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Generation of dark solitons in erbium-doped fiber laser based on black phosphorus nanoparticles
摘要： We demonstrate the generation of dark solitons (DSs) in erbium-doped fiber (EDF) laser based on black phosphorus nanoparticles (BPNPs) for the first time. The side-polished fiber deposited with BPNPs is embedded into the laser to enhance the birefringence and nonlinearity of the laser cavity. In the paper, the saturable absorption property of BPNPs with an optical modulation depth of 5.7% and a saturable intensity of 21.7 MW/cm2 are experimentally illustrated. After inserting the BPNPs saturable absorber (SA) into EDF laser, the DSs with repetition rate of 14.68 MHz are obtained at a pump power of 90 mW. Our results prove that the BPNPs are the promising candidate materials for generating DSs in EDF laser.
关键词： Side-polished fiber,Dark solitons,Black phosphorus nanoparticles
更新于2025-11-28 14:24:03
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Black Phosphorus-Film with Drop-Casting Method for High-Energy Pulse Generation From Q-Switched Er-Doped Fiber Laser
摘要： We have reported high-energy pulse generation from a Q-switched Er-doped fiber laser based on black phosphorus (BP) with a drop-casting method. Poly dimethyl diallyl ammonium (PDDA) is employed to protect BP. A passive Q-switching operation is achieved by using the BP/polyvinyl alcohol (PVA) film as the saturable absorbers (SAs). When the pump power increases from 130.4 mW to 378 mW, the repetition rate increases from 13.33 kHz to 26.6 kHz, and the pulse duration decreases from 10.67 μs to 7.11 μs. The maximum pulse energy is 468.03 nJ, to the best of our knowledge, which is the highest pulse energy produced from Q-switched fiber laser based on BP-SA at 1.5 μm. The obtained high-energy pulse demonstrates that BP/PVA film fabricated by such a drop-casting method can provide an ideal SA for high pulse energy generation from fiber lasers, and it has a potential application of remote sensing.
关键词： black phosphorus,Fiber laser,Q-switched
更新于2025-11-28 14:23:57
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Polydopamine-functionalized black phosphorus quantum dots for cancer theranostics
摘要： Black phosphorus (BP) is a promising theranostic agent owing to its excellent photothermal property, biocompatibility and biodegradability. However, the rapid degradation of BP with oxygen and moisture causes the innate instability that is the Achilles’ heel of BP, hindering its further applications in cancer theranostics. Herein, a facile surface passivation strategy was developed to prepare polydopamine (PDA) coated BP quantum dots (QDs) (denoted as BP@PDA) through self-polymerization method. PDA with enriched phenol groups plays as a scavenger of reactive oxygen, which can efficiently prevent the oxidation of BP quantum dots and make them much stable in water (～90% for BP@PDA vs. only 10% for pure BP QDs after 10 days storage). Furthermore, PDA with strong near-infrared (NIR) absorption could greatly improve the photothermal conversion efficiency (PCE) of BP QDs from 22.6% to 64.2% (～2.84-fold higher). Considering the excellent biodegradability and good biocompability of both BP QDs and PDA, the as-prepared BP@PDA hold great potential for cancer theranostics.
关键词： Photoacoustic imaging,Black phosphorus,Photothermal therapy,Cancer theranostics,Polydopamine
更新于2025-11-19 16:56:42
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Black phosphorous sensitized TiO <sub/>2</sub> mesocrystals photocatalyst for hydrogen evolution with visible and near-infrared light irradiation
摘要： Wide absorption from ultraviolet (UV) to near-infrared (NIR) region and enhanced charge separation are two main requirements for promising semiconductor photocatalysts. Here, we studied visible-NIR driven photocatalytic hydrogen evolution over black phosphorus nanosheets/TiO2 mesocrystals loaded with Pt heterostructure (BP NS/ Pt (3 wt%)/TMC TMC). BP NS/Pt (3 wt%)/TMC can harvest photons from UV to NIR and simultaneously has enhanced charge separation to increase the generation of electrons for photocatalytic reduction of water. BP NS/Pt (3 wt%)/TMC exhibited photocatalytic H2 evolution rates of 1.9 and 0.41 μmol h-1 under visible (λ> 420 nm (420-1800 nm)) and NIR (λ> 780 nm (780-1800 nm) irradiation, respectively, compared with 0.3 and 0.10 μmol h-1 for BP NS/Pt (3 wt%)/P25. Moreover, a comparative study was made to examine the effect of thickness of BP NS on the photocatalytic H2 evolution. Femtosecond time-resolved diffused reflectance spectroscopy (fs-TRDRS) was integrated together with photoelectrochemical measurement to shed the light on the importance of charge transfer and separation, confirming that decreasing the thickness of BP NS enhances electron injection from BP NS to TMC to increase the photocatalytic activity.
关键词： hydrogen evolution,Black phosphorus,visible-light photocatalyst,charge carriers dynamics,TiO2 mesocrystals,femtosecond time-resolved diffuse reflectance
更新于2025-11-19 16:51:07
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A wet chemical method for black phosphorus thinning and passivation
摘要： Layered black phosphorus (BP) has been expected to be a promising material for future electronic and optoelectronic applications since its discovery. However, the difficulty in mass fabricating layered air-stable BP severely obstructs its potential industry applications. Here, we report a new BP chemical modification method to implement all-solution based mass production of layered air-stable BP. This method uses the combination of two electron-deficient reagents of 2,2,6,6-tetramethylpiperidinyl-N-oxyl (TEMPO) and triphenylcarbenium tetrafluorobor ([Ph3C]BF4) to accomplish thinning and/or passivation of BP in organic solvent. The field effect transistor and photo detection devices constructed from the chemically modified BP flakes exhibit enhanced performances with environmental stability up to four months. A proof-of-concept BP thin film transistor fabricated through the all-solution based exfoliation and modification displays air-stable and typical p-type transistor behavior. This all-solution based method improves the prospects of BP for industry applications.
关键词： triphenylcarbenium tetrafluorobor,black phosphorus,TEMPO,chemical thinning,covalent functionalization
更新于2025-11-14 17:04:02
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Z-Scheme 2D/2D Heterojunction of Black Phosphorus/Monolayer Bi2WO6 Nanosheets with Enhanced Photocatalytic Activities
摘要： Black phosphorus (BP), a star-shaped two-dimensional material, has attracted considerable attention owing to its unique chemical and physical properties. BP shows great potential in photocatalysis area because of its excellent optical properties; however, its applications in this field have been limited to date. Herein, we design and fabricate a Z-Scheme heterojunction of 2D/2D BP/monolayer Bi2WO6 (MBWO) by a simple and effective method. The BP/MBWO heterojunction exhibits enhanced photocatalytic performance in photocatalytic water splitting to produce H2 and NO removal to purify air; the highest H2 evolution rate of BP/MBWO is 21042 μmol g-1, is 9.15 times that of pristine MBWO and the NO removal ratio was as high as 67%. A Z-Scheme photocatalytic mechanism is proposed based on monitoring of ?O2?, ?OH, NO2, and NO3? species in the reaction. This work broadens applications of BP and highlights its promise in the treatment of environmental pollution and renewable energy issues.
关键词： hydrogen production,photocatalytic,Black phosphorus,2D/2D heterojunction,Z-Scheme
更新于2025-09-23 15:23:52
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Understanding doped perovskite ferroelectrics with defective dipole model
摘要： Leaf stoichiometry (nitrogen (N), phosphorus (P) and N:P ratio) is not only important for studying nutrient composition in forests, but also reflects plant biochemical adaptation to geographic and climate conditions. However, patterns of leaf stoichiometry and controlling factors are still unclear for most species. In this study, we determined leaf N and P stoichiometry and their relationship with soil properties, geographic and climate variables for Cyclocarya paliurus based on a nation-wide dataset from 30 natural populations in China. The mean values of N and P concentrations and N:P ratios were 9.57 mg g?1, 0.91 mg g?1 and 10.51, respectively, indicating that both leaf N and P concentrations in C. paliurus forests were lower than those of China and the global flora, and almost all populations were limited in N concentration. We found significant differences in leaf N and P concentrations and N:P ratios among the sampled C. paliurus populations. However, there were no significant correlations between soil properties (including organic C, total N and P concentrations) and leaf stoichiometry. The pattern of variation in leaf N concentration across the populations was positively correlated with latitude (24.46? N–32.42? N), but negatively correlated with mean annual temperature (MAT); meanwhile, leaf N concentration and N:P ratios were negatively correlated with mean temperature in January (MTmin) and mean annual frost-free period (MAF). Together, these results suggested that temperature-physiological stoichiometry with a latitudinal trend hold true at both global and regional levels. In addition, the relationships between leaf stoichiometry and climate variables provided information on how leaf stoichiometry of this species may respond to climate change.
关键词： N:P ratio,geographic variations,nitrogen,climate variables,Cyclocarya paliurus,phosphorus,natural populations,leaf stoichiometry
更新于2025-09-23 15:23:52
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Facile fabrication of phosphorus-doped g-C3N4 exhibiting enhanced visible light photocatalytic degradation performance toward textile dye
摘要： Phosphorus-doped graphitic carbon nitride (P-g-C3N4) was facilely fabricated by in situ thermal copolymerization of urea and triphenylphosphine source materials. The P-g-C3N4 exhibited an enhanced photocatalytic performance than pristine g-C3N4 counterpart for the degradation of rhodamine B and acid blue D-2BR textile dye under visible light irradiation. X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms, X-ray photoelectron spectra (XPS), and diffuse reflection spectroscopy (DRS) techniques were used to characterized the structure and property of P-g-C3N4 photocatalyst. The phosphorus doping enhanced visible light harvesting and surface area, but also substantially changed the electronic property of g-C3N4 material that could suppress the recombination of photogenerated charge carriers, and thus improved photocatalytic performance.
关键词： Textile dye,Porous photocatalyst,Visible light,Degradation,Phosphorus-doped g-C3N4
更新于2025-09-23 15:23:52
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Phosphorus incorporation into graphitic material via hot pressing of graphite oxide and triphenylphosphine
摘要： It was shown, that the treatment of graphite oxide (GO) at a temperature of 1000 °C and a static pressure of 500 bar recovers the graphene layers. Addition of triphenylphosphine to GO helps in removal of oxygen during the treatment and allows introducing ca. 0.7 at% of phosphorus in the product. Most phosphorus atoms are bonded with oxygen as the 31P nuclear magnetic resonance spectrum showed. An analysis of the X-ray photoelectron P 2p spectrum additionally found the components corresponding to CeP and PeP bonding. Assembling of phosphorus atoms into nanometer clusters was con?rmed by transmission electron microscopy. Raman spectroscopy and electrical conductivity measurements revealed the n-type doping of graphitic material through the incorporation of phosphorus.
关键词： Triphenylphosphine,XPS,Phosphorus doping,NMR,Hot pressing,Graphite oxide
更新于2025-09-23 15:23:52
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Black phosphorus nanosheets based sensitive protease detection and inhibitor screening
摘要： Proteases, as one of the most significant kind of digestive enzymes, are closely related to a variety of physiological processes and diseases. Herein, a black phosphorus nanosheets (BPs) based sensitive fluorometric method for protease detection and inhibitor screening is proposed. The aqueous solution of perylene probe (probe 1) displays a strong fluorescence. BPs, as novel discovered two-dimensional (2D) materials, can adsorb probe 1 through electrostatic interactions, which causes fluorescence quenching of probe 1. Histone can control the interactions between the perylene probe and BPs, which can be further regulated by the introduction of a protease. Thus, the protease activity can be monitored by detecting the fluorescence intensity changes of probe 1. The method is label free, sensitive and selective. As low as 1 ng/mL trypsin can be easily detected.
关键词： trypsin,inhibitor,protease,black phosphorus nanosheets,fluorescence,perylene probe
更新于2025-09-23 15:23:52