Strong ferromagnetism of g-C3N4 achieved by atomic manipulation

Abstract

Two-dimensional (2D) metal-free ferromagnetic materials are ideal candidates to fabricate next-generation memory and logic devices, but optimization of their ferromagnetism at atomic-scale remains challenging. Theoretically, optimization of ferromagnetism could be achieved by inducing long-range magnetic sequence, which requires short-range exchange interactions. In this work, we propose a strategy to enhance the ferromagnetism of 2D graphite carbon nitride (g-C3N4), which is facilitating the short-range exchange interaction by introducing in-planar boron bridges. As expected, the ferromagnetism of g-C3N4 was significantly enhanced after the introduction of boron bridges, consistent with theoretical calculations. Overall, boosting ferromagnetism of 2D materials by introducing bridging groups is emphasized, which could be applied to manipulate the magnetism of other materials.

Carbon Nitride Pillared Vanadate Via Chemical Pre‐Intercalation Towards High‐Performance Aqueous Zinc‐Ion Batteries

“…Moreover, the Fourier-transform infrared (FTIR) spectrum of the residual solution reveals a new peak appears at 3128 cm À 1 , which can be ascribed to NÀ H vibration in the released NH 4 + ions (Figure S7, Supporting Information). [37,38] Besides, the similar CÀ N peaks can be found in both the FTIR spectra of the residual solution and the C 3 N 4 nanosheets, indicating the generation of small pieces of C 3 N 4 particles during the etching treatment. The existence of NH 4…”

“…In addition, the SEM images reveal the average particle sizes of C 3 N 4 decrease from about 700 nm in length to an average value of 70 nm after the etching reaction (Figure S6, Supporting Information). Moreover, the Fourier‐transform infrared (FTIR) spectrum of the residual solution reveals a new peak appears at 3128 cm −1 , which can be ascribed to N−H vibration in the released NH 4 + ions (Figure S7, Supporting Information) [37, 38] . Besides, the similar C−N peaks can be found in both the FTIR spectra of the residual solution and the C 3 N 4 nanosheets, indicating the generation of small pieces of C 3 N 4 particles during the etching treatment.…”

In Situ Construction of an Intramolecular Donor–Acceptor Conjugated Copolymer via Terephthalic Acid Derived from Plastic Waste for Photocatalysis of Plastic to Hydrogen Peroxide

“…Semiconductor-based photocatalysts can utilize solar energy to activate O 2 for the photocatalytic H 2 O 2 production (PHOP), especially as metal-free graphitic carbon nitride (g-C 3 N 4 ) shows the potential of a 2e – oxygen reduction reaction (ORR) and is suitable for the photocatalysis of PET to H 2 O 2 . , However, the activity of PHOP of pure g-C 3 N 4 is unsatisfactory owing to the high recombination rate of photogenerated electron–hole pairs, the inability of a photocatalyst to efficiently adsorb O 2 , and a sluggish proton-coupled electron transfer process. , An important approach is heterogeneous element doping, such as using P for g-C 3 N 4 , which can not only improve the specific surface area and modulate the band structure but also inhibit the recombination of electron–hole pairs. − Furthermore, P doping can introduce electron spin polarization on the surface of g-C 3 N 4 , thereby avoiding the recombination of photogenerated carriers. , Meanwhile, the introduction of P can improve the PHOP by increasing the adsorption capacity of O 2 . When the P atom is introduced into g-C 3 N 4 by replacing the carbon, the lone-pair electrons of P are delocalized to the π-conjugated tri- s -triazine ring of g-C 3 N 4 and they leave some positively charged P + centers as Lewis acid sites, which can strengthen the Lewis base sites.…”

“…15−17 Furthermore, P doping can introduce electron spin polarization on the surface of g-C 3 N 4 , thereby avoiding the recombination of photogenerated carriers. 18,19 Meanwhile, the introduction of P can improve the PHOP by increasing the adsorption capacity of O 2 . 20 When the P atom is introduced into g-C 3 N 4 by replacing the carbon, the lone-pair electrons of P are delocalized to the π-conjugated tri-s-triazine ring of g-C 3 N 4 and they leave some positively charged P + centers as Lewis acid sites, which can strengthen the Lewis base sites.…”

Strong Room-Temperature Ferromagnetism in Ultrathin NiOOH Nanosheets through Surfactant Manipulation

“…Exploring room-temperature 2D FM materials with tunable spin ordering is still essential. In addition to the anisotropic dimensionality effect, strain , and impurities − can also tune the spin ordering, leading to FM. Although this enhancement is generally weak in antiferromagnetic (antiFM) bulk phases, it can become particularly strong in 2D materials due to the significantly enhanced anisotropic electronic and magnetic structures in their ultrathin geometry. , NiOOH, a layered material which can be readily tuned by doping , and strain engineering, , may be able to be fabricated into a tunable FM 2D material.…”