INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Chao Yu,Zhan-fang Cao,Fan Yang,Shuai Wang,Hong Zhong
The reduction of active sites due to reunion and slow electron transfer rates and low electronegativity greatly reduced the catalytic performance of many two-dimensional materials. In this paper, we synthesized composites for partially reducing graphene oxide and molybdenum disulfide (MoS 2 @prGO) by one-step hydrothermal method . With the addition of triethanolamine , MoS 2 is highly dispersed on the prGO carrier and converted into the 1T phase MoS 2 (50.4%). Meanwhile, it helps to increase the electron transfer rate of the MoS 2 @prGO composites. MoS 2 @prGO composites presents a high electron cloud density due to the existence of N atoms and prGO, which promotes the occurrence of hydrogen ion conversion hydrogen reaction and decreases the electrocatalytic hydrogen evolution overpotential. MoS 2 @prGO composites exhibits an overpotential of 263 mV at 10 mA/cm 2 and a small Tafel slope of 60 mV/dec. This work is devoted to offer a new prospect and direction for the improvement of electrochemical HER performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·9640-9649
·
IF 2.478
Ding Xiao,Fan Guang,Huang Yi,Wang Jianguo
Reduced graphene oxide-molybdenum disulfide (RGO-MoS 2 ) loaded Fe 3 O 4 nanoparticles composite (RGO-MoS 2 -Fe 3 O 4 ) is prepared via two-step hydrothermal reaction. RGO-MoS 2 possesses three dimension architecture structures. This structure can prevent RGO and MoS 2 nanosheets restacked together and provide substrates for the Fe 3 O 4 nanoparticle decoration. The sizes of Fe 3 O 4 are in the range of 5–20 nm. As a microwave absorbent: the minimum reflection loss (R L ) value is -47.67 dB at 17.44 GHz when the thickness is only 1.5 mm. The absorption bandwidth (R L < −10 dB) can reach 4.72 GHz with the thickness is 1.7 mm. Compared with the previously reported literature, RGO-MoS 2 -Fe 3 O 4 nanocomposite exhibits excellent microwave absorption performance and can be served as an light-weight microwave absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 32
·13728-13737
·
IF 3.288
Jiaqian Lu,Zhe Zhang,Lin Cheng,Hong Liu
Herein, a series of MoS2-wrapped Mn0.2Cd0.8S nanospheres with different MoS2 content were fabricated via a two-step hydrothermal route. The photocatalytic activity of the as-prepared MoS2/Mn0.2Cd0.8S composites for H2 production and reduction of CO2 under visible light irradiation was investigated. The results demonstrated that the ultra-thin MoS2 nanosheets were uniformly wrapped on the surface of cauliflower-like Mn0.2Cd0.8S nanospheres, and an intimate interfacial contact was formed between MoS2 and Mn0.2Cd0.8S. The MoS2/Mn0.2Cd0.8S hybrids exhibited significantly enhanced photocatalytic activity compared with the pristine Mn0.2Cd0.8S. The optimal MoS2 loading content was determined to be 3.0 wt%, giving a H2 production rate of 335.02 μmol h−1 and a CH3OH production rate of 2.13 μmol h−1, which were around 5.1 and 5.4 times that of bare Mn0.2Cd0.8S, respectively. The superior photocatalytic activity was predominantly attributed to the intimate contacts between Mn0.2Cd0.8S and MoS2, which facilitated the transfer and separation of the photoexcited charge carriers. Moreover, the as-synthesized MoS2/Mn0.2Cd0.8S composites also showed excellent stability. This study demonstrates the great potential of MoS2-wrapped Mn0.2Cd0.8S as a noble-metal-free catalyst for photocatalytic energy conversion.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Nanoscale Advances
·
2022
·Vol. 4
·期 24
·5290-5296
·
IF 5.598
Pei-Yu Huang,Hong-Ji Chen,Jing-Kai Qin,Liang Zhen,Cheng-Yan Xu
Mixed-dimensional van der Waals (vdW) integration has been demonstrated to be effective for the modulation of the physical properties of homogeneous materials. Herein, we reported the enhancement of photothermal conversion and decrease of thermal conductivity in metallic single-walled carbon nanotube (SWCNT) films with the integration of chemical vapor deposition-grown monolayer MoS2 films. The induced temperature gradient in SWCNT–MoS2 hybrid films drives carrier diffusion to generate photocurrent via the photothermoelectric (PTE) effect, and a self-powered photodetector working in the visible band range from 405 to 785 nm was demonstrated. The maximum responsivity of the device increases by 6 times compared to that of the SWCNT counterpart. More importantly, the mixed-dimensional device exhibits polarization-dependent photogeneration, showing a large anisotropy ratio of 1.55. This work paves a way for developing high-performance, polarization-sensitive photodetectors by mixed-dimensional integration.
研究领域:
纳米光子学
·
凝聚态物理
·
材料科学
·
半导体器件
·
光电探测技术
✓ 已验证
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2017
·
IF 1.588
Guan Li,Fenxue Tan,Bokun Lv,Mengying Wu,Ruiqi Wang,Yue Lu,Xu Li,Zhiqiang Li,Feng Teng
Molybdenum disulfide nanosheets have been synthesized by one-pot method using 1-ODT as sulfur source and surfactant . The structure, morphology and optical properties of samples were investigated by XRD , FTIR , Abs spectrum and TEM patterns. The XRD pattern indicated that the as-obtained MoS 2 belong to hexagonal system. The as-obtained MoS 2 nanosheets blending with PVK could be used to fabricate an electrically bistable devices through a simple spin-coating method and the device exhibited an obvious electrical bistability properties. The charge transport mechanism of the device was discussed based on the filamentary switching models.
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Di Wu,Yingguo Yang,Peng Zhu,Xiaoming Zheng,Xiaoliu Chen,Jiao Shi,Fei Song,Xingyu Gao,Xueao Zhang,Fangping Ouyang,Xiang Xiong,Yongli Gao,Han Huang
Molybdenum dioxide (MoO2) has attracted many interests due to its unique properties and potential applications. Here, we report the synthesis of high quality MoO2@MoS2 nanorods on c-sapphire substrates through an atmospheric pressure chemical vapor deposition (APCVD) approach. Optical microscopy (OM), cross-sectional scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and (grazing incidence) X-ray diffraction ((GI)XRD) measurements reveal that these MoO2 nanorods exhibit epitaxial growth behaviors on c-sapphire substrates with the orientation relationship of MoO2(100)∥sapphire(0001) and MoO2 ⟨001⟩ aligned well with sapphire ⟨101̅0⟩. Raman spectroscopy/imaging, energy dispersive spectroscopy (EDS), and GIXRD results disclose that such MoO2 nanorods are wrapped by MoS2 (MoO2@MoS2). Devices based on transferred individual MoO2@MoS2 nanorods show a resistivity of ∼1.65 × 10–4 Ω·cm, comfirming that such nanorods possess higher crystalline degree. Our findings will be helpful for the applications of MoO2@MoS2 in the fields of nanoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
凝聚态物理
·
电子器件
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Lei Wang,Xiaohong Ji,Ting Wang,Qinyuan Zhang
Electrically driven red emission from MoS2–MoO2–MoO3 (MS-MO) hybrid-based metal–semiconductor–metal (MSM) devices is reported for the first time. MoO3 belts with high crystal quality and sufficient size are synthesized by thermal deposition. A layer of MS-MO hybrid is then produced on the belt surface to form MoO3/MS-MO core–shell by sulfurization. The devices exhibit unique electrical properties, a nonlinear I–V curve, and electric hysteresis characteristics at high applied biases (>2.4 V), where MS-MO hybrids act as electron transport channels. The electroluminescent current of the device increases to a set current limit over time when a constant bias is applied. The novel characteristics of the device are attributed to the space charge limited conduction (SCLC) mechanism occurring in MS-MO hybrids. The strong light emission is from recombination of excitons within the MoS2 phase. This work develops a simple and effective method to drive MoS2 to emit light on a large scale without using monolayer MoS2 and vertical p–n junctions, indicating great potential for future 2D optoelectronics and photonics applications.
研究领域:
材料科学
·
纳米电子学
·
光电子学
·
光子学
·
半导体器件
·
二维材料
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Wei Zheng,Weicheng Huang,Feng Gao,Huihui Yang,Mingjin Dai,Guangbo Liu,Bin Yang,Jia Zhang,Yong Qing Fu,Xiaoshuang Chen,Yunfeng Qiu,Dechang Jia,Yu Zhou,PingAn Hu
Two-dimensional (2D) layered materials, such as MoS2, are greatly attractive for flexible devices due to their unique layered structures, novel physical and electronic properties, and high mechanical strength. However, their limited mechanical strains (<2%) can hardly meet the demands of loading conditions for most flexible and stretchable device applications. In this Article, inspired from Kirigami, the ancient Japanese art of paper cutting, we design and fabricate nanoscale Kirigami architectures of 2D layered MoS2 on a soft substrate of polydimethylsiloxane (PDMS) using a top-down fabrication process. Results show that the Kirigami structures significantly improve the reversible stretchability of flexible 2D MoS2 electronic devices, which is increased from 0.75% to ∼15%. This increase in flexibility is originated from a combination of multidimensional deformation capabilities from the nanoscale Kirigami architectures consisting of in-plane stretching and out-of-plane deformation. We further discover a new fundamental relationship of electrical conductance and large strain in MoS2 Kirigami structures through both experimental work and finite element simulation. Results show that the electrical conductance of the stretchable MoS2 Kirigami is closely related to its different stages of structural evolutions under strain: e.g., elastic stretching; then a combination of elastic stretching and out-of-plane buckling; and finally stretching and structural damage. This method provides a new opportunity to fabricate highly flexible and stretchable sensors and actuators using different types of 2D materials.
研究领域:
材料科学
·
纳米技术
·
柔性电子学
·
机械工程
·
应用物理
✓ 已验证
DOI
高影响因子
TRIBOLOGY LETTERS
·
2023
·Vol. 71
·期 4
·120
·
IF 3.2
Miao Yan,Zhong Chonglong,Li Zhixiang,Xu Yong,Hu Enzhu,Hu Kunhong
Carbon soot (CS) is a contaminant of engine oil, and the interaction between CS and oil additives should be understood. This work investigated the interaction between CS and nano-MoS 2 . Results show that adding 0.5% nano-MoS 2 in polyalphaolefin significantly improved the lubricity. However, the lubricity of nano-MoS 2 unexpectedly disappeared after adding 0.5% CS because CS prevented nano-MoS 2 from forming a tribofilm. Interestingly, the lubricity was mostly recovered by ZDDP, which removed the inhibition of CS by helping form a MoS 2 -contained tribofilm. Another method was also found to remove the inhibition without the help of ZDDP, that is, replacing nano-MoS 2 with nano-MoS 2 /nano-TiO 2 heterostructures. Nano-TiO 2 was immune to soot and could carry nano-MoS 2 into the friction interface by their heterojunction to synergistically form a tribofilm. Graphical abstract
研究领域:
摩擦学
·
材料科学
·
润滑油添加剂
·
纳米材料
✓ 已验证
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 35
·14514-14522
·
IF 6.7
Lun Tan,Xianzhen Liu,Peng Wu,Liwei Cao,Wei Li,Ang Li,Zhao Wang,Haoshuang Gu
The research and development of high-performance NH3 sensors are of great significance for environment monitoring and disease diagnosis applications. Two-dimensional (2D) MoS2 nanomaterials have exhibited great potential for building room-temperature (RT) NH3 sensors but still suffer from relatively low sensitivity. Herein, the TiO2-modified monolayer MoS2 films with controllable TiO2 loading contents are fabricated by a facile approach. A remarkable enhancement in the RT NH3 sensing performance is achieved after the n–n hetero-compositing of the TiO2/MoS2 system. The device with 95% surface coverage of TiO2 shows enhanced sensor response, low detection limit (0.5 ppm), wide detection range (0.5–1000 ppm), good repeatability, and superior selectivity against other gases. In situ Kelvin potential force microscopy results revealed that the TiO2 modification not only improved the surface reactivity of the sensing layers but also contributed to the NH3 sensing performance by serving as the “gas-gating” layers that modulated the electron depletion layer and the conductivity of the MoS2 films. Such an n–n hetero-compositing strategy can provide a simple and cost-effective approach for developing high-performance NH3 sensors based on 2D semiconductors.
研究领域:
材料科学
·
气体传感
·
纳米技术
·
半导体器件
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 15
·期 11
·11555-11566
·
IF 1.5
Yanmei Liao,Weijun Ye,Yinghong Zhu,Lianbang Wang
Electrochemical N 2 reduction reaction (NRR) provides a quite potential method for ammonia (NH 3 ) synthesis under ambient conditions, while it requires efficient and durable catalysts. In this communication, we report an ultrathin nanosheets MoS 2 that acts as electrocatalyst for NRR, which assumed excellent selectivity. In 0.1 M Na 2 SO 4 with N 2 -saturation under ambient conditions, this electrocatalyst at -0.6 V vs. reversible hydrogen electrode (RHE) exhibited a large NH 3 yield of 41.66 μg h -1 mg -1 cat . and a Faradaic efficiency (FE) of 1.10%. Furthermore, the electrochemical stability is also exhibiting excellent.
研究领域:
材料科学
·
电化学
·
催化
·
可持续能源
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 7
·2241-2246
·
IF 8.897
Yang Mingming,Wang Longlong,Hu Guofeng,Chen Xue,Gong Peng Lai,Cong Xin,Liu Yi,Yang Yuanbo,Li Xiaoli,Zhao Xiaohui,Liu Xuelu
The interlayer coupling in van der Waals (vdW) heterostructures (vdWHs) is at the frontier of the fundamental research, underlying many optical behaviors. The graphene/MoS 2 vdWHs provide an ideal platform to reveal the good interfacial coupling between graphene and MoS 2 constituents. Here, three groups of graphene/MoS 2 vdWHs were prepared by transferring 1–3 layers of graphene onto monolayer MoS 2 . The interlayer coupling within graphene/MoS 2 vdWHs were characterized and analyzed by Raman spectroscopy, photoluminescence (PL) spectroscopy and optical contrast (OC) spectroscopy. The upshift of the A 1g peak of MoS 2 and the upshift of the D and 2D peaks of SLG show that the electrons move from MoS 2 to graphene accompanied by the dielectric shielding effect on graphene. The weakened PL intensities and the slight red shift of A peak prove that the electrons move from MoS 2 to graphene meanwhile the recombination of hole and electron pairs is blocked in vdWHs. Our results deepen the understanding of the interlayer coupling of graphene/MoS 2 vdWHs and therefore provide guidelines for the practical design and application of optoelectronic devices based on graphene/MoS 2 vdWHs.
研究领域:
凝聚态物理
·
材料科学
·
光电子学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）