PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
·
2018
·Vol. 255
·期 9
·1800254
·
IF 1.729
Jiao Shi,Di Wu,Xiaoming Zheng,Dingdong Xie,Fei Song,Xueao Zhang,Jie Jiang,Xiaoming Yuan,Yongli Gao,Han Huang
One-dimensional (1D) atomically thin crystals have attracted considerable interests due to their unique properties and potential applications. For example, reducing graphene physical size down to nanoscale to nanoribbons opens up band gaps, which makes graphene useful in electronic devices. Here, a facile approach to produce single- and bi-layered MoS 2 nanobelts by PMMA assisted decoupling of MoO 2 @MoS 2 core–shell nanorods is reported by the authors. Atomic force microscopy (AFM), Raman and photoluminescence (PL) results show that the decoupled monolayer staple-like MoS 2 -shells can fold into bilayer nanobelts during the PMMA removal process. Raman, high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) results reveal that the left MoO 2 nanorods exhibit high crystal-quality. These findings provide a method to produce 1D MoS 2 nanobelts, which have potential applications in electronics and catalysis.
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Physica Status Solidi-Rapid Research Letters
·
2019
·Vol. 13
·期 7
·1900063
·
IF 3.729
Di Wu,Jiao Shi,Xiaoming Zheng,Jinxin Liu,Weidong Dou,Yongli Gao,Xiaoming Yuan,Fangping Ouyang,Han Huang
One-dimensional (1D) atomically thin crystals have attracted considerable interest due to their unique properties and potential applications. Herein, the chemical vapor deposition (CVD) growth of molybdenum disulfide (MoS 2 ) nanoribbons on sapphire(0001) supported monolayer MoS 2 flakes without catalysts as well as the characterizations by means of Raman and photoluminescence (PL) spectroscopy, optical microscopy (OM), atomic force microscopy (AFM), and scanning transmission electron microscopy (STEM). The Raman and PL results is reported, as well as OM images reveal that such MoS 2 nanoribbons grow on monolayer MoS 2 flakes. STEM and selected area electron diffraction (SAED) results reveal that they are grown along the 〈 10 1 ¯ 0 〉 direction with atomically sharp edges. Controlled experiments show that the deficiency of sulfur vapor at the beginning of growth induced 1D MoO x S 2− x crystals as precursors. The subsequent sulfurization changes them into MoS 2 nanoribbons. These findings provide a facile approach to MoS 2 nanoribbons and enrich the horizon of the preparation of nanostructured transition metal dichalcogenides.
研究领域:
材料科学
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纳米科技
·
表面科学
·
凝聚态物理
·
低维材料
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PHYSICA B-CONDENSED MATTER
·
2020
·
IF 1.902
Si Xiao,Hui Wang,Yinglin Qin,Xiaoqin Li,Hao Xin,Gang Wang,Liang Hu,Yingwei Wang,Yejun Li,Weihong Qi,Jun He
A sandwich structure of black phosphorus nanosheets coupled with MoS 2 nanosheets was prepared via liquid exfoliation and hydrothermal methods . An enhancement of saturated absorption was observed at the long wavelength of 1550 nm via the femtosecond Z-scan technique, which is much stronger than its nonlinear response at 400 and 800 nm. According to the ultrafast pump-probe results, this strong saturated absorption can be attributed to the dominant role of a slow relaxation process, corresponding to the enhanced interface and defects effects. Moreover, the nonlinear refractive properties were found to transform from self-focusing to self-defocusing with the increasing of excitation wavelength from visible to near-infrared region, which can be qualitatively explained by an effective medium approach, similar to noble metal nanomaterials . These results suggest that the synthesized MoS 2 /BP/MoS 2 may have potential applications for nonlinear optical devices .
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3603-3612
·
IF 2.599
Wang Min,Han Xiuxun,Zhao Yun,Li Jiajia,Ju Peng,Hao Zhaomin
Nano-sized materials have attracted tremendous attentions because of their promising practical applications and theoretical values. The nano-sized materials are able to not only enhance the intrinsic properties of their bulk counterparts but also give birth to new promising properties. Herein, heterojunctions consisted of graphene oxide (GO) and three different MoS 2 nanostructures, including nanoflowers, nanoparticles, and quantum dots, were constructed and used as photocatalysts in water splitting. The electrochemical behavior and photocatalytic performance of MoS 2 /GO composites were found closely related to the particle size and morphology of MoS 2 . Compared to bulk MoS 2 /GO photocatalyst, nano-sized MoS 2 /GO heterostructures exhibited obviously enhanced performance in photocatalytic hydrogen generation. Benefitting from the surface effect and the quantum confinement in MoS 2 quantum dots, MoS 2 quantum dots/GO displayed the highest photocatalytic activities. This study indicates that the decrease in the dimension of MoS 2 can effectively increase the photocatalytic hydrogen evolution performance of MoS 2 /GO heterostructures, and thus suggests preferred strategy to design other HER photocatalysts based on MoS 2 .
研究领域:
材料科学
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纳米科技
·
光催化
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能源化学
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半导体物理
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表面科学
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可持续能源
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Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-7
·
IF 2.779
Ye Jian,Li Xueliang,Zhao Jianjun,Mei Xuelan,Li Qian
Two-dimensional (2D) material has many advantages including high carrier mobilities and conductivity, high optical transparency, excellent mechanical flexibility, and chemical stability, which made 2D material an ideal material for various optoelectronic devices. Here, we developed a facile method of preparing MoS 2 nanosheets followed by a facile liquid exfoliation method via ethyl cellulose-assisted doping and utilizing a plasma-induced p-doping approach to generate t effectively the partially oxided MoS 2 (p-MoS 2 ) nanosheets from the pristine n-type nanosheets. Moreover, an n-p junction type MoS 2 photodetector device with the built-in potentials to separate the photogenerated charges is able to significantly improved visible light response. We have fabricated photodetector devices consisting of a vertically stacked indium tin oxide (ITO)/pristine n-type MoS 2 nanosheets/p-MoS 2 /Ag structure, which exhibit reasonably good performance illumination, as well as high current values in the range of visible wavelength from 350 to 600 nm. We believe that this work provides important scientific insights for photoelectric response properties of emerging atomically layered 2D materials for photovoltaic and other optoelectronic applications.
研究领域:
材料科学
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纳米技术
·
光电子学
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半导体器件
·
光子学
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shiting Li,Yuehan Wang,Chang Cai,Hong Huang,Honggen Peng,Xiaoxiao Fu,Zhimin Ao,Chunyang Nie
MoS 2 polytypes are emerging as compelling metal-sulfide catalysts for peroxymonosulfate (PMS) activation in water decontamination. The catalytic properties of the 1 T and 2H phases have been extensively explored, the performance of the 3 R polytype remains largely unknown. This work presents a comparative investigation of bulk 2H-MoS 2 and 3R-MoS 2 for activating PMS to remove phenol, with a specific focus on the understudied 3 R phase. A ball-milling pretreatment was employed to create sulfur vacancies, a critical active site, in both polytypes. Through a combined experimental and theoretical approach, we demonstrate that sulfur-defective 2H-MoS 2 exhibits superior catalytic activity for PMS activation, with a phenol degradation reaction rate constant 4.3 times higher than that of its 3 R counterpart. More importantly, we unveil that both polytypes activate PMS predominantly via a nonradical pathway mediated by surface Mo-PMS⁎ complexes, rather than generating free radicals. However, in-situ Raman spectroscopy and DFT calculations reveal that the distinct electronic structures of the two polytypes lead to the formation of Mo-PMS complexes with different configurations and oxidative capabilities, explaining their disparate selectivity towards various organic pollutants. This study provides the first mechanistic insight into PMS activation by 3R-MoS 2 and establishes that the crystal polytype is a critical, previously overlooked factor governing the efficiency and oxidation pathway in MoS 2 -based advanced oxidation processes, offering a vital guideline for selecting suitable MoS 2 catalysts in environmental applications.
研究领域:
环境催化
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高级氧化工艺
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材料科学
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水处理
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纳米材料
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ACS Omega
·
2023
·
IF 4.1
Chuangchuang Yang,Anpeng Hu,Qiaoling Dai,Qinghe Yang,Ranran Hou,Zhiwei Liu
Hydrodesulfurization (HDS) is an important process for the production of clean fuel oil, and the development of a new environmentally friendly, low-cost sulfided catalyst is key research in hydrogenation technology. Herein, commercial bulk MoS2 and NiCO3·2NiOH2·4H2O were first hydrothermally treated and then calcined in a H2 or N2 atmosphere to obtain Ni–MoS2 HDS catalysts with different structures. Mechanisms of hydrothermal treatment and calcination on Ni–MoS2 catalyst structures were investigated by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy (XPS). The catalytic performance of Ni–MoS2 catalysts was evaluated by the HDS reaction of dibenzothiophene (DBT) on a fixed bed reactor, and the structure–activity relationship between the structures of the Ni–MoS2 catalyst and the HDS of DBT was discussed. The results showed that the lateral size, the number of stacked layers, and the S/Mo atomic ratio of MoS2 in the catalyst decreased and then increased with the increase of the hydrothermal treatment temperature, reaching the minimum at the hydrothermal treatment temperature of 150 °C, i.e., the lateral size of MoS2 in the catalyst was 20–36 nm, the number of stacked layers of MoS2 was 5.4, and the S/Mo ratio in the catalyst was 1.80. In addition, the effects of different calcination temperatures and calcination atmospheres on the catalyst structures were investigated at the optimum hydrothermal treatment temperature. The Ni–Mo–S and NixSy ratios of the catalysts increased and then decreased with the increasing calcination temperature under a H2 atmosphere, reaching a maximum at a calcination temperature of 400 °C. Therefore, DBT exhibited the best HDS activity over the H-NiMo-150–400 catalyst, and the desulfurization rate of DBT reached 94.7% at a reaction temperature of 320 °C.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Kui Zhang,Mingquan Ye,Aijun Han,Jiling Yang
In this study, molybdenum disulfide-reduced graphene oxide (MoS 2 -RGO) composites, as ideal electromagnetic (EM) wave absorbing materials, were synthesized by one-step hydrothermal method , and their morphology, components, structure and EM wave absorbing performances were characterized. The results show that the EM wave absorbing performances of MoS 2 -RGO composites were dependent on the graphene oxide (GO) content. When the original amount of GO was 20 mg, the minimum reflection loss (RL) value of MoS 2 -RGO composites was −48.54 dB at 6.70 GHz with a thickness of 3.5 mm, and effective reflection losses were obtained in a wide range of 3.98–15.28 GHz with the thickness of 2.0–5.0 mm. Especially, the 3 mm and 8 mm wave attenuation performances of composites were explored in detail, and the maximum attenuation values were 21.75 and 21.83 dB, respectively. In consequence, MoS 2 -RGO composites are expected to be good electromagnetic wave absorbing materials in broadband.
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Small
·
2024
·Vol. 21
·期 1
·2407337
·
IF 13
Linlong Xing,Haoran Cheng,Yang Li,Qiang Chen,Chuntai Liu,Changyu Shen,Xianhu Liu
The design and development of high-quality electromagnetic waves (EMW) absorbing materials play a vital role in combating the escalating negative effects of microwave radiation and interference. Herein, MoS 2 @Co/NC@CF fibrous membranes are successfully fabricated by electrospinning technology and carbonization, and a molybdenum disulfide (MoS 2 ) layer is synthesized on the surface of these fibers via hydrothermal method. The seed-assisted growth method not only effectively avoids the accumulation and improves the loading of ZIF-67 particles, so as to ensure that the magnetic components in the fibers are evenly distributed in a wider range, rather than only intermittently present in some sites. Meanwhile, the introduction of semiconductor MoS 2 as the shell further optimizes the impedance matching and improves the EMW absorption performance of the carbon fibrous membranes: the minimum reflection loss (RL min ) is −67.56 dB, and the maximum effective absorption bandwidth (EAB max ) is further expanded to 6.56 GHz (2.1 mm, 11.44–18 GHz). This work provides a feasible method for developing high-efficient EMW-absorbing materials.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Xuechang Ren,Suying Ding,Renhua Chen,Ning Fu
This study addresses the limited Fe 3+ /Fe 2+ conversion in homogeneous Fenton-like systems by introducing reducing MoS₂ as a co-catalyst to the Fe 3+ /PMS system, while simultaneously investigating the effect of MoS₂ crystal structure on reaction kinetics. Hydrothermally synthesized 1 T/2H-MoS₂ (denoted as M-x) significantly enhanced phenol degradation in the Fe 3+ /PMS system. Among the catalysts, M-180 demonstrated optimal performance, achieving 91.14 % phenol degradation within 20 min. XPS analysis revealed a positive correlation between 1 T-phase content and degradation efficiency, confirming that 1 T-MoS₂ facilitates Fe 3+ /Fe 2+ redox cycling to promote efficient PMS activation. Radical quenching experiments and electron paramagnetic resonance (EPR) spectroscopy further identified SO₄· − , 1 O₂, and O₂· − as the primary reactive species.
研究领域:
环境化学
·
催化
·
纳米材料
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水处理
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高级氧化工艺
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 8
·2715-2721
·
IF 4.052
Lin Lin,Siyu Huang,Yuxin Zhu,Biao Du,Zhihua Zhang,Chao Chen,Xuewen Wang,Ning Zhang
A new synthetic method was used to develop a CdS/MoS2 heterojunction. Cd-MOF was coated onto the surface of MoS2 flowers to construct a core–shell MoS2@Cd-MOF. Thioacetamide was used as a sulfur source to sulfurize the MoS2@Cd-MOF to form a CdS/MoS2 heterojunction. Since the Cd2+ ions were highly ordered and separated by the organic ligands of the Cd-MOF shell, the as-synthesized CdS/MoS2 heterojunction possessed a large surface area and intimate contact at the heterogeneous interface with a uniform loading of CdS nanoparticles on the MoS2 flowers. Consequently, the CdS/MoS2 heterojunction exhibited a significantly enhanced photocatalytic H2 evolution rate of average 5587 μmol h−1 g−1 under UV-visible light irradiation.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hang Su,Hanxiao Tang,Zhijuan Zhang,Weisheng Feng,Hongming Lou
The rational design of nanoreactors is of paramount importance for synergistically optimizing light absorption, photogenerated carrier separation efficiency, and surface reactions to enhance photothermal catalytic hydrogen production. In this study, we constructed a nanoreactor with spatially ordered distribution of MoS₂ on the inner surface of hollow ZnIn₂S₄ (ZIS) through a one-pot hydrothermal method. Benefiting from its scientifically designed architecture, the nanoreactor exhibits exceptional photothermal hydrogen evolution activity of 33.6 mmol g −1 h −1 , which is 2.3-fold and 18.7-fold higher than those of pristine ZIS and MoS₂, respectively. UV–vis diffuse reflectance spectroscopy (UV–vis DRS) confirmed that the incorporation of MoS₂ extends the light absorption edge of the nanoreactor beyond 1000 nm, significantly enhancing the photothermal conversion efficiency of ZIS to 14.6 %. Thermal participation in the photothermal hydrogen evolution process reduced the apparent activation energy to 9.8 kJ mol −1 (70.9 % lower than conventional ZIS), indicating that the photothermal effect improve the reaction kinetics effectively. This phenomenon aligns with the temperature-dependent time-resolved fluorescence spectroscopy results of the accelerated photogenerated carrier kinetics under thermal assistance. In situ Kelvin probe force microscopy (KPFM) detected a 0.2 eV increase in the Schottky barrier height of the optimized nanoreactor under photoexcitation, effectively suppressing carrier recombination. Combined with density functional theory (DFT) calculations, these results elucidate the existence of a built-in electric field at the nanoreactor interface, which not only inhibits charge recombination but also optimizes the Gibbs free energy of H* intermediate adsorption (0.11 eV), thereby intensifying surface catalytic reactions. This study elucidates the synergistic mechanisms of core-shell structures in enhancing light absorption, improving carrier separation efficiency, and optimizing surface reaction kinetics, providing theoretical guidance for the cooperative improvement of photothermal hydrogen production activity.
研究领域:
纳米技术
·
光催化
·
材料科学
·
能量转换
·
物理化学
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