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Advanced Materials

Lu Chen, Jun Liu, Chao Jiang, Kunpeng Zhao, Hongyi Chen, Xun Shi, Lidong Chen, Chenghua Sun, Shengbai Zhang, Yong Wang, Ze Zhang
Phase transition is a fundamental physical phenomenon that has been widely studied both theoretically and experimentally. According to the Landau theory, the coexistence of high- and low-temperature phases is thermodynamically impossible during a second-order phase transition in a bulk single crystal. Here, the coexistence of two (α and β) phases in wedge-shaped nanosized single-crystal Cu2 Se over a large temperature range are demonstrated. By considering the surface free-energy difference between the two phases and the shape effect, a thermodynamic model is established, which explicitly explains their coexistence...
November 13, 2018: Advanced Materials
Asif Mahmood, Shuai Li, Zeeshan Ali, Hassina Tabassum, Bingjun Zhu, Zibin Liang, Wei Meng, Waseem Aftab, Wenhan Guo, Hao Zhang, Muhammad Yousaf, Song Gao, Ruqiang Zou, Yusheng Zhao
The large-scale application of sodium/potassium-ion batteries is severely limited by the low and slow charge storage dynamics of electrode materials. The crystalline carbons exhibit poor insertion capability of large Na+ /K+ ions, which limits the storage capability of Na/K batteries. Herein, porous S and N co-doped thin carbon (S/N@C) with shell-like (shell size ≈20-30 nm, shell wall ≈8-10 nm) morphology for enhanced Na+ /K+ storage is presented. Thanks to the hollow structure and thin shell-wall, S/N@C exhibits an excellent Na+ /K+ storage capability with fast mass transport at higher current densities, leading to limited compromise over charge storage at high charge/discharge rates...
November 13, 2018: Advanced Materials
Yingying Jiang, Jinyang Chen, Yunlong Sun, Qingyuan Li, Zhengxu Cai, Junyu Li, Yunlong Guo, Wenping Hu, Yunqi Liu
Fast deposition of aligning ambipolar polymers for high-performance organic field-effect transistors (OFETs) and inverter circuits are highly desired for both scientific studies and industry applications. Here, large-area and ordered polymer films are prepared by a bar-coating method at a rate of 120 mm s-1 in air. Atomic force microscopy and grazing-incidence wide-angle X-ray scattering analysis indicate uniform edge-on poly(fluoroisoindigo-difluorobithiophene-fluoroisoindigo-bithiophene) (PFIBI-BT) in 11...
November 12, 2018: Advanced Materials
Qundong Fu, Chao Zhu, Xiaoxu Zhao, Xingli Wang, Apoorva Chaturvedi, Chao Zhu, Xiaowei Wang, Qingsheng Zeng, Jiadong Zhou, Fucai Liu, Beng Kang Tay, Hua Zhang, Stephen J Pennycook, Zheng Liu
2D materials are considered as intriguing building blocks for next-generation optoelectronic devices. However, their photoresponse performance still needs to be improved for practical applications. Here, ultrasensitive 2D phototransistors are reported employing chemical vapor deposition (CVD)-grown 2D Bi2 O2 Se transferred onto silicon substrates with a noncorrosive transfer method. The as-transferred Bi2 O2 Se preserves high quality in contrast to the serious quality degradation in hydrofluoric-acid-assisted transfer...
November 12, 2018: Advanced Materials
Jung-Gu Han, Koeun Kim, Yongwon Lee, Nam-Soon Choi
In conjunction with electrolyte additives used for tuning the interfacial structures of electrodes, functional materials that eliminate or deactivate reactive substances generated by the degradation of LiPF6 -containing electrolytes in lithium-ion batteries offer a wide range of electrolyte formulation opportunities. Herein, the recent advancements in the development of: (i) scavengers with high selectivity and affinity toward unwanted species and (ii) promoters of ion-paired LiPF6 dissociation are highlighted, showing that the utilization of the above additives can effectively mitigate the problem of electrolyte instability that commonly results in battery performance degradation and lifetime shortening...
November 12, 2018: Advanced Materials
Bei Yang, Shaoqing Zhang, Sunsun Li, Huifeng Yao, Wanning Li, Jianhui Hou
Herein, poly(vinylpyrrolidone) (PVP) is used as the cathode interlayer (CIL) through the self-organization method in inverted organic solar cells (OSCs). By coating a solution of PVP and active layer materials onto a glass/indium tin oxide (ITO) substrate, the PVP can segregate to the near ITO side due to its high surface energy and strong intermolecular interaction with the ITO electrode. The power conversion efficiency (PCE) of the obtained OSC device reaches 13.3%, much higher than that of the control device with a PCE of only 10...
November 12, 2018: Advanced Materials
Thanh Loc Nguyen, Youngjin Choi, Jaeyun Kim
Immunotherapy has been recognized for decades as a promising therapeutic method for cancer treatment. To enhance host immune responses against cancer, antigen-presenting cells (APCs; e.g., dendritic cells) or T cells are educated using immunomodulatory agents including tumor-associated antigens and adjuvants, and manipulated to induce a cascading adaptive immune response targeting tumor cells. Mesoporous silica materials are promising candidates to improve cancer immunotherapy based on their attractive properties that include high porosity, high biocompatibility, facile surface modification, and self-adjuvanticity...
November 12, 2018: Advanced Materials
Owies M Wani, Rob Verpaalen, Hao Zeng, Arri Priimagi, Albert P H J Schenning
Beyond their colorful appearances and versatile geometries, flowers can self-shape-morph by adapting to environmental changes. Such responses are often regulated by a delicate interplay between different stimuli such as temperature, light, and humidity, giving rise to the beauty and complexity of the plant kingdom. Nature inspires scientists to realize artificial systems that mimic their natural counterparts in function, flexibility, and adaptation. Yet, many of the artificial systems demonstrated to date fail to mimic the adaptive functions, due to the lack of multi-responsivity and sophisticated control over deformation directionality...
November 12, 2018: Advanced Materials
Florian Geyer, Maria D'Acunzi, Ching-Yu Yang, Michael Müller, Philipp Baumli, Anke Kaltbeitzel, Volker Mailänder, Noemí Encinas, Doris Vollmer, Hans-Jürgen Butt
Fouling of thin tubes is a major problem, leading to various infections and associated morbidities, while cleaning is difficult or even impossible. Here, a generic method is introduced to activate and coat the inside of meter-long and at the same time thin (down to 1 mm) tubes with a super-liquid-repellent layer of nanofilaments, exhibiting even antibacterial properties. Activation is facilitated by pumping an oxidative Fenton solution through the tubes. Subsequent pumping of a silane solution renders the surface of the tubes super-liquid-repellent...
November 12, 2018: Advanced Materials
Brian R Donovan, Valentina M Matavulj, Suk-Kyun Ahn, Tyler Guin, Timothy J White
Photoresponsive liquid crystal elastomers (LCEs) are a unique class of anisotropic materials capable of undergoing large-scale, macroscopic deformations when exposed to light. Here, surface-aligned, azobenzene-functionalized LCEs are prepared via a radical-mediated, thiol-acrylate chain transfer reaction. A long-lived, macroscopic shape deformation is realized in an LCE composed with an o-fluorinated azobenzene (oF-azo) monomer. Under UV irradiation, the oF-azo LCE exhibits a persistent shape deformation for >72 h...
November 12, 2018: Advanced Materials
Xihu Wu, Abhijith Surendran, Jieun Ko, Oliver Filonik, Eva M Herzig, Peter Müller-Buschbaum, Wei Lin Leong
Organic electrochemical transistors (OECTs) are highly attractive for applications ranging from circuit elements and neuromorphic devices to transducers for biological sensing, and the archetypal channel material is poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS. The operation of OECTs involves the doping and dedoping of a conjugated polymer due to ion intercalation under the application of a gate voltage. However, the challenge is the trade-off in morphology for mixed conduction since good electronic charge transport requires a high degree of ordering among PEDOT chains, while efficient ion uptake and volumetric doping necessitates open and loose packing of the polymer chains...
November 12, 2018: Advanced Materials
Jianping Lai, Bolong Huang, Yuguang Chao, Xu Chen, Shaojun Guo
Designing non-precious-metal catalysts with comparable mass activity to state-of-the-art noble-metal catalysts for the hydrogen evolution reaction (HER) in alkaline solution still remains a significant challenge. Herein a new strongly coupled nickel-cobalt nitrides/carbon complex nanocage (NiCoNzocage) is rationally designed via chemical etching of ZIF-67 nanocubes with Ni(NO3 )2 under sonication at room temperature, following nitridation. The as-prepared strongly coupled NiCoN/C nanocages exhibit a mass activity of 0...
November 12, 2018: Advanced Materials
Do Yoon Kim, Sunglok Choi, Hyesung Cho, Jeong-Yun Sun
Color, as perceived through the eye, transcends mere information in the visible range of electromagnetism and serves as an agent for communication and entertainment. Mechanochromic systems have thus far only aimed at satisfying the sense of vision and have overlooked the possibility of generating acoustic vibrations in concert with their visual color responses that would enable the simultaneous satisfaction of the auditory system. Transcending the boundaries of the two senses (i.e., sound and color), herein a strategy for their concurrent and synesthetic fulfillment is elucidated by electrically actuating an organogel photonic device, controlled by a single input signal...
November 12, 2018: Advanced Materials
Lianfeng Zhao, Kyung Min Lee, Kwangdong Roh, Saeed Uz Zaman Khan, Barry P Rand
Hybrid organic-inorganic perovskite semiconductors have shown potential to develop into a new generation of light-emitting diode (LED) technology. Herein, an important design principle for perovskite LEDs is elucidated regarding optimal perovskite thickness. Adopting a thin perovskite layer in the range of 35-40 nm is shown to be critical for both device efficiency and stability improvements. Maximum external quantum efficiencies (EQEs) of 17.6% for Cs0.2 FA0.8 PbI2.8 Br0.2 , 14.3% for CH3 NH3 PbI3 (MAPbI3 ), 10...
November 9, 2018: Advanced Materials
Joseph Finley, Chia-Hao Lee, Pinshane Y Huang, Luqiao Liu
Ferrimagnetic materials combine the advantages of the low magnetic moment of an antiferromagnet and the ease of realizing magnetic reading of a ferromagnet. Recently, it was demonstrated that compensated ferrimagnetic half metals can be realized in Heusler alloys, where high spin polarization, zero magnetic moment, and low magnetic damping can be achieved at the same time. In this work, by studying the spin-orbit torque induced switching in the Heusler alloy Mn2 Ru1- x Ga, it is found that efficient current-induced magnetic switching can be realized in a nearly compensated sample with strong perpendicular anisotropy and large film thickness...
November 9, 2018: Advanced Materials
Zhongxin Chen, Cuibo Liu, Xiaoxu Zhao, Huan Yan, Jing Li, Pin Lyu, Yonghua Du, Shibo Xi, Kai Chi, Xiao Chi, Haisen Xu, Xing Li, Wei Fu, Kai Leng, Stephen J Pennycook, Shuai Wang, Kian Ping Loh
Confined catalysis in a 2D system is of particular interest owing to the facet control of the catalysts and the anisotropic kinetics of reactants, which suppress side reactions and improve selectivity. Here, a 2D-confined system consisting of intercalated Pt nanosheets within few-layered graphene is demonstrated. The strong metal-substrate interaction between the Pt nanosheets and the graphene leads to the quasi-2D growth of Pt with a unique (100)/(111)/(100) faceted structure, thus providing excellent catalytic activity and selectivity toward one-carbon (C1) products for the glycerol oxidation reaction...
November 9, 2018: Advanced Materials
Jasmina Gacˇanin, Jana Hedrich, Stefanie Sieste, Gunnar Glaßer, Ingo Lieberwirth, Corinna Schilling, Stephan Fischer, Holger Barth, Bernd Knöll, Christopher V Synatschke, Tanja Weil
The synthesis of hybrid hydrogels by pH-controlled structural transition with exceptional rheological properties as cellular matrix is reported. "Depsi" peptide sequences are grafted onto a polypeptide backbone that undergo a pH-induced intramolecular O-N-acyl migration at physiological conditions affording peptide nanofibers (PNFs) as supramolecular gelators. The polypeptide-PNF hydrogels are mechanically remarkably robust. They reveal exciting thixotropic behavior with immediate in situ recovery after exposure to various high strains over long periods and self-repair of defects by instantaneous reassembly...
November 9, 2018: Advanced Materials
Efat Jokar, Cheng-Hsun Chien, Cheng-Min Tsai, Amir Fathi, Eric Wei-Guang Diau
The stability of a tin-based perovskite solar cell is a major challenge. Here, hybrid tin-based perovskite solar cells in a new series that incorporate a nonpolar organic cation, guanidinium (GA+ ), in varied proportions into the formamidinium (FA+ ) tin triiodide perovskite (FASnI3 ) crystal structure in the presence of 1% ethylenediammonium diiodide (EDAI2 ) as an additive, are reported. The device performance is optimized at a precursor ratio (GAI:FAI) of 20:80 to attain a power conversion efficiency (PCE) of 8...
November 9, 2018: Advanced Materials
Sang-Soo Chee, Dongpyo Seo, Hanggyu Kim, Hanbyeol Jang, Seungmin Lee, Seung Pil Moon, Kyu Hyoung Lee, Sung Wng Kim, Hyunyong Choi, Moon-Ho Ham
2D transition metal dichalcogenides (TMDCs) have emerged as promising candidates for post-silicon nanoelectronics owing to their unique and outstanding semiconducting properties. However, contact engineering for these materials to create high-performance devices while adapting for large-area fabrication is still in its nascent stages. In this study, graphene/Ag contacts are introduced into MoS2 devices, for which a graphene film synthesized by chemical vapor deposition (CVD) is inserted between a CVD-grown MoS2 film and a Ag electrode as an interfacial layer...
November 9, 2018: Advanced Materials
Fakun Wang, Ting Gao, Qi Zhang, Zhi-Yi Hu, Bao Jin, Liang Li, Xing Zhou, Huiqiao Li, Gustaaf Van Tendeloo, Tianyou Zhai
2D ternary systems provide another degree of freedom of tuning physical properties through stoichiometry variation. However, the controllable growth of 2D ternary materials remains a huge challenge that hinders their practical applications. Here, for the first time, by using a gallium/indium liquid alloy as the precursor, the synthesis of high-quality 2D ternary Ga2 In4 S9 flakes of only a few atomic layers thick (≈2.4 nm for the thinnest samples) through chemical vapor deposition is realized. Their UV-light-sensing applications are explored systematically...
November 9, 2018: Advanced Materials
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