The Experts below are selected from a list of 52941 Experts worldwide ranked by ideXlab platform
Jinsang Kim - One of the best experts on this subject based on the ideXlab platform.
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Recent advances in fluorescent and colorimetric Conjugated Polymer-based biosensors
Analyst, 2010Co-Authors: Kangwon Lee, Laura K. Povlich, Jinsang KimAbstract:Conjugated Polymers recently have drawn much attention as an emerging sensory material due to their meritorious signal amplification, convenient optical detection, readily tunable properties, and easy fabrication. We review the molecular design principles of sensory Conjugated Polymer recognition events, which can trigger conformational change of the Conjugated Polymer, induce intermolecular aggregation, or change the distance between the Conjugated Polymer as an energy donor and the reporter dye molecule as an energy acceptor. These recognition/detection mechanisms result in mainly three types of measurable signal generation: turn on or turn off fluorescence, or change in either visible color or fluorescence emission color of the Conjugated Polymer. In this article, we highlight recent advances in fluorescent and colorimetric Conjugated Polymer-based biosensors.
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Signal-amplifying Conjugated Polymer-DNA hybrid chips.
Angewandte Chemie, 2007Co-Authors: Kangwon Lee, Jean Marie Rouillard, Trinh Pham, Erdogan Gulari, Jinsang KimAbstract:Bio-/synthetic hybrid materials have recently received considerable attention owing to their potential biomedical applications. The most reliable way of identifying any biological target is through its genetic code. However, the current commercial DNA microarray requires costly and time-consuming PCR to multiply the number of analyte DNA molecules and label the analyte DNA with a fluorescent dye because of the low detection limit. In this context, devising self-signal-amplifying DNA microarrays can realize low-cost, fast, and reliable detection of nucleic acids. Herein, we report signal-amplifying DNA chips fabricated by on-chip DNA synthesis on a thin film of a newly developed Conjugated Polymer (Figure 1 and the chemical structure in Figure 2a).
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Flexible Conjugated Polymer photovoltaic cells with controlled heterojunctions fabricated using nanoimprint lithography
Applied Physics Letters, 2007Co-Authors: Myung Su Kim, Jinsang Kim, Jae Cheol Cho, Max Shtein, Jin Sung Kim, L. Jay GuoAbstract:The authors describe Conjugated Polymer-based photovoltaic devices in which the shape and area of the interface between the electron donor and acceptor layers were controllably varied using nanoimprint lithography. The short circuit current is shown to increase with the interfacial area of the heterojunction, without affecting the open circuit voltage. The fill factor and power conversion efficiency are also shown to increase with donor-acceptor interfacial area.
Jan C Hummelen - One of the best experts on this subject based on the ideXlab platform.
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accurate measurement of the exciton diffusion length in a Conjugated Polymer using a heterostructure with a side chain cross linked fullerene layer
Journal of Physical Chemistry A, 2005Co-Authors: D E Markov, Paul W. M. Blom, Emiel Amsterdam, And Alexander B Sieval, Jan C HummelenAbstract:Exciton diffusion and photoluminescence quenching in Conjugated Polymer/fullerene heterostructures are studied by time-resolved photoluminescence. It is observed that heterostructures consisting of...
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accurate efficiency determination and stability studies of Conjugated Polymer fullerene solar cells
Thin Solid Films, 2002Co-Authors: J M Kroon, M Martijn M Wienk, Wiljan Verhees, Jan C HummelenAbstract:We report on an accurate indoor determination of the power conversion efficiency under standard test conditions w1000 Wy m, 2 AM1.5 global (IEC 904-3) ,2 58Cx for an organic photovoltaic device based on a bulk heterojunction of a Conjugated Polymer and a methanofullerene. AM1.5 efficiencies up to 2.55% are achieved for cell areas F1.0 cm . Systematic stability studies on 2
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tracing photoinduced electron transfer process in Conjugated Polymer fullerene bulk heterojunctions in real time
Chemical Physics Letters, 2001Co-Authors: Christoph J. Brabec, Gerald Zerza, G Cerullo, Sandro De Silvestri, Silvia Luzzati, Jan C Hummelen, Serdar SariciftciAbstract:Abstract Ultrafast spectroscopic studies using an optical excitation of a Conjugated Polymer by sub-10-fs pulses are reported. Phonon modes which are strongly coupled to the electronic excitation of the Conjugated Polymer are directly observed as coherent oscillations during the pump–probe experiment, mirroring the resonant/nonresonant Raman spectrum of the Conjugated Polymer. In composites of a Conjugated Polymer with a fullerene the primary photoexcitation is found to be an ultrafast photoinduced electron transfer. We are able to time resolve for the first time the kinetics of this charge transfer process with a forward transfer time of around τ ct ∼45 fs.
Jianhui Hou - One of the best experts on this subject based on the ideXlab platform.
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Conjugated Polymer Photovoltaic Materials
Lecture Notes in Chemistry, 2015Co-Authors: Jianhui HouAbstract:During the past few decades, Conjugated Polymers with various molecular structures have been explored for applications in Polymer solar cells (PSCs). In this chapter, an overview of Conjugated Polymer photovoltaic materials is given to provide insights for molecular design and fine-tuning of high-performance photovoltaic Polymers. First, we briefly summarize and provide design considerations of Conjugated Polymer photovoltaic materials. Second, representative photovoltaic Polymers are introduced. Third, representative Conjugated Polymer acceptor materials are briefly introduced and discussed.
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pbdtttz a broad band gap Conjugated Polymer with high photovoltaic performance in Polymer solar cells
Macromolecules, 2011Co-Authors: Lijun Huo, Xia Guo, Shaoqing Zhang, Jianhui HouAbstract:PBDTTTZ: A Broad Band Gap Conjugated Polymer with High Photovoltaic Performance in Polymer Solar Cells Lijun Huo, Xia Guo, Shaoqing Zhang, Yongfang Li,* and Jianhui Hou* State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Klaus Müllen - One of the best experts on this subject based on the ideXlab platform.
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Integrated circuits based on Conjugated Polymer monolayer
Nature communications, 2018Co-Authors: Deepthi Kamath Mangalore, Jingbo Zhao, Joshua H. Carpenter, Hongping Yan, Harald Ade, He Yan, Klaus Müllen, Paul W. M. Blom, Wojciech PisulaAbstract:It is still a great challenge to fabricate Conjugated Polymer monolayer field-effect transistors (PoM-FETs) due to intricate crystallization and film formation of Conjugated Polymers. Here we demonstrate PoM-FETs based on a single monolayer of a Conjugated Polymer. The resulting PoM-FETs are highly reproducible and exhibit charge carrier mobilities reaching 3 cm2 V-1 s-1. The high performance is attributed to the strong interactions of the Polymer chains present already in solution leading to pronounced edge-on packing and well-defined microstructure in the monolayer. The high reproducibility enables the integration of discrete unipolar PoM-FETs into inverters and ring oscillators. Real logic functionality has been demonstrated by constructing a 15-bit code generator in which hundreds of self-assembled PoM-FETs are addressed simultaneously. Our results provide the state-of-the-art example of integrated circuits based on a Conjugated Polymer monolayer, opening prospective pathways for bottom-up organic electronics.
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exciton diffusion and dissociation in Conjugated Polymer fullerene blends and heterostructures
Physical Review B, 1999Co-Authors: A Haugeneder, Ullrich Scherf, M Neges, C Kallinger, Wolfgang Spirkl, Uli Lemmer, Jochen Feldmann, Eva Harth, Andreas Gugel, Klaus MüllenAbstract:We investigate the exciton dynamics in composite systems of Conjugated Polymers and fullerene molecules by photoluminescence ~PL! and femtosecond transient absorption experiments. In solid mixtures ~blends! we find a strong concentration-dependent quenching of the Polymer PL. This is attributed to an efficient electron transfer ~ET! from the photoexcited Conjugated Polymer to the fullerene. The ET dynamics is directly monitored by measuring the transient stimulated emission of the Conjugated Polymer. The transfer rate depends linearly on the C60 concentration and ranges between (66 ps) 21 and (5 ps) 21 for concentrations from 0.5% to 5%. This dependence is in accordance with an exciton diffusion process occurring prior to the ET. The exciton diffusion length in the Conjugated Polymer is directly determined by measuring the PL quenching in welldefined heterostructures comprising a self-assembled fullerene monolayer and a thin spin-coated Polymer layer of variable thickness. From these measurements we infer a value of 14 nm for the exciton diffusion length in ladder-type poly ~p-phenylene!. Our results are of direct relevance for further optimization of Polymer photovoltaic devices. @S0163-1829~99!07923-0#
Gareth Redmond - One of the best experts on this subject based on the ideXlab platform.
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microcavity effects and optically pumped lasing in single Conjugated Polymer nanowires
Nature Nanotechnology, 2007Co-Authors: Deirdre M Ocarroll, Ingo Lieberwirth, Gareth RedmondAbstract:Conjugated Polymers have chemically tuneable opto-electronic properties and are easily processed, making them attractive materials for photonics applications1,2. Conjugated Polymer lasers, in a variety of resonator geometries such as microcavity3, micro-ring4, distributed feedback5 and photonic bandgap6 structures, have been fabricated using a range of coating and imprinting techniques. Currently, one-dimensional nanowires are emerging as promising candidates for integrated, subwavelength active and passive photonic devices7,8,9,10. We report the first observation of optically pumped lasing in single Conjugated Polymer nanowires. The waveguide and resonator properties of each wire are characterized in the far optical field at room temperature. The end faces of the nanowire are optically flat and the nanowire acts as a cylindrical optical cavity, exhibiting axial Fabry–Perot mode structure in the emission spectrum. Above a threshold incident pump energy, the emission spectrum collapses to a single, sharp peak with an instrument-limited line width that is characteristic of single-mode excitonic laser action.