Graphene nanogaps for the directed assembly of single-nanoparticle devices

Cully, John; Swett, Jacob L.; Willick, Kyle; Baugh, Jonathan; Mol, Jan A.

doi:10.1039/d1nr01450a

Cited by 8 publications

(10 citation statements)

References 83 publications

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“…As a result, decreases in the electric field strength within the hotspot result in a seamless transition from either the dipolar bonding plasmon to the charge transfer plasmon. A high degree of agreement exists between quantum mechanical theories and experimental results [2]. Quantum tunnelling accounts for the vast majority of the optical response of couples of plasmonic nanoparticles along within close proximity [3].…”

Section: Introductionmentioning

confidence: 73%

Investigations of Optical Coulomb Blockade Oscillations in Plasmonic Nanoparticle Dimers

Gudata¹,

Jule²,

Saka³

et al. 2022

International Journal of Photoenergy

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The exploration of Coulomb blockade oscillations in plasmonic nanoparticle dimers is the subject of this study. When two metal nanoparticles are brought together at the end of their journey, tunnelling current prevents an infinite connection dipolar plasmon and an infinite amplification in the electric fields throughout the hot spot in between nanoparticles from occurring. One way to think about single-electron tunnelling through some kind of quantum dot is to think about Coulomb blockage oscillations in conductance. The electron transport between the dot and source is considered. The model of study is the linear conductance skilled at describing the basic physics of electronic states in the quantum dot. The linear conductance through the dot is defined as G = lim ⟶ 0 I / V in the limit of infinity of small bias voltage. We discuss the classical and quantum metallic Coulomb blockade oscillations. Numerically, the linear conductance was plotted as a function gate voltage. The Coulomb blockade oscillation occurs as gate voltage varies. In the valleys, the conductance falls exponentially as a function gate voltage. As a result of our study, the conductance is constant at high temperature and does not show oscillation in both positive and negative gate voltages. At low temperature, conductance shows oscillation in both positive and negative gate voltages.

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Section: Introductionmentioning

confidence: 73%

Investigations of Optical Coulomb Blockade Oscillations in Plasmonic Nanoparticle Dimers

Gudata¹,

Jule²,

Saka³

et al. 2022

International Journal of Photoenergy

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“…In addition, the volume of type 2 flakes is significantly smaller than that of type 1 flakes. This translates into a lower dielectrophoretic force that may not be able to overcome Brownian motion of the small flakes in the liquid media, as recently described [ 47 ]. DEP positioning is therefore able to selectively move thinner and larger area flakes into specific areas of nanoscale devices.…”

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

“…The exfoliated cylindrite flakes are positioned between the electrodes by dielectrophoresis (DEP) [ 44 , 45 , 46 , 47 ]. Dielectrophoresis has been recently used to position nanostructures such as nanoparticles [ 46 , 47 ], carbon nanotubes [ 48 , 49 , 50 ], and 2D materials [ 38 ] in specific areas of nanoscale devices with high precision. In short: a droplet containing the exfoliated and dispersed cylindrite flakes (Sample 5) is placed on top of a device, covering the inter-electrode area; subsequently, an AC voltage is applied between the tips of the electrodes thus generating an AC electrical field.…”

Section: Resultsmentioning

confidence: 99%

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Optimized Liquid-Phase Exfoliation of Magnetic van der Waals Heterostructures: Towards the Single Layer and Deterministic Fabrication of Devices

Martín-Pérez

Burzurí

2021

Molecules

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Van der Waals magnetic materials are promising candidates for spintronics and testbeds for exotic magnetic phenomena in low dimensions. The two-dimensional (2D) limit in these materials is typically reached by mechanically breaking the van der Waals interactions between layers. Alternative approaches to producing large amounts of flakes rely on wet methods such as liquid-phase exfoliation (LPE). Here, we report an optimized route for obtaining monolayers of magnetic cylindrite by LPE. We show that the selection of exfoliation times is the determining factor in producing a statistically significant amount of monolayers while keeping relatively big flake areas (~1 µm2). We show that the cylindrite lattice is preserved in the flakes after LPE. To study the electron transport properties, we have fabricated field-effect transistors based on LPE cylindrite. Flakes are deterministically positioned between nanoscale electrodes by dielectrophoresis. We show that dielectrophoresis can selectively move the larger flakes into the devices. Cylindrite nanoscale flakes present a p-doped semiconducting behaviour, in agreement with the mechanically exfoliated counterparts. Alternating current (AC) admittance spectroscopy sheds light on the role played by potential barriers between different flakes in terms of electron transport properties. The present large-scale exfoliation and device fabrication strategy can be extrapolated to other families of magnetic materials.

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“…Graphene is a special sp 2 bonded carbon allotrope, which has drawn great attention in the scientific world during the last decade. This is coming from its unique application potential in the fields of nanoelectronics [ 14 ], capacitors [ 15 ] and sensors [ 16 , 17 ]. Nonetheless, pure graphene with no band-gap displayed limited electro-catalytic activity due to the deficient number of active sites.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Nitrogen, Boron Co-Doped Graphene with Enhanced Electro-Catalytic Activity for Cymoxanil Detection

Varodi

Pogăcean

Coroș

et al. 2021

Sensors

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A sample of nitrogen and boron co-doped graphene (NB-Gr) was obtained by the hydrothermal method using urea and boric acid as doping sources. According to XRD analysis, the NB-Gr sample was formed by five-layer graphene. In addition, the XPS analysis confirmed the nitrogen and boron co-doping of the graphene sample. After synthesis, the investigation of the electro-catalytic properties of the bare (GC) and graphene-modified electrode (NB-Gr/GC) towards cymoxanil detection (CYM) was performed. Significant differences between the two electrodes were noticed. In the first case (GC) the peak current modulus was small (1.12 × 10−5 A) and appeared in the region of negative potentials (−0.9 V). In contrast, when NB-Gr was present on top of the GC electrode it promoted the transfer of electrons, leading to a large peak current increase (1.65 × 10−5 A) and a positive shift of the peak potential (−0.75 V). The NB-Gr/GC electrode was also tested for its ability to detect cymoxanil from a commercial fungicide (CURZATE MANOX) by the standard addition method, giving a recovery of 99%.

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Graphene nanogaps for the directed assembly of single-nanoparticle devices

Abstract: Significant advances in the synthesis of low-dimensional materials with unique and tuneable electrical, optical and magnetic properties has led to an explosion of possibilities for realising hybrid nanomaterial devices with...

Cited by 8 publications

References 83 publications

Investigations of Optical Coulomb Blockade Oscillations in Plasmonic Nanoparticle Dimers

Investigations of Optical Coulomb Blockade Oscillations in Plasmonic Nanoparticle Dimers

Optimized Liquid-Phase Exfoliation of Magnetic van der Waals Heterostructures: Towards the Single Layer and Deterministic Fabrication of Devices

Hydrothermal Synthesis of Nitrogen, Boron Co-Doped Graphene with Enhanced Electro-Catalytic Activity for Cymoxanil Detection

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