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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

Oleg Kovalenko, Christian Brandl, Leonid Klinger, Eugen Rabkin
Some metal alloys subjected to irreversible plastic deformation can repair the inflicted damage and/or recover their original shape upon heating. The conventional shape memory effect in metallic alloys relies on collective, or "military" phase transformations. This work demonstrates a new and fundamentally different type of self-healing and shape memory in single crystalline faceted nano and microparticles of pure gold, which are plastically deformed with an atomic force microscope tip. It is shown that annealing of the deformed particles at elevated temperatures leads to nearly full recovery of their initial asymmetric polyhedral shape, which does not correspond to global energy minimum shape...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Saman Ghasimi, Simon A Bretschneider, Wei Huang, Katharina Landfester, Kai A I Zhang
The Stille coupling reaction is a versatile method to mainly form aromatic C-C bonds. However, up to now, the use of palladium catalysts is necessary. Here, a palladium-free and photocatalytic Stille-type coupling reaction of aryl iodides and aryl stannanes catalyzing a conjugated microporous polymer-based phototcatalyst under visible light irradiation at room temperature is reported. The novel coupling reaction mechanism occurs between the photogenerated aryl radical under oxidative destannylation of the aryl stannane, and the electron-activated aryl iodide, resulting into the aromatic C-C bond formation reaction...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Shuai Niu, Wen-Jie Jiang, Tang Tang, Yun Zhang, Ji-Hui Li, Jin-Song Hu
Developing highly efficient low-cost electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte is essential to advance water electrolysis technology. Herein, Ni(OH)2 nanoplates aligned on NiAl foil (Ni(OH)2/NiAl) are developed by simply dealloying NiAl foil in KOH, which exhibits high electrocatalytic activity for OER with a small overpotential of 289 mV to achieve 10 mA cm(-2) and outstanding durability with no detectable degradation during long-term operation...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Huidan Hou, Qingkai Xu, Yaokun Pang, Lei Li, Jiulin Wang, Chi Zhang, Chunwen Sun
Storing energy harvested by triboelectric nanogenerators (TENGs) from ambient mechanical motion is still a great challenge for achieving low-cost and environmental benign power sources. Here, an all-solid-state Na-ion battery with safe and durable performance used for efficient storing pulsed energy harvested by the TENG is demonstrated. The solid-state sodium-ion batteries are charged by galvanostatic mode and pulse mode with the TENG, respectively. The all-solid-state sodium-ion battery displays excellent cyclic performance up to 1000 cycles with a capacity retention of about 85% even at a high charge and discharge current density of 48 mA g(-1)...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Xiaohui Liu, Hai-Qiao Wang, Yaru Li, Zhenzhen Gui, Shuaiqiang Ming, Khurram Usman, Wenjun Zhang, Junfeng Fang
Landmark power conversion efficiency (PCE) over 10% has been accomplished in the past year for single-junction organic solar cell (OSCs), suggesting a promising potential application of this technology. However, most of the high efficient OSCs are based on inverted configuration. Regular structure OSCs with both high efficiency and good stability are still rarely reported to date. In this work, by utilizing a new designed ligand-free and non-thermal-annealing-treated Al-doped ZnO cathode interlayer, high efficiency and greatly improved stability are simultaneously realized in regular OSCs...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Si-Fen Yang, Zi-Tong Liu, Zheng-Xu Cai, Matthew J Dyson, Natalie Stingelin, Wei Chen, Hua-Jun Ju, Guan-Xin Zhang, De-Qing Zhang
Side chain engineering of conjugated donor-acceptor polymers is a new way to manipulate their optoelectronic properties. Two new diketopyrrolopyrrole (DPP)-terthiophene-based conjugated polymers PDPP3T-1 and PDPP3T-2, with both hydrophilic triethylene glycol (TEG) and hydrophobic alkyl chains, are reported. It is demonstrated that the incorporation of TEG chains has a significant effect on the interchain packing and thin-film morphology with noticeable effect on charge transport. Polymer chains of PDPP3T-1 in which TEG chains are uniformly distributed can self-assemble spontaneously into a more ordered thin film...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Lisha Fan, Xiang Gao, Dongkyu Lee, Er-Jia Guo, Shinbuhm Lee, Paul C Snijders, Thomas Z Ward, Gyula Eres, Matthew F Chisholm, Ho Nyung Lee
This study demonstrates that precise control of nonequilibrium growth conditions during pulsed laser deposition (PLD) can be exploited to produce single-crystalline anatase TiO2 nanobrush architectures with large surface areas terminated with high energy {001} facets. The data indicate that the key to nanobrush formation is controlling the atomic surface transport processes to balance defect aggregation and surface-smoothing processes. High-resolution scanning transmission electron microscopy data reveal that defect-mediated aggregation is the key to TiO2 nanobrush formation...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Jianming Zheng, Joshua A Lochala, Alexander Kwok, Zhiqun Daniel Deng, Jie Xiao
The electrolyte is an indispensable component in all electrochemical energy storage and conversion devices with batteries being a prime example. While most research efforts have been pursued on the materials side, the progress for the electrolyte is slow due to the decomposition of salts and solvents at low potentials, not to mention their complicated interactions with the electrode materials. The general properties of bulk electrolytes such as ionic conductivity, viscosity, and stability all affect the cell performance...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Jiangsheng Xie, Xuegong Yu, Jiabin Huang, Xuan Sun, Yunhai Zhang, Zhengrui Yang, Ming Lei, Lingbo Xu, Zeguo Tang, Can Cui, Peng Wang, Deren Yang
In this Communication, a self-organization method of [6,6]-phenyl-C61-butyric acid 2-((2-(dimethylamino)-ethyl) (methyl)amino)ethyl ester (PCBDAN) interlayer in between 6,6-phenyl C61-butyric acid methyl ester (PCBM) and indium tin oxide (ITO) has been proposed to improve the performance of N-I-P perovskite solar cells (PSCs). The introduction of self-organized PCBDAN interlayer can effectively reduce the work function of ITO and therefore eliminate the interface barrier between electron transport layer and electrode...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Wen Li, Fengning Guo, Haifeng Ling, Peng Zhang, Mingdong Yi, Laiyuan Wang, Dequn Wu, Linghai Xie, Wei Huang
Nonvolatile organic field-effect transistor (OFET) memory devices based on pentacene/N,N'-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (P13)/pentacene trilayer organic heterostructures have been proposed. The discontinuous n-type P13 embedded in p-type pentacene layers can not only provide electrons in the semiconductor layer that facilitates electron trapping process; it also works as charge trapping sites, which is attributed to the quantum well-like pentacene/P13/pentacene organic heterostructures...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Zheng Zhao, Han Nie, Congwu Ge, Yuanjing Cai, Yu Xiong, Ji Qi, Wenting Wu, Ryan T K Kwok, Xike Gao, Anjun Qin, Jacky W Y Lam, Ben Zhong Tang
Furan-cored AIEgen namely tetraphenylethylene-furan (TPE-F) is developed by diyne cyclization and its fluorescent and chemical properties are investigated and compared with its thiophene analogue. Results show that furan is superior to thiophene in terms of fluorescence, chromism, and charge transport. The mechanism of chromism of TPE-F is investigated and its efficient solid-state photoluminescence and good charge-transporting property enable it to serve as light-emitting material for the construction of electroluminescence devices with excellent performance...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Ping Li, Jing Li, Zhe Zhao, Zhengsong Fang, Meijia Yang, Zhongke Yuan, You Zhang, Qiang Zhang, Wei Hong, Xudong Chen, Dingshan Yu
Herein, a general strategy is proposed to boost the energy storage capability of pseudocapacitive materials (i.e., MnO2) to their theoretical limits in unconventional 1D fiber configuration by rationally designing bicontinuous porous Ni skeleton@metal wire "sheath-core" metallic scaffold as a versatile host. As a proof of concept, the 1D metallic scaffold supported-MnO2 fiber electrode is demonstrated. The proposed "sheath" design not only affords large electrode surface area with ordered macropores for large electrolyte-ion accessibility and high electroactive material loading, but also renders interconnected porous metallic skeleton for efficient electronic and ionic transport, while the metallic "core" functions as an extra current collector to promote long-distance electron transport and electron collection...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Bei Liu, Chunxia Li, Guanying Chen, Bin Liu, Xiaoran Deng, Yi Wei, Jun Xia, Bengang Xing, Ping'an Ma, Jun Lin
Elaborately designed biocompatible nanoplatforms simultaneously achieving multimodal bioimaging and therapeutic functions are highly desirable for modern biomedical applications. Herein, uniform MoS2 nanoflowers with a broad size range of 80-180 nm have been synthesized through a facile, controllable, and scalable hydrothermal method. The strong absorbance of MoS2 nanoflowers at 808 nm imparts them with high efficiency and stability of photothermal conversion. Then a novel multifunctional composite of MoS2@Fe3O4-ICG/Pt(IV) (labeled as Mo@Fe-ICG/Pt) is designed by covalently grafting Fe3O4 nanoparticles with polyethylenimine (PEI) functionalized MoS2, and then loading indocyanine green molecules (ICG, photosensitizers) and platinum (IV) prodrugs (labeled as Pt(IV) prodrugs) on the surface of MoS2@Fe3O4...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Hyejin Kim, Jaepil Jeong, Dajeong Kim, Gijung Kwak, Sun Hwa Kim, Jong Bum Lee
As ribonucleic acid (RNA) nanotechnology has advanced, it has been applied widely in RNA-based therapeutics. Among the range of approaches, enzymatically synthesized RNA structures for inducing RNA interference in cancer cells have potential for silencing genes in a target-specific manner. On the other hand, the efficiency of gene silencing needs to be improved to utilize the RNA-based system for RNAi therapeutics. This paper introduces a new approach for efficient generation of siRNA from bubbled RNA-based cargo (BRC)...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Yizhou Zhu, Xingfeng He, Yifei Mo
Lithium metal battery is a promising candidate for high-energy-density energy storage. Unfortunately, the strongly reducing nature of lithium metal has been an outstanding challenge causing poor stability and low coulombic efficiency in lithium batteries. For decades, there are significant research efforts to stabilize lithium metal anode. However, such efforts are greatly impeded by the lack of knowledge about lithium-stable materials chemistry. So far, only a few materials are known to be stable against Li metal...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Soo-Ghang Ihn, Namheon Lee, Soon Ok Jeon, Myungsun Sim, Hosuk Kang, Yongsik Jung, Dal Ho Huh, Young Mok Son, Sae Youn Lee, Masaki Numata, Hiroshi Miyazaki, Rafael Gómez-Bombarelli, Jorge Aguilera-Iparraguirre, Timothy Hirzel, Alán Aspuru-Guzik, Sunghan Kim, Sangyoon Lee
It has been challenging to find stable blue organic light emitting diodes (OLEDs) that rely on thermally activated delayed fluorescence (TADF). Lack of stable host materials well-fitted to the TADF emitters is one of the critical reasons. The most popular host for blue TADF, bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO), leads to unrealistically high maximum external quantum efficiency. DPEPO is however an unstable material and has a poor charge transporting ability, which in turn induces an intrinsic short OLED operating lifespan...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Fan Hu, Tingting Li, Huarui Gong, Zhi Chen, Yan Jin, Guangwei Xu, Ming Wang
Bisphenol A (BPA), an environmental xenoestrogen, has been reported to induce learning and memory impairments in rodent animals. However, effects of BPA exposure on synaptic plasticity and the underlying physiological mechanisms remain elusive. Our behavioral and electrophysiological analyses show that BPA obviously perturbs hippocampal spatial memory of juvenile Sprague-Dawley rats after four weeks exposure, with significantly impaired long-term potentiation (LTP) in the hippocampus. These effects involve decreased spine density of pyramidal neurons, especially the apical dendritic spine...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Yuan Yang, Ting Du, Jiumeng Zhang, Tianyi Kang, Li Luo, Jie Tao, Zhiyuan Gou, Shaochen Chen, Yanan Du, Jiankang He, Shu Jiang, Qing Mao, Maling Gou
Gene therapy has great promise for glioblastoma treatment; however, it remains a great challenge to efficiently deliver genes to the brain. The incomplete resection of glioblastoma always leads to poor prognosis. Here, a 3D-engineered conformal implant for eradicating the postsurgery residual glioblastoma is designed. This implant is constructed by 3D-printing technology to match the tumor cavity and release an oncolytic virus-inspired DNA nanocomplex to kill glioblastoma cells through apoptosis induction. Meanwhile, a 3D-engineered subcutaneous glioblastoma xenograft is built to mimic the resection tumor cavity in mice...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Huashan Li, Jeffrey C Grossman
Control of both the regularity of a material ensemble and nanoscale architecture provides unique opportunities to develop novel thermoelectric applications based on 2D materials. As an example, the authors explore the electronic and thermal properties of functionalized graphene nanoribbons (GNRs) in the single-sheet and helical architectures using multiscale simulations. The results suggest that appropriate functionalization enables precise tuning of the doping density in a planar donor/acceptor GNR ensemble without the need to introduce an explicit dopant, which is critical to the optimization of power factor...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Su-Ting Han, Liang Hu, Xiandi Wang, Ye Zhou, Yu-Jia Zeng, Shuangchen Ruan, Caofeng Pan, Zhengchun Peng
Solution-processed black phosphorus quantum-dot-based resistive random access memory is demonstrated with tunable characteristics, multilevel data storage, and ultrahigh ON/OFF ratio. Effects of the black phosphorous quantum dots layer thickness and the compliance current setting on resistive switching behavior are systematically studied. Our devices can yield a series of SET voltages and current levels, hence having the potential for practical applications in the flexible electronics industry.
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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