公开(公告)号：US20240431215A1

公开(公告)日：2024-12-26

申请号：US18686153

申请日：2022-08-19

Applicant: Versitech Limited

Inventor： Jitae Kim ,  Zhaoyi Xu ,  Zhiqin Chu ,  Lingzhi Wang

IPC: H10N50/01 ,  B41J2/04 ,  B82Y30/00 ,  H10B69/00 ,  H10N50/20

Abstract: A method of fabricating a nitrogen-vacancy (NV) center quantum sensing device based on electrohydrodynamic (EHD) printing. A nanopipette with an aperture at one end is filled with nanodiamond suspension ink so the ink is present in a meniscus at The aperture, the nanodiamond suspension ink comprises nanodiamonds and solvent. The nanopipette is supported above a substrate having a back electrode. A DC is applied pulse between the nanopipette and the back electrode so as to generate an electrostatic attractive force resulting in the ejection of nano-diamond-laden droplets with sub-attoliter volume. The droplet lands on the substrate and is allowed to dry due to solvent evaporation. Using the method, the control of the number of printed nano-diamonds is at will, attaining single-particle level precision. This printing approach, therefore, enables printing NV center arrays with a controlled number directly on the substrate without any lithographic process.