Defect-related ferromagnetism in ultrathin metal-free g-C3N4 nanosheets

Gao, Daqiang; Xu, Qiang; Zhang, Jing; Zuo, Yi; Si, Mingsu; Yan, Ze; Xue, Desheng

doi:10.1039/c3nr04743a

Cited by 174 publications

(91 citation statements)

References 39 publications

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“…S2) show that the SSA and pore volume of the NMGCN powder are about 220 m 2 , confirming the presence of more photocatalytic active sites in the NMGCNs. This is further confirmed by the ferromagnetic measurements because theoretical and experimental studies suggest that the ultrathin GCNNs show intrinsic ferromagnetism at room temperature due to the presence of hydrogen dangling bonds [28,48]. As expected, the M-H curves of NMGCNs and GCNNs show an obvious hysteresis loop with saturation magnetization (Fig.…”

Section: Resultssupporting

confidence: 68%

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Reduced-sized monolayer carbon nitride nanosheets for highly improved photoresponse for cell imaging and photocatalysis

Liang

Bai

et al. 2016

Sci. China Mater.

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Two-dimensional graphitic carbon nitride (g-C3N4) nanosheets (GCNNs) have been considered as an attractive metal-free semiconductor because of their superior catalytic, optical, and electronic properties. However, it is still challenging to prepare monolayer GCNNs with a reduced lateral size in nanoscale. Herein, a highly efficient ultrasonic technique was used to prepare nanosized monolayer graphitic carbon nitride nanosheets (NMGCNs) with a thickness of around 0.6 nm and an average lateral size of about 55 nm. With a reduced lateral size yet monolayer thickness, NMGCNs show unique photo-responsive properties as compared to both large-sized GCNNs and GCN quantum dots. A dispersion of NMGCNs in water has good stability and exhibits strong blue fluorescence with a high quantum yield of 32%, showing good biocompatibility for cell imaging. Besides, compared to the multilayer GCNNs, NMGCNs show a highly improved photocatalysis under visible light irradiation. Overall, NMGCNs, characterized with monolayer and nanosized lateral dimension, fill the gap between large size (very high aspect ratio) and quantum dot-like counterparts, and show great potential applications as sensors, photo-related and electronic devices.

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Section: Resultssupporting

confidence: 68%

“…S11). However, the saturation magnetization (Ms) value of the NMGCNs reaches 0.04 emu g −1 , which is about five times larger than that for the GCNNs (0.008 emu g −1 ) and also much higher than previously reported values for the ultrathin GCNNs [28,48]. Notably, this is the highest Ms value among the previous reports for GCN.…”

Section: Resultsmentioning

confidence: 57%

Reduced-sized monolayer carbon nitride nanosheets for highly improved photoresponse for cell imaging and photocatalysis

Liang

Bai

et al. 2016

Sci. China Mater.

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“…It has been previously reported that carbon vacancies can induce the ferromagnetism in GCN at room temperature owing to spin-polarized conduction electrons in the spin-down branch. [ 25 ] Thus, this assumption can be confi rmed by the magnetic measurements. An obvious hysteresis hoop is observed in the curve of the magnetic fi eld dependence of the magnetization ( M-H ) recorded at 300 K ( Figure S4, Supporting Information), confi rming the room-temperature ferromagnetism of HGCN.…”

Section: Resultsmentioning

confidence: 94%

Holey Graphitic Carbon Nitride Nanosheets with Carbon Vacancies for Highly Improved Photocatalytic Hydrogen Production

Liang

Huang

et al. 2015

Adv Funct Materials

944

455

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2D graphitic carbon nitride (GCN) nanosheets have attracted tremendous attention in photocatalysis due to their many intriguing properties. However, the photocatalytic performance of GCN nanosheets is still restricted by the limited active sites and the serious aggregation during the photocatalytic process. Herein, a simple approach to produce holey GCN (HGCN) nanosheets with abundant in‐plane holes by thermally treating bulk GCN (BGCN) under an NH3 atmosphere is reported. These formed in‐plane holes not only endow GCN nanosheets with more exposed active edges and cross‐plane diffusion channels that greatly speed up mass and photogenerated charge transfer, but also provide numerous boundaries and thus decrease the aggregation. Compared to BGCN, the resultant HGCN has a much higher specific surface area of 196 m2 g−1, together with an enlarged bandgap of 2.95 eV. In addition, the HGCN is demonstrated to be self‐modified with carbon vacancies that make HGCN show much broader light absorption extending to the near‐infrared region, a higher donor density, and remarkably longer lifetime of charge carriers. As such, HGCN has a much higher photocatalytic hydrogen production rate of nearly 20 times the rate of BGCN.

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“…Five peaks obtained from the deconvolution of the C-1s peak are centered at 284.7 eV (C=C), 285.3 eV (C-C, C-H), 286.4 eV (C-OH), 287.3 eV (C-O-C) and 288.3 eV (C=O). 22 The numerous functional groups enable K-GQDs to have good solubility in water. The intensity of the peaks at 284.7 eV and 285.3 eV are stronger, meaning that C=C, C-C and C-H are the major chemical configuration in K-GQDs, in particular, C=C is related to sp 2 hybridization while C-C and C-H are related to the sp the K-2p 3/2 orbitals are present at 294.2 eV and 294.5 eV.…”

Section: Resultsmentioning

confidence: 99%

Potassium doping: Tuning the optical properties of graphene quantum dots

Qian

Tang

et al. 2016

AIP Advances

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Doping with hetero-atoms is an effective way to tune the properties of graphene quantum dots (GQDs). Here, potassium-doped GQDs (K-GQDs) are synthesized by a one-pot hydrothermal treatment of sucrose and potassium hydroxide solution. Optical properties of the GQDs are altered as a result of K-doping. The absorption peaks exhibit a blue shift. Multiple photoluminescence (PL) peaks are observed as the excitation wavelength is varied from 380 nm to 620 nm. New energy levels are introduced into the K-GQDs and provide alternative electron transition pathways. The maximum PL intensity of the K-GQDs is obtained at an excitation wavelength of 480 nm which is distinct from the undoped GQDs (375 nm). The strong PL of the K-GQDs at the longer emission wavelengths is expected to make K-GQDs more suitable for bioimaging and optoelectronic applications.

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Defect-related ferromagnetism in ultrathin metal-free g-C3N4 nanosheets

Cited by 174 publications

References 39 publications

Reduced-sized monolayer carbon nitride nanosheets for highly improved photoresponse for cell imaging and photocatalysis

Reduced-sized monolayer carbon nitride nanosheets for highly improved photoresponse for cell imaging and photocatalysis

Holey Graphitic Carbon Nitride Nanosheets with Carbon Vacancies for Highly Improved Photocatalytic Hydrogen Production

Potassium doping: Tuning the optical properties of graphene quantum dots

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