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Article ; Online: Preparation of Single-Layer MoS(2x)Se2(1-x) and Mo(x)W(1-x)S2 Nanosheets with High-Concentration Metallic 1T Phase.

Small (Weinheim an der Bergstrasse, Germany)

2016 Volume 12, Issue 14, Page(s) 1866–1874

Abstract: ... nanosheets with ≈66% of metallic 1T phase, including MoS(2x)Se2(1-x) and Mo(x)W(1-x)S2 is achieved via ... electrochemical Li-intercalation and the exfoliation method. Thin film MoS(2x)Se2(1- x) nanosheets drop-cast ...

Abstract	The high-yield and scalable production of single-layer ternary transition metal dichalcogenide nanosheets with ≈66% of metallic 1T phase, including MoS(2x)Se2(1-x) and Mo(x)W(1-x)S2 is achieved via electrochemical Li-intercalation and the exfoliation method. Thin film MoS(2x)Se2(1- x) nanosheets drop-cast on a fluorine-doped tin oxide substrate are used as an efficient electrocatalyst on the counter electrode for the tri-iodide reduction in a dye-sensitized solar cell.
Language	English
Publishing date	2016-04-13
Publishing country	Germany
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ISSN	1613-6829
ISSN (online)	1613-6829
DOI	10.1002/smll.201600014
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Article ; Online: Performance of field-effect transistors based on Nb(x)W(1-x)S2 monolayers.

Feng, Li-ping / Jiang, Wan-zhen / Su, Jie / Zhou, Lian-qun / Liu, Zheng-tang

Nanoscale

2016 Volume 8, Issue 12, Page(s) 6507–6513

Abstract: ... performed and p-FETs based on Nb-doped WS2 (Nb(x)W(1-x)S2) monolayers as the active channel have been ... and monolayer Nb(x)W(1-x)S2 after Nb doping. ... FETs. The reduction of the Schottky barrier is ascribed to the hybridization between W 5d, Nb 4d and S ...

Abstract	The Schottky barrier has been detected in many field-effect transistors (FETs) based on transition metal dichalcogenide (TMD) semiconductors and has seriously affected the electronic properties of the devices. In order to decrease the Schottky barrier in WS2 FETs, novel Nb doping in WS2 monolayers has been performed and p-FETs based on Nb-doped WS2 (Nb(x)W(1-x)S2) monolayers as the active channel have been fabricated for the first time. The monolayer Nb0.15W0.85S2 p-FET has a drain current of 330 μA μm(-1), an impressive I(ON)/I(OFF) of 10(7), and a high effective hole mobility of ∼146 cm(2) V(-1) s(-1). The novel Nb doping in monolayer WS2 has eliminated the ambipolar behavior and reduced the Schottky barrier in WS2 FETs. The reduction of the Schottky barrier is ascribed to the hybridization between W 5d, Nb 4d and S 3p states near the EF and to the enhancement of the metallization of the contact between the Pd metal and monolayer Nb(x)W(1-x)S2 after Nb doping.
Language	English
Publishing date	2016-03-28
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2515664-0
ISSN	2040-3372 ; 2040-3364
ISSN (online)	2040-3372
ISSN	2040-3364
DOI	10.1039/c6nr00380j
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Article ; Online: Prediction of an arc-tunable Weyl Fermion metallic state in Mo(x)W(1-x)Te2.

Chang, Tay-Rong / Xu, Su-Yang / Chang, Guoqing / Lee, Chi-Cheng / Huang, Shin-Ming / Wang, BaoKai / Bian, Guang / Zheng, Hao / Sanchez, Daniel S / Belopolski, Ilya / Alidoust, Nasser / Neupane, Madhab / Bansil, Arun / Jeng, Horng-Tay / Lin, Hsin / Zahid Hasan, M

Nature communications

2016 Volume 7, Page(s) 10639

Abstract: ... Weyl state in Mo(x)W(1-x)Te2 where Weyl nodes are formed by touching points between metallic pockets ... in the layered compound Mo(x)W(1-x)Te2, where non-saturating magneto-resistance and pressure-driven ...

Abstract	A Weyl semimetal is a new state of matter that hosts Weyl fermions as emergent quasiparticles. The Weyl fermions correspond to isolated points of bulk band degeneracy, Weyl nodes, which are connected only through the crystal's boundary by exotic Fermi arcs. The length of the Fermi arc gives a measure of the topological strength, because the only way to destroy the Weyl nodes is to annihilate them in pairs in the reciprocal space. To date, Weyl semimetals are only realized in the TaAs class. Here, we propose a tunable Weyl state in Mo(x)W(1-x)Te2 where Weyl nodes are formed by touching points between metallic pockets. We show that the Fermi arc length can be changed as a function of Mo concentration, thus tuning the topological strength. Our results provide an experimentally feasible route to realizing Weyl physics in the layered compound Mo(x)W(1-x)Te2, where non-saturating magneto-resistance and pressure-driven superconductivity have been observed.
Language	English
Publishing date	2016-02-15
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/ncomms10639
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Article ; Online: Photocatalytic degradation of methyl orange by PbXO4 (X=Mo, W).

Zhiyong, Yu / Chaonan, Dong / Ruiying, Qiu / Lijin, Xu / Aihua, Zheng

Journal of colloid and interface science

2015 Volume 438, Page(s) 323–331

Abstract: PbMoO4 and PbWO4 are prepared by the simple precipitation method in this work, they show the photocatalytic activities for the degradation of methyl orange in water under the UV light illumination. In the above photocatalytic degradation processes, ... ...

Abstract	PbMoO4 and PbWO4 are prepared by the simple precipitation method in this work, they show the photocatalytic activities for the degradation of methyl orange in water under the UV light illumination. In the above photocatalytic degradation processes, methyl orange concentration decreases quickly, the total organic carbon (TOC) decreases slowly; inorganic ions (SO4(2-), NO3(-), NO2(-), NH4(+)) can be formed and measured by the ion chromatograph; the pH value in the systems decreases gradually; a small quantity of HO˙(-)·can be generated and measured by the terephthalic acid (TA) indirectly. In order to estimate the roles of active species during the above photocatalytic degradation processes, isopropanol, (NH4)2C2O4, and 1,4-benzoquinone as the scavengers for HO˙, h(+), O2˙(-) are introduced into the systems, respectively. Isopropanol and (NH4)2C2O4 are effective scavengers for active species HO˙ and h(+) respectively, but 1,4-benzoquinone is not a satisfactory scavenger in all cases to capture O2˙(-), at least in this work. At last, PbMoO4 and PbWO4 are characterized by nitrogen sorption, DRS, SEM, TEM and XRD.
Language	English
Publishing date	2015-01-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	241597-5
ISSN	1095-7103 ; 0021-9797
ISSN (online)	1095-7103
ISSN	0021-9797
DOI	10.1016/j.jcis.2014.09.047
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Article ; Online: Properties at the interface of the pristine CdSe and core–shell CdSe-ZnS quantum dots with ultrathin monolayers of two-dimensional MX2 (M: Mo, W; X: S, Se, Te) heterostructures from density functional theory

Wang, Xin / Lichuanjushi / Chen, Yang / Zheng, Yan / Li, Laicai

J Mol Model 2022 July 13, v. 28, no. 8, p. 220

2022 , Page(s) 220

Abstract: In this work, eight van der Waals heterojunctions based on CdSe or CdSe-ZnS quantum dots (QDs) and four commonly used two-dimensional transition metal dichalcogenides (2D-TMDs) are theoretically designed. On the basis of the constructed structures, ... ...

Abstract	In this work, eight van der Waals heterojunctions based on CdSe or CdSe-ZnS quantum dots (QDs) and four commonly used two-dimensional transition metal dichalcogenides (2D-TMDs) are theoretically designed. On the basis of the constructed structures, density functional theory (DFT) method is employed to investigate the structural and optoelectronic related properties of these heterojunctions in detail. Specifically, their electronic properties including charge density differences, density of states, and band offsets are calculated, based on which band alignment types as well as their potentials as novel photovoltaic materials are discussed. According to these calculations, we proposed that several van der Waals heterostructures including MoS₂/CdSe, MoTe₂/CdSe, WSe₂/CdSe, MoTe₂/CdSe-ZnS, and WSe₂/CdSe-ZnS might be used as potential photovoltaic materials due to their type II band alignment characteristics. Moreover, the WSe₂/CdSe-ZnS heterostructure is expected to have optimal photovoltaic performance attributed to their large bond offsets and band gaps, which could not only facilitate charge separation processes, but also slow down charge recombination. Our present theoretical work could be helpful for the future experimental design of novel CdSe QDs and 2D-TMD based van der Waals heterostructures with excellent photovoltaic performances.
Keywords	density functional theory ; experimental design ; models ; van der Waals forces
Language	English
Dates of publication	2022-08
Size	p. 220
Publishing place	Springer Berlin Heidelberg
Document type	Article ; Online
ZDB-ID	1284729-X
ISSN	0948-5023 ; 1610-2940
ISSN (online)	0948-5023
ISSN	1610-2940
DOI	10.1007/s00894-022-05194-9
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Article ; Online: Intrinsic Thermal conductivities of monolayer transition metal dichalcogenides MX2 (M = Mo, W; X = S, Se, Te)

Muhammad Zulfiqar / Yinchang Zhao / Geng Li / ZhengCao Li / Jun Ni

Scientific Reports, Vol 9, Iss 1, Pp 1-

2019 Volume 7

Abstract: ... transition metal dichalcogenides MX2 (M = Mo, W; X = S, Se, Te) by combining the first-principles ... from thermal conductivity point of view to design the 2D transition metal dichalcogenides MX2 (M = Mo, W; X = S, Se, Te ...

Abstract	Abstract The successful synthesis of the single to few layer transition metal dichalcogenides has opened a new era in the nanoelectronics. For their efficient implementations in the electronic devices while taking care of their overheating issues, the characterization of their thermal transport properties is extremely vital. So, we have systematically investigated the thermal transport properties of monolayer transition metal dichalcogenides MX2 (M = Mo, W; X = S, Se, Te) by combining the first-principles calculations with Boltzmann transport equation. We find that monolayer WTe2 possesses the lowest lattice thermal conductivity κ L (33:66 Wm−1K−1 at 300 K) among these six semiconducting materials, in contrast to the highest κ L (113:97 Wm−1K−1 at 300 K) of WS2 among them. Further analyses reveal that the higher (lower) anharmonic and isotopic scatterings together with the lower (higher) phonon group velocities lead to the lowest (highest) value of κ L in WTe2 (WS2) monolayer. In addition, we have also calculated the cumulative thermal conductivity κ C as a function of mean free path, which indicates that the nanostructures with the length of about 400 nm would reduce κ L drastically. These results offer important understanding from thermal conductivity point of view to design the 2D transition metal dichalcogenides MX2 (M = Mo, W; X = S, Se, Te) electronics.
Keywords	Medicine ; R ; Science ; Q
Language	English
Publishing date	2019-03-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: NH3-SCR over V–W/TiO2 Investigated by Operando X-ray Absorption and Emission Spectroscopy

Doronkin, Dmitry E / Amidani, Lucia / Benzi, Federico / Casapu, Maria / Deutschmann, Olaf / Grunwaldt, Jan-Dierk / Roesky, Peter W / Sharapa, Dmitry I / Studt, Felix / Zheng, Lei

Journal of physical chemistry. 2019 May 24, v. 123, no. 23

2019

Abstract: ... an operando V K edge X-ray spectroscopic study on industrially relevant V–W/TiO2 catalysts so far. The V–W ... V–W/TiO2-based catalysts, which are used for the removal of NOx from the exhaust of diesel engines ... X-ray absorption spectroscopy (XAS) and emerging photon-in/photon-out techniques. In order to minimize ...

Abstract	V–W/TiO2-based catalysts, which are used for the removal of NOx from the exhaust of diesel engines and stationary sources via selective catalytic reduction with NH3 (NH3-SCR), were studied by operando X-ray absorption spectroscopy (XAS) and emerging photon-in/photon-out techniques. In order to minimize the influence of highly X-ray absorbing tungsten and the fluorescence of titanium, we used a high-energy-resolution fluorescence setup that is able to separate efficiently the V Kβ1,3 emission lines and additionally allows to record valence-to-core (vtc) X-ray emission lines. High-energy resolution fluorescence-detected XAS (HERFD-XAS) and vtc X-ray emission spectroscopy (vtc-XES) proved to be the only way to perform an operando V K edge X-ray spectroscopic study on industrially relevant V–W/TiO2 catalysts so far. The V–W/TiO2 and V/TiO2 samples synthesized by incipient wetness impregnation and grafting exhibited high activity toward NH3-SCR. Raman spectroscopy showed that they mainly contained highly dispersed, isolated, and polymeric V-oxo species. HERFD-XAS and XES identified redox cycling of vanadium species between V4+ and V5+. With respect to most of the potential NH3 adsorption complexes, density functional theory calculations further showed that vtc-XES is more limited than surface-sensitive techniques such as infrared spectroscopy; hence, a combination of X-ray techniques with IR or similar spectroscopies is required to unequivocally identify the mechanism of NH3-SCR over vanadia-based catalysts.
Keywords	adsorption ; ammonia ; catalysts ; density functional theory ; diesel engines ; fluorescence ; infrared spectroscopy ; nitrogen oxides ; polymers ; Raman spectroscopy ; spectral analysis ; titanium ; tungsten ; vanadium ; X-radiation ; X-ray absorption spectroscopy
Language	English
Dates of publication	2019-0524
Size	p. 14338-14349.
Publishing place	American Chemical Society
Document type	Article
ISSN	1932-7455
DOI	10.1021/acs.jpcc.9b00804
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Article ; Online: In vitro study on newly designed biodegradable Fe-X composites (X = W, CNT) prepared by spark plasma sintering.

Cheng, J / Zheng, Y F

Journal of biomedical materials research. Part B, Applied biomaterials

2013 Volume 101, Issue 4, Page(s) 485–497

Abstract: ... In this work, Fe-X (X= W, CNT) composites were prepared from powders of pure iron and the additive secondary ... phase X using the spark plasma sintering (SPS) method, aiming to obtain a higher corrosion rate and ... corrosion behaviors, and in vitro biocompatibility of these Fe-X composites were investigated. It was found ...

Abstract	Early in vivo animal test on pure iron coronary stent had proved that it is a promising candidate material as biodegradable metal, despite a faster degradation rate and uniform degradation mode is expected. In this work, Fe-X (X= W, CNT) composites were prepared from powders of pure iron and the additive secondary phase X using the spark plasma sintering (SPS) method, aiming to obtain a higher corrosion rate and a more uniform corrosion mode in physiological environment. The microstructures, mechanical properties, corrosion behaviors, and in vitro biocompatibility of these Fe-X composites were investigated. It was found that the additives were uniformly distributed in the iron matrix and relatively high dense Fe-X composite bulk samples were obtained after sintering by SPS. Both the yield strength and ultimate compressive strength increased when compared with that of as-cast pure iron. The corrosion mode of Fe-X composites turned out to be uniform corrosion instead of localized corrosion. Electrochemical measurements and immersion tests indicated that the addition of W and CNT could increase the corrosion rate of the iron matrix. From the results of cytotoxicity evaluation, it was found that all the Fe-X composites extracts induced no obvious cytotoxicity to L929 cells and ECV304 cells whereas significantly decreased cell viabilities of VSMC cells. The hemocompatibility tests showed that all the hemolysis percentage of Fe-X composites were less than 5%, and no sign of thrombogenicity was observed. It might be concluded that Fe composited with suitable second phase can exhibit higher strength, faster degradation rate, and uniform degradation mode than those of pure iron and are promising candidates for future development of new degradable metallic stents.
MeSH term(s)	Animals ; Biocompatible Materials/chemistry ; Cell Line ; Cell Survival ; Coronary Vessels/pathology ; Corrosion ; Electrochemistry ; Equipment Design ; Humans ; Iron/chemistry ; Materials Testing ; Mice ; Nanotubes, Carbon/chemistry ; Stents ; Stress, Mechanical ; Tungsten/chemistry
Chemical Substances	Biocompatible Materials ; Nanotubes, Carbon ; Iron (E1UOL152H7) ; Tungsten (V9306CXO6G)
Language	English
Publishing date	2013-01-29
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2099992-6
ISSN	1552-4981 ; 1552-4973 ; 0021-9304
ISSN (online)	1552-4981
ISSN	1552-4973 ; 0021-9304
DOI	10.1002/jbm.b.32783
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Article: Photocatalytic degradation of methyl orange by PbXO4 (X=Mo, W)

Zhiyong, Yu / Dong Chaonan / Qiu Ruiying / Xu Lijin / Zheng Aihua

Journal of colloid and interface science. 2015 Jan. 15, v. 438

2015

Abstract	PbMoO4 and PbWO4 are prepared by the simple precipitation method in this work, they show the photocatalytic activities for the degradation of methyl orange in water under the UV light illumination. In the above photocatalytic degradation processes, methyl orange concentration decreases quickly, the total organic carbon (TOC) decreases slowly; inorganic ions (SO42−, NO3−, NO2−, NH4+) can be formed and measured by the ion chromatograph; the pH value in the systems decreases gradually; a small quantity of HO−·can be generated and measured by the terephthalic acid (TA) indirectly. In order to estimate the roles of active species during the above photocatalytic degradation processes, isopropanol, (NH4)2C2O4, and 1,4-benzoquinone as the scavengers for HO, h+, O2− are introduced into the systems, respectively. Isopropanol and (NH4)2C2O4 are effective scavengers for active species HO and h+ respectively, but 1,4-benzoquinone is not a satisfactory scavenger in all cases to capture O2−, at least in this work. At last, PbMoO4 and PbWO4 are characterized by nitrogen sorption, DRS, SEM, TEM and XRD.
Keywords	ammonium ; benzoquinones ; chromatography ; inorganic ions ; isopropyl alcohol ; methyl orange ; nitrates ; nitrogen ; organic carbon ; pH ; photocatalysis ; scanning electron microscopy ; sorption ; sulfates ; superoxide anion ; transmission electron microscopy ; ultraviolet radiation ; X-ray diffraction
Language	English
Dates of publication	2015-0115
Size	p. 323-331.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	241597-5
ISSN	1095-7103 ; 0021-9797
ISSN (online)	1095-7103
ISSN	0021-9797
DOI	10.1016/j.jcis.2014.09.047
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Commentary on: Zhuo Y, Wang X, Wu J, Zhang S, Deng H, Liu W, et al. Simultaneous quantitative determination of amphetamines, opiates, ketamine, cocaine and metabolites in human hair: application to forensic cases of drug abuse. J Forensic Sci doi: 10.1111/1556-4029.14179. Epub 2019 Sep 9.

Hu, Jin / Zheng, Na / Liang, Man

Journal of forensic sciences

2019 Volume 65, Issue 2, Page(s) 664

MeSH term(s)	Amphetamines ; Cocaine ; Humans ; Ketamine ; Opiate Alkaloids ; Substance-Related Disorders
Chemical Substances	Amphetamines ; Opiate Alkaloids ; Ketamine (690G0D6V8H) ; Cocaine (I5Y540LHVR)
Language	English
Publishing date	2019-10-25
Publishing country	United States
Document type	Letter ; Comment
ZDB-ID	219216-0
ISSN	1556-4029 ; 0022-1198
ISSN (online)	1556-4029
ISSN	0022-1198
DOI	10.1111/1556-4029.14225
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