Nature Nanotechnology
·
2021
·Vol. 16
·期 11
·1201-1207
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IF 39.213
Li Taotao,Guo Wei,Ma Liang,Li Weisheng,Yu Zhihao,Han Zhen,Gao Si,Liu Lei,Fan Dongxu,Wang Zixuan,Yang Yang,Lin Weiyi,Luo Zhongzhong,Chen Xiaoqing,Dai Ningxuan,Tu Xuecou,Pan Danfeng,Yao Yagang,Wang Peng,Nie Yuefeng,Wang Jinlan,Shi Yi,Wang Xinran
Two-dimensional (2D) semiconductors, in particular transition metal dichalcogenides (TMDCs), have attracted great interest in extending Moore’s law beyond silicon 1 , 2 , 3 . However, despite extensive efforts 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , the growth of wafer-scale TMDC single crystals on scalable and industry-compatible substrates has not been well demonstrated. Here we demonstrate the epitaxial growth of 2 inch (~50 mm) monolayer molybdenum disulfide (MoS 2 ) single crystals on a C-plane sapphire. We designed the miscut orientation towards the A axis (C/A) of sapphire, which is perpendicular to the standard substrates. Although the change of miscut orientation does not affect the epitaxial relationship, the resulting step edges break the degeneracy of nucleation energy for the antiparallel MoS 2 domains and lead to more than a 99% unidirectional alignment. A set of microscopies, spectroscopies and electrical measurements consistently showed that the MoS 2 is single crystalline and has an excellent wafer-scale uniformity. We fabricated field-effect transistors and obtained a mobility of 102.6 cm 2 V −1 s −1 and a saturation current of 450 μA μm –1 , which are among the highest for monolayer MoS 2 . A statistical analysis of 160 field-effect transistors over a centimetre scale showed a >94% device yield and a 15% variation in mobility. We further demonstrated the single-crystalline MoSe 2 on C/A sapphire. Our method offers a general and scalable route to produce TMDC single crystals towards future electronics.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 11
·1-10
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IF 5.3
Wang Qian,Hu Rongjing,Zhao Huifang,He Xiaojing,Zhang Ruiping,Dong Yongqiang
Coin-metal@semiconductor nanohybrids have attracted extensive attention in surface-enhanced Raman scattering (SERS) detection, aiming to achieve the synergistic effect of electromagnetic enhancement mechanism (EM) and chemical enhancement mechanism (CM). In this work, positively charged thin-layered molybdenum disulfide nanosheets (MoS 2 NSs) and negatively charged gold nanoparticles (AuNPs) were synthesized, which were further fabricated into MoS 2 NSs@AuNPs via electrostatic interactions and Au–S bonding. The approach is quite rapid, cost-effective, and environmentally friendly, and the resulting MoS 2 NSs@AuNPs exhibited an outstanding SERS enhancement factor of up to 2.33 × 10 8 for crystal violet due to the synergistic effect of EM and CM. Furthermore, the fabricated SERS substrate demonstrated long-term stability, maintaining about 80% of SERS activity even after storage for two months, and excellent reproducibility, with a relative standard deviation of 5.20%. Remarkably, this SERS-active nanohybrid enabled rapid and highly sensitive detection of thiram residues in apple juice, achieving satisfactory recoveries of 82.6–110.7% and an impressively low limit of quantification of 50 µg/L. This work not only presents a novel strategy for designing high-performance SERS nanomaterials but also highlights their promising applications in food safety monitoring and environmental analysis. Graphical
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2016
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IF 1.904
Song Hao,Bingchu Yang,Yongli Gao
Monolayer MoS 2 is an emerging two-dimensional semiconductor with wide-ranging potential applications in novel electronic and optoelectronic devices. Here, we reported controlled vapor phase growth of hybrid spiral-like MoS 2 crystals investigated by multiple means of X-Ray photoemission spectroscopy, scanning electron microscopy, atomic force microscopy , kelvin probe force microscopy, Raman and Photoluminescence techniques. Morphological characterizations reveal an intriguing hybrid spiral-like MoS 2 feature whose lower planes are AB Bernal stacking and upper structure is spiral. We ascribe the hybrid spiral-like structure to a screw dislocation drive growth mechanism owing to lower supersaturation and layer-by-layer growth mode. In addition, the electrostatic properties of MoS 2 microflakes with hybrid spiral structures are obvious inhomogeneous and dependent on morphology manifested by kelvin probe force microscopy. Our work deepens the understanding of growth mechanisms of CVD-grown MoS 2 , which is also adoptable to other TMDC materials.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing Yang,Shun-Feng Jiang,Wei-Fei Hu,Hong Jiang
The efficient elimination of biotoxicity of halogenated antibiotics by electrochemical dehalogenation pretreatment is required by a subsequent biochemical treatment process. Molybdenum disulfide (MoS 2 ) has been applied as an efficient catalyst for the hydrogen evolution and water splitting, without any investigation in electrochemical dehalogenation, particularly under complex environmental conditions. In this study, ultrathin MoS 2 nanosheets are fabricated via a simple one-step hydrothermal process, and proved as a promising catalyst for enhancing electrochemical dehalogenation of halogenated antibiotics of a chlorinated antibiotic florfenicol (FLO) under relevant environmental conditions. Results showed that the reaction rate constant of the ultrathin MoS 2 electrode (0.0135 min −1 ) was 4.1- and 28- fold higher than those of commercial MoS 2 and bare carbon paper, respectively, and the biotoxicity of treated effluent could almost be neglected. Free radical scavenging experiments and electrochemical performance test suggested that the dechlorination of FLO on ultrathin MoS 2 electrode was synergistically accomplished via the direct electron transfer and indirect reduction of active H*. Environmental conditions, namely, dissolved oxygen and humic acid had only a slight effect on the dechlorination efficiency. Electrochemical dechlorination of FLO was a gradual dechlorination process and FLO-2Cl (representing the removal of two chlorine atoms from FLO) was the final main product. Besides, the ultrathin MoS 2 electrode retained a good stability and the energy consumption of the ultrathin MoS 2 cathode at −1.2 V was 0.02643 kWh g −1 , more than those of commercial MoS 2 cathode and bare carbon paper. This study develops a new application of noble-metal-free electrode material for electrochemical dechlorination in wastewater.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 11
·765
·
IF 1.784
Xiao Xuling,Li Jun,Wu Jie,Lu Donglin,Tang Chao
In this paper, the negative photoconductivity (NPC) was observed in molybdenum disulfide (MoS 2 ) prepared by chemical vapor deposition. The conductivity drops by 15% in stable light excitation. We speculate that the generation of NPC is due to the electronic transition to the defect state level, which reduces the rate of movement of non-equilibrium carrier. In the low-defect system, free excitons predominate, and the material exhibits positive photoconductivity. It is beneficial to the research on a new single-wavelength photodetector based on NPC.
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Applied Materials Today
·
2020
·
IF 8.352
Yipeng Chen,Baokang Dang,Qingfeng Sun
The concept of replicating the laminated ternary structure of natural nacre with coordinating strength and toughness has generated much interest in exploring future structural materials. Here the ternary lignocellulosic nacre with high performance is fabricated via synergistic toughening of delignified nano-lignocellulose (DNLC) and molybdenum disulfide (MoS 2 ) through freezing-induced assembly followed by hot-pressing process. The high mechanical performance of the lignocellulosic nacre due to lubrication of MoS 2 combine with intermolecular hydrogen bonding between DNLC and chitosan (CS) has effectively verified the synergistic toughening effect. The MoS 2 -CS lignocellulosic nacre exhibits an exceptional balance of strength and toughness, which exceed to other conventional lignocellulosic composites and natural materials. Furthermore, these composites show superior photocatalytic activity. This approach of fabricating the MoS 2 -CS lignocellulosic nacre supplies an imaginative door in the near future for devising and manufacturing the ultra-strong and ultra-tough lignocellulosic nacre for the photooxidation of volatile organic.
研究领域:
材料科学
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纳米复合材料
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仿生工程
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环境催化
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绿色建筑材料
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MICROCHIMICA ACTA
·
2022
·Vol. 190
·期 1
·1-12
·
IF 6.408
Zhong Yaping,Guo Lijuan,Lu Zhentan,Wang Dong
A simple method is reported for hypochlorite determination based on fluorescence 3-aminophenylboronic acid–functionalized molybdenum disulfide quantum dots (B-MoS 2 QDs). B-MoS 2 QDs with strong fluorescence at 380 nm have been successfully synthesized by the amidation reaction between APBA and hydrothermal MoS 2 QDs. Hypochlorite sensing was proposed utilizing the fluorescent quenching effect of 3,3ʹ,5,5ʹ-tetramethylbenzidine dihydrochloride (TMB) on B-MoS 2 QDs and the fast redox reaction between hypochlorite and TMB. The fluorescent quenching effect of TMB to B-MoS 2 QDs was proved to be caused by static dynamic quenching and inner filter effect. A good linear relationship was obtained in the hypochlorite concentration range from 1 to 20 μM, and the limit of detection (LOD) was 36.8 nM. The proposed fluorescent detection assay was simple and fast, taking only 5 min at room temperature. Satisfactory results were obtained in the standard spike recovery tests on tap water and milk samples, which indicate high potential in constructing fluorescent bio-detection assays. Graphical Abstract
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LANGMUIR
·
2023
·
IF 3.9
Keli Wang,Xuan Zhou,Jian Liu,Xiaobo Wang,Xia Zhang
Ambient environment has a crucial effect on the lubrication performance of molybdenum disulfide (MoS2) coatings. In this work, we fabricated porous MoS2 coatings via a facile optimized aerosol-assisted chemical vapor deposition (AACVD) method. It is found that the obtained MoS2 coating demonstrates outstanding antifriction and antiwear lubrication performance with the coefficient of friction (COF) and wear rate as low as 0.035 and 3.4 × 10–7 mm3/Nm in lower humidity (15 ± 5)%, respectively, which is comparable to the lubrication ability of pure MoS2 in vacuum. In addition, the hydrophobic property of porous MoS2 coatings is suitable for infusing lubrication oil to achieve stable solid–liquid lubrication in higher humidity (85 ± 2)%. The composite lubrication system shows excellent tribological behavior in both dry and wet environments, which will alleviate the sensitivity of the MoS2 coating to the environment and ensure the service life of the engineering steel in complex industrial backgrounds.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qiang Luo,Jinyang Li,Wei Wang,Yunhong Li,Yilan Li,Xiaobing Huo,Jianbao Li,Ning Wang
Nature has evolved diverse strategies to battle surface biofouling colonization and thus provides us novel insights into designing and developing advanced nontoxic antibiofouling materials and technologies. Mimicking the defense mechanisms of natural haloperoxidases in marine algae in response to biofilm colonization, here we show that the less active MoS2 shows efficient haloperoxidase-mimicking activity through judicious transition metal engineering. Cobalt-doped MoS2 (Co–MoS2) displays an excellent haloperoxidase-mimicking performance in catalyzing the Br– oxidation into germicidal HOBr, roughly 2 and 23 times higher than the nickel-doped MoS2 and pristine MoS2, respectively. Accordingly, Co–MoS2 shows an outstanding antimicrobial effect against drug-resistant bacteria and antibiofouling performance in real field tests in marine environments. The realization of robust haloperoxidase-mimicking activity of MoS2via metal engineering may open a new avenue to design highly active transition metal dichalcogenides for antibacterial and antibiofouling applications.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mingyue Chen,Yuzhu Sun,Hongfei Ji,Man Jiang,Wendong Liu,Mingzheng Shao,Zhe Hao,Hongyan Zhang,Xiyan Li,Yanfeng Dang,Ruizhong Zhang,Libing Zhang
Developing high-efficiency near-infrared (NIR) electrochemiluminescence (ECL) active transition metal dichalcogenides quantum dots (TMDs QDs) for spectroscopic multiplex analysis and biological imaging poses a significant challenge in versatile bioanalysis. In this work, we report a facile one-step hydrothermal method for the synthesis of defect-rich molybdenum disulfide quantum dots (MoS 2 QDs). Because of the defect effect on the nanocrystalline surface, the MoS 2 QDs exhibit enhanced fluorescence (quantum yield is 7.7%) in comparison with those from top-down physical approaches. Moreover, the defect-rich MoS 2 QDs exhibit remarkable ECL performance using K 2 S 2 O 8 as a coreactant, with a maximum emission at ∼810 nm. The ECL mechanisms of potential-dependent emission from MoS 2 QDs were elucidated based on electrochemistry, photoluminescence, and spooling ECL spectroscopy. Leveraging the good biocompatibility and defect-induced ECL enhancement of MoS 2 QDs, a sandwich ECL immunosensor was developed for carcinoembryonic antigen (CEA) detection. Without any signal amplification techniques, the proposed biosensor demonstrated a detection limit of 0.005 ng/mL CEA with a linear range from 0.005 ng/mL to 400 ng/mL, and a good selectivity and potential for real human serum analysis. The defect engineering of MoS 2 QDs in this study provides guidance for regulating their optical properties and exploring new bioanalysis applications.
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ACS Omega
·
2019
·
IF 2.584
Jing Gao,Miyu Zhang,Jingtao Wang,Guanhua Liu,Hengrao Liu,Yanjun Jiang
Inorganic nanofiltration membranes with high flux are urgently needed in water purification processes. Herein, polydopamine (PDA)-modified layer-stacked molybdenum disulfide (MoS2) nanofiltration membranes (NFMs) were fabricated via a pressure-assisted self-assembly process. The separation performance of the as-prepared membranes with various MoS2 loadings at different dopamine polymerization times was evaluated. The pure water permeance of PDA-modified MoS2 NFMs, with MoS2 loading of 0.1103 mg/cm2 at 4 h modification, could reach 135.3 LMH/bar. The rejection toward methylene blue could reach 100% with molecular weight cutoff approximately 671 Da and a high permeability of salts. Furthermore, the resultant membrane also exhibited a satisfactory long-term stability toward dye solution and antifouling property toward bovine serum albumin. This work may give inspiration to the development of inorganic membranes with high performance, especially high pure water permeance, for water-related processes.
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ANALYTICAL SCIENCES
·
2019
·Vol. 35
·期 5
·551-556
·
IF 1.618
Hongli YANG,Yongxin HUANG,Yanjun ZHAO,Aiping FAN
A simple and sensitive chemiluminescent (CL) sensing platform for mercury(II) ions (Hg2+) in water was developed based on monolayer molybdenum disulfide (MoS2). The layered MoS2 can catalyze the oxidation of luminol by H2O2, producing an enhanced CL signal because of the peroxidase-like activity of the layered MoS2. In addition, MoS2 has a good adsorption ability to Hg2+ because of the inherent affinity of Hg2+ to sulfur contained in MoS2. Interestingly, the pre-incubation of Hg2+ with layered MoS2 inhibited the catalytic activity of MoS2 on the luminol–H2O2–MoS2 CL reaction, leading to CL quenching. The CL intensity decreased linearly with increasing concentration of Hg2+ from 0.005 – 40 μM. The limit of detection (LOD) was estimated to be 1 nM. The relative standard deviation (RSD) was found to be 3.71%, indicating good reproducibility. The recoveries of Hg2+ spiked in tap water were from 100.0 to 116.0% with RSD from 2.7 to 5.6%, detected by the standard addition method, and demonstrated good applicability.
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