon these findings, we introduced capacitive and inductive behavior for the AuNPs. Z 2 consists of AuNPs, which are not exposed to light and are underneath the electrode contact.…”

mentioning

confidence: 99%

“…The AuNPs are also modeled with an inductor ( L n1 ) and a capacitor ( C n1 ) in parallel with each other. Previous studies have described nanoparticles with both conductive and inductive components. , However, more recent research has also considered a capacitive behavior to account for the granular nature of nanoparticles. ,, Building upon these findings, we introduced capacitive and inductive behavior for the AuNPs. Z 2 consists of AuNPs, which are not exposed to light and are underneath the electrode contact.…”

mentioning

confidence: 99%

Unconventional Breathing Currents Far beyond the Quantum Tunneling Distances in Large-Gapped Nanoplasmonic Systems

Satheesh,

Yang,

Gaidhane

et al. 2024

Nano Lett.

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Localized surface plasmon resonance (LSPR) in plasmonic nanoparticles propels the field of plasmo-electronics, holding promise for transformative optoelectronic devices through efficient light-to-current conversion. Plasmonic excitations strongly influence the charge distribution within nanoparticles, giving rise to electromagnetic fields that can significantly impact the macroscopic charge flows within the nanoparticle housing material. In this study, we present evidence of ultralow, unconventional breathing currents resulting from dynamic irradiance interactions between widely separated nanoparticles, extending far beyond conventional electron (quantum) tunneling distances. We develop an electric analogue model and derive an empirical expression to elucidate the generation of these unconventional breathing currents in cascaded nanoplasmonic systems under irradiance modulation. This technique and theoretical model have significant potential for applications requiring a deeper understanding of current dynamics, particularly on large nanostructured surfaces relevant to photocatalysis, energy harvesting, sensing, imaging, and the development of future photonic devices.

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Gold Nanoparticles Monolayer Based Field‐Effect Molecular Sensors

Abbas,

Deader,

Qurashi

et al. 2024

Adv Elect Materials

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The rapid and efficient sensing mechanism of molecules and bimolecular species is crucial for healthcare, biomedical, and safety applications. Such sensors need to be robust and able to measure low concentrations of molecular species. Utilizing the intriguing effect of the enhanced electric field from charged gold nanoparticles (Au‐NPs), due to their extremely small size, on the Schottky barrier narrowing and the energy band bending at the interface with Si substrates, a novel sensitive molecular sensor is developed, and presented herein. This is achieved by forming a strip of Au‐NPs monolayer between two metal electrodes on a thin native oxide layer (≈2nm), covering the surface of an n‐type silicon substrate. The high electric field on the negatively charged monolayer of Au‐NPs leads to the depression of the conduction band, thus a tunneling channel of electrons is formed under the monolayer of NPs and beneath the silicon oxide layer. The depth of this tunneling channel can be regulated by modulating the net charge, hence the electric field, on the NPs when they are exposed to various polar or charged molecules. This effective nano‐sensing platform can be explored for the detection and analysis of various molecules of interest.

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Plasmoelectronic properties of self-assembled gold nanoparticles: impedance spectroscopy experiments combined with numerical simulations

Cited by 4 publications

References 31 publications

Electric Field-Driven Self-Assembly of Gold Nanoparticle Monolayers on Silicon Substrates

Electric Field-Driven Self-Assembly of Gold Nanoparticle Monolayers on Silicon Substrates

Unconventional Breathing Currents Far beyond the Quantum Tunneling Distances in Large-Gapped Nanoplasmonic Systems

Gold Nanoparticles Monolayer Based Field‐Effect Molecular Sensors

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