A graphene-based hybrid material with quantum bits prepared by the double Langmuir–Schaefer method

A graphene-based hybrid material with quantum bits prepared by the double Langmuir–Schaefer method

WoS Article

The scalability and stability of molecular qubits deposited on surfaces is a crucial step for incorporating them into upcoming electronic devices. Herein, we report on the preparation and characterisation of a molecular quantum bit, copper(II)dibenzoylmethane [Cu(dbm)2], deposited by a modified Langmuir–Schaefer (LS) technique onto a graphene-based substrate. A double LS deposition was used for the preparation of a few-layer-graphene (FLG) on a Si/SiO2 substrate with subsequent deposition of the molecules. Magnetic properties were probed by high-frequency electron spin resonance (HF-ESR) spectroscopy and found maintained after deposition. Additional spectroscopic and imaging techniques, such as Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM) were performed to characterise the deposited sample. Our approach demonstrated the possibility to utilise a controlled wet-chemistry protocol to prepare an array of potential quantum bits on a disordered graphene-based substrate. The deployed spectroscopic techniques showed unambiguously the robustness of our studied system with a potential to fabricate large-scale, intact, and stable quantum bits.

The scalability and stability of molecular qubits deposited on surfaces is a crucial step for incorporating them into upcoming electronic devices. Herein, we report on the preparation and characterisation of a molecular quantum bit, copper(II)dibenzoylmethane [Cu(dbm)2], deposited by a modified Langmuir–Schaefer (LS) technique onto a graphene-based substrate. A double LS deposition was used for the preparation of a few-layer-graphene (FLG) on a Si/SiO2 substrate with subsequent deposition of the molecules. Magnetic properties were probed by high-frequency electron spin resonance (HF-ESR) spectroscopy and found maintained after deposition. Additional spectroscopic and imaging techniques, such as Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM) were performed to characterise the deposited sample. Our approach demonstrated the possibility to utilise a controlled wet-chemistry protocol to prepare an array of potential quantum bits on a disordered graphene-based substrate. The deployed spectroscopic techniques showed unambiguously the robustness of our studied system with a potential to fabricate large-scale, intact, and stable quantum bits.

Atomic force microscopy, Copper compounds, Deposition, Graphene, Hybrid materials, Magnetic moments, Quantum computers, Scanning electron microscopy, Substrates, X ray photoelectron spectroscopy

Atomic force microscopy, Copper compounds, Deposition, Graphene, Hybrid materials, Magnetic moments, Quantum computers, Scanning electron microscopy, Substrates, X ray photoelectron spectroscopy

HRUBÝ, J.; SANTANA, V.; KOSTIUK, D.; BOUČEK, M.; LENZ, S.; KERN, M.; ŠIFFALOVIČ, P.; VAN SLAGEREN, J.; NEUGEBAUER, P.

2020

01.08.2019

2046-2069

RSC Advances

9

42

United Kingdom of Great Britain and Northern Ireland

24066

24073

8

https://pubs.rsc.org/en/content/articlelanding/2019/RA/C9RA04537F#!divAbstract

http://hdl.handle.net/11012/209150

c9ra04537f