polymer transition metal oxide nanohybrids

... thesis work, transition- metal- oxide- based nanostructures, manganese dioxide nanostructures, ruthenium oxide nanotubes, as well as composite materials consisting of transition metal oxide and reduced ... the potential application as a supercapacitor electrode 2.2.3 Transition- metal- oxide- based materials A number of transition metal oxides with various oxidation states represent a type of attractive ... process Ruthenium oxides, manganese oxides, vanadium pentoxide, nickel oxides, cobalt oxides et al have been investigated as electrode materials for supercapacitor applications Ruthenium -oxide- based...

Ngày tải lên: 09/09/2015, 18:57

... properties of various metal oxide nanostructure arrays Nanostructures of zinc oxides, 29 Chapter Introduction to Metal Oxide Nanostructures molybdenum oxides, tungsten oxides and niobium oxides are found ... the metal oxides, including SnO2, In2O3, and ZnO Deviations in the properties of metal oxides due to the adsorption of specific gases render them as potential gas sensors Transition metal oxides, ... structure) provide the metal oxides with different electrical behavior Studies suggested that for most of the 16 Chapter Introduction to Metal Oxide Nanostructures nanostructured metal oxides investigated,...

Ngày tải lên: 14/09/2015, 14:11

... Overview of transition metal (W, Mo) oxides and their electrochromic properties 1.1 Introduction of transition metal In chemistry, the term transition metal (sometimes also called a transition ... tungsten oxide and molybdenum oxide [4] 1.2.1 Crystal structures of tungsten oxide and molybdenum oxide For Mo oxide, just as for W oxide, the basic structural element is an octahedron with a metal ... Overview of transition metal (W, Mo) oxides and their electrochromic properties 1.1 Introduction of transition metal 1.2 Bulk crystalline structures of tungsten oxide and...

Ngày tải lên: 25/03/2015, 11:58

... BINARY METAL OXIDE AND POLYMER BASED LIQUID REPELLENT SELF-CLEANING SURFACES ANAND GANESH VENKATESAN (B Eng.) Anna ... mechanism Both hydrophilic and hydrophobic surfaces involve the application of nanostructures (metal oxide /polymer) to achieve the self-cleaning phenomenon Recent reports state that by applying new-age ... Amphiphobic/Superamphiphobic coatings) self-cleaning coatings To achieve this objective, suitable metal oxide and polymer based electrospun/electrosprayed surfaces have been developed and the self-cleaning...

Ngày tải lên: 09/09/2015, 11:14

... pyroelectric, and luminescence properties of metal oxides (4, 12–14) Chemical and biological sensors having nanostructured metal oxides and especially metal- oxide nanowires benefit from the comprehensive ... quasi-one-dimensional metaloxide nanostructures already reported (see reviews 16, 17) (A) nanowires and nanorods; (B) core-shell structures with metallic inner core, semiconductor, or metal- oxide; (C) nanotubules/nanopipes ... sensitivity (reactivity) PHOTOCHEMICAL PROPERTIES OF INDIVIDUAL METAL- OXIDE NANOWIRES The photochemical and photophysical properties of metal- oxide nanoparticles and materials fabricated from them have...

Ngày tải lên: 19/03/2014, 16:47

... r r r Fig Schematic layout of a typical resistive gas sensor The sensitive metal oxide layer is deposited over the metal electrodes onto the substrate In the case of compact layers, the gas cannot ... reaction where kreac is the reaction constant for carbon dioxide production One also considers that the concentration Conduction Model of Metal Oxide Gas Sensors 153 Fig 10 Literature survey of species ... overall sensor resistance Conduction Model of Metal Oxide Gas Sensors 163 Fig 14 Situation before (left) and after contact (right) between the metal electrode and the semiconductor in Case (for...

Ngày tải lên: 19/03/2014, 16:47

... of nanostructured metal oxides for gas sensing applications Please cite this article in press as: M.C Carotta, et al., Ethanol interference in light alkane sensing by metal- oxide solid solutions, ... modulation in iron doped tin oxide sensors, Sens Actuators B: Chem 115 (2006) 610–615 [5] M.C Carotta, A Cervi, A Giberti, V Guidi, C Malagù, G Martinelli, D Puzzovio, Metal- oxide solid solutions for ... of propane sensing with tin dioxide based sensors, Sens Actuators B: Chem 108 (2005) 75–83 [3] D.P Mann, T Paraskeva, K.F.E Pratt, I.P Parkin, D.E Williams, Metal oxide semiconductor gas sensors...

Ngày tải lên: 19/03/2014, 16:48

... the matrix of metal oxide Based on these results, the modulation of the width of two depletion layers existing at the surface of metal oxide grains and at the interface of metal oxide grains and ... depletion layers is located at the surface of the grains of the metal oxide film and the second type at the interface between MWCNTs and metal oxide films Considering the sensitivity of hybrid films (see ... can be derived that the adsorption of NO2 at the metal oxide modifies the depletion layer at the surface of its grains and also at the n -metal oxide/ p-MWCNTs heterostructures This combined effect...

Ngày tải lên: 19/03/2014, 16:48

... ion-beam or rf sputtering from metallic or metal oxide targets Two different special regimes can be used In the first one the formation of “extra” interfaces in the body of the metal film occurs as a result ... well [26] Among metal oxide semiconductors, tungsten oxide is a promising material for gas sensing Several studies have shown that it can be used for the detection of nitrogen oxide (NO and NO2 ... trimmer for metal oxide gas sensors, Sens Actuators, B Chem 65 (2000) 258–262 M Fleischer, S Kornely, T Weh, H Meixner, Selective gas detection with high-temperature operated metal oxides using...

Ngày tải lên: 20/03/2014, 13:05

... value can be anticipated [6,9] Further, the polymer PVA helps this activity in two ways: firstly, it works as a weak sensor and secondly, it is a hydrophilic polymer, which hold the adsorbed water ... with relative humidity change from 0–86% The humidity sensing was based on hydrophilic polymers doped with metal salts, which increase the sensor sensitivity due to the appearance of ionic conductivity ... procedure that was being used and using the well-established fact that SnO2 is a highly stable oxide, the spectrum was well anticipated Thus we can conclude here that the film formed was merely...

Ngày tải lên: 20/03/2014, 13:06

... nano-optoelectronic devices Applications of metal oxide nanostructures 6.1 Metal oxide gas sensors Metal oxides semiconductors are normally high gap metal oxides in which the semiconducting behavior ... a single material is the sequential oxidation of metal nanowires Arrays of metal metal oxide core–shell nanowires and single-crystalline metal oxide nanotubes have been obtained [155] The process ... 1D metal oxide nanostructures 22 Preparation of quasi 1D metal oxide heterostructures 24 Applications of metal...

Ngày tải lên: 20/03/2014, 13:06

... sensing based on metal oxide nanowires, such as zinc oxide (ZnO), tin oxide (SnO2), indium oxide (In2O3) aluminum oxide (Al2O3), gallium oxide (Ga2O3), tungsten oxide (WO3), and vanadium oxide (V2O5) ... heterostructured metal oxide nanowires start to attract much attention Several types of core/shell structure have been synthesized, such as semiconductor /oxide [119], metal/ oxide [120], oxide/ oxide [114,121,122], ... nanorod/CdS nanoparticle (core/shell) composites [56] Q1D rare earth metal oxides, such as europium oxide (Eu2O3) nanorods [57] and cerium oxide (CeO2) nanotubes [58], have also been obtained via this...

Ngày tải lên: 20/03/2014, 13:06

... selected metal oxide sensors to identify the gases under tests by means of pattern recognition and classification techniques Experimental 2.1 Fabrication of thick-film sensor arrays Porous metal oxide ... electrodes to the sensitive film To form the film, a drop of metal oxide paste was applied onto the electrodes Pastes were prepared by mixing oxide powders with a glass frit and an organic binder Nanosized ... insight to the feasibility of this sensor design modification, a large variety of semiconductor metal oxides traditionally employed in gas-sensors have been tested at different operating temperatures...

Ngày tải lên: 20/03/2014, 13:07

... Properties of Transition- Metal Compounds Finally, we summarize some of the properties of transition- metal compounds and attempt to distinguish those which are characteristic of a transition- metal complex ... group and transition- metal ions Transition- metal complexes may gain or lose ligands to change geometry and so main group complexes The existence of coordination chemistry in the transition- metal ... 18 Nevertheless, the transition elements are also, and interchangeably, known as the transition metals in view of their typical metallic properties The chemistry of the transition elements has...

Ngày tải lên: 04/06/2014, 16:04

... photocatalysis system, transition- metal sulfides (MS = Ag2S, SnS, and CuS) combined with noble -metal Pt acted as dual co-catalysts for photocatalytic hydrogen evolution However, when transition- metal sulfides ... nm) can be assigned to the absorption of transition- metal sulfides We investigated the photocatalytic activity for hydrogen evolution over MS/ZnIn S (MS = metal sulfide: Ag S, SnS, CoS, CuS, NiS, ... with noble metals as reduction catalysts and noble -metal sulfides as oxidation catalysts [29,30] It is noteworthy that replacing Figure TEM images (A) ZnIn2S4 and (B) CuS/ZnIn2S4 noble -metal sulfides...

Ngày tải lên: 21/06/2014, 04:20

... connecting metal ions and CNMs Our methods can be applicable for a large variety of metal ions By adopting bi -metal or even tri -metal precursors in a certain mole ratio, composite oxide nanocrystals ... http://www.nanoscalereslett.com/content/6/1/71 Page of Figure TEM images of various metal oxide NPs of Fe2O3, SnO2, CeO2, and TiO2 on a few-layer graphene earth metal oxides on MWNTs See Additional file (SI 5) for more details ... Nanocomposites of Metals, Metal Oxides, and Carbon Nanotubes via Self-Assembly J Am Chem Soc 2007, 129:9401 14 Wang D, Li ZC, Chen LW: Templated Synthesis of Single-Walled Carbon Nanotube and Metal Nanoparticle...

Ngày tải lên: 21/06/2014, 06:20

... variety of metal oxide gels were synthesized and reported, including silica, alumina, titania, mixed Al/Si and transition metal oxides from the corresponding metal chlorides and metal alkoxides or ... silicates from silicon alkoxides, sol-gel processing of transition metal oxides has much less been studied, mainly due to the high reactivity of transition metal alkoxides In general, the sol-gel ... precursors is longer and includes, in addition to inorganic metal salts and metal alkoxides, also metal acetates and metal acetylacetonates Organometallic compounds are also frequently used, but then...

Ngày tải lên: 02/07/2014, 11:36

... of metal or metalloid elements surrounded by various types of ligands Metal alkoxides belong to a family of organometallic compounds which contain an organic ligand attached to the metal or metalloid ... opening polymerization of ethylene oxide 34 Figure 2.18 Ring opening polymerization and side reactions for propylene oxide 35 Figure 2.19 Insertion coordination polymerization of ethylene oxide ... Functional Poly(ethylene oxide) …………… 39 2.5.3 Functional Poly(ethylene oxide) and Routes to Metal/ Metal Oxide Stablilization……………………………………………………………….39 2.5.3.1 Diblock Copolymers as Chelating Agents……………………….39...

Ngày tải lên: 13/11/2014, 16:16

Ngày tải lên: 08/09/2015, 19:36

... DESIGN AND APPLICATIONS OF PHOSPHINE LIGANDS TO TRANSITION METAL- CATALYZED REACTIONS JIANG CHUNHUI (M.Sc., Nanjing Univ.) A THESIS SUBMITTED FOR THE ... Chapter Development of New Phosphine Ligands Derived from Amino Acids and Their Applications in Transition- Metal- Catalyzed Asymmetric Reactions 4.1 Introduction 139 4.2 Results and discussions 145 ... Phosphine-olefin ligands 167 4.4.2.6 Phosphine-imine ligands 168 4.4.3 General procedure for transition- metal- catalyzed reactions 169 4.4.3.1 Pd-catalyzed AAA reaction 169 4.4.3.1 Ag-catalyzed Mannich...

Ngày tải lên: 09/09/2015, 09:59