ACS Sensors
·
2020
·
IF 7.333
Fei Li,Siyu Wang,Huanshun Yin,Yan Chen,Yunlei Zhou,Jing Huang,Shiyun Ai
5-Formylcytosine (5fC) is a rare base found in mammalian DNA, which is thought to be involved in the demethylation of DNA. As a stable epigenetic modification, 5fC participates in gene regulation and cell differentiation, and plays an important role in the growth and development of plants. However, the abundance of 5fC is only as low as 0.002–0.02% of cytosine. Therefore, to further understand the functions of 5fC, a rapid, highly sensitive, and efficient method is needed for detecting 5fC. Herein, a novel photoelectrochemical (PEC) biosensor was constructed for 5fC detection, where a MoS2/WS2 nanosheet heterojunction was employed as a photoactive material, amino-functionalized Fe3O4 and SMCC were used as a linker, 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole was adopted as 5fC recognition reagent, and black TiO2 (B-TiO2) was used as a signal amplification unit. Under the optimal experimental conditions, this PEC biosensor showed a wide linear range of 0.01–200 nM and a low detection limit of 2.7 pM (S/N = 3). Due to the specific covalent reaction between −NH2 and −CHO, the biosensor presented high detection sensitivity, even discriminating 5fC with 5-methylcytosine and 5-hydroxymethylcytosine. The biosensor was then applied to investigate the effect of heavy metal Cd2+ on 5fC content in the root, stem, and leaves of maize seedlings.
研究领域:
植物学
·
遗传学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Xinxin Jiang,Ye Song,Meiling Dou,Jing Ji,Feng Wang
In this work, we fabricated MoS 2 /WS 2 heterostrucutures with decoration of Bi 2 S 3 nanorods through different stacking sequences (MoS 2 /WS 2 (bottom layer) +Bi 2 S 3 (top layer) and Bi 2 S 3 (bottom layer) + MoS 2 /WS 2 (top layer), respectively). The morphology and structure were studied by scanning electron microscope (SEM), transmission electron microscope (TEM) and the X-ray powder diffraction (XRD). It was found that the hybrid structure with different stacking sequences was composed of Bi 2 S 3 nanorods and MoS 2 /WS 2 nanosheets. By UV–visible absorption spectra (UV–vis) and photoluminescence (PL) experiments, we found that the composite catalysts of both stacking sequences can promote visible-light utilization and accelerate the electron transportation. Electrochemical measurements (such as cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscope (EIS) under light illumination or in dark) indicated that the MoS 2 /WS 2 +Bi 2 S 3 possessed higher photoelectrocatalytic activity towards hydrogen evolution reaction (HER) than that of Bi 2 S 3 +MoS 2 /WS 2 due to its proper energy band alignment that facilitates the effective carrier separation, the lower charge transfer resistance , higher electrochemically active surface area as well as the fast electron transfer kinetics. Inspired by these observations, we believe that MoS 2 /WS 2 +Bi 2 S 3 catalyst is a potential candidate for photoelectrocatalytic production of H 2 .
研究领域:
材料科学
·
纳米技术
·
电化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hexuan Li,Dongdong Li,Yilin Li,Haoran Liu,Junzhi Li,Wei Han
The reaction kinetics of lithium-sulfur (Li-S) battery mainly depends on the capture and catalytic conversion efficiency of lithium polysulfide (LiPSs). The unique electron configuration of the 5d metal and the high electrical conductivity of MXene can enhance the interaction between the catalyst and LiPSs. However, the challenge of enhancing the adsorption of LiPSs by regulating the electronic structure of the catalyst with 5d metal and MXene remains unresolved and obscure. In this work, we have developed molybdenum disulfide (MoS 2 )-tungsten disulfide (WS 2 ) @MXene (MoS 2 -WS 2 @MX) heterostructure catalysts for separator coatings in Li-S batteries by introducing W and MXene for the first time. Theoretical calculations demonstrate that the 5 d metallic and conductive MXene coupling effectively modulate the orbital hybridization degree between the catalyst and LiPSs, thereby reducing the energy barrier for LiPSs conversion. Electrochemical test and in situ tests verify the effectiveness of the strategy on the adsorption and conversion of LiPSs. Consequently, the MoS 2 -WS 2 @MX based batteries exhibit high initial reversible capacity of 950.3 mAh g −1 and low capacity decay of 0.066 % per cycle over 500 cycles at 2 C, which is superior to most reported catalysts. This study provides a dual regulatory strategy for enhancing catalytic activity, offering valuable insights for the advancement of high-performance Li-S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 12
·1835
·
IF 5.3
Min Zhang,Jinzhu Zhang
In this paper, the heterostructure of MoS2/WS2was prepared by a hydrothermal method; the n-n heterostructure was demonstrated using TEM combined with Mott-Schottky analysis. The valence and conduction band positions were further identified by the XPS valence band spectra. The NH3-sensing properties were assessed at room temperature by changing the mass ratio of the MoS2and WS2components. The 50 wt%-MoS2/WS2sample exhibited the best performance, with a peak response of 23643% to NH3at a concentration of 500 ppm, a minimum detection limit of 20 ppm, and a fast recovery time of 2.6 s. Furthermore, the composites-based sensors demonstrated an excellent humidity immune property with less than one order of magnitude in the humidity range of 11–95% RH, revealing the practical application value of these sensors. These results suggest that the MoS2/WS2heterojunction is an intriguing candidate for fabricating NH3sensors.Keywords:MoS2/WS2;anti-humidity;ammonia sensing properties;heterojunction
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiapeng Liu,Huibin Liu,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Monolayer MoS 2 (WS 2 ) nanosheets have triggered tremendous interest due to their fascinating unique properties, but high-yield production of single-layer MoS 2 (WS 2 ) still remains an enormous challenge and of great interest. Herein, we report a facile efficient partial etching strategy to tailor thickness and lateral size of MoS 2 (WS 2 ) so as to increase the fraction of edges, which remarkably enhanced the yield of monolayer MoS 2 (20%) and WS 2 (12%) nanosheets by liquid phase exfoliation. As a proof of concept, the exfoliated monolayer MoS 2 (WS 2 ) nanosheets were applied as the cocatalysts for photocatalytic hydrogen evolution . Notably, the optimized hybrids exhibit excellent hydrogen evolution performance, which are over 31-fold (MoS 2 /CdS) and 47-fold (WS 2 /CdS) higher that of bare CdS counterpart, respectively. Hence, this work not only may pave the new way for the high-yield production of transition-metal dichalcogenides monolayers by liquid phase exfoliation, but also provide the possibility for the further efficiently exfoliating other two-dimension layered materials.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Boyu Zhou,Bicheng Wang,Jian Huang,Mengyu Liu,Chenhao Zhang,Ying Ye,Min Liu,Yuxiang Zhang,Xuanli Zheng,Chunmiao Zhang,Yiyan Cao,Feiya Xu,Xu Li,Yaping Wu,Zhiming Wu,Junyong Kang
Two-dimensional heterojunctions with a type-II band alignment have great potential for high-performance optoelectronic devices due to their inherent carrier separation properties. Herein, we synthesized lateral and vertical MoS 2 /WS 2 heterojunctions through a two-step chemical vapor deposition method and deeply investigated the impact of the interface structures on carrier separation efficiency. The experimental results demonstrate that the structures of MoS 2 /WS 2 heterojunctions can be controlled by adjusting the Mo/S ratio. In addition, lateral heterojunctions exhibit a significantly higher carrier separation efficiency than vertical heterojunctions. Specifically, the interlayer charge transfer time in the lateral heterojunction is approximately 1.2 ps, in contrast to the value of about 4.0 ps in the vertical heterojunction. First-principles simulation reveals that the lateral heterojunction has stronger interface coupling and orbital hybridization, contributing to its faster charge transfer rate. This work demonstrates the superiority of lateral heterojunctions in carrier separation, offering valuable insights for high-performance optoelectronic devices.
研究领域:
材料科学
·
纳米电子学
·
光电子学
·
二维材料
·
异质结构
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 45
·31211-31216
·
IF 4.449
Xiaolong Lu,Rongguo Wang,Lifeng Hao,Fan Yang,Weicheng Jiao,Ping Peng,Feng Yuan,Wenbo Liu
Oxidative etching has been proved to be an efficient top-down method to prepare quantum dots (QDs) of layered transition-metal dichalcogenides which possess unique properties and have potential applications in various areas. Here, one facile and green oxidative etching method induced by UV irradiation is reported to prepare the QDs of MoS2/WS2 in aqueous solution, respectively. A prominent morphology change occurred to the nanosheets of MoS2/WS2 after irradiation and finally they were etched to ultrasmall nanoparticles which were proved to be the QDs. Insight into the etching mechanism was discussed in detail and hydroxyl free radicals (˙OH) were conclusively demonstrated to play the main role in etching nanosheets. From another point of view, this work also proves the crucial long-term photo instability of MoS2/WS2 since there are increasing photo-related applications of them and points out an easy way to degrade their nanosheets.
研究领域:
材料科学
·
纳米技术
·
光化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhong Dong,Xu Wu,Mengying Chen,Hanxiao Chen,Ke-Jing Huang,Lingling Wang,Jing Xu
Pure phase MoS 2 has low conductivity, but with high theoretical specific capacity, and WS 2 possesses a high intrinsic conductivity, but suffer from rapid capacity fading. Predictably, the combination of these two transition metal sulfide compounds can complement each other and improve electrochemical performance comprehensively. Whereas, bimetallic phase sulfide of MoS 2 and WS 2 composites have not been researched in SIBs . In this paper, 1T metallic phase MoS 2 and WS 2 vertically growth on flexible carbon cloth (CC) surface (1T-MoS 2 @WS 2 @CC) by a simple hydrothermal method. The electrochemical performance was improved by heterojunction synergistic effect and the enhanced interlayers of the composite material. Specifically, the superelevation reversible capacity of 529.4 mAh/g can be obtained even after 100 cycles at the current density of 100 mA g −1 , and the 259.2 mAh/g capacity can be maintained even at high current density of 1000 mA g −1 after 60 cycles. Besides, the designed 1T-MoS 2 @WS 2 @CC composite material has excellent rate performance and cycle stability which are guarantee for battery core performance. Thus, there is every reason to believe that the advanced 1T-MoS 2 @WS 2 @CC electrode material has great potential in the future high performance energy storage devices.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hao Huang,Yonglin Lei,Ling Bai,Yao Liang,Han Yang
The morphology of CdS affects its photocatalytic properties and assembly efficiency of CdS-based heterojunction . In this study, various morphologies of CdS, including sloping plate, spherical, flower, lamellar and leaf were synthesized by adjusting different solvents and crystal control agents in solvothermal process. By comparison of geometric matching and photocatalytic activity of the multi-shaped CdS assembling with MoS 2 , the concept of point-flat-plate microstructure assembly was firstly introduced into construction of ternary quasi 2D/2D CdS/MoS 2 /WS 2 heterojunction. Owing to better geometric configuration, quasi 2D/2D CdS/MoS 2 /WS 2 heterojunction exhibited excellent characteristics of photocatalytic degradation of tetracycline . In this work, 97.2% of tetracycline (20 mg/L, 0.1 g/L dosage) was degraded within 60 min under the irradiation of 150 W Xenon light power, which was superior to other previously reported CdS heterojunctions.The enhancement of photocatalytic performance was due to the faster separation of photogenerated electrons and the lower recombination of electron-hole pairs in point-flat-plate CdS/MoS 2 /WS 2 heterojunction. This study provides a promising way to construct highly efficient photocatalyst and other micro-nano structures for different applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Xu,Zhong Dong,Yujin Li,Ke-Jing Huang,Kening Liu,Chengyuan Cao
Water system zinc ion batteries (ZIBs) displays the attractive advantages and it has been considered as the main energy storage device to replace lithium ion batteries (LIBs). Unfortunately, the existing cathode materials are far from achieving the excellent performance required by increasing energy consumption. In recent years, the popular MoS 2 materials still suffer from the inherent defects of poor electrical conductivity, unstable structure, and large volume expansion and lamellar stacking during charging and discharging, resulting in weak periodic stability and severely hindering its commercial applications. In view of the special requirements of cathode materials for ZIBs, this work innovatively proposes the construction of new-type ternary composite nanomaterials, comprehensively improve the practicability of MoS 2 materials. The experimental results confirm that the prepared MoS 2 @WS 2 @CC composite material has high specific capacity and excellent rate performance, due to the synergistic effect of conductive carbon fiber substrate and large layer spacing WS 2 which can improve the volume expansion and diffusion rate fundamentally. Therefore, we can predict that the MoS 2 @WS 2 @CC composite is expected to accelerate the commercial application of ZIBs, and provide ideas for the design of other energy storage materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2015
·Vol. 25
·期 7
·1127-1136
·
IF 11.805
Shengjie Xu,Dian Li,Peiyi Wu
In this work, uniform molybdenum disulfide (MoS 2 )/tungsten disulfide (WS 2 ) quantum dots are synthesized by the combination of sonication and solvothermal treatment of bulk MoS 2 /WS 2 at a mild temperature. The resulting products possess monolayer thickness with an average size about 3 nm. The highly exfoliated and defect-rich structure renders these quantum dots plentiful active sites for the catalysis of hydrogen evolution reaction (HER). The MoS 2 quantum dots exhibit a small HER overpotential of ≈120 mV and long-term durability. Moreover, the strong fluorescence, good cell permeability, and low cytotoxicity make them promising and biocompatible probes for in vitro imaging. In addition, this work may provide an alternative facile approach to synthesize the quantum dots of transition metal dichalcogenides or other layered materials on a large scale.
研究领域:
材料科学
·
生物医学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Physics Mechanics & Astronomy
·
2021
·Vol. 64
·期 10
·1-7
·
IF 5.122
Sun Baofan,Chen Jiajun,Zhou Xinyi,Liu Min,Wu Yaping,Xia Yuanzheng,Li Xu,Wu Zhiming,Kang Junyong
Heterostructures based on two-dimensional (2D) transition-metal dichalcogenides (TMDCs) possess unique electronic and optical properties, which open up unprecedented opportunities in nanoscale optoelectronic devices. Synthesizing high-quality 2D TMDC heterostructures with different core/shell size ratios is of great significance for practical applications. Here, we report a simple one-step chemical vapor deposition (CVD) method for fabricating MoS 2 /WS 2 lateral heterostructures with controllable core/shell size ratio. An ultrathin MoO 3 /WO 3 film prepared by thermal evaporation was used as the precursor, and a step-like heating process was adopted to separately grow MoS 2 and WS 2 monolayers by taking advantage of the different melting points of MoO 3 and WO 3 sources. High-quality MoS 2 /WS 2 lateral heterostructures with sharp interfaces were fabricated by optimizing the key growth parameters. Furthermore, the core/shell size ratio of heterostructures could be easily controlled by changing the thickness ratio of MoO 3 /WO 3 film, and an approximately linear dependence between them is revealed. Compared with MoS 2 or WS 2 monolayers, the MoS 2 /WS 2 heterostructure exhibited a shortened exciton lifetime owing to the type-II energy band alignment, which is conducive to the application of high-performance devices. This work provides a facile strategy for the synthesis of 2D lateral heterostructures with controllable size ratio.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
半导体异质结构
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）