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Facile fabrication of 3D layer-by-layer graphene-gold nanorod hybrid architecture for hydrogen peroxide based electrochemical biosensor

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Sensing and Bio-Sensing Research 2015年 3卷 7-11页

作者： Xue, Chenming Kung, Chih-Chien Gao, Min Liu, Chung-Chiun Dai, Liming Urbas, Augustine Li, Quan Kent State University Kent 44242 OH United States Department of Chemical Engineering Case Western Reserve University Cleveland 44106 OH United States Department of Macromolecular Science and Engineering Case Western Reserve University Cleveland 44106 OH United States Materials and Manufacturing Directorate Air Force Research Laboratory WPAFB 45433 OH United States

Three-dimensional (3D) layer-by-layer graphene-gold nanorod (GNR) architecture has been constructed. The resulting hybrid nanomaterials' architecture has been tested for detecting hydrogen peroxide (H₂O₂) through the electrocatalytic reaction on a three electrode disposable biosensor platform. Cyclic voltammetry and amperometry were used to characterize and assess the performance of the biosensor. The 3D layer-by-layer modified electrode exhibited the highest sensitivity compared to the active carbon, graphene-oxide, cysteine-graphene oxide and GNR coated electrodes. This research explored the feasibility of using the 3D hybrid graphene-GNR as a template for biosensor. The 3D hybrid structure exhibited higher sensitivity than GNRs alone. SEM showed the explanation that GNRs had self-aggregates reducing the contact surface area when coated on the active carbon electrode, while there were no such aggregates in the 3D structure, and TEM illustrated that GNRs dispersed well in the 3D structure. This research demonstrated a better way to prepare well-separated metal nanoparticles by using the 3D layer-by-layer structure. Consequently, other single and bi-metallic metal nanoparticles could be incorporated into such structure. As a practical example, 3D layer-by-layer nanomaterials modified active carbon electrode was used for detecting glucose showing very good sensitivity and minimum interference by ascorbic acid and uric acid in test solution, which indicated a good selectivity of the biosensor as well. © 2014 The Authors.

关键词： 3D hybrid nanostructure Biosensor Gold nanorod Graphene H2O2 detection

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Magnetoelectric memory function with optical readout

arXiv

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arXiv 2017年

作者： Kocsis, V. Penc, K. Rõõm, T. Nagel, U. Vít, J. Romhányi, J. Tokunaga, Y. Taguchi, Y. Tokura, Y. Kézsmárki, I. Bordács, S. Wako Saitama351-0198 Japan Department of Physics Budapest University of Technology and Economics and MTA-BME Lendület Magneto-optical Spectroscopy Research Group Budapest1111 Hungary Institute for Solid State Physics and Optics Wigner Research Centre for Physics Hungarian Academy of Sciences P.O.B. 49 BudapestH-1525 Hungary National Institute of Chemical Physics and Biophysics Tallinn12618 Estonia Institute of Physics ASCR Na Slovance 2 Prague 8182 21 Eue Faculty of Nuclear Science and Physical Engineering Czech Technical University Břehová 7 Prague 1115 19 Eue Okinawa Institute of Science and Technology Graduate University Onna-sonOkinawa904-0395 Japan Department of Advanced Materials Science University of Tokyo Kashiwa277-8561 Japan Quantum-Phase Electronics Center Department of Applied Physics University of Tokyo Tokyo113-8656 Japan Department of Applied Physics University of Tokyo Hongo Tokyo113-8656 Japan Experimental Physics 5 Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg Augsburg86159 Germany Hungarian Academy of Sciences Premium Postdoctor Program Budapest1051 Hungary

The ultimate goal of multiferroic research is the development of new-generation non-volatile memory devices1, the so-called magnetoelectric (ME) memories, where magnetic bits are controlled via electric fields without the application of electrical currents subject to dissipation. This low-power operation exploits the entanglement of the magnetization and the electric polarization coexisting in multiferroic materials2,3. Here we demonstrate the optical readout of ME memory states in the antiferromagnetic (AFM) and antiferroelectric (AFE) LiCoPO4, based on the strong absorption difference of THz radiation between its two types of ME domains. This unusual contrast is attributed to the dynamic ME effect of the spin-wave excitations, as confirmed by our microscopic model, which also captures the characteristics of the observed static ME effect. Our proof-of-principle study, demonstrating the control and the optical readout of ME domains in LiCoPO4, lays down the foundation for future ME memory devices based on antiferroelectric-antiferromagnetic insulators. Copyright © 2017, The Authors. All rights reserved.

关键词： Digital storage

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Recent innovations in material research

Recent innovations in material research

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作者： Cai, W.J. Chen, D. Hu, H. Huang, X.P. Khotsyanovskii, A.O. Li, X.S. Silva, F.J.G. Yao, S.H. Zheng, H.N. Department of Chemical Materials and Biomolecular Engineering University of Connecticut United States School of Engineering and Applied Science Harvard University United States Department of Mechanical Automotive and Materials Engineering University of Windsor Canada Department of Mechanical Engineering Massachusetts Institute of Technology United States Pisarenko Institute of Problems of Strength National Academy of Sciences of Ukraine Ukraine Mechanical Engineering Department ISEP School of Engineering Polytechnic of Porto Portugal Bachelor Degree Program in Technology Management Chang Jung Christian University Taiwan

The new trends and developments in the novel functional materials and material research innovations presented at the 3rd Global Conference on Materials science and engineering (CMSE2014), which was held on 20-23 October 2014 in Shanghai, China, is discussed. R. Toyoda, M. Tawata, M. Hashimoto, and Y. Matsumura presented 'Internal stress control of transition-metal thin films', where the effects of ion bombardment parameter Pi on the internal stress of thin films were evaluated. X.G. Wang, Z.L. Chen, and X.Y. Wang presented their study 'Measurement of the interface characteristic based on ultrasonic longitudinal wave', which provided a lucrative alternative to conventional ultrasonic techniques, since it allows one to avoid the mutual superposition of reflected waves at the same thin coating interface. P. Wang and C.Y. Zhao presented their 'Study on reducing railway noise by porous concrete sound-absorbing panel', which is crucial for noise reduction near the railway lines. In the paper entitled 'Numerical study on the heat preservation of the ladle used for twin-roll strip casting', J.H. Dong, M. Chen and N. Wang developed a 3D mathematical model, in order to analyze the heat transfer and temperature drop on the ladle using the finite volume method.

关键词： Finite volume method

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Electrocatalysts: In Situ Electrochemical Activation of Atomic Layer Deposition Coated MoS2Basal Planes for Efficient Hydrogen Evolution Reaction (Adv. Funct. Mater. 34/2017)

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Advanced Functional Materials 2017年第34期27卷

作者： Youngmin Kim David H. K. Jackson Daewon Lee Min Choi Tae‐Wan Kim Soon‐Yong Jeong Ho‐Jeong Chae Hyun Woo Kim Noejung Park Hyunju Chang Thomas F. Kuech Hyung Ju Kim Carbon Resources Institute Korea Research Institute of Chemical Technology 141 Gajeong‐ro Yuseong‐gu Daejeon 34114 South Korea Materials Science Program University of Wisconsin‐Madison 1509 University Ave. Madison WI 53706 USA Center for Molecular Modeling and Simulation Korea Research Institute of Chemical Technology 141 Gajeong‐ro Yuseong‐gu Daejeon 34114 South Korea Department of Chemistry Ulsan National Institute of Science and Technology 50 UNIST‐gil Banyeon‐ri Eonyang‐eup Ulju‐gun Ulsan 44919 South Korea Department of Physics Ulsan National Institute of Science and Technology 50 UNIST‐gil Banyeon‐ri Eonyang‐eup Ulju‐gun Ulsan 44919 South Korea Department of Chemical and Biological Engineering University of Wisconsin‐Madison 1415 Engineering Dr. Madison WI 53706 USA Department of Green Chemistry and Biotechnology University of Science and Technology 113 Gwahangno Yuseong Daejeon 34113 South Korea

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Janus‐Membranen: Erforschung ihrer Dualität für hochentwickelte Stofftrennungen

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Angewandte Chemie 2016年第43期128卷

作者： Hao‐Cheng Yang Jingwei Hou Vicki Chen Zhi‐Kang Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou China UNESCO Centre for Membrane Science and Technology School of Chemical Engineering The University of New South Wales Sydney Australien

Janus‐Membranen sind eine neue Materialklasse mit “gegensätzlichen” Seiten, die selektive und oftmals neuartige Transportcharakteristiken zeigen. In diesem Kurzaufsatz schlagen wird eine Definition der Janus‐Membran vor, die über die Definition der Asymmetrie hinausgeht, und diskutieren gängige Herstellungsmethoden. Wir beschreiben aktuelle und potenzielle Anwendungen im gerichteten Stofftransport und in der schaltbaren Permeation und geben Hinweise zur Membranoptimierung mit detaillierten Mechanismen.

关键词： Hydrophober Effekt Grenzflächen Materialwissenschaften Membranen Oberflächenchemie

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Corrigendum to “Degradation of 1,4-dioxane from industrial wastewater by solar photocatalysis using immobilized NF-TiO 2 composite with monodisperse TiO 2 nanoparticles” [Appl. Catal. B: Environ. 180 (2016) 44–52]

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Applied Catalysis B: Environmental 2016年 196卷 232-232页

作者： Helen Barndõk Daphne Hermosilla Changseok Han Dionysios D. Dionysiou Carlos Negro Ángeles Blanco Department of Chemical Engineering Universidad Complutense de Madrid Avda. Complutense s/n 28040 Madrid Spain Environmental Engineering and Science Program Department of Biomedical Chemical and Environmental Engineering (DBCEE) University of Cincinnati Cincinnati OH USA

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Long afterglow green phosphors functionalized with Fe-N doped TiO2 for the photocatalytic removal of emerging contaminants

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chemical engineering Transactions 2015年 43卷 2107-2112页

作者： Sacco, Olga Vaiano, Vincenzo Han, Changseok Sannino, Diana Dionysiou, Dionysios D. Ciambelli, Paolo 84084 Italy Environmental Engineering and Science Program Department of Biomedical Chemical and Environmental Engineering University of Cincinnati CincinnatiOH1045221-0012 United States

ISBN: (纸本)9788895608341

The aim of this work was to remove oxytetracycline and atrazine using novel catalytic composites consisting of a visible light-active photocatalyst (Fe-N doped TiO2) supported on visible excited long afterglow aluminatebased phosphors (green phosphors) emitting around 500 nm of wavelength. In the long afterglow Fe-N doped TiO2phosphors composites, the light energy (emitted by the lamps used in the tests) is accumulated in phosphors, and then the accumulated light energy emits visible luminescence in dark, which is used as light source for the visible light-active Fe-N doped TiO2inf photocatalysis when the external lamps are turned off. Copyright © 2015, AIDIC Servizi S.r.l.

关键词： Titanium dioxide

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Li-doped ZnO nanoparticles as novel direct generator of singlet oxygen for potential photodynamic therapy applications

Li-doped ZnO nanoparticles as novel direct generator of sing...

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2015 MRS Spring Meeting

作者： Julca, Milton A. Martínez Rivera, Ivonnemary Perales-Pérez, Oscar Bailón, Sonia Pérez, Melina Department of Physics University of Puerto Rico Mayaguez Campus Puerto Rico Department of Chemical Engineering University of Puerto Rico Mayaguez Campus Puerto Rico Department of Engineering Science and Materials University of Puerto Rico Mayaguez Campus Puerto Rico Department of Chemistry University of Puerto Rico Ponce Puerto Rico Food Science and Technology Program University of Puerto Rico Mayaguez Puerto Rico

ISBN: (纸本)9781510826380

Photodynamic therapy (PDT) is an alternative to traditional cancer treatments. This approach involves the use of photosensitizer (PS) agents and their interaction with light. As a consequence, cytotoxic reactive oxygen species (ROS) are generated that, in turn will destroy tumors. On the other hand, ZnO is a biocompatible, nontoxic, and biodegradable material with the capability to generate ROS, specifically singlet oxygen (SO), which makes this material a promising candidate for 2-photon PDT. Doping ZnO with Li species is expected to induce defects in the host oxide structure mat favors the formation of trap states that should affect the electronic transitions related to the generation of SO. The present work reports the effect of the level of Lidoping on the ZnO structure and its capability to generate SO. Li-doped ZnO nanoparticles were synthesized under size-controlled conditions using a modified version of the polyol method. XRD measurements confirmed the development of well-crystallized ZnO Wurtzite;the average crystallite sizes ranged between 13.3nm and 14.2 nm, with an increase in Li content. The corresponding band gap energy values, estimated from UV-vis measurements, decreased from 3.33 to 3.25 eV. Photoluminescence (PL) measurements of Li-ZnO revealed the presence of emission peaks centered on 363nm, 390nm, and 556 nm;these emission peaks correspond to the exciton emission, transition of shallow donor levels near of the conduction band to valence band such as interstitial Zn, and oxygen vacancies, respectively. The observed increase of the emission intensity of the 390 nm emission peak, relative to the intensity of the main emission peak at 363 nm, was attributed to the promote of trap states due to interstitial Zn or Li-incorporation into the host oxide lattice. SO measurements evidenced the enhancing effect of the Li concentration on the capability of the doped ZnO to generate this species. This Li-dependence of SO generation can be attributed to the en

关键词： Photodynamic therapy

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Model-based On-Line Optimization Framework for Semi-batch Polymerization Reactors

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IFAC-PapersOnLine 2015年第8期48卷 164-169页

作者： Tae Y. Jung Yisu Nie J.H. Lee L.T. Biegler Biomolecular and Chemical Engineering Department (BK21 + Program) Korea Advanced Institute of Science and Technology Daejeon Korea The Dow Chemical Company Freeport TX 77541 USA Chemical Engineering Department Carnegie Mellon University Pittsburgh PA 15213 USA

Until recently, computational complexities and lack of detailed, nonlinear dynamic models have stood as main obstacles to widespread industrial adoption of model-based on-line optimization for operation of batch and semi-batch reactors. With recent advances in both dynamic modeling techniques and nonlinear programming (NLP) solvers, it is conceivable now to use significantly-sized, nonlinear models directly for on-line state/parameter estimation and optimal control calculations. In this study, we propose a framework for doing this. In the proposed framework, nonlinear first principles dynamic model-based optimizations are performed at several time points throughout a batch run over a fixed horizon, in order to estimate the current state of the model and to refine the target batch time and input variables. Here we combine shrinking horizon nonlinear model predictive control (sh-NMPC) with expanding horizon least squares estimation (eh-LSE). This framework is tested on a large-scale anionic propylene oxide (PO) polymerization process, whose operation considers not only certain end-product specifications but also safety constraints. It is shown that the proposed method is not only computationally feasible (averaging less than 10 CPU seconds at each sampling time) but leads to excellent performance, satisfying the product specification target despite initialization errors and measurement noise.

关键词： Nonlinear Model Predictive Control (NMPC) Least Square Estimation (LSE) Semi-batch process IPOPT On-line optimization

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Photonic Crystals: Light‐Patterned Crystallographic Direction of a Self‐Organized 3D Soft Photonic Crystal (Adv. Mater. 42/2017)

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Advanced Materials 2017年第42期29卷

作者： Zhi‐Gang Zheng Cong‐Long Yuan Wei Hu Hari Krishna Bisoyi Ming‐Jie Tang Zhen Liu Pei‐Zhi Sun Wei‐Qiang Yang Xiao‐Qian Wang Dong Shen Yannian Li Fangfu Ye Yan‐Qing Lu Guoqiang Li Quan Li Department of Physics East China University of Science and Technology Shanghai 200237 China Liquid Crystal Institute and Chemical Physics Interdisciplinary Program Kent State University Kent OH 44242 USA National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Visual and Biomedical Optics Lab Department of Ophthalmology and Visual Science and Department of Electrical and Computer Engineering Ohio State University Columbus OH 43212 USA

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