Charge transport processes in conducting polypyrrole/Prussian Blue bilayers
TL;DR: In this article, the electronic transport properties of electrochemically deposited conducting polypyrrole (PPy)/Prussian Blue (PB) bilayer films have been studied by investigating the currentvoltage (I-V) characteristics in dark and under white light illumination.
About: This article is published in Materials Chemistry and Physics.The article was published on 2002-07-28. It has received 28 citations till now. The article focuses on the topics: Prussian blue & Space charge.
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TL;DR: V vibrational population lifetimes for Prussian blue and ruthenium purple nanoparticles produced and characterized in AOT reverse micelles are determined to be 32 ± 4 ps for PB and 44 ± 14 ps for RP, consistent with rapid (<1 ps) BET resulting in population in the ground electronic state with vibrational excitation in the CN mode.
Abstract: Transient infrared and visible absorption studies have been used to characterize vibrational and electronic dynamics of Prussian blue (PB) and ruthenium purple (RP) nanoparticles produced and characterized in AOT reverse micelles. Studies include excitation and probing with both infrared (near 2000 cm−1) and visible (800 nm) pulses. From IR pump–IR probe measurements of the CN stretching bands, vibrational population lifetimes are determined to be 32 ± 4 ps for PB and 44 ± 14 ps for RP. These times are longer than those for ferrocyanide (4 ps) and ruthenocyanide (4 ps) in normal water and are closer to the times for these species in heavy water (25–30 ps) and for ferrocyanide in formamide (43 ps). The PB and RP lifetimes are also longer than those (<15 ps) previously measured for CN stretching bands following intervalence excitation and back-electron transfer (BET) for dinuclear mixed-valence compounds containing Fe, Ru, and Os in heavy water and formamide [A. V. Tivansky, C. F. Wang, and G. C. Walker, J....
17 citations
TL;DR: In this article, an ionic transport for electrochromic polymer films, employed as display elements, smart windows, and the base material for electrochemical electronic devices, was proposed.
Abstract: Electrochromic polymer films, employed as display elements, smart windows, and the base material for electrochemical electronic devices, can be addressed solely through ionic transport via an elect ...
15 citations
TL;DR: Methylene blue (MB) at small concentration is used as a photosensitizer in the solid state photoelectrochemical cells fabricated using doped and undoped polypyrrole (Ppy) coated electrodes sandwiched with solid polymer electrolyte (SPE) viz. polyvinyl alcohol (PVA) doped with phosphoric acid as discussed by the authors.
15 citations
TL;DR: In this paper, it was observed that a p-n junction is formed at the PANI/dye interface, and the effect of light current on the potential barrier in the presence of light was investigated.
Abstract: Rhodamine 6G (R6G), an n-type dye, has been employed at small concentrations (0–15 mM/monomer) for sensitizing conducting polyaniline (PANI) in solid-state photocells with the configuration Au/PANI/SPE+R6G/ITO. It is observed that a p–n junction is formed at the PANI/dye interface. The photosensitivity factor (S) is observed to be maximum at a dye concentration of 6.3 mM/monomer. The variation of the dark (Id) and light (Il) current with respect to the dye concentration in the linear portion of the current–voltage (I–V) characteristic reveals that light current goes through a maximum whereas dark current remains more or less constant. Thus, it is the variation of the light current (Il) that is more important and is one of the reasons for maximum photosensitivity at a certain dye concentration. The mechanism of the dye-sensitization process is explained on the basis of the energy band diagram of the materials forming the photocell. The observed photosensitivity is due to the lowering of the potential barrier in the presence of light at the PANI/dye interface.
13 citations
TL;DR: In this article, the authors discuss the literature concerning ultrafast photoinduced dynamics in Prussian blue analogues (PBAs), which are molecule-based magnets, and the literature and themes covered in this review are of relevance for ultrafast optical control of new multifunctional materials.
Abstract: New magnetic materials and methods for controlling them are needed to improve data storage technologies. Recent progress has enabled optical detection and manipulation of spins in molecule-based magnets on the femtosecond timescale, which is promising for both increasing the read/write speed but also the data storage density. Experimental developments in femtosecond X-ray free-electron lasers (XFELs) and magneto-optics, in combination with theory advances, have opened up several new avenues to investigate molecule-based magnets. This review discusses the literature concerning ultrafast photoinduced dynamics in Prussian blue analogues (PBAs), which are molecule-based magnets. In PBAs spin–flips and lattice distortions can happen on the 100 fs timescale, which in some analogues lead to photoinduced changes in the long-range magnetic order. The literature and themes covered in this review are of relevance for ultrafast optical control of new multifunctional materials.
12 citations
References
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TL;DR: In this article, a stable organic electroluminescent devices based on vapor-deposited Alq thin films have been achieved, which are derived from several factors including: (1) a multilayer thin-film structure with a CuPc stabilized hole-injection contact, (2) a hole-transport diamine layer using a naphthyl substituted benzidine derivative, and (3) an ac drive wave form.
Abstract: Highly stable organic electroluminescent devices based on vapor‐deposited Alq thin films have been achieved. The improvement in stability is derived from several factors including: (1) a multilayer thin‐film structure with a CuPc stabilized hole‐injection contact, (2) a hole‐transport diamine layer using a naphthyl‐substituted benzidine derivative, and (3) an ac drive wave form. These emissive devices have shown an operational half‐lifetime of about 4000 h from an initial luminance of 510 cd/m2.
1,559 citations
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TL;DR: In this article, electrical and electrochemical properties of ion conducting polymers are discussed. But they do not consider the properties of polymers with polymer electrolytes, as they do in this paper.
Abstract: Preface. Electrical and electrochemical properties of ion conducting polymers. Electrical and electrochemical properties of electronically conducting polymers. Highly-conductive polymer electrolytes. Solvation mechanisms in low molecular weight polyethers. Lithium batteries with polymer electrodes. Lithium polymer batteries. Electrochromic devices. Laminated electrochromic displays and windows. Functionalized conductive polymer membranes/films. Electroactive polymers in chemical sensors.
824 citations
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TL;DR: The most advanced organic light emitting diode (LED) technology has reached a point where performance levels are adequate for a number of applications as discussed by the authors, and a review examines the key scientific issues that underlie the operation of such LEDs.
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