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Electrochromic Materials (electrochromic + material)
Selected AbstractsHexyl-Derivatized Poly(3,4-ethylenedioxyselenophene): Novel Highly Stable Organic Electrochromic Material with High Contrast Ratio, High Coloration Efficiency, and Low-Switching VoltageADVANCED MATERIALS, Issue 17 2009Mao Li A novel family of electrochromic materials has been discovered. The electropolymerized poly(hexyl-3,4-ethylenedioxyselenophene) film switches color between a highly absorbing pure blue and a nearly colorless bleached state, achieves both a high contrast ratio of 88,89% and a high CE of up to 773,cm2 C,1 while showing a fast switching time and remarkable stability with the contrast ratio remaining 48% after 10000 cycles. [source] Metallo-Supramolecular Polymers Based on Functionalized Bis-terpyridines as Novel Electrochromic Materials,ADVANCED MATERIALS, Issue 22 2007S. Han Self-assembly of various metallo-supramolecular coordination polyelectrolytes (MEPEs) based on pyridine ring functionalized ditopic bis-terpyridines, as well as the electrochromic property is presented. MEPEs derived from electron-donating OMe functionalized ligands exhibit rapid switching rates, good reversibility, high stability, and an optical memory. The first structure-property relationships are proposed, which are needed for the de novo design and fabrication of new materials. [source] Electropolymerization and Electrochromic Properties of Poly(3-bromothiophene) Films on a Transparent Nano-mesoporous TiO2 SurfaceCHINESE JOURNAL OF CHEMISTRY, Issue 11 2008He XU A novel method for electrodeposition of poly(3-bromothiophene) film onto nano- and mesoporous TiO2 film was developed. The PBrT/TiO2 exhibited excellent electrochromic properties with good coloration efficiency and high chromatic contrast, which could be a commercially promising electrochromic material. [source] Hexyl-Derivatized Poly(3,4-ethylenedioxyselenophene): Novel Highly Stable Organic Electrochromic Material with High Contrast Ratio, High Coloration Efficiency, and Low-Switching VoltageADVANCED MATERIALS, Issue 17 2009Mao Li A novel family of electrochromic materials has been discovered. The electropolymerized poly(hexyl-3,4-ethylenedioxyselenophene) film switches color between a highly absorbing pure blue and a nearly colorless bleached state, achieves both a high contrast ratio of 88,89% and a high CE of up to 773,cm2 C,1 while showing a fast switching time and remarkable stability with the contrast ratio remaining 48% after 10000 cycles. [source] Current-sensing scanning near-field optical microscopy using a metal probe for nanometre-scale observation of electrochromic filmsJOURNAL OF MICROSCOPY, Issue 3 2003F. Iwata Summary A novel technique for scanning near-field optical microscopy capable of point-contact current-sensing was developed in order to investigate the nanometre-scale optical and electrical properties of electrochromic materials. An apertureless bent-metal probe was fabricated in order to detect optical and current signals at a local point on the electrochromic films. The near-field optical properties could be observed using the local field enhancement effect generated at the edge of the metal probe under p -polarized laser illumination. With regard to electrical properties, current signal could be detected with the metal probe connected to a high-sensitive current amplifier. Using the current-sensing scanning near-field optical microscopy, the surface topography, optical and current images of coloured WO3 thin films were observed simultaneously. Furthermore, nanometre-scale electrochromic modification of local bleaching could be performed using the current-sensing scanning near-field optical microscopy. The current-sensing scanning near-field optical microscopy has potential use in various fields of nanometre-scale optoelectronics. [source] Novel thermally stable poly(amine hydrazide)s and poly(amine-1,3,4-oxadiazole)s for luminescent and electrochromic materialsJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 15 2005Guey-Sheng Liou Abstract We describe the preparation, characterization, and luminescence of four novel electrochromic aromatic poly(amine hydrazide)s containing main-chain triphenylamine units with or without a para-substituted N,N -diphenylamino group on the pendent phenyl ring. These polymers were prepared from either 4,4,-dicarboxy-4,- N,N -diphenylaminotriphenylamine or 4,4,-dicarboxytriphenylamine and the respective aromatic dihydrazide monomers via a direct phosphorylation polycondensation reaction. All the poly(amine hydrazide)s were amorphous and readily soluble in many common organic solvents and could be solution-cast into transparent and flexible films with good mechanical properties. These poly(amine hydrazide)s exhibited strong ultraviolet,visible absorption bands at 346,348 nm in N -methyl-2-pyrrolidone (NMP) solutions. Their photoluminescence spectra in NMP solutions or as cast films showed maximum bands around 508,544 and 448,487 nm in the green and blue region for the two series of polymers. The hole-transporting and electrochromic properties were examined by electrochemical and spectroelectrochemical methods. All obtained poly(amine hydrazide)s and poly(amine-1,3,4-oxadiazole)s exhibited two reversible oxidation redox couples at 0.8 and 1.24 V vs. Ag/AgCl in acetonitrile solution and revealed excellent stability of electrochromic characteristics, changing color from original pale yellow to green and then to blue at electrode potentials of 0.87 and 1.24 V, respectively. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 3245,3256, 2005 [source] | ||||||||||