ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 29
·2401490
·
IF 18.5
Bolong Wang,Bo Ma,Ke Wang,Huijie Zhang,Zeqi Zhang,Tao Song,Shuyan Wang,Mingzhu Chen,Shiji Li,Qiang Wang,Hao-Li Zhang
The compelling demand for laser protection both for civil and defense use calls for new-generation nonlinear optical materials. Chemical vapor deposition (CVD) techniques provide extra tricks to modulate crystal optical nonlinearity through fractal growth. The synthesized 2D NbSe 2 and its fractal structures exhibit giant, broadband laser attenuation behaviors extending into the near Infrared (NIR) range. Particularly, the optical limiting performance generally correlates with the fractal dimension, where Fractal NbSe 2 demonstrates enhanced third-order optical nonlinearity at a huge nonlinear absorption coefficient of 9.7 × 10 −4 m W −1 and an ultralow starting threshold of 5 mJ cm −2 at 532 nm. Various techniques include femtosecond spectroscopy, Density functional theory (DFT) calculation and Kelvin probe force microscopy disclose the origin of the strong nonlinearity of the 2D NbSe 2 crystals, and suggest the formation of edge states and overall faster carrier dynamics, larger surface contact potential difference NbSe 2 fractals contribute to their even augmented nonlinear responses. Fractal engineering thus opens new avenues to fabricate highly efficient laser protection materials, and the blocking of intense beam (a large attenuation factor over 13.3 dB at 532 nm) while allowing transmission of weak one (a high linear optical transmittance over 80%) fulfills the much desired “smart” defense.
研究领域:
材料科学
·
光学
·
凝聚态物理
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2024
·
IF 10.8
Pengyu Dong,Yue Jiang,Zhengchi Yang,Licheng Liu,Gu Li,Xinyang Wen,Zhen Wang,Xinbo Shi,Guofu Zhou,Jun-Ming Liu,Jinwei Gao
Organic-inorganic metal halide perovskite solar cells (PSCs) are favorable candidates for next-generation solar cells, due to their excellent photovoltaic performance and promising low-cost fabrication process. Particularly, tin oxide (SnO 2 ), with excellent charge mobility and extraction efficiency, is widely used as electron transport layers (ETLs), and the efficiency of the corresponding n-i-p-type perovskites has been certified as high as 26.21% in single-junction devices. The SnO 2 layer serves as the substrate for the growth of perovskite films, determining the crystalline quality and the buried interface of perovskite films. However, due to the different thermal expansion coefficient of SnO 2 and perovskite, the subsequent perovskite annealing process leads to the residual stress at the buried interfaces and lattice distortion in the perovskite films, which seriously affects their optoelectronic performance and stability. To release this interfacial stress, researchers have made some progress by applying different polymers and small molecules to the SnO 2 /perovskite interface as a buffer layer. Among these, two-dimensional (2D) nanosheets with high carrier mobility, a wide bandgap range, and excellent optical absorption properties are promising, especially 2D NbSe 2 nanosheets showing the advantages of solution-processability, high intrinsic conductivity and clean smooth surface, namely without dangling bonded atoms. Herein, 2D NbSe 2 nanosheets have been introduced at the SnO 2 /perovskite interface to release the undesired residual tensile strain in perovskite films and to form a more matched interfacial energy level alignment. As a result, we have obtained a high-quality perovskite film and further an improved photovoltaic performance. The PCE has been increased from 21.81% to 24.05%. The unencapsulated cell maintained 91% of the initial efficiency after aging over 1000 h under atmospheric condition.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
Nature Communications
·
2016
·Vol. 7
·期 1
·1-8
·
IF 11.329
Zhu Xiaojiao,Guo Yuqiao,Cheng Hao,Dai Jun,An Xingda,Zhao Jiyin,Tian Kangzhen,Wei Shiqiang,Cheng Zeng Xiao,Wu Changzheng,Xie Yi
Ferromagnetism is usually deemed incompatible with superconductivity. Consequently, the coexistence of superconductivity and ferromagnetism is usually observed only in elegantly designed multi-ingredient structures in which the two competing electronic states originate from separate structural components. Here we report the use of surface molecular adsorption to induce ferromagnetism in two-dimensional superconducting NbSe 2 , representing the freestanding case of the coexistence of superconductivity and ferromagnetism in one two-dimensional nanomaterial. Surface-structural modulation of the ultrathin superconducting NbSe 2 by polar reductive hydrazine molecules triggers a slight elongation of the covalent Nb–Se bond, which weakens the covalent interaction and enhances the ionicity of the tetravalent Nb with unpaired electrons, yielding ferromagnetic ordering. The induced ferromagnetic momentum couples with conduction electrons generating unique correlated effects of intrinsic negative magnetoresistance and the Kondo effect. We anticipate that the surface molecular adsorption will be a powerful tool to regulate spin ordering in the two-dimensional paradigm.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yong Li,Jianyun Cao,Guoliang Chen,Lijun He,Xincheng Du,Jiyang Xie,Yaming Wang,Wanbiao Hu
Thin, flexible, and electrically conductive films are in demand for electromagnetic interference (EMI) shielding. Two-dimensional NbSe2 monolayers have an electrical conductivity comparable to those of metals (106–107 S m–1) but are challenging for high-quality and scalable production. Here, we show that electrochemical exfoliation of flake NbSe2 powder produces monolayers on a large scale (tens of grams), at a high yield (>75%, monolayer), and with a large average lateral size (>20 μm). The as-exfoliated NbSe2 monolayer flakes are easily dispersed in diverse organic solvents and solution-processed into various macroscopic structures (e.g., free-standing films, coatings, patterns, etc.). Thermal annealing of the free-standing NbSe2 films reduces the interlayer distance of restacked NbSe2 from 1.18 to 0.65 nm and consequently enhances the electrical conductivity to 1.16 × 106 S m–1, which is superior to those of MXenes and reduced graphene oxide. The optimized NbSe2 film shows an EMI shielding effectiveness (SE) of 65 dB at a thickness of 5 μm (>110 dB for a 48-μm-thick film), among the highest in materials of similar thicknesses. Moreover, a laminate of two layers of the NbSe2 film (2 μm thick) with an insulating interlayer shows a high SE of 85 dB, surpassing that of the 20-μm-thick NbSe2 film (83 dB). A two-layer theoretical model is proposed, and it agrees with the experimental EMI SE of the laminated NbSe2 films. The ability to produce NbSe2 monolayers on a tens of grams scale will enable their diverse applications beyond EMI shielding.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 19
·3134-3142
·
IF 5.047
Can Wu,Jing Liu,Bin Liu,Suyun He,Guoru Dai,Bo Xu,Wenying Zhong
The design of light-responsive peptide hydrogels with controllable drug release characteristics is still a challenge. Here, we fabricated a NIR light-responsive short peptide hydrogel by using a thermo-responsive short peptide hydrogel and PEGylated NbSe2 nanosheets, namely, the NbSe2–PEG@YD hydrogel. Under NIR light irradiation, the hydrogel began to collapse owing to the local heating, leading to the release of the cargos. The hydrogel exhibited recoverability and the release rate of the cargos could be accurately modulated by the NIR light irradiation according to the requirement. The excellent biocompatibility of this hydrogel ensured that it could be further developed as a drug carrier for clinical application.
研究领域:
生物材料
·
药剂学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zhaohua Jiang,Shiyuan Fan,Huiting Xu,Huibin Liu,Sai Dong,Jing Li,Xiaoteng Yan,Zhijie Cui,Wenchao Peng,Wen Liu,Jiapeng Liu
Aqueous copper-selenium (Cu-Se) battery based on conversion mechanism have garnered interest due to their intrinsic safety features and high specific capacity. However, the slow conversion kinetics presents a challenge for its development. Herein, catalytic host material of NbSe 2 @few-layered Nb 2 C (NbSe 2 @f-Nb 2 C) heterostructure with built-in electric field (BIEF) is prepared by in situ selenization strategy for aqueous Cu-Se battery. Benefiting from the high electrical conductivity of f-Nb 2 C MXene, the high electrocatalytic performance of NbSe 2 and the spontaneous BIEF between NbSe 2 and f-Nb 2 C MXene, the Se redox reactions kinetics is enhanced and the reaction barrier is reduced. Consequently, the specific capacity of Se/NbSe 2 @f-Nb 2 C cathode can reach 1128 mAh g −1 at 0.25 A g −1 with stable cycling performance. Additionally, the conversion mechanism is investigated via comprehensive characterizations and density functional theory calculations. This study provides an innovative approach for designing high performance MXene-based catalytic host materials to enhance the conversion kinetics of aqueous Cu-Se batteries.
研究领域:
储能
·
材料科学
·
电化学
·
纳米技术
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2026
·
IF 3.9
Haoliang Yu,Haipeng Wang,Shuzheng Wang,Xiaohong Hu
Rechargeable magnesium-lithium hybrid batteries (MLHBs) are promising for energy storage applications due to their high volumetric energy density, enhanced safety, and reliable performance. However, the advancement of MLHBs has been impeded by the low median discharge voltage and insufficient cycle life of cathode materials. In this work, NbSe 2 pre-intercalated with PY 14 + ions is employed as the cathode for MLHBs, delivering a median discharge voltage as high as 1.30 V. The intercalation of PY 14 + effectively expands the interlayer spacing of the material, which provides wider diffusion channels for ion transport and reduces the migration barrier. This structural modification significantly enhances the rate capability of the material, enabling a reversible capacity of 58.71 mAh g -1 even at a high current density of 2000 mA g -1 . Simultaneously, PY 14 + ions act as structural pillars, mitigating the collapse of the layered structure during cycling and thereby improving the cycling stability, with a capacity retention of 61.65% after 1000 cycles at 500 mA g -1 . Kinetic analyses and ex situ characterization confirm an increased contribution from the diffusion-controlled process and a highly reversible conversion reaction mechanism in the PY 14 + -intercalated NbSe 2 cathode. This study provides valuable insights for developing high-performance cathodes for MLHBs.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 46
·12638-12642
·
IF 5.976
Yihuan Shi,Hui Long,Shunxiang Liu,Yuen Hong Tsang,Qiao Wen
Ultrasmall NbSe2 quantum dots (QDs) with an average diameter of 2.68 nm were successfully fabricated and investigated. By employing the NbSe2 quantum dots (QDs) as a saturable absorber, highly stable ultrafast laser pulse trains with a duration of 765 fs or 380 ps were successfully generated from mode-locking erbium or ytterbium-doped fiber laser systems by using the fabricated NbSe2 QDs. The obtained laser pump power threshold for the mode-locking operation of the Er-doped fiber laser was 15 mW, which is the lowest value recorded among 2D materials based saturable absorbers. Our results give a promising contribution to the research field by demonstrating the strong nonlinear optical properties of these novel ultrasmall NbSe2 QDs. It also opens up new opportunities for the use of these novel materials for nonlinear optics and ultrafast laser photonic technologies.
研究领域:
材料科学
·
光学工程
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 9
·6015-6024
·
IF 3.9
Li Zhi-Yue,Li Long-Xiang,Xie Yi-Qin,Sun Hui,Lu Si-Rong,Bao Chun-Hao,Zhang Han,Chen Ting-Yong
Two-dimensional materials are attractive in electronics, energy and optics due to their fascinating physical properties. Appropriate fabrication methods and optimized process parameters are critical for improving crystal quality and achieving precise control over the structure and properties of these materials. Here, 2H-NbSe 2 single crystals were synthesized via a chemical vapor transport (CVT) process using iodine as the transport agent in a dual-zone tube furnace. The structural, chemical compositions, electrical, and magneto-transport properties of the synthesized crystals were comprehensively investigated. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed that the crystals were well-crystallized in a single-phase hexagonal lattice configuration, consistent with the typical van der Waals layered characteristics. The Raman spectra displayed characteristic peaks for NbSe 2 . The atomic ratio of Nb: Se in the crystals was approximately 1:2. The residual resistivity ratio ( RRR ) value (18), transition temperature ( T C ≈ 7 K) and transition width (Δ T ) of 0.26 K obtained from temperature-dependent resistance measurements indicate good crystal quality. Magneto-transport measurements revealed a distinct anisotropy between in-plane and out-of-plane magnetic field directions, resulting in typically different upper critical fields ( H c 2 ). This work presents a straightforward and effective iodine-assisted CVT method for growing high-quality NbSe₂ crystals, offering fundamental and technological significance for the growth and application of two-dimensional materials.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Wang Xiaohan,Wang Hao,Ma Liang,Zhang Labao,Yang Zhuolin,Dong Daxing,Chen Xi,Li Haochen,Guan Yanqiu,Zhang Biao,Chen Qi,Shi Lili,Li Hui,Qin Zhi,Tu Xuecou,Zhang Lijian,Jia Xiaoqing,Chen Jian,Kang Lin,Wu Peiheng
Superconducting nanocircuits, which are usually fabricated from superconductor films, are the core of superconducting electronic devices. While emerging transition-metal dichalcogenide superconductors (TMDSCs) with exotic properties show promise for exploiting new superconducting mechanisms and applications, their environmental instability leads to a substantial challenge for the nondestructive preparation of TMDSC nanocircuits. Here, we report a universal strategy to fabricate TMDSC nanopatterns via a topotactic conversion method using prepatterned metals as precursors. Typically, robust NbSe 2 meandering nanowires can be controllably manufactured on a wafer scale, by which a superconducting nanowire circuit is principally demonstrated toward potential single photon detection. Moreover, versatile superconducting nanocircuits, e.g ., periodical circle/triangle hole arrays and spiral nanowires, can be prepared with selected TMD materials (NbS 2 , TiSe 2 , or MoTe 2 ). This work provides a generic approach for fabricating nondestructive TMDSC nanocircuits with precise control, which paves the way for the application of TMDSCs in future electronics.
研究领域:
材料科学
·
纳米技术
·
超导性
·
光子学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 37
·9545-9551
·
IF 5.256
Jian-Min Li,Jie Fang
An anthracene vapor-assisted inverse transport growth mechanism of unsupported ultrathin two-dimensional (2D) superconducting single-crystal niobium (Nb) and niobium diselenide (NbSe2) nanoplates (thickness ∼2.5 nm) using anthracene and NbSe2 powders as precursors is reported. Besides the whisker-like counterparts, the anthracene vapor hierarchical invasion into NbSe2 leads to 2D Nb nanoplates with a {110} surface and 2D few-layered {0001} NbSe2 nanoplates grown in the high-temperature residual region, while sub-millimeter selenium whiskers are found in the low-temperature transporting region. Direct magnetization measurements demonstrated that superconductivity at ∼3.3 K was clearly observed in the unsupported ultrathin Nb and NbSe2 nanoplates. These findings may offer a new way to produce freestanding single-crystal 2D superconductors and elemental 2D metallic nanoplates.
研究领域:
材料科学
·
凝聚态物理
·
纳米技术
·
超导物理
·
二维材料
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yaqi Hu,Yanchen Liu,Yang Lu,Zongliang Zhang,Siliang Liu,Fangbo He,Yang Liu,Yongle Chen,Fangyang Liu
All-solid-state lithium metal batteries (ASSLBs) offer an alternative route to safe and high energy density power sources. Sulfur-based cathodes with high theoretical specific capacity and low cost are crucial for advancing ASSLBs. However, the electronic insulation and sluggish kinetics of sulfide materials like Li 2 S severely limit battery performance. Herein, the strategy is proposed that a highly electronic conductive Li 2 S-NbSe 2 material enhances the electrochemical performance through bidirectional self-activation. The chemical interaction between Li 2 S and NbSe 2 induces NbSe 2-x S x and Li 2 Se derivatization, serving as the basis for activation. The carrier transport properties, chemical evolution and self-activation mechanism of Li 2 S-NbSe 2 during the oxidation–reduction process are revealed. The chemical activation of NbSe 2-x S x is explored to accelerate the electrochemical processes by modifying the conductivity of sulfur species and the conversion pathways without insulating Li 2 S and S aggregation. Therefore, ASSLBs using Li 2 S-NbSe 2 as cathode active material achieve an electrode-level energy density of 394 Wh kg −1 and a power density of 524 W kg −1 at 1 C (4.35 mA cm −2 ) and 25 °C. The capacity retention after 100 cycles at 0.5 C is ≈99.3% with almost no degradation. This work provides new options and insights for the rational design and development of chalcogenide cathode active materials for high-performance ASSLBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）