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Zhiyao Ma, Mengya Zhang, Jingyuan Guo, Wen Liu, Meiping Tong
ZrO2 modified BiOCl0.5 I0.5 composites (ZBCI), synthesized via a facile precipitation method at room temperature, were utilized to photocatalytically oxidize and adsorb arsenite from water under visible light irradiation. The composites were well characterized by using various techniques. With visible light irradiation, 5 mg L-1 of As(III) could be completely removed by ZBCI (0.25 g L-1 ) in 90 min. Particularly, we found that ZBCI composites not only could oxidize As(III) into As(V) with visible light irradiation, but also could effectively capture the generated As(V), leading to the negligible residual As(III) or As(V) in aqueous solutions after 90 min treatment...
August 2, 2018: Chemosphere
Yu Wang, Erfu Liu, Anyuan Gao, Tianjun Cao, Mingsheng Long, Chen Pan, Lili Zhang, Junwen Zeng, Chenyu Wang, Weida Hu, Shi-Jun Liang, Feng Miao
Van der Waals (vdW) heterostructures made of two-dimensional materials have been demonstrated to be versatile architectures for optoelectronic applications due to strong light-matter interactions. However, most of light-controlled phenomena and applications in the vdW heterostructures rely on positive photoconductance (PPC). Negative photoconductance (NPC) has not yet been reported in vdW heterostructures. Here we report the observation of the NPC in ReS2/h-BN/MoS2 vdW heterostructures-based floating gate phototransistor...
August 17, 2018: ACS Nano
Yee Sin Ang, Hui Ying Yang, L K Ang
We identify a new universality in the carrier transport of two-dimensional (2D) material-based Schottky heterostructures. We show that the reversed saturation current (J) scales universally with temperature (T) as log(J/T^{β})∝-1/T, with β=3/2 for lateral Schottky heterostructures and β=1 for vertical Schottky heterostructures, over a wide range of 2D systems including nonrelativistic electron gas, Rashba spintronic systems, single- and few-layer graphene, transition metal dichalcogenides, and thin films of topological solids...
August 3, 2018: Physical Review Letters
Chun-Hao Ma, Jie Jiang, Pao-Wen Shao, Qiangxiang Peng, Chun-Wei Huang, Ping-Chun Wu, Jyun-Ting Lee, Yu-Hong Lai, Din Ping Tsai, Jyh Ming Wu, Shen-Chuan Lo, Wen-Wei Wu, Yichun Zhou, Po-Wen Chiu, Ying-Hao Chu
In the era of Internet of Things, the demand for flexible and transparent electronic devices has shifted to the forefront of materials science research. However, the radiation damage to key performance of transparent devices under radiative environment remains as a critical issue. Here, we present a promising technology for nonvolatile transparent electronic devices based on flexible oxide heteroepitaxy. A direct fabrication of epitaxial lead lanthanum zirconate titanate on transparent flexible mica substrate with indium tin oxide electrodes is presented...
August 17, 2018: ACS Applied Materials & Interfaces
Huanyu Pei, Yunjie Zhang, Shujin Guo, Lixia Ren, Hong Yan, Bingcheng Luo, Chang-Le Chen, Kexin Jin
The optical magneto-electric effect has been widely investigated, but how to obtain the large and tunable optical magneto-electric effect at room temperature is still a big challenge. We here design ferroelectric/ferromagnetic hetero-structures with various orientations, which are composed of titanate BaTiO3 and manganese oxide La0.67 Sr0.33 MnO3 . This artificial bilayer structure presents room-temperature ferroelectric and ferromagnetic properties. After patterning a 4 μm grating structure on the bilayer thin film, the optical magneto-electric effect for near-infrared light is investigated systematically through the Bragg diffraction method...
August 17, 2018: ACS Applied Materials & Interfaces
Wei Li, Frank Jäckel
Semiconducting quantum dots (QDs) have been considered as promising building blocks of solar energy harvesting systems because of size-dependent electronic structures, e.g. QD-metal heterostructures for solar-driven H2 production. In order to design improved systems, it is crucial to understand size-dependent QD-metal interfacial electron transfer dynamics, picosecond processes in particular. Here, we report that the transfer rates of photogenerated electrons in Pt-decorated CdS QDs can be varied over more than two orders of magnitude by controlling the QD size...
August 17, 2018: Nanoscale
Antoni Rogalski, Małgorzata Kopytko, Piotr Martyniuk
Recently, an enhanced computer program was applied to explain in detail the influence of different recombination mechanisms (Auger, radiative, and Shockley-Read-Hall) on the performance of high-operation-temperature, long-wavelength, infrared p-i-n HgCdTe heterojunction photodiodes. It is shown that the photon recycling effect drastically limits the influence of radiative recombination on the performance of small pixel HgCdTe photodiodes. The computer program is based on a solution of the carrier transport equations, as well as the photon transport equations for semiconductor heterostructures...
June 20, 2018: Applied Optics
Ju Yeon Seo, Kyo-Jin Hwang, Sung-Il Baik, Su Ryeon Lee, Byungjin Cho, Euihyun Jo, Minseok Choi, Myung Gwan Hahm, Yoon-Jun Kim
Increased interest in two-dimensional (2-D) materials and heterostructures for use as components of electrical devices has led to the use of an atomically mixed phase between semiconducting and metallic transition metal dichalcogenides (TMDs) that exhibited enhanced interfacial characteristics. To understand the lattice structure and properties of 2-D materials on the atomic scale, diverse characterization methods such as Raman spectroscopy, high-resolution transmission electron microscopy, and X-ray photoemission spectroscopy have been applied...
August 17, 2018: ACS Applied Materials & Interfaces
H S Qiu, K Kato, K Hirota, N Sarukura, M Yoshimura, M Nakajima
The emission with a bandwidth of 1.5 terahertz based on the spin current in the ferromagnetic heterostructure Co/Pt is demonstrated. The spin transient launched by the NIR femtosecond laser pulse in the Co/Pt is converted into the in-plane charge current due to the inverse spin Hall effect, which gives rise to the terahertz emission towards free space. The dependence of the terahertz emission on the Pt-layer thickness is investigated. To optimize the geometry structure of the new type of emitter, we developed the theoretical model by carefully analyzing the spin transport...
June 11, 2018: Optics Express
Yiling Song, Cong Zhang, Weiwei Liu, Xiaohong Li, Hua Long, Kai Wang, Bing Wang, Peixiang Lu
Here, we report the energy transfer in (PEA)2 PbI4 /MAPbBr3 perovskite heterostructures. Under two-photon excitation, the photoluminescence (PL) emission of the (PEA)2 PbI4 flake is nearly completely quenched, while that of the MAPbBr3 microplate is greatly increased (6.5 folds higher) in the heterostructure. The opposite variation character of the PL emissions is attributed to the radiative energy transfer from the (PEA)2 PbI4 flake to the MAPbBr3 microplate. The radiative energy transfer occurs on an ultrafast timescale with a high efficiency (~100%)...
July 9, 2018: Optics Express
Esther M Frederick, José David Cojal González, Jürgen P Rabe, Steven L Bernasek
Physisorbed self-assembled monolayers (SAMs) have been suggested as potential models for 3D crystallization. This work studies the effect of altering the chain length of 5-alkoxyisophthalic acid (CnISA) on self-assembled morphology in both 2D and 3D in order to explore the extent comparisons can be drawn between dimensions. Previous studies of 5-alkoxyisophthalic acid at solid-liquid interfaces (2D) reported different morphologies for C5ISA and C6ISA-alkoxy chains on the one hand and C10ISA and C18ISA on the other...
August 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Mengmeng Guan, Lei Wang, Shishun Zhao, Ziyao Zhou, Guohua Dong, Wei Su, Tai Min, Jing Ma, Zhongqiang Hu, Wei Ren, Zuo-Guang Ye, Ce-Wen Nan, Ming Liu
The voltage modulation of yttrium iron garnet (YIG) is of practical and theoretical significance; due to its advantages of compactness, high-speed response, and energy efficiency, it can be used for various spintronic applications, including spin-Hall, spin-pumping, and spin-Seebeck effects. In this study, a significant ferromagnetic resonance change is achieved within the YIG/Pt bilayer heterostructures uisng ionic modulation, which is accomplished by modifying the interfacial magnetism in the deposited "capping" platinum layer...
August 14, 2018: Advanced Materials
Nailiang Yang, Hongfei Cheng, Xiaozhi Liu, Qinbai Yun, Ye Chen, Bing Li, Bo Chen, Zhicheng Zhang, Xiaoping Chen, Qipeng Lu, Jingtao Huang, Ying Huang, Yun Zong, Yanhui Yang, Lin Gu, Hua Zhang
Similar to heterostructures composed of different materials, possessing unique properties due to the synergistic effect between different components, the crystal-phase heterostructures, one variety of hetero-phase structures, composed of different crystal phases in monometallic nanomaterials are herein developed, in order to explore crystal-phase-based applications. As novel hetero-phase structures, amorphous/crystalline heterostructures are highly desired, since they often exhibit unique properties, and hold promise in various applications, but these structures have rarely been studied in noble metals...
August 14, 2018: Advanced Materials
Wenhan Zhou, Xuhai Liu, Xuemin Hu, Shengli Zhang, Chunyi Zhi, Bo Cai, Shiying Guo, Xiufeng Song, Zhi Li, Haibo Zeng
Identifying heterostructures with tunable band alignments remains a difficult challenge. Here, based on bond-orbital theory, we propose a series of new BN/BX (X = P, As, Sb) lateral heterostructures (LHS). Our first principles calculations reveal that the LHS interlines have a substantial impact on the electronic properties. Importantly, we start with the chemical concepts, such as bond length and strength as well as orbital overlap interaction, in an attempt to thoroughly investigate the electronic properties, namely the band offset, the band gap (Eg) and the state of the energy level...
August 15, 2018: Nanoscale
Qiang Zhang, Jin Yu, Philipp Ebert, Chendong Zhang, Chi-Ruei Pan, Mei-Yin Chou, Chih-Kang Shih, Changgan Zeng, Shengjun Yuan
The moiré pattern formed between a two-dimensional (2D) material and the substrate has played a crucial role in tuning the electronic structure of the 2D material. Here, by using scanning tunneling microscopy and spectroscopy (STM/S), we found a moiré-pattern-dependent band gap and work function modulation in hBN/Cu(111) heterostructures, whose amplitudes increase with the moiré pattern wavelength. Moreover, the work function modulation shifts agree well with the conduction band (CB) edge shifts, indicating a spatially constant electron affinity for the hBN layer...
August 14, 2018: ACS Nano
Jiabin Guo, Qichong Zhang, Qiulong Li, Juan Sun, Chaowei Li, Bing He, Zhenyu Zhou, Liyan Xie, Ming-Xing Li, Yagang Yao
Extensive progress has been made in fiber-shaped asymmetric supercapacitors (FASCs) for portable and wearable electronics. However, positive and negative electrodes must be distinguished and low energy densities are crucial challenge and thus limit their practical applications. This paper reports an efficient method to directly grow TiN nanowire arrays@V2O5 nanosheets core-shell heterostructures on carbon nanotube fibers as non-polarity electrodes. Benefiting from their unique heterostructure, single electrodes possess high specific capacitances of 195...
August 14, 2018: ACS Applied Materials & Interfaces
Jongsik Park, Jisol Park, Jaeyoung Lee, Aram Oh, Hionsuck Baik, Kwangyeol Lee
Post-synthetic transformation of nanoparticles has received great attention, because this approach can provide an unusual route to elaborately composition-controlled nanostructures while maintaining the overall structure of the template. In principle, anisotropic hetero-nanoparticles of semiconductor materials can be synthesized via localized, i.e., single site, cation exchange in symmetric nanoparticles. However, the differentiation of multiple identical cation exchange sites in symmetric nanoparticles can be difficult to achieve, especially for semiconductor systems with very fast cation exchange kinetics...
August 14, 2018: ACS Nano
Lu Chen, Huijuan Huang, Yuanhui Zheng, Wenhao Sun, Yi Zhao, Paul S Francis, Xuxu Wang
The majority of visible-light photocatalysts show very low hydrogen evolution activity in the absence of noble metal co-catalysts due to their fast carrier recombination rate. Metallic interstitial nitrides have been recognized as excellent hydrogen evolution electrocatalysts and therefore are promising alternative co-catalysts for photocatalytic hydrogen production. Herein we report a low-cost, efficient, noble-metal-free visible-light-driven hydrogen evolution photocatalyst composed of Ni3N/g-C3N4 heterostructures...
August 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yudhajit Bhattacharjee, Dipanwita Chatterjee, Suryasarathi Bose
Herein, we report high electromagnetic interference (EMI) shielding effectiveness of -40 dB in the Ku- band (for a 600 µm thick film) through unique core-shell hetereostructure consisting of a ferritic core (Fe3O4) and a conducting shell (multiwalled carbon nanotubes, MWCNT) supported onto a dielectric spacer (here SiO2). In recent times, materials with good flexibility, heat dissipating ability and sustainability together with efficient EMI shielding at minimal thickness is highly desirable; especially if they can be easily processed into thin films...
August 14, 2018: ACS Applied Materials & Interfaces
Adeline Adam, Mélanie Poggi, Eric Larquet, Robert Cortès, Lucio Martinelli, Pierre-Eugène Coulon, Eric Lahera, Olivier Proux, Dmitry Chernyshov, Kamel Boukheddaden, Thierry Gacoin, Isabelle Maurin
Heterostructures based on Prussian blue analogues (PBA) combining photo- and magneto-striction have shown a large potential for the development of light-induced magnetization switching. However, studies of the microscopic parameters that control the transfer of the mechanical stresses across the interface and their propagation in the magnetic material are still too scarce to efficiently improve the elastic coupling. Here, this coupling strength is tentatively controlled by strain engineering in heteroepitaxial PBA core-shell heterostructures involving the same Rb0...
August 14, 2018: Nanoscale
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