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Jadwisienczak, Wojciech
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Publications (6/6 displayed)
- 2024Superparamagnetic properties of metal-free nitrogen-doped graphene quantum dotscitations
- 2023Structural, optical, and electrical properties of TiO$_2$ thin films deposited by ALD: Impact of the substrate, the deposited thickness and the deposition temperaturecitations
- 2023Toward an Insulator-to-Metal Transition (IMT) in VOx Deposited by ALD: Huge Effect on Large IR Transmission Range
- 2023Strontium Vanadate Deposited by ALD: Toward a New Synthesis Approach
- 2022Growth and study of Tb$^{3+}$ doped Nb$_2$O$_5$ thin films by radiofrequency magnetron sputtering: photoluminescence propertiescitations
- 2018(Invited) Naked Eye Blue Emission in Ce 3+ Codoped SiO x N y : Toward Si-Based Light-Emitting Devices
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article
Superparamagnetic properties of metal-free nitrogen-doped graphene quantum dots
Abstract
<jats:p>This article reports the superparamagnetic behavior of metal-free nitrogen-doped graphene quantum dots (N-GQDs). The pulsed laser ablation (PLA) method was utilized to synthesize N-GQDs with an average diameter of 3.45 nm and a high doping level (N/C) of 1.4. Magnetic properties of as-synthesized N-GQDs were explored by performing magnetization vs magnetic field (M–H) and magnetization vs temperature (M–T) measurements. M–H plots measured in a temperature range of 2–300 K revealed the superparamagnetic behavior of N-GQDs. The value of saturation magnetization was found to be directly correlated to nitrogen concentration and a saturation magnetization up to 28.7 emu/g was obtained at room temperature (300 K). M–T measurements with zero-field-cooled (ZFC) and field-cooled (FC) conditions were employed to study anisotropy energy barriers and blocking temperature. A variation in the blocking temperature (TB) from 288 to 61 K was observed when the external magnetic field (H) was changed from 0.1 to 0.6 T. The origin of superparamagnetism was attributed to the presence of graphitic nitrogen bonding configuration and defect states. The observed superparamagnetic properties along with the optical properties of N-GQDs create an opportunity for developing materials for biomedical applications and data recording devices.</jats:p>