Open AccessHeteroepitaxial spherical electroless Au-plated Pt-based nanogap electrodes of radius 5 nm and gap separation 0.7 nm
Author(s) -
Yoon Young Choi,
Ain Kwon,
Yutaka Majima
Publication year - 2019
Publication title -
applied physics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.911
H-Index - 94
eISSN - 1882-0786
pISSN - 1882-0778
DOI - 10.7567/1882-0786/ab51df
Subject(s) - materials science , electrode , scanning electron microscope , annealing (glass) , crystallite , transmission electron microscopy , laser linewidth , optoelectronics , nanotechnology , optics , chemistry , composite material , metallurgy , laser , physics
Heteroepitaxial growth is demonstrated by electroless Au plating (ELGP) on polycrystalline Pt surface and initial ultrafine-linewidth Pt nanogap electrodes, confirmed by scanning transmission electron microscope cross-sectional images, atomic-resolution scanning electron microscope images, and energy-dispersive X-ray spectroscopy elemental maps. The gap between a pair of spherical multidomain heteroepitaxial Au on Pt electrodes of radius 5 nm is controlled to a value as small as 0.7 nm by the self-termination mechanism of ELGP without short circuit. The heteroepitaxial spherical Au/Pt nanogap electrodes are found to be robust against annealing at temperatures up to 573 K.