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Wu-Ji Sun Yong-Yan Zhao Jin Zhou Xue-Feng Cheng Prof. Jing-Hui He Prof. Jian-Mei Lu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(18):4808-4813
Recently, resistance random access memories (RRAMs) have been studied extensively, because the demand for information storage is increasing. However, it remains challenging to obtain a flexible device because the active materials involved need to be nontoxic, nonpolluting, distortion-tolerable, and biodegradable as well adhesive to diverse flexible substrates. In this paper, tannic acid (TA) and an iron ion (FeIII) coordination complex were employed as the active layer in a sandwich-like (Al/active layer/substrate) device to achieve memory performance. A nontoxic, biocompatible TA-FeIII coordination complex was synthesized by a one-step self-assembly solution method. The retention time of the TA-FeIII memory performance was up to 15 000 s, the yield up to 53 %. Furthermore, the TA-FeIII coordination complex can form a high-quality film and shows stable ternary memory behavior on various flexible substrates, such as polyethylene terephthalate (PET), polyimide (PI), printer paper, and leaf. The device can be degraded by immersing it in vinegar solution. Our work will broaden the application of organic coordination complexes in flexible memory devices with diverse substrates. 相似文献
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Dr. Qi‐jian Zhang Prof. Jing‐hui He Hao Zhuang Prof. Hua Li Prof. Na‐jun Li Prof. Qing‐feng Xu Dr. Dong‐yun Chen Prof. Jian‐mei Lu 《化学:亚洲杂志》2016,11(10):1624-1630
Flexible memory devices have continued to attract more attention due to the increasing requirement for miniaturization, flexibility, and portability for further electronic applications. However, all reported flexible memory devices have binary memory characteristics, which cannot meet the demand of ever‐growing information explosion. Organic resistive switching random access memory (RRAM) has plenty of advantages such as simple structure, facile processing, low power consumption, high packaging density, as well as the ability to store multiple states per bit (multilevel). In this study, we report a small molecule‐based flexible ternary memory device for the first time. The flexible device maintains its ternary memory behavior under different bending conditions and within 500 bending cycles. The length of the alkyl chains in the molecular backbone play a significant role in molecular stacking, thus guaranteeing satisfactory memory and mechanical properties. 相似文献
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Wenbo Sheng Wei Li Bo Yu Bin Li Rainer Jordan Xin Jia Feng Zhou 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(35):12146-12150
Mussel‐inspired two‐dimensional freestanding, alkyl‐polydopamine (alkyl‐PDA) Janus nanosheets, with a well‐controlled nanometer thickness and a lateral size of up to micrometers, have been developed. A self‐assembled octadecylamine (ODA) bilayer is used as the reactive template for the dopamine polymerization, resulting in the formation of well‐defined nanosheets. The alkyl‐PDA nanosheets show an amphiphilic nature with hydrophilic PDA and hydrophobic alkyl chains on opposing sides. The nanosheets can be used to functionalize many substrates and is dependent on the configuration of surface of the nanosheets. The nanosheets are quite stable, as the morphology is preserved after carbonization at 900 °C. Post‐modification of the nanosheets can be easily achieved because of the reactive nature of PDA. This work will provide a new strategic approach for fabricating polymeric Janus nanosheets, which can find applications for surface modifications, catalyst supports, and guided self‐assembly. 相似文献
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A Solution‐Processable Donor–Acceptor Compound Containing Boron(III) Centers for Small‐Molecule‐Based High‐Performance Ternary Electronic Memory Devices 下载免费PDF全文
Dr. Chun‐Ting Poon Dr. Di Wu Dr. Wai Han Lam Prof. Dr. Vivian Wing‐Wah Yam 《Angewandte Chemie (International ed. in English)》2015,54(36):10569-10573
A novel small‐molecule boron(III)‐containing donor–acceptor compound has been synthesized and employed in the fabrication of solution‐processable electronic resistive memory devices. High ternary memory performances with low turn‐on (VTh1=2.0 V) and distinct threshold voltages (VTh2=3.3 V), small reading bias (1.0 V), and long retention time (>104 seconds) with a large ON/OFF ratio of each state (current ratio of “OFF”, “ON1”, and “ON2”=1:103:106) have been demonstrated, suggestive of its potential application in high‐density data storage. The present design strategy provides new insight in the future design of memory devices with multi‐level transition states. 相似文献
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Hailong Yang Guoli Yue Tao Li Lingling Du Prof. Haohong Li Prof. Zhirong Chen Prof. Shoutian Zheng 《欧洲无机化学杂志》2023,26(32):e202300264
The coming big-data era has created a huge demand for next-generation memory technologies with characters of higher data-storage densities, faster access speeds, lower power consumption and better environmental compatibility. In this field, the design of resistive switching active materials is pivotal but challengeable. Polyoxometalates (POMs) are promising candidates for next-generation molecular memristors due to their versatile redox characters, excellent electron reservoirs and good compatibility/convenience in microelectronics processing. In this review, five kinds of POM-based active materials in nonvolatile memories (inorganic POMs, crystalline organic-inorganic hybrid POMOFs, polymer modified POMs, POM/transition metal oxides composites and the deposition of POM on metal surfaces) were described. The components of POMs active materials, device fabrications, device parameters, and resistive switching mechanisms relative to their structures were summarized. Finally, challenges and future perspectives of POMs-based memristors were also presented. 相似文献
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Ai He Chao Zhang Yan Lv Qi‐Zhi Zhong Xi Yang Zhi‐Kang Xu 《Macromolecular rapid communications》2016,37(17):1460-1465
Polydopamine‐based coatings are fabricated via an electric field‐accelerating and ‐directing codeposition process of polydopamine with charged polymers such as polycations, polyanions, and polyzwitterions. The coatings are uniform and smooth on various substrates, especially on those adhesion‐resistant materials including poly(vinylidene fluoride) and poly(tetrafluoroethylene) membranes. Moreover, this electric field‐directed deposition method can be applied to facilely prepare Janus membranes with asymmetric chemistry and wettability.
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CuSO4/H2O2‐Induced Rapid Deposition of Polydopamine Coatings with High Uniformity and Enhanced Stability 下载免费PDF全文
Chao Zhang Yang Ou Wen‐Xi Lei Prof. Dr. Ling‐Shu Wan Prof. Dr. Jian Ji Prof. Dr. Zhi‐Kang Xu 《Angewandte Chemie (International ed. in English)》2016,55(9):3054-3057
Mussel‐inspired polydopamine (PDA) deposition offers a promising route to fabricate multifunctional coatings for various materials. However, PDA deposition is generally a time‐consuming process, and PDA coatings are unstable in acidic and alkaline media, as well as in polar organic solvents. We report a strategy to realize the rapid deposition of PDA by using CuSO4/H2O2 as a trigger. Compared to the conventional processes, our strategy shows the fastest deposition rate reported to date, and the PDA coatings exhibit high uniformity and enhanced stability. Furthermore, the PDA‐coated porous membranes have excellent hydrophilicity, anti‐oxidant properties, and antibacterial performance. This work demonstrates a useful method for the environmentally friendly, cost‐effective, and time‐saving fabrication of PDA coatings. 相似文献
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Chenxu Zhao Fang Zuo Zhijian Liao Zhenli Qin Sinan Du Zhigang Zhao 《Macromolecular rapid communications》2015,36(10):909-915
Inspired by the molecular mechanics of mussel adhesive formation, a novel water‐soluble fluorescent macromolecule (polydopamine–polyethyleneimine (PDA–PEI)) is prepared by one‐pot copolymerization of dopamine (DA) and PEI. In this method, DA is polymerized to form PDA, which is then coupled with PEI mainly through Michael addition. The fluorescence property of PDA–PEI is mainly attributed to the Michael addition of PEI on the 5,6‐dihydroxyindole (DHI) units of PDA, where PEI can form hydrogen bonds with oxidative products such as DHI and force the DHI units to twist out of plane, resulting in a decrease in the intra‐ and intermolecular coupling of PDA. In addition, the influence of various metal cations on the fluorescence of the PDA–PEI copolymer is investigated. This work may facilitate the development of new strategies for controlling the emission characteristics of PDA.
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Hanju Jo Jieun Ko Jung Ah Lim Hye Jung Chang Youn Sang Kim 《Macromolecular rapid communications》2013,34(4):355-361
Organic nonvolatile resistive switching memory is developed via selective incorporation of fullerene derivatives, [6,6]‐phenyl‐C61 butyric acid methyl ester (PCBM), into the nanostructure of self‐assembled poly(styrene‐b‐methyl methacrylate) (PS10‐b‐PMMA130) diblock copolymer. PS10‐b‐PMMA130 diblock copolymer provides a spatially ordered nanotemplate with a 10‐nm PS nanosphere domain surrounded by a PMMA matrix. Spin casting of the blend solution of PS10‐b‐PMMA130 and PCBM spontaneously forms smooth films without PCBM aggregation in which PCBM molecules are incorporated within a PS nanosphere domain of PS10‐b‐PMMA130 nanostructure by preferential intermixing propensity of PCBM and PS. Based on the well‐defined PS10‐b‐PMMA130/PCBM nanostructure, resistive random access memory (ReRAM) exhibits significantly improved bipolar‐switching behavior with stable and reproducible properties at low operating voltages (RESET at 1.3 V and SET at −1.5 V) under ambient conditions. Finally, flexible memory devices are achieved using a nanostructured PS10‐b‐PMMA130/PCBM composite in which no significant degradation of electrical properties is observed before and after bending. 相似文献
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Dr. Hye Jin Nam Boeun Kim Dr. Min Jae Ko Mingshi Jin Prof. Ji Man Kim Prof. Duk‐Young Jung 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(44):14000-14007
The efficient electron injection by direct dye‐to‐TiO2 charge transfer and strong adhesion of mussel‐inspired synthetic polydopamine (PDA) dyes with TiO2 electrode is demonstrated. Spontaneous self‐polymerization of dopamine using dip‐coating (DC) and cyclic voltammetry (CV) in basic buffer solution were applied to TiO2 layers under a nitrogen atmosphere, which offers a facile and reliable synthetic pathway to make the PDA dyes, PDA‐DC and PDA‐CV, with conformal surface and perform an efficient dye‐to‐TiO2 charge transfer. Both synthetic methods led to excellent photovoltaic results and the PDA‐DC dye exhibited larger current density and efficiency values than those in the PDA‐CV dye. Under simulated AM 1.5 G solar light (100 mW cm?2), a PDA‐DC dye exhibited a short circuit current density of 5.50 mW cm?2, corresponding to an overall power conversion efficiency of 1.2 %, which is almost 10 times that of the dopamine dye‐sensitized solar cell. The PDA dyes showed strong adhesion with the nanocrystalline TiO2 electrodes and the interface engineering of a dye‐adsorbed TiO2 surface through the control of the coating methods, reaction times and solution concentration maximized the overall conversion efficiency, resulting in a remarkably high efficiency. 相似文献
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Wenbo Sheng Wei Li Bin Li Cuihua Li Yisheng Xu Xuhong Guo Feng Zhou Xin Jia 《Macromolecular rapid communications》2015,36(18):1640-1645
A thermo‐controlled pesticide release system composed of poly(2‐(dimethylamino)ethyl methacrylate) (PDMAEMA) thin film grafted polydopamine (PDA) (PDMAEMA‐g‐PDA) microcapsules is reported. SiO2 microparticles are used as a template to prepare PDA‐coated SiO2 microparticles. The thermally‐responsive PDMAEMA thin films are grafted on PDA surfaces using a metal‐free surface‐initiated photopolymerization approach without adding any photoinitiator or photosensitizer under UV light irradiation. The subsequent acid etching yields PDMAEMA‐g‐PDA hollow microcapsules. PDMAEMA‐g‐PDA microcapsules exhibit well‐controlled release of avermectin (Av). The results show that the loading ability of PDMAEMA‐g‐PDA microcapsules of Av is up to 52.7% (w/w). The release kinetics of Av demonstrate that Av@PDMAEMA‐g‐PDA microcapsules exhibit temperature‐controlled release performance. This work is significant for controlled release systems. This simple design is expected to be used in various applications, such as in controlled drug release and agriculture‐related fields.
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《化学:亚洲杂志》2017,12(1):45-51
Herein, two molecules based on urea and thiourea, which differ by only a single atom, were designed, successfully synthesized, and fabricated into resistive random‐access memory devices (RRAM). The urea‐based molecule showed binary write‐once‐read‐many (WORM) storage behavior, whereas the thiourea‐based molecule demonstrated ternary storage behavior. Atomic‐force microscopy (AFM) and X‐ray diffraction (XRD) patterns show that both molecules have smooth morphology and ordered layer‐by‐layer lamellar packing, which is beneficial for charge transportation and, consequently, device performance. Additionally, the optical and electrochemical properties indicate that the thiourea‐based molecule has a lower bandgap and may be polarized by trapped charges, thus the formation of a continuous conductive channel and electric switching occurs at lower bias voltage, which results in ternary WORM behavior. This study, together with our previous work on single‐atom substitution, may be useful to tune and improve device performance in the future design of organic memory. 相似文献
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Dr. Seok Min Yoon Dr. Scott C. Warren Prof. Bartosz A. Grzybowski 《Angewandte Chemie (International ed. in English)》2014,53(17):4437-4441
Single crystals of a cyclodextrin‐based metal–organic framework (MOF) infused with an ionic electrolyte and flanked by silver electrodes act as memristors. They can be electrically switched between low and high conductivity states that persist even in the absence of an applied voltage. In this way, these small blocks of nanoporous sugar function as a non‐volatile RRAM memory elements that can be repeatedly read, erased, and re‐written. These properties derive from ionic current within the MOF and the deposition of nanometer‐thin passivating layers at the anode flanking the MOF crystal. The observed phenomena are crucially dependent on the sub‐nanometer widths of the channels in the MOF, allowing the passage of only smaller ions. Conversely, with the electrolyte present but no MOF, there are no memristance or memory effects. 相似文献
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Superior Electrical Conductivity in Hydrogenated Layered Ternary Chalcogenide Nanosheets for Flexible All‐Solid‐State Supercapacitors 下载免费PDF全文
Dr. Xin Hu Wei Shao Xudong Hang Dr. Xiaodong Zhang Prof. Wenguang Zhu Prof. Yi Xie 《Angewandte Chemie (International ed. in English)》2016,55(19):5733-5738
As the properties of ultrathin two‐dimensional (2D) crystals are strongly related to their electronic structures, more and more attempts were carried out to tune their electronic structures to meet the high standards for the construction of next‐generation smart electronics. Herein, for the first time, we show that the conductive nature of layered ternary chalcogenide with formula of Cu2WS4 can be switched from semiconducting to metallic by hydrogen incorporation, accompanied by a high increase in electrical conductivity. In detail, the room‐temperature electrical conductivity of hydrogenated‐Cu2WS4 nanosheet film was almost 1010 times higher than that of pristine bulk sample with a value of about 2.9×104 S m?1, which is among the best values for conductive 2D nanosheets. In addition, the metallicity in the hydrogenated‐Cu2WS4 is robust and can be retained under high‐temperature treatment. The fabricated all‐solid‐state flexible supercapacitor based on the hydrogenated‐Cu2WS4 nanosheet film shows promising electrochemical performances with capacitance of 583.3 F cm?3 at a current density of 0.31 A cm?3. This work not only offers a prototype material for the study of electronic structure regulation in 2D crystals, but also paves the way in searching for highly conductive electrodes. 相似文献