Optimization of Transition Metal Oxide Thin Films of WO3 and V2O5 for Electrochromic and Gasochromic Applications in Smart Windows PDF Download
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Author: Hussein S. Shanak
Publisher:
ISBN:
Category :
Languages : en
Pages : 244
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Book Description
Author: Hussein S. Shanak
Publisher:
ISBN:
Category :
Languages : en
Pages : 244
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Author: Kantisara Pita
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Yi Long
Publisher: CRC Press
ISBN: 1000393577
Category : Science
Languages : en
Pages : 416
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Book Description
The usage of building energy accounts for 30–40% of total energy consumption in developed countries, exceeding the amount for industry or transportation. Around 50% energy for building services is contributed by heating, ventilation, and air-conditioning (HVAC) systems. More importantly, both building and HVAC energy consumptions are predicted to increase in the next two decades. Windows are considered as the least energy-efficient components of buildings. Therefore, smart windows are becoming increasingly important as they are capable of reducing HVAC energy usage by tuning the transmitted sunlight in a smart and favoured way: blocking solar irradiation on hot days, while letting it pass through on cold days. Compared with other type of smart windows, thermochromic windows have the unique advantages of cost-effectiveness, rational stimulus, and passive response. This book covers fabrication of vanadium dioxide–based smart windows, discusses various strategies to enhance their performance, and shares perspectives from the top scientists in this particular field.
Author: Delphine Malarde
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Raghunath S. Patil
Publisher: LAP Lambert Academic Publishing
ISBN: 9783844334876
Category :
Languages : en
Pages : 196
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Book Description
Electrochromics is a healthy blend of basic physics and chemistry, thin film science, device technology and market opportunities. Use of electrochromic (EC) materials as smart windows in an interactive architecture of buildings provide a better option for energy saving. Hence developments in electrochromics will remain a vital field for endeavors of various kinds in coming years. Molybdnum oxide (MoO3) shows pronounced electrochromism due to its interesting structural(provides conduits for intercalation/deintercalation) and electronic properties. It is a 4d transition metal oxide, which can be switched between two different optical states (transparent and colored) by Photochromic, Thermochromic or Electrochromic effect. This book presents a novel route of cathodic electrodeposition of hydrous MoO2 thin films and their thermal oxidation to obtain electrochromic MoO3 thin films. The fundamentals of Electro-deposition and material formation are discussed at length. structural, optical and electrochromic properties are studied and reasons for enhancement in Electrochromic parameters on the basis of proposed theories is discussed at length.
Author: Oladeji Taiwo Fadayomi
Publisher:
ISBN:
Category : Chemical vapor deposition
Languages : en
Pages : 148
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Book Description
My aim was to see how differently the structure of the films behave during insertion and extraction of ions and electrons. Tungsten trioxide (WO3) has emerged as one of the most widely used transition metal oxides in fabrication of electrochromic devices. Another material that was studied extensively in this context is MoO3. Previous studies have shown limitations in the number of repeated cycles that can be obtained using WO3 and MoO3 films. To further improve on this, I used lesser concentrations of hydrochloric acid (HCl) as the electrolyte in the device fabrication. HCl (0.02 N and 0.05N) were used on amorphous and crystalline WO3, MoO3, and hybrid samples having layers of both compounds. The WO3 and MoO3 thin films deposited at 450̊°C were characterized using both XRD and Raman spectroscopy and found to be monoclinic and orthorhombic in structure. Cyclic voltammetry experiments were performed on all samples and their bleaching and coloration cycles observed. It was determined that the bias potential required to cause ion insertion depended on the concentration of the HCl, so also does the optical properties of the sample. A potential range of -1.5 V to -3.0 V was used during cyclic voltammetry experiment. The coloration in WO3 and MoO3 is a structure-sensitive phenomenon, and excess electrons can be either localized or delocalized. A UV-visible technique was then used to measure the transmittance and intensity of the films before and at different stages of applied potentials during the course of the experiments. The performances of WO3 deposited using pulsed laser deposition (PLD) showed better coloration and bleaching cycle than those made from hotwire chemical vapor deposition (HWCVD) technique.
Author: AnnaKarin Jonsson
Publisher:
ISBN: 9789155454739
Category :
Languages : en
Pages : 59
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Author: Stefan Svensson
Publisher:
ISBN: 9789170321627
Category :
Languages : en
Pages : 100
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Author: Vo-Van Truong
Publisher: The Branch
ISBN: 9780660168593
Category : Windows
Languages : en
Pages : 133
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Book Description
Describes a project to adapt the sol-gel method for the preparation of individual thin films of solid-state ionic materials used in an electrochromic device and to fabricate and test such a device, with a view toward its application in energy-efficient windows whose optical properties can be changed by application of an electric field. After an introduction, the second and third chapters describe the sol-gel methodology and the methods used for preparation of each of the thin film layers. Results of studies of the electrical, optical, electrochemical, and electrochromic properties of each layer are enumerated and compared to those of similar films prepared by other methods. Subsequent chapters detail the preparation of indium tin oxide film used as a transparent conductor, the tungsten trioxide base layer, the vanadium pentoxide storage layer (counter electrode), and gel- and polymer-type lithium ion conductors. Chapter 7 discusses the performance of different types of electrochromic devices made from different combinations of the component layers. The conclusion summarizes the overall achievements of the project and its potential commercial applications.
Author: Koduru Hari Krishna
Publisher: LAP Lambert Academic Publishing
ISBN: 9783845474373
Category :
Languages : en
Pages : 232
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Book Description
Around the Globe, utilization of 'electrical energy' has been increasing substantially and became inevitable source to fulfil the metropolitan human life needs, ever expanding industrialization & corporate companies' requirements. In this regard, "renewable energy" researchers's community has been striving for the best alternatives to reduce the utilization of 'electrical energy' and triggered their research towards electrochromic window technology. Transition metal oxides (TMOs) have been recognized as versatile chromogenic materials in thin film configuration. It is noteworthy that, chromogenic properties of thin films significantly depend on type of deposition technique and processing parameters. In the present book, we presented the preparation of Metal Oxide thin films grown by Plasma Assisted Activated Reactive Evaporation and carried out a comparative investigation on "Microstructural and electrochromic properties of amorphous, nano-crystalline and polycrystalline thin films." In addition to present study, we extended our research to grow Nano-crystalline metal oxide thin films on ITO coated flexible substrates for cutting-edge future-based electrochromic technological needs
