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ACS applied materials & interfaces 92건

  1. [해외논문]   Nanoionics-Based Three-Terminal Synaptic Device Using Zinc Oxide   SCI SCIE

    Balakrishna Pillai, Premlal , De Souza, Maria Merlyne
    ACS applied materials & interfaces v.9 no.2 ,pp. 1609 - 1618 , 2017 , 1944-8244 ,

    초록

    Artificial synaptic thin film transistors (TFTs) capable of simultaneously manifesting signal transmission and self-learning are demonstrated using transparent zinc oxide (ZnO) in combination with high κ tantalum oxide as gate insulator. The devices exhibit pronounced memory retention with a memory window in excess of 4 V realized using an operating voltage less than 6 V. Gate polarity induced motion of oxygen vacancies in the gate insulator is proposed to play a vital role in emulating synaptic behavior, directly measured as the transmission of a signal between the source and drain (S/D) terminals, but with the added benefit of independent control of synaptic weight. Unlike in two terminal memristor/resistive switching devices, multistate memory levels are demonstrated using the gate terminal without hampering the signal transmission across the S/D electrodes. Synaptic functions in the devices can be emulated using a low programming voltage of 200 mV, an order of magnitude smaller than in conventional resistive random access memory and other field effect transistor based synaptic technologies. Robust synaptic properties demonstrated using fully transparent, ecofriendly inorganic materials chosen here show greater promise in realizing scalable synaptic devices compared to organic synaptic and other liquid electrolyte gated device technologies. Most importantly, the strong coupling between the in-plane gate and semiconductor channel through ionic charge in the gate insulator shown by these devices, can lead to an artificial neural network with multiple presynaptic terminals for complex synaptic learning processes. This provides opportunities to alleviate the extreme requirements of component and interconnect density in realizing brainlike systems. Graphic Abstract ACS Electronic Supporting Info

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  2. [해외논문]   Zero-Power-Consumption Solar-Blind Photodetector Based on β-Ga2O3/NSTO Heterojunction   SCI SCIE

    Guo, Daoyou (Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, ) , Liu, Han (Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, ) , Li, Peigang (Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, ) , Wu, Zhenping (State Key Laboratory of Information Photonics and Optical Communications & Laboratory of Optoelectronics Materials and Devices, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, ) , Wang, Shunli (Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, ) , Cui, Can (Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, ) , Li, Chaorong (Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, ) , Tang, Weihua (Center for Optoelectronics Materials and Devices, D)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1619 - 1628 , 2017 , 1944-8244 ,

    초록

    A solar-blind photodetector based on β-Ga 2 O 3 /NSTO (NSTO = Nb:SrTiO 3 ) heterojunctions were fabricated for the first time, and its photoelectric properties were investigated. The device presents a typical positive rectification in the dark, while under 254 nm UV light illumination, it shows a negative rectification, which might be caused by the generation of photoinduced electron–hole pairs in the β-Ga 2 O 3 film layer. With zero bias, that is, zero power consumption, the photodetector shows a fast photoresponse time (decay time τ d = 0.07 s) and the ratio I photo /I dark ≈ 20 under 254 nm light illumination with a light intensity of 45 μW/cm 2 . Such behaviors are attributed to the separation of photogenerated electron–hole pairs driven by the built-in electric field in the depletion region of β-Ga 2 O 3 and the NSTO interface, and the subsequent transport toward corresponding electrodes. The photocurrent increases linearly with increasing the light intensity and applied bias, while the response time decreases with the increase of the light intensity. Under −10 V bias and 45 μW/cm 2 of 254 nm light illumination, the photodetector exhibits a responsivity R λ of 43.31 A/W and an external quantum efficiency of 2.1 × 10 4 %. The photo-to-electric conversion mechanism in the β-Ga 2 O 3 /NSTO heterojunction photodetector is explained in detail by energy band diagrams. The results strongly suggest that a photodetector based on β-Ga 2 O 3 thin-film heterojunction structure can be practically used to detect weak solar-blind signals because of its high photoconductive gain. Graphic Abstract

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  3. [해외논문]   Two Lanthanide Metal–Organic Frameworks as Remarkably Selective and Sensitive Bifunctional Luminescence Sensor for Metal Ions and Small Organic Molecules   SCI SCIE

    Yan, Wei , Zhang, Chuanlei , Chen, Shuguang , Han, Lijuan , Zheng, Hegen
    ACS applied materials & interfaces v.9 no.2 ,pp. 1629 - 1634 , 2017 , 1944-8244 ,

    초록

    Two lanthanide metal–organic frameworks (Ln-MOFs) with similar structures have been synthesized through objective synthesis. The two compounds are both 2-fold interpenetrating 3D frameworks. Topological analyses reveal that complexes 1 and 2 are 6-connected pcu net. In addition, both structures were embedded in uncoordinated nitrogen atoms. As the uncoordinated pyridine groups can be used as functional groups, we tested their sensing ability toward metal ions and small organic molecules. To our delight, fluorescence measurements show the two complexes can selectively and sensitively detect for Fe 3+ ion and nitromethane, which suggests that the two Ln-MOFs are promising bifunctional luminescence sensor materials with sensing metal ions and small organic molecules. Graphic Abstract ACS Electronic Supporting Info

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  4. [해외논문]   Lanthanoid-Doped Phosphate/Vanadate Mixed Hollow Particles as Ratiometric Luminescent Sensors   SCI SCIE

    de Sousa Filho, Paulo C. (Rare Earth Laboratory, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto, São Paulo 14040-901, ) , Larquet, Eric (Solid State Chemistry Group/Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau Cedex, ) , Dragoë (Institute de Chimie Moleculaire et des Matériaux d'Orsay, Université) , , Diana (Paris-Sud-11/Université) , Serra, Osvaldo A. (Paris-Saclay, Rue du Doyen Georges Poitou, 91400 Orsay, ) , Gacoin, Thierry (Rare Earth Laboratory, Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto, São Paulo 14040-901, )
    ACS applied materials & interfaces v.9 no.2 ,pp. 1635 - 1644 , 2017 , 1944-8244 ,

    초록

    Rare earth (RE) phosphates and vanadates are structurally similar compositions that display distinct but complementary luminescent properties. The properties of these phosphors can be combined in REPO 4 -REVO 4 heterostructures during the development of new sensing technologies for biological applications. This work presents the synthesis of hollow RE phosphate/vanadate colloidal particles and evaluates their applicability as luminescent markers. Hydrothermal treatments of RE hydroxycarbonate particles in the presence of the PO 4 3– and VO 4 3– precursors afforded the final REPO 4 –REVO 4 solids in a two-step template synthesis. We converted precursor hydroxycarbonate particles into the final heterostructures and characterized their structure and morphology. According to our detailed study into the spectroscopic properties of Eu 3+ -doped particles and their luminescence response to several species, the presence of the phosphate and vanadate phases in a single particle provided different chemical environments and enabled the design of a ratiometric approach to detect H 2 O 2 . These results open new perspectives for the development of new intracellular luminescent markers. Graphic Abstract ACS Electronic Supporting Info

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  5. [해외논문]   Low-Temperature Solution-Processed SnO2 Nanoparticles as a Cathode Buffer Layer for Inverted Organic Solar Cells   SCI SCIE

    Tran, Van-Huong (School of Advanced Materials Engineering and Research Center of Advanced Materials Development, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, ) , Ambade, Rohan B. (School of Semiconductor and Chemical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, ) , Ambade, Swapnil B. (School of Semiconductor and Chemical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, ) , Lee, Soo-Hyoung (School of Semiconductor and Chemical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, ) , Lee, In-Hwan (School of Advanced Materials Engineering and Research Center of Advanced Materials Development, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1645 - 1653 , 2017 , 1944-8244 ,

    초록

    SnO2 recently has attracted particular attention as a powerful buffer layer for organic optoelectronic devices due to its outstanding properties such as high electron mobility, suitable band alignment, and high optical transparency. Here, we report on facile low-temperature solution-processed SnO2 nanoparticles (NPs) in applications for a cathode buffer layer (CBL) of inverted organic solar cells (iOSCs). The conduction band energy of SnO2 NPs estimated by ultraviolet photoelectron spectroscopy was 4.01 eV, a salient feature that is necessary for an appropriate CBL. Using SnO2 NPs as CBL derived from a 0.1 M precursor concentration, P3HT:PC60BM-based iOSCs showed the best power conversion efficiency (PCE) of 2.9%. The iOSC devices using SnO2 NPs as CBL revealed excellent long-term device stabilities, and the PCE was retained at similar to 95% of its initial value after 10 weeks in ambient air. These solution-processed SnO2 NPs are considered to be suitable for the low-cost, high throughput roll-to-roll process on a flexible substrate for optoelectronic devices.

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  6. [해외논문]   Temperature-Dependent Detectivity of Near-Infrared Organic Bulk Heterojunction Photodiodes   SCI SCIE

    Wu, Zhenghui (Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, ) , Yao, Weichuan (Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, ) , London, Alexander E. (School of Polymers and High Performance Materials, University of Southern Mississippi, 118 College Drive #5050, Hattiesburg, Mississippi 39406, ) , Azoulay, Jason D. (School of Polymers and High Performance Materials, University of Southern Mississippi, 118 College Drive #5050, Hattiesburg, Mississippi 39406, ) , Ng, Tse Nga (Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1654 - 1660 , 2017 , 1944-8244 ,

    초록

    Bulk heterojunction photodiodes are fabricated using a new donor–acceptor polymer with a near-infrared absorption edge at 1.2 μm, achieving a detectivity up to 10 12 Jones at a wavelength of 1 μm and an excellent linear dynamic range of 86 dB. The photodiode detectivity is maximized by operating at zero bias to suppress dark current, while a thin 175 nm active layer is used to facilitate charge collection without reverse bias. Analysis of the temperature dependence of the dark current and spectral response demonstrates a 2.8-fold increase in detectivity as the temperature was lowered from 44 to −12 °C, a relatively small change when compared to that of inorganic-based devices. The near-infrared photodiode shows a switching speed reaching up to 120 μs without an external bias. An application using our NIR photodiode to detect arterial pulses of a fingertip is demonstrated. Graphic Abstract

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  7. [해외논문]   Au-Loaded Hierarchical MoO3 Hollow Spheres with Enhanced Gas-Sensing Performance for the Detection of BTX (Benzene, Toluene, And Xylene) And the Sensing Mechanism   SCI SCIE

    Sui, Lili (Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, ) , Zhang, Xianfa (Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, ) , Cheng, Xiaoli (Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, ) , Wang, Ping (Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, ) , Xu, Yingming (Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, ) , Gao, Shan (Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080,) , Zhao, Hui , Huo, Lihua
    ACS applied materials & interfaces v.9 no.2 ,pp. 1661 - 1670 , 2017 , 1944-8244 ,

    초록

    Monodisperse, hierarchical α-MoO 3 hollow spheres were fabricated using a facile template-free solvothermal method combined with subsequent calcination. Various quantities of Au nanoparticles (NPs) were deposited on the α-MoO 3 hollow spheres to construct hybrid nanomaterials for chemical gas sensors and their BTX sensing properties were investigated. The 2.04 wt % Au-loaded α-MoO 3 sensor can detect BTX effectively at 250 °C, especially, its responses to 100 ppm toluene and xylene are 17.5 and 22.1, respectively, which are 4.6 and 3.9 times higher than those of pure α-MoO 3 hollow spheres at 290 °C. Besides, Au loading decreased the response times to toluene and xylene from 19 and 6 s to 1.6 and 2 s, respectively, lowered the working temperature from 290 to 250 °C as compared with those of pure α-MoO 3 . The surface status of Au/α-MoO 3 hollow spheres before and after contacting with toluene at 250 °C was analyzed through XPS technique. Possible oxidization product of toluene was confirmed by GC for the first time. The gas-sensing mechanism of the Au/α-MoO 3 was speculated as the oxidation of toluene to water and carbon dioxide by chemisorbed oxygen and lattice oxygen. The possible reason related with improved gas-sensing properties of the Au-functionalized α-MoO 3 was discussed. Graphic Abstract ACS Electronic Supporting Info

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  8. [해외논문]   Controlling Microstructure–Transport Interplay in Highly Phase-Separated Perfluorosulfonated Aromatic Multiblock Ionomers via Molecular Architecture Design   SCI SCIE

    Nguyen, Huu-Dat (LEPMI, Université) , Assumma, Luca (Grenoble Alpes −) , Judeinstein, Patrick (CNRS, 38000 Grenoble, ) , Mercier, Regis (LEPMI, Université) , Porcar, Lionel (Grenoble Alpes −) , Jestin, Jacques (CNRS, 38000 Grenoble, ) , Iojoiu, Cristina (Laboratoire Léon Brillouin (LLB), CNRS-CEA, Université) , Lyonnard, Sandrine (Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, )
    ACS applied materials & interfaces v.9 no.2 ,pp. 1671 - 1683 , 2017 , 1944-8244 ,

    초록

    Proton-conducting multiblock polysulfones bearing perfluorosulfonic acid side chains were designed to encode nanoscale phase-separation, well-defined hydrophilic/hydrophobic interfaces, and optimized transport properties. Herein, we show that the superacid side chains yield highly ordered morphologies that can be tailored by best compromising ion-exchange capacity and block lengths. The obtained microstructures were extensively characterized by small-angle neutron scattering (SANS) over an extended range of hydration. Peculiar swelling behaviors were evidenced at two different scales and attributed to the dilution of locally flat polymer particles. We evidence the direct correlation between the quality of interfaces, the topology and connectivity of ionic nanodomains, the block superstructure long-range organization, and the transport properties. In particular, we found that the proton conductivity linearly depends on the microscopic expansion of both ionic and block domains. These findings indicate that neat nanoscale phase-separation and block-induced long-range connectivity can be optimized by designing aromatic ionomers with controlled architectures to improve the performances of polymer electrolyte membranes. Graphic Abstract ACS Electronic Supporting Info

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  9. [해외논문]   In-Plane Mosaic Potential Growth of Large-Area 2D Layered Semiconductors MoS2–MoSe2 Lateral Heterostructures and Photodetector Application   SCI SCIE

    Chen, Xiaoshuang (Key Lab of Microsystem and Microstructure of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ) , Qiu, Yunfeng (Key Lab of Microsystem and Microstructure of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ) , Yang, Huihui (Key Lab of Microsystem and Microstructure of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ) , Liu, Guangbo (Key Lab of Microsystem and Microstructure of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ) , Zheng, Wei (Key Lab of Microsystem and Microstructure of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ) , Feng, Wei (Key Lab of Microsystem and Microstructure of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ) , Cao, Wenwu (Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080, ) , Hu, Wenping (Department of Physics, Harbin Institute of Technology, Harbin 150080, ) , Hu, PingAn (Key Lab of Microsystem and Microstructure of Ministry of Education, Harbin Institute of Technology, Harbin 150080,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1684 - 1691 , 2017 , 1944-8244 ,

    초록

    Considering the unique layered structure and novel optoelectronic properties of individual MoS 2 and MoSe 2 , as well as the quantum coherence or donor–acceptor coupling effects between these two components, rational design and artificial growth of in-plane mosaic MoS 2 /MoSe 2 lateral heterojunctions film on conventional amorphous SiO 2 /Si substrate are in high demand. In this article, large-area, uniform, high-quality mosaic MoS 2 /MoSe 2 lateral heterojunctions film was successfully grown on SiO 2 /Si substrate for the first time by chemical vapor deposition (CVD) technique. MoSe 2 film was grown along MoS 2 triangle edges and occupied the blanks of the substrate, finally leading to the formation of mosaic MoS 2 /MoSe 2 lateral heterojunctions film. The composition and microstructure of mosaic MoS 2 /MoSe 2 lateral heterojunctions film were characterized by various analytic techniques. Photodetectors based on mosaic MoS 2 /MoSe 2 lateral heterojunctions film, triangular MoS 2 monolayer, and multilayer MoSe 2 film are systematically investigated. The mosaic MoS 2 /MoSe 2 lateral heterojunctions film photodetector exhibited optimal photoresponse performance, giving rise to responsivity, detectivity, and external quantum efficiency (EQE) up to 1.3 A W –1 , 2.6 × 10 11 Jones, and 263.1%, respectively, under the bias voltage of 5 V with 0.29 mW cm –2 (610 nm), possibly due to the matched band alignment of MoS 2 and MoSe 2 and strong donor–acceptor delocalization effect between them. Taking into account the similar edge conditions of transition metal dichalcogenides (TMDCs), such a facile and reliable approach might open up a unique route for preparing other 2D mosaic lateral heterojunctions films in a manipulative manner. Furthermore, the mosaic lateral heterojunctions film like MoS 2 /MoSe 2 in the present work will be a promising candidate for optoelectronic fields. Graphic Abstract ACS Electronic Supporting Info

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  10. [해외논문]   Regulating the Catalytic Function of Reduced Graphene Oxides Using Capping Agents for Metal-Free Catalysis   SCI SCIE

    Song, Jaeeun (Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141, ) , Kang, Shin Wook (Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141, ) , Lee, Young Wook (Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141, ) , Park, Yangsun (Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141, ) , Kim, Jun-Hyun (Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141, ) , Han, Sang Woo (Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1692 - 1701 , 2017 , 1944-8244 ,

    초록

    Reduced graphene oxide (rGO) functionalized with organic capping agents has gained increasing attention as a promising metal-free catalyst. To optimize the properties of rGO for target applications, comprehending the link between the catalytic function of rGO and the chemical and structural characteristics of capping agents is critical. Herein, we report a systematic study on the effect of capping agents on the catalytic function of rGO for redox reactions using nitrogen-containing surface modifiers with distinctly different chemical structures, such as poly(diallyldimethylammonium chloride), cetyltrimethylammonium chloride, and poly(allylamine hydrochloride), which have the capability to endow rGO with improved suspension stability, enhanced reactant adsorption, and modified electronic properties. Functionalized rGOs were facilely prepared by the reduction of graphene oxide with hydrazine in the presence of the capping agents. The results of model redox reactions, that is, 4-nitrophenol and ferricyanide reduction reactions, catalyzed by the functionalized rGOs corroborated that the way the capping agents functionalize rGO, which is highly correlated with their chemical structure, drastically influences the overall reaction kinetics, including induction time, reduction rate, total reaction time, and reaction order. This strongly suggests that the judicious selection of capping agents is crucial to fully harness the catalytic function of rGO and thus to design novel rGO-based non-metallic catalysts with controllable reaction kinetics.

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