Nanostructured graphene for nanoscale electron paramagnetic resonance spectroscopy

Marie, Luke St.; Fatimy, A. El; Hrubý, J.; Němec, Ivan; Hunt, James; Myers-Ward, Rachael L.; Gaskill, D. Kurt; Kruskopf, Mattias; Yang, Yue; Elmquist, Randolph E.; Marx, Raphael; Slageren, Joris van; Neugebauer, Petr; Barbara, Paola

doi:10.1088/2515-7639/ab6af8

Cited by 14 publications

(8 citation statements)

References 40 publications

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“…The magnetic properties of magnetic molecules can be precisely measured by high-frequency electron spin resonance (HF-ESR) both in bulk [11][12][13][14][15][16][17][18][19][20] and on a surface [21][22][23]. Primarily, the Zeeman and zero-field-splitting (ZFS) contributions to the spin Hamiltonian with information about the intrinsic magnetic properties of a molecule can be determined.…”

Section: Introductionmentioning

confidence: 99%

Deposition of Tetracoordinate Co(II) Complex with Chalcone Ligands on Graphene

et al. 2020

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Studying the properties of complex molecules on surfaces is still mostly an unexplored research area because the deposition of the metal complexes has many pitfalls. Herein, we probed the possibility to produce surface hybrids by depositing a Co(II)-based complex with chalcone ligands on chemical vapor deposition (CVD)-grown graphene by a wet-chemistry approach and by thermal sublimation under high vacuum. Samples were characterized by high-frequency electron spin resonance (HF-ESR), XPS, Raman spectroscopy, atomic force microscopy (AFM), and optical microscopy, supported with density functional theory (DFT) and complete active space self-consistent field (CASSCF)/N-electron valence second-order perturbation theory (NEVPT2) calculations. This compound’s rationale is its structure, with several aromatic rings for weak binding and possible favorable π–π stacking onto graphene. In contrast to expectations, we observed the formation of nanodroplets on graphene for a drop-cast sample and microcrystallites localized at grain boundaries and defects after thermal sublimation.

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Section: Introductionmentioning

confidence: 99%

Deposition of Tetracoordinate Co(II) Complex with Chalcone Ligands on Graphene

et al. 2020

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“…Therefore, the absorbed THz power is estimated by evaluating the electrical power at the point in I-V characteristics having the same differential resistance as zero bias differential resistance under radiation OFF and ON conditions. The validity of this concept has been elaborately discussed in our previous reports [18,19,21].…”

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confidence: 90%

Graphene quantum dot bolometer camera: practical approaches and preliminary results

Fatimy¹,

Martyniuk²,

chaudhary³

et al. 2023

Preprint

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Graphene is an exciting candidate for the detection of high-frequency electromagnetic radiation. Here, we have studied the bolometric performance of epitaxial graphene quantum dots (Q.D.s) on the silicon carbide (SiC) substrate in the terahertz (THz) range. The graphene Q.D. having a diameter in the 200 nm range, exhibited an extremely high resistance variation with temperature up to 4.7 MΩ K-1, a crucial parameter for the hot electron bolometers. The graphene Q.D.s bolometers have been fabricated in different geometrical configurations, such as variations in electrode spacing (2.5 and 5.0 μm) and parallelly connected arrays of 4 and 8 Q.D.s. It is demonstrated that the absorbed power can be improved by tuning the bolometer geometrical configuration and the active graphene area, and the electrical responsivity is still very high for an extensive range of absorbed power. Additionally, we report that the photo response of graphene Q.D. bolometer devices is meagerly affected by the presence of a magnetic field as high as 15 T. The results presented here open ways to continue to optimize and realize the chip-scale matrix of the graphene Q.D.s bolometers for THz imaging and magneto-optical spectroscopy applications.

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“…Fig. 7 shows an example of the I/V characteristics of a graphene bolometer [60]. We tested the bolometer response to microwave radiation at 98 GHz (red line).…”

Section: Description Of Sample Holdersmentioning

confidence: 99%

“…irradiation and changes in the bolometer resistance. This represents the characteristic behavior of the bolometer [60].…”

Section: Description Of Sample Holdersmentioning

confidence: 99%

“…A bolometer fabricated from epitaxial graphene on silicon carbide. These bolometers utilized a graphene quantum dot to produce a temperature-dependent resistance [60]. Due to quantum confinement effects, thermal activation is required for conduction across the dot, producing a highly responsive broadband detector at low temperatures.…”

Section: Graphene-based Bolometermentioning

confidence: 99%

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Sample Holders for Sub-THz Electron Spin Resonance Spectroscopy

Sojka

Šedivý

Lagin

et al. 2022

IEEE Trans. Instrum. Meas.

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Electron Spin Resonance (ESR) is a powerful spectroscopic technique used to investigate samples with unpaired electrons in a broad range of scientific fields. High-Frequency ESR (HF-ESR) spectrometers operating at sub-THz frequencies are mostly custom-made with non-standard solutions. This paper presents a set of six different exchangeable sample holders with a fast-loading flange for a sub-THz ESR spectrometer operating at high magnetic fields up to 16 T, and temperature ranges of 4 -400 K. Here, we report on the concept, design, and illustrative measurements of non-resonant ESR sample holders for measurements of samples in a liquid solution, polycrystalline compressed powders, oriented single crystals, electrical devices under sub-THz irradiation, as well as for samples transferred from ultrahigh vacuum (UHV) systems without air contamination. Our solution expands the usage possibilities for HF-ESR spectroscopy, showing that one spectrometer with the presented concept of sample holders enables a wide range of applications.

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Nanostructured graphene for nanoscale electron paramagnetic resonance spectroscopy

Cited by 14 publications

References 40 publications

Deposition of Tetracoordinate Co(II) Complex with Chalcone Ligands on Graphene

Deposition of Tetracoordinate Co(II) Complex with Chalcone Ligands on Graphene

Graphene quantum dot bolometer camera: practical approaches and preliminary results

Sample Holders for Sub-THz Electron Spin Resonance Spectroscopy

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