Diamond—the ultimate material for exploring physics of spin-defects for quantum technologies and diamondtronics

Das, Dhruba; Raj, Rahul; Jana, Jayanta; Chatterjee, Subhajit; Ganapathi, K.; Chandran, Maneesh; Rao, M S Ramachandra

doi:10.1088/1361-6463/ac6d89

“…Wolfgang Zeier et al have provided a thorough understanding on the electronic properties, like bandgap, band degeneracy, and effective mass of carriers in relation with the bond length, bond energy, orbital overlap and electronegativity along with the dependency of thermal conductivity on the bond length, bond strength and crystal structure [32]. Diamond shows the thermal conductivity of 2000 Wm −1 K −1 because of strong carbon-carbon covalent bonding and the measured carbon-carbon bond length is 154 pm [39,40]. Octahedrallike chalcogenide compounds bonding mechanism is signalized by large anharmonicity and soft chemical bonds which reduce the lattice thermal conductivity and these compounds bring out strong band anisotropy and huge band degeneracy which accompany to power factor improvements [41,42].…”

Section: Chemical Bondingmentioning

confidence: 99%

Physics and technology of thermoelectric materials and devices

Dadhich

¹

,

Saminathan

²

,

Kumari

³

et al. 2023

J. Phys. D: Appl. Phys.

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The continuous depletion of fossil fuels and the increasing demand for eco-friendly and sustainable energy sources have prompted researchers to look for alternative energy sources. The loss of thermal energy in heat engines (100-350 ºC), coal-based thermal plants (150-700 ºC), heated water pumping in the geothermal process (150-700 ºC), and burning of petrol in the automobiles (150-250 ºC) in form of untapped waste-heat can be directly and/or reversibly converted into usable electricity by means of charge carriers (electrons or holes) as moving fluids using thermoelectric (TE) technology, which works based on typical Seebeck effect. The enhancement in TE conversion efficiency has been a key challenge because of the coupled relation between thermal and electrical transport of charge carriers in a given material. In this review, we have deliberated the physical concepts governing the materials to device performance as well as key challenges for enhancing the TE performance. Moreover, the role of crystal structure in the form of chemical bonding, crystal symmetry, order-disorder and phase transition on charge carrier transport in the material has been explored. Further, this review has also emphasized some insights on various approaches employed recently to improve the TE performance, such as, (i). carrier engineering via band engineering, low dimensional effects, and energy filtering effects and (ii). Phonon engineering via doping/alloying, nano-structuring, embedding secondary phases in the matrix and microstructural engineering. Wehave also briefed the importance of magnetic elements on thermoelectric properties of the selected materials and spin Seebeck effect. Furthermore, the design and fabrication of TE modules and their major challenges are also discussed. As, thermoelectric figure of merit, zT does not have any theoretical limitation, an ideal high performance thermoelectric device should consist of low-cost, eco-friendly, efficient, n- or p-type materials that operate at wide- temperature range and similar coefficients of thermal expansion, suitable contact materials, less electrical/ thermal losses and constant source of thermal energy. Overall, this review provides the recent physical concepts adopted and fabrication procedures of TE materials and device so as to improve the fundamental understanding and to develop a promising TE device.

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“…In the ever-evolving world of materials science, two remarkable substances, diamond, and graphene, have captured the attention of researchers and scientists, each boasting an array of exceptional properties [1,2]. Diamond, the epitome of hardness [3], possesses remarkable mechanical strength [4], chemical inertness [3], and electrical insulation [4], while graphene, a single layer of carbon atoms arranged in a honeycomb lattice [5], shines with exceptional electrical conductivity [6], thermal conductivity [7] and flexibility [8,9].…”

Section: Introductionmentioning

confidence: 99%

Core-shell diamond-graphene needles with silicon-vacancy color centers

Quarshie,

Malykhin,

Kuzhir

2024

Preprint

0

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Color centers in diamond nanostructures open new horizons in biomedicine offering a biocompatible material platform for sensing temperature, pH, and magnetic field. Covering of the color centers enriched diamonds with graphene shell can essentially extend their application potential. Specifically, under irradiation with ultrashort laser pulses, the highly absorptive graphene shell can be used for excitation of a shock acoustic wave capable of cancer cell destruction or could lead to drug photoactivation through the Joule heating. We expect that being nanometrically thin, graphene shells do not suppress the photoluminescence (PL) of the diamond color center allowing synergetic exploitation of both the shell for cell treatment by light absorption and color center sensing. In this letter we demonstrate that Single Crystal Diamond Needles (SCDNs) can be gently covered with graphene shell through vacuum annealing at 900 °C for 30 mins, keeping the response of silicon-vacancy (SiV-) centers.

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“…In the ever-evolving world of materials science, two remarkable substances, diamond, and graphene, have captured the attention of researchers and scientists, each boasting an array of exceptional properties [1,2]. Diamond, the epitome of hardness [3], possesses remarkable mechanical strength [4], chemical inertness [3], and electrical insulation [4], while graphene, a single layer of carbon atoms arranged in a honeycomb lattice [5], shines with exceptional electrical conductivity [6], thermal conductivity [7] and flexibility [8,9].…”

Section: Introductionmentioning

confidence: 99%

Core-shell diamond-graphene needles with silicon-vacancy color centers

Quarshie,

Malykhin,

Kuzhir

2024

Preprint

1

0

View full text Add to dashboard Cite

Color centers in diamond nanostructures open new horizons in biomedicine offering a biocompatible material platform for sensing temperature, pH, and magnetic field. Covering of the color centers enriched diamonds with graphene shell can essentially extend their application potential. Specifically, under irradiation with ultrashort laser pulses, the highly absorptive graphene shell can be used for excitation of a shock acoustic wave capable of cancer cell destruction or could lead to drug photoactivation through the Joule heating. We expect that being nanometrically thin, graphene shells do not suppress the photoluminescence (PL) of the diamond color center allowing synergetic exploitation of both the shell for cell treatment by light absorption and color center sensing. In this letter we demonstrate that Single Crystal Diamond Needles (SCDNs) can be gently covered with graphene shell through vacuum annealing at 900 °C for 30 mins, keeping the response of silicon-vacancy (SiV-) centers.

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Diamond—the ultimate material for exploring physics of spin-defects for quantum technologies and diamondtronics

Cited by 11 publications

References 247 publications

Physics and technology of thermoelectric materials and devices

Physics and technology of thermoelectric materials and devices

Core-shell diamond-graphene needles with silicon-vacancy color centers

Core-shell diamond-graphene needles with silicon-vacancy color centers

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