Nanoscale
·
2021
·Vol. 13
·期 10
·5489-5496
·
IF 7.79
Zhiwei Wang,Xiang Wang,Qian Chen,Xiaoshan Wang,Xiao Huang,Wei Huang
The spatial arrangement of heterostructures based on two-dimensional layered materials is important in controlling their electronic and optoelectronic properties. In this contribution, by controlling the reaction kinetics and thus the nucleation and growth sequence of p-type SnS and metallic NbS2, controllable preparation of both SnS@NbS2 core@shell and SnS/NbS2 lateral heterostructures was realized. The SnS@NbS2 core@shell heterostructures were further applied in photodetectors, and interestingly, a negative photoresponse was observed due to the Seebeck effect exerted on the NbS2 shell. Compared with the pure metallic NbS2, the SnS@NbS2 core@shell heterostructures showed a 15 times increased signal-to-noise ratio and much improved photocurrent stability, largely due to the charge and heat transfer between the SnS core and NbS2 shell.
研究领域:
材料科学
·
光电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Li Wenhui,Wei Xijun,Dong Hongmei,Ou Yingqing,Xiao Shenghuan,Yang Yang,Xiao Peng,Zhang Yunhuai
Layered NbS2, a member of group-V transition metal dichalcogenides, was synthesized via a colloidal synthesis method and employed as a negative material for a supercapacitor. The morphologies of NbS2 can be tuned from ultrathin nanosheets to hierarchical structures through dynamics controls based on growth mechanisms. Electrochemical energy storage measurements present that the ultrathin NbS2 electrode exhibits the highest rate capability due to having the largest electrochemical surface area and its efficient ion diffusion. Meanwhile, the hierarchical NbS2 shows the highest specific capacitance at low current densities for small charge transfer resistance, displays 221.4 F g−1 at 1 A g−1 and 117.1 F g−1 at 10 A g−1, and cycling stability with 78.9% of the initial specific capacitance after 10,000 cycles. The aggregate or stacking of nanosheets can be suppressed effectively by constructing hierarchical structure NbS2 nanosheets.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Dongqian Xu,Xiaojun He,Enoch Obeng,Zhangyan Ye,Jianliang Shen,Xi Ding
Antibiotic resistance and bacteria-related infections pose a threat to lives around the globe, which calls for urgent development of advanced therapy to curb this menace. Although photothermal therapy (PTT) is promising, most photothermal agents lack good photothermal conversion performance which restrains their application. Transition metal dichalcogenides (TMDs) nanosheets can exhibit many advantages in antibacterial applications due to their unique two-dimensional structure with larger specific surface area and higher near-infrared (NIR) absorption. Here, we prepared two-dimensional NbS 2 nanosheets (NbS 2 NSs) with good biological stability and high biocompatibility through a high-temperature reduction reaction. NbS 2 NSs exhibited excellent and stable photothermal properties, which were capable of killing Pseudomonas aeruginosa ( P. aeruginosa ) and Staphylococcus aureus ( S. aureus ) under 5 min of 808 nm laser irradiation. In addition, the morphological characterization of bacteria showed bacterial cell membrane destruction. Furthermore, NbS 2 NSs under NIR irradiation inhibited the formation of biofilms and quickly eradicated S. aureus from an infected wound to promote wound healing through a hyperthermia effect. Overall, this work provides an attractive strategy for synthesizing and applying two-dimensional NbS 2 NSs with significant implications for bacterial eradication and future biomedical applications.
研究领域:
医学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 6
·2108194
·
IF 18.808
Huibin Zhang,Junye Cheng,Honghan Wang,Zehao Huang,Qingbin Zheng,Guangping Zheng,Deqing Zhang,Renchao Che,Maosheng Cao
VB-Group transition metal disulfides (TMDs) are considered excellent materials for electromagnetic wave (EMW) absorption because of their good conductivity and abundant active sites located at their edges and substrates, as compared with VIB-Group TMDs. Herein, for the first time, EMW absorbers based on VB-Group NbS 2 nanosheets by using a facile one-step solvothermal method are successfully prepared. The minimum reflection loss (RL min ) can reach up to 43.85 dB with an effective absorption bandwidth of 6.48 GHz (11.52–18.00 GHz). The remarkable EMW absorption performance can also be reflected in the tunable frequency bands (C-, X-, and Ku-bands), which is achieved by adjusting the contents of materials. Furthermore, the influence of the content of 2H-phase and 1T-phase in NbS 2 on the EMW absorption performance is systematically investigated. The hierarchical hollow-sphere structure of NbS 2 promotes dielectric loss and the multiple reflection and absorption of EMW, and enhances the impedance matching and synergistic attenuation ability. This work demonstrates that the bottleneck of effective absorbing frequency band of single-component dielectric EMW absorbing materials could be broken through, and paves a novel path towards developing broadband absorbing materials in EMW absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jiacheng Cao,Qian Chen,Zeyi Wang,Xiaoshan Wang,Zhiwei Wang,Jusheng Bao,Xiao Huang
Apart from their outstanding photoelectronic properties, metal halide perovskites have demonstrated reversible stimuli-responsibility toward a variety of different environmental stimulus. Herein, we used a hot-injection method to deposit lead free perovskite Cs 3 Cu 2 Cl 5 on layered metal chalcogenide NbS 2 . The Cs 3 Cu 2 Cl 5 /NbS 2 heterostructures and the pure Cs 3 Cu 2 Cl 5 crystals were fabricated into humidity sensors based on impedance change. The heterostructures exhibited an ultra-high humidity sensing response of up to 10 4 when the relative humidity (RH) was changed from 11% to 97%, which was at least one order of magnitude higher than that of the pure Cs 3 Cu 2 Cl 5 crystals. The enhanced performance of the heterostructures was attributed to the improved film continuity and hydrophilicity , which respectively led to the improved charge/ion conduction and increased water adsorption. In addition, the Cs 3 Cu 2 Cl 5 /NbS 2 heterojunction is ohmic-like, enabling effective charge/ion transfer across the interface. Given the high RH response of the heterostructures, a contactless sensing device was fabricated, targeting for the vapor emitted from a fingertip. Our work demonstrates that heterostructures between metallic 2D materials and metal halide perovskites are promising sensing materials.
研究领域:
材料科学
·
纳米技术
·
传感器
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2023
·Vol. 5
·期 3
·830-839
·
IF 4.7
Yazhou Huang,Yunfei Zhang,Junyan Lv,Yinfeng Shao,Dongfang Yang,Yuan Cong
The sensitive detection of cardiac troponin I (cTnI) is of great significance for the early diagnosis of acute myocardial infarction (AMI). Herein, in order to fabricate an electrochemical biosensor for ultrasensitive cTnI detection, atomic layer deposition (ALD) was employed to directly deposit NbS2 nanoflakes (NFs) on carbon fiber paper (CFP). Due to the self-limiting reaction of ALD, NbS2NFs were deposited uniformly and accurately on the surface of carbon fibers by controlling the number of ALD cycles, which ensured ultrasensitive detection. Precise regulation of the nanoscale morphology and electrochemical performance of NbS2 nanoflakes via ALD cycles was observed in depth. Owing to the high surface area and conductivity, an anodic/cathodic current of ∼3.01 mA of NbS2NFs/CFP can be obtained. Subsequently, an electrochemical biosensor based on the excellent performance of NbS2NFs/CFP was fabricated. The ultrasensitive detection of cTnI in a linear range of 1 fM to 0.1 nM with a detection limit of 0.32 fM was achieved.
研究领域:
材料科学
·
生物化学
·
电化学
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wei Shen,Liang Qiao,Juan Ding,Yongming Sui
Promoting the intrinsic activity and accessibility of basal plane sites in transition metal dichalcogenides (TMDs) is an important way to optimize their catalytic performance for energy conversion and storage. Here, a simple liquid-phase phosphating selenization pyrolysis method is developed to prepare P and Se co-doped niobium disulfide (NbS 2 ) 3D nanosheets with active basal plane for efficient catalyzing hydrogen evolution reaction (HER). Experimental results indicate that the P and Se co-doped NbS 2 3D nanosheets exhibit significantly enhanced HER activity and stability compared to their undoped counterparts. It realizes 165 mV decreased overpotential at 10 mA cm −2 and a stable durability over 40 h continuous operation at 14 mA cm −2 without observable fading. Density functional theory (DFT) studies suggest that the P dopant is to activate the adjacent original inert Nb sites, where both S and Nb sites in P, Se co-doped NbS 2 monolayer can together act as the active sites for HER. Furthermore, the addition of selenium can stabilize the catalytic activity. Our work provides a promising approach and theoretical framework for improving the electrocatalytic HER performance of NbS 2 , and may have general guidelines for other transition metal disulfides.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changsheng Wu,Zhiyong Wang,Xianbo Jin
Niobium (Nb) is primarily used as the active material in Nb electrolytic capacitors in the form of metallic fine powder. Unlike traditional methods of preparing niobium powder through chemical or electrochemical reduction of metal compounds in molten salts, we report here the efficient preparation of Nb nanopowder via electrolysis of NbS 2 in the NaCl-KCl melt at 973 K. The NbS 2 is simply synthesized by carbo-sulfidation of Nb 2 O 5 . The following electro-desulfidation in the molten electrolyte converts solid NbS 2 into Nb nanopowder at the cathode, with S 2- ions moving to the anode and being oxidized to gaseous sulfur. The reduction path was verified to be NbS 2 → L x NbS 2 → NbS 2-w → Nb. Through constant cell electrolysis at 2.9 V, NbS 2 is rapidly reduced to nodular Nb nanopowder (50-100 nm), with a Current efficiency and energy consumption of approximately 94% and 3.58 kW·h kg⁻¹ Nb, respectively.
研究领域:
材料科学
·
电化学
·
纳米技术
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）