Electrolytic ZrO2 Coatings: I. Electrochemical Aspects

Gal‐Or, L.; Silberman, I.; Chaim, R.

doi:10.1149/1.2085904

Cited by 165 publications

(56 citation statements)

References 4 publications

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“…[78] Electrochemical base generation by reduction of the nitrate ion is the most traditional approach: it was in fact employed long before the work by Izaki for electrodeposition of redox active Ni(OH) 2 thin films. [79] The same approach was also taken for preparation of ceramic films such as CdO, [80,81] ZrO 2 , [82] TiO 2 , [83,84] and other mixed oxides. [85,86] For these materials, however, electrically insulating metastable amorphous hydroxides are primarily obtained and are then converted to crystalline www.afm-journal.de oxides by post-annealing at high temperatures.…”

Section: Electrodeposition Of Znomentioning

confidence: 99%

Electrodeposition of Inorganic/Organic Hybrid Thin Films

Yoshida

Zhang

Komatsu

et al. 2008

Adv Funct Materials

338

344

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Electrodeposition of inorganic compound thin films in the presence of certain organic molecules results in self‐assembly of various hybrid thin films with new properties. Examples of new discoveries by the authors are reviewed, taking cathodic formation of a ZnO/dye hybrid as the leading example. Hybridization of eosinY leads to the formation of highly oriented porous crystalline ZnO as the consequence of dye loading. The hybrid formation is a highly complicated process involving complex chemistry of many molecular and ionic constituents. However, electrochemical analyses of the relevant phenomena indicate the possibility of reaching a comprehensive understanding of the mechanism, giving us the chance to further develop them into industrial technologies. The porous crystals are ideal for photoelectrodes in dye‐sensitized solar cells. As the process also permits the use of non‐heat‐resistant substrates, the technology can be applied for the development of colorful and light‐weight plastic solar cells.

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Section: Electrodeposition Of Znomentioning

confidence: 99%

Electrodeposition of Inorganic/Organic Hybrid Thin Films

Yoshida

Zhang

Komatsu

et al. 2008

Adv Funct Materials

338

344

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“…[9,13,15] However, ZnO in fact is almost the only material that results in a direct crystallization of metal oxide. In most other cases, such as TiO 2 [17] and ZrO 2 , [18] the electrodeposition yields only hydroxide films, which have to be heated for crystallization. Besides ZnO, electrodeposition of a crystalline oxide thin film of Pb II (PbO) from an aqueous solution of Pb(NO 3 ) 2 has been reported by Zhitomirsky et al [19] PbO has two crystal systems, a (tetragonal) and b (orthorhombic), both of which exhibit n-type semiconductivity, with bandgap energies of 1.9 and 2.7 eV, respectively.…”

Section: Introductionmentioning

confidence: 99%

Formation of Highly Crystallized β‐PbO Thin Films by Cathodic Electrodeposition of Pb and Its Rapid Oxidation in Air

Sawatani

Ogawa

Yoshida³

et al. 2005

Adv Funct Materials

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The process of electrodeposition of β‐PbO thin films from aqueous solutions of PbII salts has been studied in detail. Contrary to the mechanism assumed in previous studies, thin films of crystalline β‐PbO are obtained after cathodic electrolysis in aqueous solutions of various soluble salts of PbII (Pb(NO3)2, Pb(ClO4)2, and Pb(CH3COO)2), and in both the presence and the absence of O2, thus indicating no contribution of OH– generation by electroreduction of NO3– and/or O2 to the formation of β‐PbO. A gradual color change is noted: a freshly electrodeposited gray film turns yellow as it dries in air. Drying of the films under controlled atmosphere (Ar or O2), combined with scanning electron microscopy (SEM) observation and X‐ray diffraction (XRD) measurement, has revealed that freshly deposited films are of metallic Pb, which are oxidized and converted into β‐PbO. Such a reaction is operative only when a freshly electrodeposited activated wet Pb film is in contact with gaseous O2. Despite the rapid conversion of a solid material, the resultant β‐PbO thin films are highly crystallized and possess highly ordered internal nanostructure. Elongated nanoparticles (30 nm × 100 nm) are assembled in a regular alignment to compose a large platelet (greater than 10 μm in size) with single‐crystalline character, as revealed by transmission electron microscopy (TEM) observation and selected‐area electron diffraction (SAED) measurement.

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“…Tanto las suspensiones como las disoluciones de estos materiales se preparan por lo general en medio org ‡nico para no da-ar las propiedades intr'nsecas del material final. No obstante, ya fuera del campo de los supercondutores, Gal-Or y col. [70][71][72][73][74] han abierto una prometedora l'nea de investigaci-n sobre la deposici-n de Al 2 O 3 , ZrO 2 , ZrTiO 4 a partir de las disoluciones de los cationes correspondientes.…”

Section: Semiconductoresunclassified

Conformado de materiales cerámicos por electroforesis en medios acuosos

Ferrari¹,

Moreno²

1998

Bol. Soc. Esp. Ceram. Vidr.

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La deposici-n electroforŽtica es un proceso de conformado particularmente sencillo en el que, al hacer pasar una corriente a travŽs de una suspensi-n coloidal o una disoluci-n, se obtienen recubrimientos sobre materiales conductores. La mayor parte de los materiales org ‡nicos y minerales pueden ser procesados por electrodeposici-n, siendo la mayor dificultad la selecci-n del veh'culo l'quido y el ajuste de las condiciones experimentales al sistema seleccionado. En el conformado por v'a l'quida el Žxito del proceso radica en la preparaci-n de suspensiones estables de determinadas caracter'sticas elŽctricas. En este sentido el uso de veh'culos org ‡nicos presenta grandes ventajas, ya que evitan en gran medida los procesos electrol'ticos que tienen lugar en el entorno del electrodo, y que por tanto afectan a la homogeneidad y posible contaminaci-n del recubrimiento. No obstante, el uso de org ‡nicos supone el encarecimiento de un proceso que se caracteriza por sus ventajas econ-micas y ecol--gicas. Por ello, los procesos de electroforesis a partir de medios acuosos, est ‡n recibiendo una creciente atenci-n dadas las enormes posibilidades para su implantaci-n en ciclos de producci-n de una amplia gama de materiales, como de hecho ocurre en la obtenci-n de recubrimientos de arcillas y esmaltes. En este trabajo se lleva a cabo una revisi-n de la fisicoqu'mica del proceso as' como de sus posibilidades de aplicaci-n en la fabricaci-n de productos cer ‡micos y v'treos en medio acuoso. Palabras clave: Deposici-n, Electroforesis, Suspensiones, Recubrimientos. Electrophoretic forming of ceramics in aqueous mediaElectrophoretic deposition is a particularly easy forming technique in which coatings onto conducting electrodes are obtained after applying a dc electric field to a colloidal suspension or solution. Most organic materials and minerals can be deposited, being the biggest difficulty the selection of the organic vehicle and the adjustment of the experimental conditions. In wet forming processes, the success is determined by the preparation of stable suspensions with the required electrical properties. In this sense, the use of organics presents important advantages, since avoid electrolityc processes in the vicinity of electrodes, which highly affect the homogeneity and contamination of the coating. However, the use of organics increases the costs of a process characterized for its economical and environmental advantages. This is the reason why aqueous electrophoresis is receiving an increasing attention due to the great possibilities to be considered for production cycles for a broad variety of materials, as already occurs in the case of clays and enamels. In this work, a review of the physical chemistry of the process is made, and possible applications in ceramics and glasses manufacturing are evaluated. Key words: Deposition, Electrophoresis, Suspensions, Coatings INTRODUCCIîNEl conformado por deposici-n electroforŽtica, o electrodeposici-n (EPD), se enmarca dentro de los mŽtodos de conformado por v'a hoemeda, en l...

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Electrolytic ZrO2 Coatings: I. Electrochemical Aspects

Cited by 165 publications

References 4 publications

Electrodeposition of Inorganic/Organic Hybrid Thin Films

Electrodeposition of Inorganic/Organic Hybrid Thin Films

Formation of Highly Crystallized β‐PbO Thin Films by Cathodic Electrodeposition of Pb and Its Rapid Oxidation in Air

Conformado de materiales cerámicos por electroforesis en medios acuosos

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