Author
Yumei Kong
Bio: Yumei Kong is an academic researcher from Northeast Normal University. The author has contributed to research in topics: Electrochromism & Nanorod. The author has an hindex of 7, co-authored 8 publications receiving 142 citations.
Topics: Electrochromism, Nanorod, Isostructural
Papers
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TL;DR: In this article, a layer-by-layer (LBL) assembly method was used for the fabrication of multiple colored electrochromic multilayer films consisting of molybdenum-doped hexagonal tungsten bronze formulated as Na0.2MoxW1−xO3·ZH2O.
Abstract: The creation of new materials for lightweight and high performance displays is an extremely active research field. Inorganic electrochromic ultra-thin film displays possess a keen advantage over other technologies because of their multiple color, fast switching, improved durability, high contrast, high coloration efficiency and low cost. Here we present the successful fabrication of multiple colored electrochromic multilayer films consisting of molybdenum-doped hexagonal tungsten bronze formulated as Na0.2MoxW1−xO3·ZH2O (x
= 0.05)
(Mo0.05–HTB), using a layer-by-layer (LBL) assembly method. The resultant organic–inorganic films exhibit a linear increase in film thickness with assembly progressing. The color and electrochromic contrast of the films are adjustable by changing the mole ratio of Mo to W. Electrochromic contrast, coloration efficiency, switching speed, stability and optical memory for the as-prepared films were carefully investigated. The Mo–HTB/polyethyleneimine films undergo a color transition from colorless to light blue, and finally to dark blue over the potential range from −1.0 to 1.0 V vs Ag/AgCl reference electrode. These results exhibit the validation of an LBL-assembly based intermixing strategy for the design of multiple-hue electrochromic films.
31 citations
TL;DR: In this article, three nanorod-amino acid phosphomolybdates (nanorodAA-PMo 12 ) were prepared by the solvent-thermo technique, using reverse micelles as a template, and characterized by transmission electron microscopy (TEM), FT-IR spectroscopy, XRD, cyclic voltammetry (CV), elemental analysis and thermogravimetric analysis (TGA).
28 citations
TL;DR: The discovered tubular structure of the polyoxometalate is believed to be promising for use in templates, as a precursor of tungsten oxide ceramic microtubes, and for other uses associated with tubular structures.
Abstract: Microtubes of α-K4SiW12O40 with the length around 1 cm and inner diameter and wall thickness in the ranges of 7−55 μm and 3−15 μm, respectively, were copiously fabricated by a one-step, template-free aqueous synthesis. The formation mechanism is discussed. The discovered tubular structure of the polyoxometalate is believed to be promising for use in templates, as a precursor of tungsten oxide ceramic microtubes, and for other uses associated with tubular structures.
22 citations
TL;DR: In this article, the selective controlled synthesis of crystalline CoMoO4 nanorods (rod-CoMoO 4)/nanowhiskers (whiskers-coMO4) by using reverse micelles in different molar ratios (w) of [H2O]/[CTAB] under mild hydrothermal conditions is reported for the first time.
19 citations
TL;DR: In this article, two new inorganic-organic hybrid polyoxovanadates, [Cu(2,2′-bipy)3]2]2[H4V16O38(Cl)]·4H2O 1 and [CU(2.2′)-Bipy 3]3]3[V15O36(Cl)], were synthesized under the same reaction condition but in different pH range.
18 citations
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TL;DR: Transparent conductors (TCs) have a multitude of applications for solar energy utilization and for energy savings, especially in buildings as discussed by the authors, which leads naturally to considerations of spectral selectivity, angular selectivity, and temporal variability of TCs, as covered in three subsequent sections.
1,471 citations
TL;DR: Functionalization via covalent grafting of organic functions allows to tune the redox and acid-base properties, and the solubility of polyoxometalates, to enhance their stability and biological activity and to reduce their toxicity.
799 citations
TL;DR: The state of the art of electrochemical devices based on layer-by-layer (LbL) assemblies is described in this paper, with a focus on supercapacitors, biosensors, and electroresponsive LbL such as electrodissolution/electroswelling of coatings.
265 citations
TL;DR: The LbL technique, which is based upon the alternate adsorption of oppositely charged species from aqueous solution, possesses unprecedented control of materials selection, materials properties, properties and architecture, and architecture.
Abstract: With an ever-increasing need for thin, flexible and functional materials in electrochemical systems, the layer-by-layer (LbL) technique provides a simple and affordable route in creating new, active electrodes and electrolytes. The LbL technique, which is based upon the alternate adsorption of oppositely charged species from aqueous solution, possesses unprecedented control of materials selection (e.g. polyelectrolytes, clays, nanoparticles, proteins), materials properties (e.g. conductivity, glass-transition temperature) and architecture (e.g. blends, stratified-layers, pores). These advantages make LbL assemblies excellent candidates for use in proton-exchange membrane and direct methanol fuel-cells, batteries, electrochromic devices, solar cells, and sensors. This review addresses the design of LbL films for electrochemical systems and recent progress.
263 citations
TL;DR: This Feature Article focuses on the antibacterial activity of POMs and POM-based hybrid and nanocomposite structures highlighting recent advances in the synthesis of biologically active POM systems and providing the state of the art in this research field.
252 citations