Investigation of plant leaf-derived graphene quantum dot clusters via magnetic force microscopy

Chiashain Chuang; Masahiro Matsunaga; Tian-Hsin Wang; Prathik Roy; Rini Ravindranath; Meenakshi Ananthula; Nobuyuki Aoki

doi:10.1088/1361-6528/abeadb

Investigation of plant leaf-derived graphene quantum dot clusters via magnetic force microscopy

Nanotechnology. 2021 Mar 23;32(24). doi: 10.1088/1361-6528/abeadb.

Authors

Chiashain Chuang¹, Masahiro Matsunaga², Tian-Hsin Wang¹, Prathik Roy³, Rini Ravindranath³, Meenakshi Ananthula¹, Nobuyuki Aoki⁴

Affiliations

¹ Department of Electronic Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan.
² Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan.
³ Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
⁴ Department of Materials Science, Chiba University, Chiba 263-8522, Japan.

PMID: 33755593
DOI: 10.1088/1361-6528/abeadb

Abstract

Magnetic force microscopy (MFM) is utilized to characterize the magnetic moment in nanostructured plant leaf-derived graphene quantum dot clusters (GQDCs). The MFM signal reveals that the magnetic response of the GQDCs depends on the height and width of the GQDCs. However, individual GQDs, and smaller clusters with widths of less than 20 nm, have not shown any observable magnetic signal. Importantly, experimental analyses suggest that the magnetic signal of GQDCs distributed in a plane can be effectively detected at room temperature. These results could pave the way for future graphene-based magnetic storage media and spin manipulation quantum devices.

Keywords: clusters; graphene; magnetic force microscopy; magnetic moments; magnetism; quantum dots; spin.