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Advanced Materials

Bin Liu, Yun Wang, Hui-Qing Peng, Ruoou Yang, Zheng Jiang, Xingtai Zhou, Chun-Sing Lee, Huijun Zhao, Wenjun Zhang
Exploring of new catalyst activation principle holds a key to unlock catalytic powers of cheap and earth-abundant materials for large-scale applications. In this regard, the vacancy defects have been proven to be effective to initiate catalytic active sites and endow high electrocatalytic activities. However, such electrocatalytically active defects reported to date have been mostly formed by anion vacancies. Herein, it is demonstrated for the first time that iron cation vacancies induce superb water splitting bifunctionality in alkaline media...
July 18, 2018: Advanced Materials
Der-Hsien Lien, Zhenghong Dong, Jose Ramon Duran Retamal, Hsin-Ping Wang, Tzu-Chiao Wei, Dan Wang, Jr-Hau He, Yi Cui
Optical resonance formed inside a nanocavity resonator can trap light within the active region and hence enhance light absorption, effectively boosting device or material performance in applications of solar cells, photodetectors (PDs), and photocatalysts. Complementing conventional circular and spherical structures, a new type of multishelled spherical resonant strategy is presented. Due to the resonance-enhanced absorption by multiple convex shells, ZnO nanoshell PDs show improved optoelectronic performance and omnidirectional detection of light at different incidence angles and polarization...
July 18, 2018: Advanced Materials
Xiaoyuan Ji, Na Kong, Junqing Wang, Wenliang Li, Yuling Xiao, Silvia Tian Gan, Ye Zhang, Yujing Li, Xiangrong Song, Qingqing Xiong, Sanjun Shi, Zhongjun Li, Wei Tao, Han Zhang, Lin Mei, Jinjun Shi
Single atom nonmetal 2D nanomaterials have shown considerable potential in cancer nanomedicines, owing to their intriguing properties and biocompatibility. Herein, ultrathin boron nanosheets (B NSs) are prepared through a novel top-down approach by coupling thermal oxidation etching and liquid exfoliation technologies, with controlled nanoscale thickness. Based on the PEGylated B NSs, a new photonic drug delivery platform is developed, which exhibits multiple promising features for cancer therapy and imaging, including: i) efficient NIR-light-to-heat conversion with a high photothermal conversion efficiency of 42...
July 18, 2018: Advanced Materials
Chao Gao, Benjamin P J Hasseldine, Ling Li, James C Weaver, Yaning Li
Protective armors are widespread in nature and often consist of periodic arrays of tile-like building blocks that articulate with each other through undulating interfaces. To investigate the mechanical consequences of these wavy tessellations, especially in instances where the amplitude of the undulations is near the scale of the constituent tiles as is found in the seedcoats of many plant species, an approach that integrates parametric modeling and finite element simulations with direct mechanical testing on their 3D-printed multi-material structural analogues is presented...
July 17, 2018: Advanced Materials
Fucong Fei, Xiangyan Bo, Pengdong Wang, Jianghua Ying, Jian Li, Ke Chen, Qing Dai, Bo Chen, Zhe Sun, Minhao Zhang, Fanming Qu, Yi Zhang, Qianghua Wang, Xuefeng Wang, Lu Cao, Haijun Bu, Fengqi Song, Xiangang Wan, Baigeng Wang
The discovery of a new type-II Dirac semimetal in Ir1- x Ptx Te2 with optimized band structure is described. Pt dopants protect the crystal structure holding the Dirac cones and tune the Fermi level close to the Dirac point. The type-II Dirac dispersion in Ir1- x Ptx Te2 is confirmed by angle-resolved photoemission spectroscopy and first-principles calculations. Superconductivity is also observed and persists when the Fermi level aligns with the Dirac points. Ir1- x Ptx Te2 is an ideal platform for further studies on the exotic properties and potential applications of type-II DSMs, and opens up a new route for the investigation of the possible topological superconductivity and Majorana physics...
July 17, 2018: Advanced Materials
Huilong Fei, Juncai Dong, Chengzhang Wan, Zipeng Zhao, Xiang Xu, Zhaoyang Lin, Yiliu Wang, Haotian Liu, Ketao Zang, Jun Luo, Shenglong Zhao, Wei Hu, Wensheng Yan, Imran Shakir, Yu Huang, Xiangfeng Duan
Graphene-supported single atomic metals (G-SAMs) have recently attracted considerable research interest for their intriguing catalytic, electronic, and magnetic properties. The development of effective synthetic methodologies toward G-SAMs with monodispersed metal atoms is vital for exploring their fundamental properties and potential applications. A convenient, rapid, and general strategy to synthesize a series of monodispersed atomic transition metals (for example, Co, Ni, Cu) embedded in nitrogen-doped graphene by two-second microwave (MW) heating the mixture of amine-functionalized graphene oxide and metal salts is reported here...
July 17, 2018: Advanced Materials
Lili Cai, Alex Y Song, Wei Li, Po-Chun Hsu, Dingchang Lin, Peter B Catrysse, Yayuan Liu, Yucan Peng, Jun Chen, Hongxia Wang, Jinwei Xu, Ankun Yang, Shanhui Fan, Yi Cui
Outdoor heat stress poses a serious public health threat and curtails industrial labor supply and productivity, thus adversely impacting the wellness and economy of the entire society. With climate change, there will be more intense and frequent heat waves that further present a grand challenge for sustainability. However, an efficient and economical method that can provide localized outdoor cooling of the human body without intensive energy input is lacking. Here, a novel spectrally selective nanocomposite textile for radiative outdoor cooling using zinc oxide nanoparticle-embedded polyethylene is demonstrated...
July 17, 2018: Advanced Materials
Wen-Long Liu, Tao Liu, Mei-Zhen Zou, Wu-Yang Yu, Chu-Xin Li, Zu-Yang He, Ming-Kang Zhang, Miao-Deng Liu, Zi-Hao Li, Jun Feng, Xian-Zheng Zhang
Extreme hypoxia of tumors represents the most notable barrier against the advance of tumor treatments. Inspired by the biological nature of red blood cells (RBCs) as the primary oxygen supplier in mammals, an aggressive man-made RBC (AmmRBC) is created to combat the hypoxia-mediated resistance of tumors to photodynamic therapy (PDT). Specifically, the complex formed between hemoglobin and enzyme-mimicking polydopamine, and polydopamine-carried photosensitizer is encapsulated inside the biovesicle that is engineered from the recombined RBC membranes...
July 17, 2018: Advanced Materials
Francis Amalraj Susai, Hadar Sclar, Yuliya Shilina, Tirupathi Rao Penki, Ravikumar Raman, Satyanarayana Maddukuri, Sandipan Maiti, Ion C Halalay, Shalom Luski, Boris Markovsky, Doron Aurbach
Li-ion batteries (LIBs) today face the challenge of application in electrified vehicles (xEVs) which require increased energy density, improved abuse tolerance, prolonged life, and low cost. LIB technology can significantly advance through more realistic approaches such as: i) stable high-specific-energy cathodes based on Li1+ x Niy Coz Mnw O2 (NCM) compounds with either Ni-rich (x = 0, y → 1), or Li- and Mn-rich (0.1 < x < 0.2, w > 0.5) compositions, and ii) chemically active separators and binders that mitigate battery performance degradation...
July 17, 2018: Advanced Materials
Long Ren, Shuaishuai Sun, Gilberto Casillas-Garcia, Mitchell Nancarrow, Germanas Peleckis, Mirzat Turdy, Kunrong Du, Xun Xu, Weihua Li, Lei Jiang, Shi Xue Dou, Yi Du
Electrical communication between a biological system and outside equipment allows one to monitor and influence the state of the tissue and nervous networks. As the bridge, bioelectrodes should possess both electrical conductivity and adaptive mechanical properties matching the target soft biosystem, but this is still a big challenge. A family of liquid-metal-based magnetoactive slurries (LMMSs) formed by dispersing magnetic iron particles in a Ga-based liquid metal (LM) matrix is reported here. The mechanical properties, viscosity, and stiffness of such materials rapidly respond to the stimulus of an applied magnetic field...
July 17, 2018: Advanced Materials
Jincan Zhang, Yucheng Huang, Zhenjun Tan, Tianran Li, Yichi Zhang, Kaicheng Jia, Li Lin, Luzhao Sun, Xiwen Chen, Zhenzhu Li, Congwei Tan, Jinxia Zhang, Liming Zheng, Yue Wu, Bing Deng, Zhaolong Chen, Zhongfan Liu, Hailin Peng
Heterostructures based on graphene and other 2D atomic crystals exhibit fascinating properties and intriguing potential in flexible optoelectronics, where graphene films function as transparent electrodes and other building blocks are used as photoactive materials. However, large-scale production of such heterostructures with superior performance is still in early stages. Herein, for the first time, the preparation of a submeter-sized, vertically stacked heterojunction of lead iodide (PbI2 )/graphene on a flexible polyethylene terephthalate (PET) film by vapor deposition of PbI2 on graphene/PET substrate at a temperature lower than 200 °C is demonstrated...
July 17, 2018: Advanced Materials
Woong Huh, Seonghoon Jang, Jae Yoon Lee, Donghun Lee, Donghun Lee, Jung Min Lee, Hong-Gyu Park, Jong Chan Kim, Hu Young Jeong, Gunuk Wang, Chul-Ho Lee
The development of energy-efficient artificial synapses capable of manifoldly tuning synaptic activities can provide a significant breakthrough toward novel neuromorphic computing technology. Here, a new class of artificial synaptic architecture, a three-terminal device consisting of a vertically integrated monolithic tungsten oxide memristor, and a variable-barrier tungsten selenide/graphene Schottky diode, termed as a 'synaptic barrister,' are reported. The device can implement essential synaptic characteristics, such as short-term plasticity, long-term plasticity, and paired-pulse facilitation...
July 17, 2018: Advanced Materials
Bhagwati Prasad, Georg Pfanzelt, Evangelos Fillis-Tsirakis, Michael J Zachman, Lena F Kourkoutis, Jochen Mannhart
Solid-state heterostructures are the cornerstone of modern electronics. To enhance the functionality and performance of integrated circuits, the spectrum of materials used in the heterostructures is being expanded by an increasing number of compounds and elements of the periodic table. While the integration of liquids and solid-liquid interfaces into such systems would allow unique and advanced functional properties and would enable integrated nanoionic circuits, solid-state heterostructures that incorporate liquids have not been considered thus far...
July 17, 2018: Advanced Materials
Mattan Ze'ev Becker, Neta Shomrat, Yoed Tsur
Electric-field-assisted sintering of ceramic materials is under considerable attention during recent years. The current research is reviewed with a focus on mechanism research. Research of the mass transfer mechanisms in flash sintering (FS) is under debate during recent years. The research yields three main proposed mechanisms: nucleation due to movement of charged defects, Joule heating runaway, and electrochemical reactions. These are critically presented and discussed. Unlike FS, the mechanism of field-assisted sintering technologies (FAST) of ceramics is well agreed upon...
July 15, 2018: Advanced Materials
Matthew Li, Zhongwei Chen, Tianpin Wu, Jun Lu
While members of the Li-S battery research community are becoming more conscious of the practical testing parameters, the widespread commercialization of S-based batteries is still far from realization. Particularly, the metallic Li used as the anode poses potential safety and cycle stability concerns. Alternatively, other S-battery configurations without a Li anode, i.e., lithium-ion, Li2 S, or S batteries, do not suffer from the same safety concerns and can possibly serve as better methods to bring room-temperature S-based battery technologies to industry...
July 15, 2018: Advanced Materials
Qian Kang, Bei Yang, Ye Xu, Bowei Xu, Jianhui Hou
Currently, solution-processed MoOx anode interfacial layers (AILs) can only be fabricated by the spin-coating method in organic solar cells (OSCs), which severely limits their use in practical productions where large-area printing techniques are used. Herein, a facile method is demonstrated to prepare highly conductive MoOx (denoted EG:Mo) that can be processed by printing methods such as wire-bar and blade coatings. The EG:Mo films are prepared by depositing an aqueous solution containing ammonium heptamolybdate (VI) tetrahydrate (NMo) and ethylene glycol (EG) and annealing at 200 °C...
July 15, 2018: Advanced Materials
Le Yu, Xin Yao Yu, Xiong Wen David Lou
Hollow micro-/nanostructures have attracted tremendous interest owing to their intriguing structure-induced physicochemical properties and great potential for widespread applications. With the development of modern synthetic methodology and analytical instruments, a rapid structural/compositional evolution of hollow structures from simple to complex has occurred in recent decades. Here, an updated overview of research progress made in the synthesis of hollow structures is provided. After an introduction of definition and classification, achievements in synthetic approaches for these delicate hollow architectures are presented in detail...
July 15, 2018: Advanced Materials
Anesia D Auguste, Jeremy W Ward, James O Hardin, Benjamin A Kowalski, Tyler C Guin, J Daniel Berrigan, Timothy J White
Liquid crystalline elastomers (LCEs) are widely recognized for their exceptional promise as actuating materials. Here, the comparatively less celebrated but also compelling nonlinear response of these materials to mechanical load is examined. Prior examinations of planarly aligned LCEs exhibit unidirectional nonlinear deformation to mechanical loads. A methodology is presented to realize surface-templated homeotropic orientation in LCEs and omnidirectional nonlinearity in mechanical deformation. Inkjet printing of the homeotropic alignment surface localizes regions of homeotropic and planar orientation within a monolithic LCE element...
July 15, 2018: Advanced Materials
Yanhao Yu, Xudong Wang
Photo-electrochemistry is the major trajectory for directly transforming solar energy into chemical compounds. The performance of a photo-electrochemical (PEC) system is directly related to the interfacial electrical band energy landscape. Recently, piezotronics has stood out as a promising strategy for tuning interfacial energetics. It applies intrinsic or deformation-induced ionic displacements (ferroelectric and piezoelectric polarizations) to engineer the interfacial charge distribution, and thereby the band structures of PEC electrodes...
July 15, 2018: Advanced Materials
Yusung Jin, Dokyoung Kim, Hajung Roh, Sojeong Kim, Sazid Hussain, Jinyoung Kang, Chan-Gi Pack, Jun Ki Kim, Seung-Jae Myung, Erkki Ruoslahti, Michael J Sailor, Song Cheol Kim, Jinmyoung Joo
A nanoparticle system for systemic delivery of therapeutics is described, which incorporates a means of tracking the fate of the nanocarrier and its residual drug payload in vivo by photoluminescence (PL). Porous silicon nanoparticles (PSiNPs) containing the proapoptotic antimicrobial peptide payload, D [KLAKLAK]2 , are monitored by measurement of the intrinsic PL intensity and the PL lifetime of the nanoparticles. The PL lifetime of the PSiNPs is on the order of microseconds, substantially longer than the nanosecond lifetimes typically exhibited by conventional fluorescent tags or by autofluorescence from cells and tissues; thus, emission from the nanoparticles is readily discerned in the time-resolved PL spectrum...
July 13, 2018: Advanced Materials
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