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Mani Sakthivel, Ramaraj Sukanya, Shen-Ming Chen
The electronic conductivity and electrocatalytic activity of metal chalcogenides are normally enhanced by following the ideal strategies such as substitution/doping of heterogeneous atoms and hybridization of highly conductive carbon supportive materials. Here, a rare earth element (samarium) was substituted with MoSe2 by using the simple hydrothermal method. The lattice distortion due to the substitution of Sm3+ with MoSe2 was clearly observed by using HRTEM analysis. As a consequence, the prepared SmMoSe2 nanorod was encapsulated with graphene oxide sheets (GO) using ultrasonication process...
August 10, 2018: ACS Applied Materials & Interfaces
Kibret A Messalea, Benjamin J Carey, Azmira Jannat, Nitu Syed, Md Mohiuddin, Bao Yue Zhang, Ali Zavabeti, Taimur Ahmed, Nasir Mahmood, Enrico Della Gaspera, Khashayar Khoshmanesh, Kourosh Kalantar-Zadeh, Torben Daeneke
Atomically thin, semiconducting transition and post transition metal oxides are emerging as a promising category of materials for high-performance oxide optoelectronic applications. However, the wafer-scale synthesis of crystalline atomically thin samples has been a challenge, particularly for oxides that do not present layered crystal structures. Herein we use a facile, scalable method to synthesise ultrathin bismuth oxide nanosheets using a liquid metal facilitated synthesis approach. Monolayers of α-Bi2O3 featuring sub-nanometre thickness, high crystallinity and large lateral dimensions could be isolated from the liquid bismuth surface...
August 9, 2018: Nanoscale
Huajun Yang, Jiaxu Zhang, Min Luo, Wei Wang, Haiping Lin, Youyong Li, Dongsheng Li, Pingyun Feng, Tao Wu
Supertetrahedral oxychalcogenide Tn nanoclusters (NCs, n denotes the number of metal-chalcogen layers) integrate chemically distinct but ordered oxygen and chalcogen sites in zinc-blend-type "quantum dots". They therefore offer a new level of control over various properties of semiconducting materials. So far, few such structures are known, and the cluster size is also limited to only T4 with 20 metal sites. Herein, we report an unusual oxysulfide T5 nanocluster with 35 metal sites. It has unprecedented In-O@In-S "core-shell" nanostructure and is also the largest supertetrahedral oxychalcogenide NC...
August 8, 2018: Journal of the American Chemical Society
Sifei Zhuo, Yusuf Shi, Lingmei Liu, Renyuan Li, Le Shi, Dalaver H Anjum, Yu Han, Peng Wang
Hybrid nanostructures integrating electroactive materials with functional species, such as metal-organic frameworks, covalent organic frameworks, graphdiyne etc., are of significance for both fundamental research and energy conversion/storage applications. Here, hierarchical triple-layered nanotube arrays, which consist of hydrogen-substituted graphdiyne frameworks seamlessly sandwiched between an outer layer of nickel-cobalt co-doped molybdenum disulfide nanosheets and an inner layer of mixed cobalt sulfide and nickel sulfide (Co9 S8 /Ni3 S2 ), are directly fabricated on conductive carbon paper...
August 7, 2018: Nature Communications
Lili Xi, Shanshan Pan, Xin Li, Yonglin Xu, Jianyue Ni, Xin Sun, Jiong Yang, Jun Luo, Jinyang Xi, Wenhao Zhu, Xinran Li, Di Jiang, Richard Dronskowski, Xun Shi, G Jeffrey Snyder, Wenqing Zhang
High-throughput (HTP) material design is an emerging field and has been proved to be powerful in the prediction of novel functional materials. In this work, an HTP effort has been carried out for thermoelectric chalcogenides with diamond-like structures on the newly established Materials Informatics Platform (MIP). Specifically, the relaxation time is evaluated by a reliable yet efficient method, which greatly improves the accuracy of HTP electrical transport calculations. The Results show that all the compounds may have power factors over 10 μW/cm-K2 if fully optimized...
August 8, 2018: Journal of the American Chemical Society
Yan-Dong Guo, Hong-Bo Zhang, Hong-Li Zeng, Hai-Xia Da, Xiao-Hong Yan, Wen-Yue Liu, Xin-Yi Mou
Breaking the symmetry in the out-of-plane direction in two-dimensional materials to trigger distinctive electronic properties has long been predicted. Inspired by the recent progress in the experimental synthesis of a sandwiched S-Mo-Se structure (Janus SMoSe) at the monolayer limit [Zhang et al., ACS Nano, 2017, 11, 8192-8198], we investigate the transport and electronic structure of two-faced XMoY monolayers (X, Y = O, S, Se and Te) through first-principles calculations. It is found that all the monolayers are semiconductors except OMoTe, which is metallic...
August 6, 2018: Physical Chemistry Chemical Physics: PCCP
Shu-Fang Li, Xiao-Ming Jiang, Yu-Hang Fan, Bin-Wen Liu, Hui-Yi Zeng, Guo-Cong Guo
To circumvent the incompatibility between large nonlinear optical (NLO) efficiencies and high laser-induced damage thresholds (LIDTs) in mid-infrared NLO materials, a new strategy for designing materials with both excellent properties is proposed. This strategy involves narrowing the band gap for large NLO efficiencies and reducing the thermal effect for a high LIDT. To support these proposals, a series of isostructural chalcogenides with various tetrahedral center cations, Na2 Ga2 MQ6 (M = Ge, Sn; Q = S, Se), were synthesized and studied in detail...
July 14, 2018: Chemical Science
Jiaxu Zhang, Wei Wang, Chaozhuang Xue, Mufan Zhao, Dandan Hu, Jing Lv, Xiang Wang, Dongsheng Li, Tao Wu
Constructing a hybrid connection mode between cluster-based building blocks is of particular importance in the pursuit of fascinating framework structures. Reported here are two new metal chalcogenide imidazolate frameworks (SCIF-11 and SCIF-12) with a hybrid intercluster bridging mode and a unique interrupted topological structure. SCIF-11 has a typical dia topology with a T3-InS supertetrahedral cluster as the node and an imidazolate (IM) ligand as the linker, but it for the first time combines two kinds of intercluster connecting modes: T3-S-T3 and T3-IM-T3...
August 3, 2018: Inorganic Chemistry
Jianqiao He, Yangwu Guo, Wenjuan Huang, Xian Zhang, Jiyong Yao, Tianyou Zhai, Fuqiang Huang
A new chalcogenide Na2 ZnSnS4 has been successfully synthesized by using Na2 S2 as reactive flux. Na2 ZnSnS4 crystallizes in the tetragonal system with space group of I4̅. Its cell parameters are a = 6.4835(6) Å and c = 9.134(1) Å. The structure is a derivative of AgGaS2 , in which the Ag+ ions are replaced by Na+ ions and the Ga3+ ions are replaced by Zn2+ and Sn4+ ions. All three cations are in seriously distorted tetrahedral geometry with a distortion factor (η = c/ a) of 1.4. Optical measurements show that the Na2 ZnSnS4 powder sample has a large transparent range from 0...
August 3, 2018: Inorganic Chemistry
Atiyeh Zarifi, Birgit Stiller, Moritz Merklein, Yang Liu, Blair Morrison, Alvaro Casas-Bedoya, Guanghui Ren, Thach G Nguyen, Khu Vu, Duk-Yong Choi, Arnan Mitchell, Steven J Madden, Benjamin J Eggleton
Recent advances in design and fabrication of photonic-phononic waveguides have enabled stimulated Brillouin scattering in silicon-based platforms such as underetched silicon waveguides and hybrid waveguides. Due to the sophisticated design and, more importantly, high sensitivity of the Brillouin resonances to geometrical variations in micro- and nano-scale structures, it is necessary to have access to the localized opto-acoustic response along those waveguides to monitor their uniformity and maximize their interaction strength...
August 1, 2018: Optics Letters
Xinqi Chen, Jianping Yang, Tian Wu, Li Li, Wei Luo, Wan Jiang, Lianjun Wang
Nanostructured binary copper chalcogenides (NBCCs) have been the subject of extensive research as promising candidates in energy-related and biological applications due to their advantageous properties, environmental compatibility, and abundance. The remarkable properties of these materials is born out of the variable stoichiometry between the copper and chalcogens, as well as the structural versatility, with zero-dimension to three-dimension structures, which consequently improves their electrical, optical, and catalytic properties...
July 31, 2018: Nanoscale
Dechao Chen, Huayang Zhang, Yunguo Li, Yingping Pang, Zongyou Yin, Hongqi Sun, Lai-Chang Zhang, Shaobin Wang, Martin Saunders, Emily Barker, Guohua Jia
Quasi-1D cadmium chalcogenide quantum rods (QRs) are benchmark semiconductor materials that are combined with noble metals to constitute QR heterostructures for efficient photocatalysis. However, the high toxicity of cadmium and cost of noble metals are the main obstacles to their widespread use. Herein, a facile colloidal synthetic approach is reported that leads to the spontaneous formation of cadmium-free alloyed ZnSx Se1- x QRs from polydisperse ZnSe nanowires by alkylthiol etching. The obtained non-noble-metal ZnSx Se1- x QRs can not only be directly adopted as efficient photocatalysts for water oxidation, showing a striking oxygen evolution capability of 3000 µmol g-1 h-1 , but also be utilized to prepare QR-sensitized TiO2 photoanodes which present enhanced photo-electrochemical (PEC) activity...
July 30, 2018: Advanced Materials
Katherine A Mazzio, Shyamal K K Prasad, Ken Okamoto, Justin M Hodgkiss, Christine K Luscombe
The functionalization of II-VI nanocrystals with semiconducting polymers is of fundamental interest for light-weight, solution processed optoelectronics. The direct surface functionalization of nanocrystals is useful for facilitating charge transfer across the donor/acceptor interface, in addition to promoting good mixing properties and thereby helping prevent nanoparticle aggregation. In this work, we develop a new method for the direct attachment of semiconducting polymers to II-VI inorganic nanocrystals, where the polymer plays a dual role, acting as both the desired capping agent and a chalcogenide monomer during synthesis...
July 30, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yifan Nie, Adam T Barton, Rafik Addou, Yongping Zheng, Lee A Walsh, Sarah M Eichfeld, Ruoyu Yue, Christopher R Cormier, Chenxi Zhang, Qingxiao Wang, Chaoping Liang, Joshua A Robinson, Moon Kim, William Vandenberghe, Luigi Colombo, Pil-Ryung Cha, Robert M Wallace, Christopher L Hinkle, Kyeongjae Cho
Two-dimensional materials have shown great promise for implementation in next-generation devices. However, controlling the film thickness during epitaxial growth remains elusive and must be fully understood before wide scale industrial application. Currently, uncontrolled multilayer growth is frequently observed, and not only does this growth mode contradict theoretical expectations, but it also breaks the inversion symmetry of the bulk crystal. In this work, a multiscale theoretical investigation aided by experimental evidence is carried out to identify the mechanism of such an unconventional, yet widely observed multilayer growth in the epitaxy of layered materials...
July 27, 2018: Nanoscale
Shi'ang Li, Yan Zhang, Rongfeng Tang, Xiaomin Wang, Tong Zhang, Guoshun Jiang, Weifeng Liu, Changfei Zhu, Tao Chen
Sb2S3 is a new kind of photovoltaic material promising for practically applicable solar cells due to its suitable bandgap, earth abundant elemental storage and excellent stability. Here we report on an aqueous solution based approach for the synthesis of Sb2S3 films from easily accessible Sb2O3 as antimony source. In this reaction, 3-mercaptopropionic acid is applied as both solvent and sulfur precursor, aqueous ammonia is employed as solvent. By a simple annealing at as low as 270 oC, the spin coated precursor solution can generate compact, flat, uniform and well-crystallized Sb2S3 film...
July 26, 2018: ChemSusChem
Ki Kang Kim, Hyun Seok Lee, Young Hee Lee
Among two dimensional (2D) van der Waals (vdW) layered materials such as graphene, which is used like a metal, and transition metal chalcogenides (TMdCs), which are used as semiconductors and metals, hexagonal boron nitride (hBN), which is used as an insulator, is ubiquitous as a building block to construct 2D vdW electronics for versatile tunneling devices. Monolayer and few-layer hBN films have been prepared with flake sizes of a few hundred micrometer via mechanical exfoliation and transfer methods. Another approach used to synthesize hBN films on a large scale is chemical vapor deposition (CVD)...
July 25, 2018: Chemical Society Reviews
Pablo Martín-Ramos, Ignacio A Fernández-Coppel, Manuel Avella, Jesús Martín-Gil
Transition metal oxides and chalcogenides have recently attracted great attention as the next generation of 2-D materials due to their unique electronic and optical properties. In this study, a new procedure for the obtaining of highly crystalline α -MoO₃ is proposed as an alternative to vapor-phase synthesis. In this approach, a first reaction between molybdate, citrate and thiourea allowed to obtain MoS₂, which-upon calcination at a temperature of 650 °C in the presence of g-C₃N₄-resulted in MoO₃ with a definite plate-like shape...
July 22, 2018: Nanomaterials
Kai Sun, Shuaishuai Sun, Chunhui Zhu, Huanfang Tian, Huaixin Yang, Jianqi Li
The hidden (H) quantum state in 1T-TaS2 has sparked considerable interest in the field of correlated electron systems. Here, we investigate ultrafast switches to stable H charge density wave (H-CDW) states observed in 1T-TaS2- x Se x , with x = 0 and 0.5 crystals, upon excitation with a single femtosecond laser pulse. In situ cooling transmission electron microscopy observations, initiated by a single femtosecond laser pumping with a low fluence, reveal a clear transition from a commensurate CDW phase ( q C ) to a new CDW order with q H = (1 - δ) q C for the H-CDW state (δ = 1/9) accompanied by an evident phase separation...
July 2018: Science Advances
S Ahmadpour, M Rezvani, P Bavafa
Chalcogenide glasses are significant materials for semiconducting and infrared imaging because of their infrared (IR) transparency. In the present study, Se-Ge-As based chalcogenide glasses with chemical composition of (Se0.6 As0.1 Ge0.3 )100-x Snx doped with different amounts of Sn were prepared by conventional melting-quenching method. Physical properties of glasses were investigated by studying density and molar volume. Based on differential scanning calorimetry (DSC) results and density measurements, the binary role of Sn was proved...
July 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Deqiang Yin, Chaochao Dun, Xiang Gao, Yang Liu, Xian Zhang, David L Carroll, Mark T Swihart
A systematic colloidal synthesis approach to prepare tin(II, IV) chalcogenide nanocrystals with controllable valence and morphology is reported, and the preparation of solution-processed nanostructured thermoelectric thin films from them is then demonstrated. Triangular SnS nanoplates with a recently-reported π-cubic structure, SnSe with various shapes (nanostars and both rectangular and hexagonal nanoplates), SnTe nanorods, and previously reported Sn(IV) chalcogenides, are obtained using different combinations of solvents and ligands with an Sn4+ precursor...
July 20, 2018: Small
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