Imperial College London
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ProfessorRogerWhatmore

Faculty of Engineering, Department of Materials

Visiting Professor
 
 
 
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Contact

 

r.whatmore

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

343 results found

Mortara L, Navarro A, Whatmore RW, Alcock JRet al., 2004, Correlation of sintered microstructure with green density in thick-film PZT, 8th Conference of the European-Ceramic-Society, Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 309-312, ISSN: 1013-9826

Conference paper

Dorey RA, Whatmore RW, Beeby SP, Torah RN, White NMet al., 2004, Screen printed PZT composite thick films, 10th European Meeting on Ferroelectricity, Publisher: TAYLOR & FRANCIS LTD, Pages: 89-92, ISSN: 1058-4587

Conference paper

Shaw C, Landi S, Whatmore R, Kirby Pet al., 2004, Development aspects of an integrated pyroelectric array incorporating a thin PZT film and radiation collectors, 10th European Meeting on Ferroelectricity, Publisher: TAYLOR & FRANCIS LTD, Pages: 93-97, ISSN: 1058-4587

Conference paper

Zhang Q, Shaw CP, Huang Z, Whatmore RWet al., 2004, Sol-gel derived lead zirconate titanate thick films and their improved pyroelectric properties, 16th International Symposium on Integrated Ferroelectrics/5th Korean Workshop on High Dielectric Devices and Materials, Publisher: TAYLOR & FRANCIS LTD, Pages: 207-216, ISSN: 1058-4587

Conference paper

Navarro A, Alcock JR, Whatmore RW, 2004, Aqueous colloidal processing and green sheet properties of lead zirconate titanate (PZT) ceramics made by tape casting, 8th International Conference on Electronic Ceramics and Their Applications (ELECTROCERAMICS VIII), Publisher: ELSEVIER SCI LTD, Pages: 1073-1076, ISSN: 0955-2219

Conference paper

Huang Z, Battat J, Donohue PP, Todd MA, Whatmore RWet al., 2003, On the phase transformation kinetics in lead scandium tantalate thin films, JOURNAL OF PHYSICS D-APPLIED PHYSICS, Vol: 36, Pages: 3039-3046, ISSN: 0022-3727

Journal article

Duval FFC, Dorey RA, Haigh RH, Whatmore RWet al., 2003, Stable TiO<sub>2</sub>/Pt electrode structure for lead containing ferroelectric thick films on silicon MEMS structures, THIN SOLID FILMS, Vol: 444, Pages: 235-240, ISSN: 0040-6090

Journal article

Zhang Q, Whatmore RW, 2003, Improved ferroelectric and pyroelectric properties in Mn-doped lead zirconate titanate thin films, JOURNAL OF APPLIED PHYSICS, Vol: 94, Pages: 5228-5233, ISSN: 0021-8979

Journal article

Duval FFC, Dorey RA, Zhang Q, Whatmore RWet al., 2003, Lead germanium oxide sinter-assisted PZT composite thick films, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 23, Pages: 1935-1941, ISSN: 0955-2219

Journal article

Dowling A, Clift R, Grobert N, Hutton D, Oliver R, O'Neill O, Pethica J, Pidgeon N, Porritt J, Ryan J, Seaton A, Tendler S, Welland M, Whatmore Ret al., 2003, Nanotechnology under the microscope, NANOTECHNOLOGY, Vol: 14, ISSN: 0957-4484

Journal article

Whatmore RW, Molter O, Shaw CP, 2003, Electrical properties of Sb and Cr-doped PbZrO<sub>3</sub>-PbTiO<sub>3</sub>-PbMg<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub> ceramics, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 23, Pages: 721-728, ISSN: 0955-2219

Journal article

Huang Z, Donohue PP, Zhang Q, Williams DJ, Anthony CJ, Whatmore RW, Todd MAet al., 2003, Comparative microstructure and electrical property studies of lead scandium tantalate thin films as prepared by LDCVD, sol-gel and sputtering techniques, JOURNAL OF PHYSICS D-APPLIED PHYSICS, Vol: 36, Pages: 270-279, ISSN: 0022-3727

Journal article

Munasinghe C, Heikenfeld J, Dorey R, Whatmore R, Bender J, Wager J, Steckl AJet al., 2003, Improved luminance and efficiency of ZnS:Mn and GaN:Eu TDEL devices using PZT thick dielectric films, Pages: 75-76

Electroluminescent (EL) devices have traditionally utilized thin film dielectrics to provide the electrical isolation and high electric field across the phosphor layer. However, these so-called thin film electroluminescent (TFEL) devices require very stringent fabrication conditions and processes due to premature device breakdown caused by high field points in the thin insulating layers. The development of EL devices with thick dielectric layers (TDEL) has overcome this problem. However, initially the emission performance of TDEL devices was below that of TFEL devices. Recently, successful efforts have been made in the optimization of TDEL enhancing both luminance and power efficiency1. In this paper we report on the optimization of TDEL devices in both the phosphor material and the device structure. The TDEL device consists of a metal-insulator-semiconductor-insulator-metal (MISIM) stacked film structure built upon a transparent glass substrate (Fig. 1). The main phosphor materials used were ZnS:Mn and rare earth doped GaN. The ZnS:Mn, with a Mn concentration of 0.6 at.%, is deposited using magnetron sputtering whereas the GaN was grown in a solid source MBE system. Thin (100nm) strontium titanate (STO) films have been placed encapsulating the phosphor material. The STO films with high dielectric constant (εr-140) function as charge trapping dielectric layers in the TDEL device.

Conference paper

Battat J, Huang Z, Donohue PP, Whatmore RWet al., 2003, A model of phase transition kinetics in lead scandium tantalate thin films, 15th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 1347-1357, ISSN: 1058-4587

Conference paper

Dorey RA, Whatmore RW, Beeby SP, Torah RN, White NMet al., 2003, Screen printed PZT thick films using composite film technology, 15th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 651-658, ISSN: 1058-4587

Conference paper

Zhang Q, Whatmore RW, 2003, Improved ferroelectric properties in Mn-doped PZT thin films, 15th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 73-84, ISSN: 1058-4587

Conference paper

Abad E, Whatmore RW, Zhang Q, Huang ZRet al., 2003, Soft lithographic patterning of oxide thin films, Conference on Smart Sensors, Actuators, and MEMS, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, Pages: 176-184, ISSN: 0277-786X

Conference paper

Marson S, Dorey RA, Zhang Q, Whatmore RWet al., 2003, Thick PZT micro-features obtained by direct patterning of photosensitive precursor solution, 15th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 585-593, ISSN: 1058-4587

Conference paper

Shaw CP, Gupta S, Stringfellow SB, Navarro A, Alcock JR, Whatmore RWet al., 2002, Pyroelectric properties of Mn-doped lead zirconate-lead titanate-lead magnesium niobate ceramics, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 22, Pages: 2123-2132, ISSN: 0955-2219

Journal article

Dorey RA, Stringfellow SB, Whatmore RW, 2002, Effect of sintering aid and repeated sot infiltrations on the dielectric and piezoelectric properties of a PZT composite thick film, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 22, Pages: 2921-2926, ISSN: 0955-2219

Journal article

Sanson A, Whatmore RW, 2002, Properties of Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub>-(Na<sub>1/2</sub>Bi<sub>1/2</sub>)TiO<sub>3</sub> piezoelectric ceramics, International Joint Conference on the Applications of Ferroelectrics, Publisher: INST PURE APPLIED PHYSICS, Pages: 7127-7130, ISSN: 0021-4922

Conference paper

Dorey RA, Haigh RD, Stringfellow SB, Whatmore RWet al., 2002, Effect of sol infiltrations on electrical properties of PZT, Ferroelectrics UK 2001 Meeting, Publisher: MANEY PUBLISHING, Pages: 146-148, ISSN: 0967-9782

Conference paper

Dunn S, Shaw CP, Huang Z, Whatmore RWet al., 2002, Ultrahigh resolution of lead zirconate titanate 30/70 domains as imaged by piezoforce microscopy, NANOTECHNOLOGY, Vol: 13, Pages: 456-459, ISSN: 0957-4484

Journal article

Dunn S, Whatmore RW, 2002, Substrate effects on domain structures of PZT 30/70 sol-gel films via PiezoAFM, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 22, Pages: 825-833, ISSN: 0955-2219

Journal article

Huang Z, Zhang Q, Whatmore RW, 2002, Studies of lead zirconate titanate sol aging - Part II: Particle growth mechanisms and kinetics, JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, Vol: 24, Pages: 49-55, ISSN: 0928-0707

Journal article

Whatmore RW, Zhang Q, Huang Z, Dorey RAet al., 2002, Ferroelectric thin and thick films for microsystems, Symposium on Advanced Materials for Microelectronics held at the Spring Meeting of the E-MRS, Publisher: ELSEVIER SCI LTD, Pages: 65-76, ISSN: 1369-8001

Conference paper

Stringfellow SB, Gupta S, Shaw C, Alcock JR, Whatmore RWet al., 2002, Electrical conductivity control in uranium-doped PbZrO<sub>3</sub>-PbTiO<sub>3</sub>-Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub> pyroelectric ceramics, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 22, Pages: 573-578, ISSN: 0955-2219

Journal article

Corker DL, Zhang Q, Whatmore RW, Perrin Cet al., 2002, PZT 'composite' ferroelectric thick films, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 22, Pages: 383-390, ISSN: 0955-2219

Journal article

Zhang Q, Huang Z, Whatmore RW, 2002, Studies of lead zirconate titanate sol ageing - Part I: Factors affecting particle growth, JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, Vol: 23, Pages: 135-144, ISSN: 0928-0707

Journal article

Duval F, Dorey R, Stringfellow S, Zhang Q, Whatmore Ret al., 2002, Comparison of piezoelectric properties of a MOD and a sol-gel doped PZT thin film, Ferroelectrics UK 2001 Meeting, Publisher: MANEY PUBLISHING, Pages: 37-44

Conference paper

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