TiS2

/Tag: TiS2

Ultrafast Saturable Absorption in TiS2 Induced by Non-Equilibrium Electrons and Generation of Femtosecond Mode-Locked Laser

2018-04-30T14:24:24+00:00 April 30th, 2018|Categories: Publications|Tags: , |

Nanoscale, 2018, Accepted ManuscriptDOI: 10.1039/C8NR01573B, PaperXiangling Tian, Rongfei Wei, Meng Liu, Chunhui Zhu, Zhichao Luo, Fengqiu Wang, Jianrong QiuAbstract: Non-equilibrium electrons induced by ultrafast laser excitation in a correlated electron material can disturb the Fermi energy as well as optical nonlinearity. Here, non-equilibrium

Published in: "RSC Nanoscale".

A low-temperature and facile solution-processed two-dimensional TiS2 as an effective electron transport layer for UV-stable planar perovskite solar cell

2018-04-13T11:17:59+00:00 April 13th, 2018|Categories: Publications|Tags: |

J. Mater. Chem. A, 2018, Accepted ManuscriptDOI: 10.1039/C8TA01143E, PaperGuannan Yin, Huan Zhao, Jiangshan Feng, Jie Sun, Junqing Yan, Zhike Liu, Shenghuang LIN, Shengzhong LiuThe charge transport layers (CTLs) play a great role in achieving high efficient and stable perovskite solar cells (PSCs). Recently,

Published in: "Journal of Materials Chemistry A".

Solution-printable fullerene/TiS2 organic/inorganic hybrids for high-performance flexible n-type thermoelectrics

2018-03-27T08:28:23+00:00 March 27th, 2018|Categories: Uncategorized|Tags: , |

Energy Environ. Sci., 2018, Advance ArticleDOI: 10.1039/C7EE03617E, PaperLiming Wang, Zimeng Zhang, Linxiao Geng, Tianyu Yuan, Yuchen Liu, Juchen Guo, Lei Fang, Jingjing Qiu, Shiren WangFlexible and solution-printable fullerene/TiS2 organic/inorganic hybrids with excellent thermoelectric properties are demonstrated.To cite this article before page numbers are assigned, use the DOI form of citation above.The content of this RSS Feed (c) The Royal Society of Chemistry

Published in: "Energy & Environmental Science".

Two-dimensional transition metal dichalcogenides as metal source of metal-organic frameworks

2018-03-20T14:31:05+00:00 March 20th, 2018|Categories: Publications|Tags: |

Chem. Commun., 2018, Accepted ManuscriptDOI: 10.1039/C8CC01258J, CommunicationYanwei Sun, Shen Hu, Chunshan Song, Shu Miao, Zhou Jiang, Xue Jiang, Jijun Zhao, Xinwen Guo, Yi LiuBy taking advantage of the layered structure and decent M-X bond strength of transition metal dichalcogenides (TMDCs), herein versatile Ti-MOFs were successfully prepared with layered titanium disulfide (TiS2) as titanium…The content of this RSS Feed (c) The Royal Society of Chemistry

Published in: "Chemical Communications".

Titanium contacts to graphene: process-induced variability in electronic and thermal transport

2018-02-16T10:30:35+00:00 February 16th, 2018|Categories: Publications|Tags: , |

Contact resistance ( R C ) is a major limiting factor in the performance of graphene devices. R C is sensitive to the quality of the interface and the composition of the contact, which are affected by the graphene transfer process and contact deposition conditions. In this work, a linear correlation is observed between the composition of Ti contacts, characterized by x-ray photoelectron spectroscopy, and the Ti/graphene contact resistance measured by the transfer length method. We find that contact composition is tunable via deposition rate and base pressure. Reactor base pressure is found to effect the resultant contact resistance. The effect of contact deposition conditions on thermal transport measured by time-domain thermoreflectance is also reported. Interfaces with higher oxide composition appear to result in a lower thermal boundary conductance. Possible origins of this thermal boundary conductance change with oxide composition are discus…

Published in: "Nanotechnology".

Illuminating interlayer interactions

2018-02-12T16:31:04+00:00 February 12th, 2018|Categories: Publications|Tags: |

Illuminating interlayer interactionsIlluminating interlayer interactions, Published online: 12 February 2018; doi:10.1038/s41563-018-0027-3A synchrotron X-ray diffraction experiment demonstrates an unexpected accumulation of electron density in the interlayer region of TiS2, and provides a benchmark for theoretical models of weak interlayer bonding.

Published in: "Nature Materials".

X-ray electron density investigation of chemical bonding in van der Waals materials

2018-02-12T16:31:04+00:00 February 12th, 2018|Categories: Publications|Tags: |

X-ray electron density investigation of chemical bonding in van der Waals materialsX-ray electron density investigation of chemical bonding in van der Waals materials, Published online: 12 February 2018; doi:10.1038/s41563-017-0012-2Electron density in TiS2 is determined by synchrotron X-ray diffraction, which reveals significant differences between experimental data and theory for interlayer van der Waals interactions.

Published in: "Nature Materials".

A study of electron and thermal transport in layered Titanium disulphide single crystals. (arXiv:1801.04677v1 [cond-mat.mes-hall])

2018-01-16T19:59:07+00:00 January 16th, 2018|Categories: Publications|Tags: |

We present a detailed study of thermal and electrical transport behavior of single crystal Titanium disulphide flakes, which belongs to the two dimensional, transition metal dichalcogenide class of materials. In-plane Seebeck effect measurements revealed a typical metal-like linear temperature dependence in the range of 85 – 285 K. Electrical transport measurements with in-plane current geometry exhibited a nearly T^2 dependence of resistivity in the range of 10 – 300 K. However, transport measurements along the out-of-plane current geometry showed a transition in temperature dependence of resistivity from T^2 to T^5 beyond 200 K. Interestingly, Au ion-irradiated TiS2 samples showed a similar T 5 dependence of resistivity beyond 200 K, even in the current-in-plane geometry. Micro- Raman measurements were performed to study the phonon modes in both pristine and ion-irradiated TiS2 crystals.

Published : "arXiv Mesoscale and Nanoscale Physics".

Cryo-mediated exfoliation and fracturing of layered materials into 2D quantum dots

2017-12-15T20:32:19+00:00 December 15th, 2017|Categories: Publications|Tags: , , , , |

Atomically thin quantum dots from layered materials promise new science and applications, but their scalable synthesis and separation have been challenging. We demonstrate a universal approach for the preparation of quantum dots from a series of materials, such as graphite, MoS2, WS2, h-BN, TiS2, NbS2, Bi2Se3, MoTe2, Sb2Te3, etc., using

Published in: "Science Advances".

Titanium Disulfide Coated Carbon Nanotube Hybrid Electrodes Enable High Energy Density Symmetric Pseudocapacitors

2017-12-11T16:31:36+00:00 December 11th, 2017|Categories: Publications|Tags: , |

Abstract While electrochemical supercapacitors often show high power density and long operation lifetimes, they are plagued by limited energy density. Pseudocapacitive materials, in contrast, operate by fast surface redox reactions and are shown to enhance energy storage of supercapacitors. Furthermore, several reported systems exhibit high capacitance but restricted electrochemical voltage windows, usually no more than 1 V in aqueous electrolytes. Here, it is demonstrated that vertically aligned carbon nanotubes (VACNTs) with uniformly coated, pseudocapacitive titanium disulfide (TiS2) composite electrodes can extend the stable working range to over 3 V to achieve a high capacitance of 195 F g−1 in an Li-rich electrolyte. A symmetric cell demonstrates an energy density of 60.9 Wh kg−1—the highest among symmetric pseudocapacitors using metal oxides, conducting polymers, 2D transition metal carbides (MXene), and other transition metal dichalcogenides. Nanostructures prepared by an atomic layer deposition/sulfurization process facilitate ion transportation and surface reactions to result in a high power density of 1250 W kg−1 with stable operation over 10 000 cycles. A flexible solid-state supercapacitor prepared by transferring the TiS2–VACNT composite film onto Kapton tape is demonstrated to power a 2.2 V light emitting diode (LED) for 1 min. TiS2 is coated coaxially onto vertically aligned carbon nanotubes (VACNTs) via an atomic layer deposition sulfurization process, providing an exceptionally high capacitance of 195 F g-1 and working voltage window up to 3 V in an Li+ ion rich (21 m) electrolyte. The Energy density of a supercapacitor based on TiS2–VACNT electrodes is enhanced to 60.9 Wh kg-1,

Published in: "Advanced Materials".

Metallic 1T-TiS2 nanodots anchored on a 2D graphitic C3N4 nanosheet nanostructure with high electron transfer capability for enhanced photocatalytic performance

2017-12-05T10:29:14+00:00 December 5th, 2017|Categories: Publications|Tags: |

RSC Adv., 2017, 7,55269-55275DOI: 10.1039/C7RA10826E, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Yang Liu, Xiaojie She, Xiaoni Zhang, Chenglu Liang, Jingjie Wu, Peng Yu, Yusuke Nakanishi, Banghu Xie, Hui Xu, Pulickel[space]M. Ajayan, Wei YangThe introduction

Published in: "RSC Advances".

Titanium Contacts to Graphene: Process-Induced Variability in Electronic and Thermal Transport. (arXiv:1712.00331v1 [cond-mat.mtrl-sci])

2017-12-04T19:58:59+00:00 December 4th, 2017|Categories: Publications|Tags: , |

Contact Resistance (RC) is a major limiting factor in the performance of graphene devices. RC is sensitive to the quality of the interface and the composition of the contact, which are affected by the graphene transfer process and contact deposition conditions. In this work, a linear correlation is observed between the composition of Ti contacts, characterized by X-ray photoelectron spectroscopy, and the Ti/graphene (Gr) contact resistance measured by the transfer length method. We find that contact composition is tunable via deposition rate and base pressure. Reactor base pressure is found to effect the resultant contact resistance. The effect of contact deposition conditions on thermal transport measured by time-domain thermoreflectance is also reported and interfaces with higher oxide composition appear to result in a lower thermal boundary conductance. Possible origins of this thermal boundary conductance change with oxide composition are discussed.

Published in: "arXiv Material Science".

Improved Biocompatibility of Black Phosphorus Nanosheets by Chemical Modification

2017-10-13T20:26:50+00:00 October 13th, 2017|Categories: Publications|Tags: , |

Ultrasmall black phosphorus nanosheets (BPs) can trigger systemic inflammations. In their Communication (DOI: 10.1002/anie.201706228) X.-F. Yu, G. Jiang et al. report a method to reduce this side effect by surface modification of bare BPs with titanium sulfate ([email protected]). The girl represents a potential candidate exposed to bare BPs through various routes during a wide application of this material. The effect of the bare BPs is shown by red shading. The BPs are less harmful after conversion to [email protected]

Published in: "Angewandte Chemie International Edition".

Palladium Nanoparticles Anchored on Anatase Titanium Dioxide-Black Phosphorus Hybrids with Heterointerfaces: Highly Electroactive and Durable Catalysts for Ethanol Electrooxidation

2017-10-04T08:28:56+00:00 October 4th, 2017|Categories: Publications|Tags: , |

Abstract Designing high-performance palladium (Pd) supports with enhanced ethanol oxidation reaction (EOR) activity has consistently been a challenge. Here, a novel anatase titanium dioxide nanosheets-black phosphorus (ATN-BP) hybrid is fabricated as a support for Pd nanoparticles used in the EOR. The direct ball-milling of BP nanoflakes and ATN under argon protection lead to the formation of ATN-BP hybrids with BP nanoflakes interconnected by cataclastic ATN with POTi bonds. The structure of ATN-BP not only is beneficial for improving the electrolyte penetration and electron transportation but also has a strong influence on the stripping of reactive intermediates through the synergistic interaction between Pd and ATN-BP. The results demonstrate that the Pd/ATN-BP hybrids with heterointerfaces of Pd, BP, and ATN exhibit ultrahigh electroactivity and durability. In the EOR, the Pd/ATN-BP catalyst can achieve an electrochemically active surface area of ≈462.1 m2 gPd−1 and a mass peak current density of 5023.8 mA mgPd−1, which are 11.67 and 6.87 times greater, respectively, than those of commercial Pd/C. The Pd/ATN-BP catalysts also show remarkable stability with a retention rate of the peak current density of ≈30.6% after a durability test of 3600 s. Ultrahigh-performance ethanol electrooxidation: The combination of anatase titanium dioxide nanosheets (ATN) with black phosphorus (BP) is used to support palladium (Pd) nanoparticles. The Pd/ATN-BP catalyst exhibits super high electrochemical active surface area (462.1 m2 gPd−1) and mass peak current density (5023.8 mA mgPd−1) for ethanol electrooxidation, which are 11.67 and 6.87 times higher, respectively, than those of commercial Pd/Carbon.

Published in: "Advanced Energy Materials".

Chemical modification improves biocompatibility of black phosphorus nanosheets

2017-09-11T20:25:52+00:00 September 11th, 2017|Categories: Publications|Tags: , |

Black phosphorus nanosheets (BPs) have exhibited great potential for various applications including biomedicine, thus their potential side effects and corresponding improvement strategy deserve investigation. Here, in vitro and in vivo biological effects of BPs with and without titanium sulfonate ligand (TiL4) modification are investigated. Comparing to bare BPs, BPs with TiL4 modification ([email protected]) can efficiently escape from macrophages uptake, and reduce the cytotoxicity and proinflammation. When intravenously injected into mice, bare BPs trigger significant inflammatory responses, including an increase in peripheral neutrophils accompanied by elevation of a group of inflammatory cytokines, while [email protected] exhibit no such adverse immune responses. The corresponding mechanisms are also discussed. These findings may not only guide the applications of BPs, but also propose an efficient strategy to further improve the biocompatibility of BPs.

Published in: "Angewandte Chemie International Edition".

PREPARATION METHOD FOR GRAPHENE/TITANIUM DIOXIDE HOLLOW SPHERE/SULPHUR COMPOSITE MATERIAL

2017-08-29T19:56:49+00:00 August 29th, 2017|Categories: Patents|Tags: , |

Provided is a preparation method for a graphene/titanium dioxide hollow sphere/sulphur composite material, comprising the following steps: (1) adding graphene to an aqueous solution and implementing ultrasonic dispersion to form a suspension; (2) adding titanium sulphate and ammonium chloride to the suspension in turn and mixing uniformly, adding same to a hydrothermal kettle to implement a hydrothermal reaction, and after completion of the reaction, cooling naturally, filtering, washing with water, washing with ethanol, and drying to obtain a hollow titanium dioxide graphene composite material; and (3) adding the hollow titanium dioxide graphene composite material and elemental sulphur to carbon disulphide, implementing ultrasonic dispersion to form a suspension, and then evaporating the solvent to obtain a graphene/titanium dioxide hollow sphere/sulphur composite material. The titanium dioxide hollow spheres in the graphene/titanium dioxide hollow sphere/sulphur composite material are covered with a sulphur base material, and can inhibit the dissolution of polysulphides from the discharge product and mitigate volume expansion, improving electrochemical performance.

Published in: "Patentscope".

Achieving High Energy Li-ion Capacitors with Two Dimensional TiSe0.6S1.4 as Insertion Host

2017-08-29T11:17:57+00:00 August 29th, 2017|Categories: Publications|Tags: , |

J. Mater. Chem. A, 2017, Accepted ManuscriptDOI: 10.1039/C7TA04470D, PaperApoorva Chaturvedi, Peng Hu, Christian Kloc, Yun-Sung Lee, Vanchiappan Aravindan, Madhavi SrinivasanRemarkable improvement in the energy density is noted for Se substituted two dimensional TiS2 (TiSe0.6S1.4) as insertion matrix in Li-ion capacitor (LIC) assembly with

Published in: "Journal of Materials Chemistry A".

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