DataVXACS NanoPaper
journal article·2015-07-28

Stacking Structures of Few-Layer Graphene Revealed by Phase-Sensitive Infrared Nanoscopy

Deok-Soo Kim, Hyuksang Kwon, Alexey Yu. Nikitin, Seongjin Ahn, Luis Martín-Moreno, Francisco J. García-Vidal, Sunmin Ryu, Hongki Min, Zee Hwan Kim

ACS Nano· Volume 9· Issue 7
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Source abstract

Abstract

The stacking orders in few-layer graphene (FLG) strongly influences the electronic properties of the material. To explore the stacking-specific properties of FLG in detail, one needs powerful microscopy techniques that visualize stacking domains with sufficient spatial resolution. We demonstrate that infrared (IR) scattering scanning near-field optical microscopy (sSNOM) directly maps out the stacking domains of FLG with a nanometric resolution, based on the stacking-specific IR conductivities of FLG. The intensity and phase contrasts of sSNOM are compared with the sSNOM contrast model, which is based on the dipolar tip-sample coupling and the theoretical conductivity spectra of FLG, allowing a clear assignment of each FLG domain as Bernal, rhombohedral, or intermediate stacks for tri-, tetra-, and pentalayer graphene. The method offers 10-100 times better spatial resolution than the far-field Raman and infrared spectroscopic methods, yet it allows far more experimental flexibility than the scanning tunneling microscopy and electron microscopy.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Graphene research and applications · Quantum and electron transport phenomena · Plasmonic and Surface Plasmon Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, Seoul National University, Seoul 136-701, Korea

CIC nanoGUNE Consolider, 20018 Donostia-San Sebastian, Spain

IKERBASQUE Basque Foundation for Science, 48011 Bilbao, Spain

Department of Physics and Astronomy, Seoul National University, Seoul 446-701, Korea

Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC−Universidad de Zaragoza, E-50009 Zaragoza, Spain

Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain

Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 790-784, Korea

Funding

EU Graphene Flagship · National Research Foundation of Korea · Spanish Ministerio de Economia y Competitividad

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