Chiral Transport of Hot Carriers in Graphene in the Quantum Hall Regime

Cao, Bingchen; Graß, Tobias; Gazzano, Olivier; Patel, Kishan Ashokbhai; Hu, Jingwei; Müller, Markus; Huber, Tobias; Anzi, Luca; Watanabe, Kenji; Taniguchi, Takashi; Newell, David B.; Gullans, Michael; Sordan, Roman; Hafezi, Mohammad; Solomon, Glenn S.

doi:10.1021/acsnano.2c05502

Cited by 4 publications

(3 citation statements)

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“…Complete details of the fabrication are given in the Methods section based on our previous work. [14,35] In short, the fabrication of such a device started with the assembly of an hBN/graphene/hBN stack onto a SiO 2 /Si substrate using a hot pick-up technique (Figure 1(a)). [34] The 1D edges of graphene were exposed on all four sides of the stack, after the stack was shaped in rectangular form by reactiveion etching (RIE) using a hard mask (Figure 1(b)).…”

Section: Resultsmentioning

confidence: 99%

Electrochemistry at the Edge of a van der Waals Heterostructure

Plačkić,

Neubert,

Patel

et al. 2023

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Artificial van der Waals heterostructures, obtained by stacking two‐dimensional (2D) materials, represent a novel platform for investigating physicochemical phenomena and applications. Here, the electrochemistry at the one‐dimensional (1D) edge of a graphene sheet, sandwiched between two hexagonal boron nitride (hBN) flakes, is reported. When such an hBN/graphene/hBN heterostructure is immersed in a solution, the basal plane of graphene is encapsulated by hBN, and the graphene edge is exclusively available in the solution. This forms an electrochemical nanoelectrode, enabling the investigation of electron transfer using several redox probes, e.g., ferrocene(di)methanol, hexaammineruthenium, methylene blue, dopamine and ferrocyanide. The low capacitance of the van der Waals edge electrode facilitates cyclic voltammetry at very high scan rates (up to 1000 V s−1), allowing voltammetric detection of redox species down to micromolar concentrations with sub‐second time resolution. The nanoband nature of the edge electrode allows operation in water without added electrolyte. Finally, two adjacent edge electrodes are realized in a redox‐cycling format. All the above‐mentioned phenomena can be investigated at the edge, demonstrating that nanoscale electrochemistry is a new application avenue for van der Waals heterostructures. Such an edge electrode will be useful for studying electron transfer mechanisms and the detection of analyte species in ultralow sample volumes.

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Section: Resultsmentioning

confidence: 99%

Electrochemistry at the Edge of a van der Waals Heterostructure

Plačkić,

Neubert,

Patel

et al. 2023

Small

Self Cite

View full text Add to dashboard Cite

show abstract

“…Complete details of the fabrication are given in the Methods section based on our previous work. 14,35 In short, the fabrication of such a device started with the assembly of an hBN/graphene/hBN stack onto a SiO2/Si substrate using a hot pick-up technique (Figure 1(a)). 34 The 1D edges of graphene were exposed on all four sides of the stack, after the stack was shaped in rectangular form by reactiveion etching (RIE) using a hard mask (Figure 1(b)).…”

Section: Resultsmentioning

confidence: 99%

Electrochemistry at the edge of a van der Waals heterostructure

Plačkić,

Neubert,

Patel

et al. 2023

Preprint

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Artificial van der Waals heterostructures, obtained by stacking layered two-dimensional materials, represent a novel material platform for investigating physicochemical phenomena and applications. Here, the electrochemistry at the one-dimensional edge of a graphene sheet, which is sandwiched between two hexagonal boron nitride (hBN) multilayer flakes, is reported. When such an hBN/graphene/hBN heterostructure is immersed in a solution, the basal plane of graphene is protected and isolated by the hBN stack, and the edge of the graphene sheet is exclusively available in the solution. This forms an electrochemical nanoelectrode, which enabled the investigation of electron transfer using several redox probes, e.g., ferrocene(di)methanol, hexaammineruthenium, methylene blue, dopamine and ferrocyanide. The relatively low capacitance of the van der Waals edge electrode facilitates cyclic voltammetry at very high scan rates (up to 1000 V/s). Using fast scan cyclic voltammetry imaging, redox species could be detected voltammetrically down to micromolar concentrations with sub-second time resolution at the sandwiched graphene edge, promoted by the rapid equilibration of analyte species in the diffusion layer. Furthermore, the nanoband nature of the edge electrode allows its operation directly in water in the absence of added electrolyte. Finally, two adjacent edge electrodes could be realized in a redox-cycling format. In all, the van der Waals edge electrode is unique among nanoelectrodes as it enables investigations of all the above-mentioned phenomena in the same device. Due to its versatility, it constitutes a new avenue for nanoscale electrochemistry, which will be useful for studying electron transfer mechanisms as well as for the detection of analyte species in ultralow sample volumes.

show abstract

“…Complete details of the fabrication are given in the Methods section based on our previous work. 14,25 In short, the fabrication of such a device started with the assembly of an hBN/graphene/hBN stack onto a SiO2/Si substrate using a hot pick-up technique (Figure 1(a)). 24 The 1D edges of graphene were exposed on all four sides of the stack, after the stack was shaped in rectangular form by reactive-ion etching (RIE) using a hard mask (Figure 1(b)).…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry at the edge of a van der Waals heterostructure

Plačkić,

Neubert,

Patel

et al. 2023

Preprint

View full text Add to dashboard Cite

Artificial van der Waals heterostructures, obtained by stacking layered two-dimensional materials, represent a novel material platform for investigating physicochemical phenomena and applications. We report here electrochemistry at the one-dimensional edge of a graphene sheet, which is sandwiched between two hexagonal boron nitride (hBN) multilayer flakes. When such an hBN/graphene/hBN heterostructure is immersed in a solution, the basal plane of graphene is protected and isolated by the hBN stack, and the edge of the graphene sheet is exclusively available in the solution. This forms an electrochemical nanoelectrode, which enabled us to investigate electron transfer using several redox probes, e.g., ferrocene(di)methanol, hexaammineruthenium, methylene blue, dopamine and ferrocyanide. Facilitated by the relatively low capacitance of the van der Waals edge electrode, we demonstrate cyclic voltammetry at very high scan rates (up to 1000 V/s). Using fast scan cyclic voltammetry imaging, we show that redox species can be detected voltammetrically down to micromolar concentrations with subsecond time resolution at the sandwiched graphene edge, promoted by the rapid equilibration of analyte species in the diffusion layer. Furthermore, the nanoband nature of the edge electrode allows us to work directly in water in the absence of added electrolyte. Finally, we show that two adjacent edge electrodes can be realized in a redox-cycling format. In all, the van der Waals edge electrode is unique among nanoelectrodes as it enables investigations of all the above-mentioned phenomena in the same device. Due to its versatility, it constitutes a new avenue for nanoscale electrochemistry, which will be useful for studying electron transfer mechanisms as well as for the detection of analyte species in ultralow sample volumes.

show abstract

Chiral Transport of Hot Carriers in Graphene in the Quantum Hall Regime

Cited by 4 publications

References 63 publications

Electrochemistry at the Edge of a van der Waals Heterostructure

Electrochemistry at the Edge of a van der Waals Heterostructure

Electrochemistry at the edge of a van der Waals heterostructure

Electrochemistry at the edge of a van der Waals heterostructure

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