The Experts below are selected from a list of 3186 Experts worldwide ranked by ideXlab platform

Erkang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Point-of-Care Diagnoses: Flexible Patterning Technique for Self-Powered Wearable Sensors
    Analytical Chemistry, 2018
    Co-Authors: Xiaowei Zhang, Yin Jing, Qingfeng Zhai, Huanhuan Xing, Erkang Wang
    Abstract:

    This paper demonstrated the fabrication of a facile, low-cost, and self-powered platform for point-of-care fitness level and athletic performance monitoring sensor using electrochemical lithography method and its application in body fluid sensing. Flexible Au/prussian blue electrode was employed as the indicating electrode, where the color change was an indication of fitness level and athletic performance. A piece of Al foil, Au/multiwalled carbon nanotubes (MWCNTs)-glucose dehydrogenase, and Au/polymethylene blue-MWCNTs-lactic dehydrogenase electrodes were used for the detection of ionic strength, glucose, and lactic acid in sweat, respectively, which allows the sensor to work without any extra instrumentation and the output signal can be recognized by the naked eyes. The advantages of these sensors are (1) self-powered; (2) readily applicable to the detection of any electroactive substance by an Electrochromic Material; (3) easy to fabricate via two steps of EDP; and (4) point-of-care. By assembling the...

  • Point-of-Care Diagnoses: Flexible Patterning Technique for Self-Powered Wearable Sensors
    2018
    Co-Authors: Xiaowei Zhang, Yin Jing, Qingfeng Zhai, Huanhuan Xing, Erkang Wang
    Abstract:

    This paper demonstrated the fabrication of a facile, low-cost, and self-powered platform for point-of-care fitness level and athletic performance monitoring sensor using electrochemical lithography method and its application in body fluid sensing. Flexible Au/prussian blue electrode was employed as the indicating electrode, where the color change was an indication of fitness level and athletic performance. A piece of Al foil, Au/multiwalled carbon nanotubes (MWCNTs)-glucose dehydrogenase, and Au/polymethylene blue-MWCNTs-lactic dehydrogenase electrodes were used for the detection of ionic strength, glucose, and lactic acid in sweat, respectively, which allows the sensor to work without any extra instrumentation and the output signal can be recognized by the naked eyes. The advantages of these sensors are (1) self-powered; (2) readily applicable to the detection of any electroactive substance by an Electrochromic Material; (3) easy to fabricate via two steps of EDP; and (4) point-of-care. By assembling the energy and sensing components together through a transparent adhesive tape, the proposed self-powered wearable biosensor exhibits superior performances, indicating its broad applied prospect in the point-of-care diagnoses

  • bipolar electrode based reversible fluorescence switch using prussian blue au nanoclusters nanocomposite film
    Analytical Chemistry, 2017
    Co-Authors: Huanhuan Xing, Xiaowei Zhang, Qingfeng Zhai, Erkang Wang
    Abstract:

    A highly efficient fluorescence switch system based on a closed bipolar electrode (C-BPE) system was proposed for the first time. Here, Au nanoclusters (Au NCs) were premodified on one pole of the BPE and acted as the fluorescent donor. On the basis of the spectral overlap between the absorbance of Electrochromic Material-Prussian blue (PB) and the fluorescence spectrum of Au NCs, fluorescence quenching (“off” state) induced by the inner filter effect was observed. Due to the electrochemical reversible redox reaction between PB and Prussian white, switching the polarity of driving voltage could easily achieve the fluorescence recovery of the Au NCs, corresponding to the “on” state. Through the reasonable design of C-BPE and optimization of driving voltage, the on–off ratio of the integrated fluorescence switch was up to 2.7 and a good fatigue resistance while performing 10 on–off cycles was obtained owing to the good stability of Au NCs and the reversible redox feature of PB. The introduction of BPE made ...

  • A Renewable Display Platform Based on the Bipolar Electrochromic Electrode
    ChemElectroChem, 2015
    Co-Authors: Xiaowei Zhang, Changshuai Shang, Yong Xia, Erkang Wang
    Abstract:

    We report a renewable display platform based on bipolar electrochemistry that uses bipolar Electrochromic electrode (BP-EC-E) arrays for high-throughput screening applications. Prussian blue (or another Electrochromic Material) is electrodeposited on one end of the bipolar electrode (BPE) as the signal reporter, and the other end is for the loading of catalyst. Owing to the quantitative relation between the two reactions occurring at both ends of the BP-EC-E, the discoloration speeds (Prussian blue to Prussian white) are related to the amount or the catalytic activity of the catalysts. Interestingly, the established platform can be used repeatedly, owing to the reversibility of the Electrochromic reactions. With this strategy, we have achieved the fast imaging analysis of several electrocatalysts for methanol and ethanol oxidation.

Oliver G. Schmidt - One of the best experts on this subject based on the ideXlab platform.

  • Pairing of Luminescent Switch with Electrochromism for Quasi-Solid-State Dual-Function Smart Windows
    ACS applied materials & interfaces, 2018
    Co-Authors: Zhenguang Wang, Minshen Zhu, Siyu Gou, Zhou Pang, Yue Wang, Yang Huang, Qunhong Weng, Oliver G. Schmidt
    Abstract:

    Smart window is a promising green technology with feature of tunable transparency under external stimuli to manage light transmission and solar energy. However, more functions based on the intelligent management of the solar spectrum need to be integrated into present smart windows. In this work, a dual-function smart window is fabricated by pairing the luminescent switch with the Electrochromic window. The dual function is based on a single fluorine doped tin oxide coated glass functionalized with tungsten oxide and copper nanocluster, among which tungsten oxide serves as an Electrochromic Material and copper nanocluster provides photoinduced luminescence. Along with the regulation of the visible light based on the electrochromism of the window, the luminescence can be finely switched on and off, which establishes a pair of reversible states ("on" and "off") for the dual-function smart window. The contrast between two states reaches 88%. Furthermore, the manipulation of dual-function smart window is highly reversible with a short response time of 12.6 s. This prototype of dual-function smart window paves the way for developing multifunctional smart windows by integrating different functional Materials into one smart window based on the rational management of the solar spectrum.

  • Pairing of Luminescent Switch with Electrochromism for Quasi-Solid-State Dual-Function Smart Windows
    2018
    Co-Authors: Zhenguang Wang, Minshen Zhu, Siyu Gou, Zhou Pang, Yue Wang, Yang Huang, Qunhong Weng, Oliver G. Schmidt
    Abstract:

    Smart window is a promising green technology with feature of tunable transparency under external stimuli to manage light transmission and solar energy. However, more functions based on the intelligent management of the solar spectrum need to be integrated into present smart windows. In this work, a dual-function smart window is fabricated by pairing the luminescent switch with the Electrochromic window. The dual function is based on a single fluorine doped tin oxide coated glass functionalized with tungsten oxide and copper nanocluster, among which tungsten oxide serves as an Electrochromic Material and copper nanocluster provides photoinduced luminescence. Along with the regulation of the visible light based on the electrochromism of the window, the luminescence can be finely switched on and off, which establishes a pair of reversible states (“on” and “off”) for the dual-function smart window. The contrast between two states reaches 88%. Furthermore, the manipulation of dual-function smart window is highly reversible with a short response time of 12.6 s. This prototype of dual-function smart window paves the way for developing multifunctional smart windows by integrating different functional Materials into one smart window based on the rational management of the solar spectrum

Aline Rougier - One of the best experts on this subject based on the ideXlab platform.

  • Nano-particles (NPs) of WO3-type compounds by polyol route with enhanced Electrochromic properties
    Journal of Alloys and Compounds, 2020
    Co-Authors: Marie Bourdin, Christine Labrugère, Aline Rougier, Issam Mjejri, Thierry Cardinal, Younès Messaddeq, Manuel Gaudon
    Abstract:

    Tungsten trioxide, synthetized as nanoparticles (NPs), then shaped as thin or thick films, has attracted considerable attention as a typical Electrochromic Material. Herein, the synthesis of WO3 nanoparticles by the polyol process followed or not by heat-treatments under air or argon, has allowed us to compare the Electrochromic activity of powders with different morphologies and oxygen-deficiencies. Only the finest particles associated with pseudo-cubic structure due to a large oxygen-deficiency - on the contrary to the larger particles with standard monoclinic structure and W/O stoichiometric ratio - lead to films showing intense Electrochromic color change from a whitish (bleached state) to a dark blue (colored state). Additionally, the as-prepared films exhibit quite fast Electrochromic performance and satisfying cycling stability. The sub-stoichiometric nanoparticles prepared from polyol synthesis are of great potential for Electrochromic applications.

  • Toward simplified Electrochromic devices using silver as counter electrode Material
    ACS Applied Materials & Interfaces, 2019
    Co-Authors: Abdelaadim Danine, Cyril Faure, Laura Manceriu, Christine Labrugère, Nicolas Penin, Anastasia Delattre, Guy Eymin-petot-tourtollet, Aline Rougier
    Abstract:

    Novel design of Electrochromic devices (ECDs) known for their ability to modify optical properties under an applied voltage, based on a minimization of the number of layers is reported. The use of a metallic electrode, playing the role of both the conductive layer and the counter electrode, allows us to simplify the assembly of a commonly five-layer battery-type device to four-layer ECD. Further minimization of the number of layers is achieved using a conductive and Electrochromic Material. The novelty of the device configuration is illustrated using poly(3,4-ethylenedioxythiophene) (PEDOT)-based Materials as EC layer, lithium-based ionic liquid as electrolyte, and Ag as counter electrode. Such a four- or three-layer ECD deposited on paper substrate switches from light to deep blue in a narrow 0.7 V voltage window. Preliminary investigations of the mechanism indicate traces of Ag on the PEDOT layer upon cycling. Finally, the printed ECD is successfully activated using a mobile phone.

  • eco friendly redox mediator gelatin electrolyte for simplified tio2 viologen based Electrochromic devices
    Electrochimica Acta, 2017
    Co-Authors: Abdelaadim Danine, Laura Manceriu, A Fargues, Aline Rougier
    Abstract:

    Abstract In the present study, a novel gel electrolyte composition combining lithium iodide LiI in 1-butyl-3-methylimidazolium iodide (BMII) ionic liquid,triiodide I3-/I- redox mediator and biodegradable gelatin is proposed for Electrochromic devices (ECDs). More precisely, ECDs are assembled using viologen anchored − nanostructured TiO2 (deposited on FTO glass substrate by doctor blading at low temperature) as Electrochromic Material, FTO as counter-electrode and the gel electrolyte as redox mediator in between. Fast switching times and high cycling stability, up to 20000 cycles, are recorded. The optical reflectance modulation at 550 nm between white and blue color reaches a contrast value ΔR of about 19% in less than 4 seconds after 100 cycles.

  • Environmental assessment of electrically controlled variabale light transmittance devices
    RSC Advances, 2012
    Co-Authors: Uwe Posset, Aline Rougier, Matthias Harsch, Bettina Herbig, Gerhard Schottner, Gerhard Sextl
    Abstract:

    A comprehensive benchmark analysis has been performed on five electrically controlled state-of-the-art transmittance modulation devices including their production routes, from 'cradle-to-gate'. The benchmarks have been modeled employing the GaBi life cycle assessment software tool, which successfully yielded the most important environmental problem areas for the product life cycles of Electrochromic and electrotropic light-modulating devices. In terms of the energy demand of processing, all-solid-state technology was found to be less favorable than wet-chemical electrodeposition processes; however, the effect is interestingly overcompensated for by the resource depletion resulting from higher layer thicknesses in the latter case. As opposed to the mineral-glass based benchmarks, a plastic-film based system was particularly favorable, implying that the substrate is a factor with a strong environmental impact in transmittance modulation devices. Eventually, very high impacts were found for tin-doped indium oxide (ITO) and iridium oxide, i.e. a common transparent conductor and anodic Electrochromic Material, respectively. The results obtained support important current trends such as in-line manufacturing of Electrochromic devices, the quest for ITO replacement Materials, and, in general, the replacement of energy- and resource-intensive processes (sputter deposition of heavy metal oxides) by less demanding methods.

Chunye Xu - One of the best experts on this subject based on the ideXlab platform.

  • high performance black to transmissive Electrochromic device with panchromatic absorption based on tio2 supported viologen and triphenylamine derivatives
    Organic Electronics, 2016
    Co-Authors: Duo Weng, Jianming Zheng, Chunye Xu
    Abstract:

    Abstract A novel black-to-transmissive Electrochromic device based on TiO 2 -supported viologen and triphenylamine derivatives was designed and constructed via the absorption-complementary approach. In the device, cathodically coloring Electrochromic Material 1,4-bis[(( N -phosphono-2-ethyl)-4,4′-bipyridinium)-methyl]-benzene tetrachloride acted as working electrode and novel anodically coloring Electrochromic Material (4-((4-(dimethylamino)-phenyl)(4-methoxyphenyl)-amino)-benzyl) phosphonic acid acted as counter electrode. The assembled Electrochromic device achieved panchromatic absorption over entire visible spectrum with almost zero transmittance in colored state. The optical contrast (ΔT) of the device realized in this work was comparable to the highest value (60%) among all reported black-to-transmissive ECDs. Furthermore, excellent cycling stability was achieved, which maintained almost 80% of the initial ΔT value at 570 nm after continuous 100,000 switchings. These outstanding comprehensive Electrochromic performances potentially make this device a promising candidate for Electrochromic device applications.

  • flexible Electrochromic device based on poly 3 4 2 2 dimethylpropylenedioxy thiophene
    Electrochimica Acta, 2008
    Co-Authors: Minoru Taya, Chunye Xu
    Abstract:

    In this study, the design, fabrication and characterization of a flexible Electrochromic device based on indium tin oxide (ITO) coated polyethylene terephthalate (PET) plastic is discussed. The working Electrochromic Material film was poly (3,4-(2,2-dimethylpropylenedioxy)thiophene) (PProDOT-Me2), while the counter layer of the device was vanadium oxide titanium oxide (V2O5/TiO2) composite film, which serves as an ion storage layer. A solution type electrolyte was used as the ionic transport layer and was sandwiched between the working and counter layers. The device exhibited tuneable light transmittance between transparent and deep blue color, with a maximum contrast ratio at 580 nm wavelength. Other important properties, such as switching speed, life time, and coloration efficiency have been improved.

Jim Yang Lee - One of the best experts on this subject based on the ideXlab platform.

  • plasmonic oxygen deficient tio2 x nanocrystals for dual band Electrochromic smart windows with efficient energy recycling
    Advanced Materials, 2020
    Co-Authors: Shengliang Zhang, Sheng Cao, Tianran Zhang, Jim Yang Lee
    Abstract:

    Dual-band Electrochromic smart windows capable of the spectrally selective modulation of visible (VIS) light and near-infrared (NIR) can regulate solar light and solar heat transmittance to reduce the building energy consumption. The development of these windows is however limited by the number of available dual-band Electrochromic Materials. Here, plasmonic oxygen-deficient TiO2-x nanocrystals (NCs) are discovered to be an effective single-component dual-band Electrochromic Material, and that oxygen-vacancy creation is more effective than aliovalent substitutional doping to introduce dual-band properties to TiO2 NCs. Oxygen vacancies not only confer good near-infrared (NIR)-selective modulation, but also improve the Li+ diffusion in the TiO2-x host, circumventing the disadvantage of aliovalent substitutional doping with ion diffusion. Consequently optimized TiO2-x NC films are able to modulate the NIR and visible light transmittance independently and effectively in three distinct modes with high optical modulation (95.5% at 633 nm and 90.5% at 1200 nm), fast switching speed, high bistability, and long cycle life. An impressive dual-band Electrochromic performance is also demonstrated in prototype devices. The use of TiO2-x NCs enables the assembled windows to recycle a large fraction of energy consumed in the coloration process ("energy recycling") to reduce the energy consumption in a round-trip Electrochromic operation.

  • al3 intercalation de intercalation enabled dual band Electrochromic smart windows with a high optical modulation quick response and long cycle life
    Energy and Environmental Science, 2018
    Co-Authors: Shengliang Zhang, Sheng Cao, Tianran Zhang, Adrian C Fisher, Jim Yang Lee
    Abstract:

    Dual-band Electrochromic smart windows with independent control of the transmittance of near-infrared (NIR) and visible (VIS) light can contribute significantly to the reduction of building energy consumption. Cost and inadequate Electrochromic performance are the current technical challenges. We present here a dual-band Electrochromic smart window design based on the intercalation/de-intercalation of Al3+ cations to replace the common use of monovalent cations in Electrochromic applications. The Al3+ intercalation/de-intercalation-enabled Electrochromic smart window delivers not only efficient and independent control of NIR and VIS light transmittance, but also impressive Electrochromic performance – a high optical modulation of the full solar spectrum (93.2%, 91.7%, 88.5%, and 86.8% at 633, 800, 1200, and 1600 nm, respectively), high coloration efficiencies (254 and 121 cm2 C−1 at 1200 and 633 nm, respectively), fast switching times (8/5 s and 16/13 s at 1200 and 633 nm, respectively, for coloration/bleaching), and high bistability and cyclability (a 5.5% capacity loss after 2000 cycles). The good Electrochromic performance can be attributed to the effective diffusion of Al3+ in the Electrochromic Material (as good as that of Li+); and a shallow intercalation/de-intercalation depth enabled by the ability of Al3+ to support three-electron redox reactions. The performance of Al3+ intercalation/de-intercalation-enabled dual-band electrochromism was also verified in laboratory prototype devices to confirm its suitability for dual-band smart windows.