Rhombohedral stacking-faults in exfoliated highly oriented pyrolytic graphite

Filippo Boi; Cheng Yang Lee; Shanling Wang; Hansong Wu; Lei Li; Lin Zhang; Jiaxin Song; Yixin Dai; Ayoub Taallah; Omololu Odunmbaku; Anna Corrias; Aleksandra Baron-Wiechec; Shuping Zheng; Salvatore Grasso

doi:10.1016/j.cartre.2024.100345

Rhombohedral stacking-faults in exfoliated highly oriented pyrolytic graphite

Filippo Boi^*, Cheng Yang Lee, Shanling Wang, Hansong Wu, Lei Li, Lin Zhang, Jiaxin Song, Yixin Dai, Ayoub Taallah, Omololu Odunmbaku, Anna Corrias, Aleksandra Baron-Wiechec, Shuping Zheng, Salvatore Grasso^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The recent observation of possible granular superconductivity in highly oriented pyrolytic graphite (HOPG) has attracted significant research interest. Here we report a novel investigation on the structural-properties of exfoliated-HOPG. We investigated two types of exfoliation methods, involving either a full (method-1) or partial (method-2) contact between adhesive tape and the main HOPG. Structural characterization was obtained by employing X-ray diffraction (XRD), Raman spectroscopy and electron microscopy (SEM). In particular, Raman point and mapping spectroscopy revealed significant structural-transitions from ABA (Bernal) to ABC (rhombohedral) stacking (stacking-faults), in those samples obtained with the method-2. Interestingly, strained regions exhibiting structural-deformations with a ridge-like morphology were reproducibly identified. The acquired Raman-spectra revealed a local enhancement of the D and D’ bands-intensity together with contributions arising from Electronic Raman Scattering (ERS) across the band-gap of rhombohedral-graphite, at middle (∼1870 cm⁻¹) and high (∼ 2680 cm⁻¹) frequency. HRTEM of the samples produced with the method-2 allowed also for the identification of local-coexistence of ripplocation-like defects with moiré superlattices, an indicator of non-uniform c-axis configuration.

Original language	English
Article number	100345
Journal	Carbon Trends
Volume	15
DOIs	https://doi.org/10.1016/j.cartre.2024.100345
State	Published - Jun 2024

Keywords

Exfoliation
HOPG
Rhombohedral-graphite

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10.1016/j.cartre.2024.100345

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title = "Rhombohedral stacking-faults in exfoliated highly oriented pyrolytic graphite",

abstract = "The recent observation of possible granular superconductivity in highly oriented pyrolytic graphite (HOPG) has attracted significant research interest. Here we report a novel investigation on the structural-properties of exfoliated-HOPG. We investigated two types of exfoliation methods, involving either a full (method-1) or partial (method-2) contact between adhesive tape and the main HOPG. Structural characterization was obtained by employing X-ray diffraction (XRD), Raman spectroscopy and electron microscopy (SEM). In particular, Raman point and mapping spectroscopy revealed significant structural-transitions from ABA (Bernal) to ABC (rhombohedral) stacking (stacking-faults), in those samples obtained with the method-2. Interestingly, strained regions exhibiting structural-deformations with a ridge-like morphology were reproducibly identified. The acquired Raman-spectra revealed a local enhancement of the D and D{\textquoteright} bands-intensity together with contributions arising from Electronic Raman Scattering (ERS) across the band-gap of rhombohedral-graphite, at middle (∼1870 cm−1) and high (∼ 2680 cm−1) frequency. HRTEM of the samples produced with the method-2 allowed also for the identification of local-coexistence of ripplocation-like defects with moir{\'e} superlattices, an indicator of non-uniform c-axis configuration.",

keywords = "Exfoliation, HOPG, Rhombohedral-graphite",

author = "Filippo Boi and Lee, {Cheng Yang} and Shanling Wang and Hansong Wu and Lei Li and Lin Zhang and Jiaxin Song and Yixin Dai and Ayoub Taallah and Omololu Odunmbaku and Anna Corrias and Aleksandra Baron-Wiechec and Shuping Zheng and Salvatore Grasso",

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year = "2024",

month = jun,

doi = "10.1016/j.cartre.2024.100345",

language = "英语",

volume = "15",

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T1 - Rhombohedral stacking-faults in exfoliated highly oriented pyrolytic graphite

AU - Boi, Filippo

AU - Lee, Cheng Yang

AU - Wang, Shanling

AU - Wu, Hansong

AU - Li, Lei

AU - Zhang, Lin

AU - Song, Jiaxin

AU - Dai, Yixin

AU - Taallah, Ayoub

AU - Odunmbaku, Omololu

AU - Corrias, Anna

AU - Baron-Wiechec, Aleksandra

AU - Zheng, Shuping

AU - Grasso, Salvatore

PY - 2024/6

Y1 - 2024/6

N2 - The recent observation of possible granular superconductivity in highly oriented pyrolytic graphite (HOPG) has attracted significant research interest. Here we report a novel investigation on the structural-properties of exfoliated-HOPG. We investigated two types of exfoliation methods, involving either a full (method-1) or partial (method-2) contact between adhesive tape and the main HOPG. Structural characterization was obtained by employing X-ray diffraction (XRD), Raman spectroscopy and electron microscopy (SEM). In particular, Raman point and mapping spectroscopy revealed significant structural-transitions from ABA (Bernal) to ABC (rhombohedral) stacking (stacking-faults), in those samples obtained with the method-2. Interestingly, strained regions exhibiting structural-deformations with a ridge-like morphology were reproducibly identified. The acquired Raman-spectra revealed a local enhancement of the D and D’ bands-intensity together with contributions arising from Electronic Raman Scattering (ERS) across the band-gap of rhombohedral-graphite, at middle (∼1870 cm−1) and high (∼ 2680 cm−1) frequency. HRTEM of the samples produced with the method-2 allowed also for the identification of local-coexistence of ripplocation-like defects with moiré superlattices, an indicator of non-uniform c-axis configuration.

AB - The recent observation of possible granular superconductivity in highly oriented pyrolytic graphite (HOPG) has attracted significant research interest. Here we report a novel investigation on the structural-properties of exfoliated-HOPG. We investigated two types of exfoliation methods, involving either a full (method-1) or partial (method-2) contact between adhesive tape and the main HOPG. Structural characterization was obtained by employing X-ray diffraction (XRD), Raman spectroscopy and electron microscopy (SEM). In particular, Raman point and mapping spectroscopy revealed significant structural-transitions from ABA (Bernal) to ABC (rhombohedral) stacking (stacking-faults), in those samples obtained with the method-2. Interestingly, strained regions exhibiting structural-deformations with a ridge-like morphology were reproducibly identified. The acquired Raman-spectra revealed a local enhancement of the D and D’ bands-intensity together with contributions arising from Electronic Raman Scattering (ERS) across the band-gap of rhombohedral-graphite, at middle (∼1870 cm−1) and high (∼ 2680 cm−1) frequency. HRTEM of the samples produced with the method-2 allowed also for the identification of local-coexistence of ripplocation-like defects with moiré superlattices, an indicator of non-uniform c-axis configuration.

KW - Exfoliation

KW - HOPG

KW - Rhombohedral-graphite

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DO - 10.1016/j.cartre.2024.100345

M3 - 文章

AN - SCOPUS:85188906923

SN - 2667-0569

VL - 15

JO - Carbon Trends

JF - Carbon Trends

M1 - 100345

ER -

Rhombohedral stacking-faults in exfoliated highly oriented pyrolytic graphite

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Keywords

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