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RISS 인기검색어
- 검색키워드
- 저자 : MARC WILLINGER (검색결과 17 건)
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A general soft-chemistry route to metal phosphate nanocrystals
Marc-Georg Willinger,Guylhaine Clavel,Weihua Di,니콜라피나 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.6
The ‘‘benzyl alcohol route’’ was extended for the synthesis of various metal phosphate nanocrystals. The proposed one pot reaction leads to nanocrystalline titanium, zirconium, vanadium, yttrium and lanthanide phosphates at a yield above 90%. The synthesized particles are characterized by a high crystallinity and a small size distribution.
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Willinger, Marc-Georg,Neri, Giovanni,Bonavita, Anna,Micali, Giuseppe,Rauwel, Erwan,Herntrich, Tobias,Pinna, Nicola Royal Society of Chemistry 2009 Physical chemistry chemical physics Vol.11 No.19
<P>A new atomic layer deposition (ALD) process was applied for the uniform coating of carbon nanotubes with a number of transition-metal oxide thin films (vanadium, titanium, and hafnium oxide). The presented approach is adapted from non-aqueous sol–gel chemistry and utilizes metal alkoxides and carboxylic acids as precursors. It allows the coating of the inner and outer surface of the tubes with a highly conformal film of controllable thickness and hence, the production of high surface area hybrid materials. The morphology and the chemical composition as well as the high purity of the films are evidenced through a combination of electron microscopic and electron-energy-loss spectrometric techniques. Furthermore, in order to highlight a possible application of the obtained hybrids, the electrical and sensing properties of resistive gas sensors based on hybrid vanadium oxide-coated carbon nanotubes (V<SUB>2</SUB>O<SUB>4</SUB>–CNTs) are reported and the effect of thermal treatment on the gas sensing properties is studied.</P> <P>Graphic Abstract</P><P>The controlled deposition of high quality thin metal oxide films onto the surface of CNTs is achieved through a new approach to ALD. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b821555c'> </P>
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One-Step Synthesis and Self-Assembly of Metal Oxide Nanoparticles into 3D Superlattices
Pucci, Andrea,Willinger, Marc-Georg,Liu, Feng,Zeng, Xiangbing,Rebuttini, Valentina,Clavel, Guylhaine,Bai, Xue,Ungar, Goran,Pinna, Nicola American Chemical Society 2012 ACS NANO Vol.6 No.5
<P>A simple one-pot approach based on the “benzyl alcohol route” is introduced for the fabrication of highly ordered supercrystals composed of highly uniform 3–4 nm zirconia and rare-earth stabilized zirconia nanoparticles. The as-fabricated supercrystals reach sizes larger than 10 μm and present well-defined 3D morphologies such as flower-like, rhombic dodecahedron, and bipyramids. This system is unique in that the supercrystals are formed in one-step directly in the reaction medium where the nanoparticles are synthesized. The uniformity in nanocrystal shape and size is attributed to the <I>in situ</I> formation of benzoate species that directs the nanoparticle growth and assembly. The low colloidal stabilization of the benzoate-capped nanoparticles in benzyl alcohol promotes the formation of supercrystals in solution by π–π interaction between the <I>in situ</I> formed benzoate ligands attached to neighboring particles. By varying the reaction temperature and the nature of the doping the way the nanobulding blocks assemble in the supercrystals could be controlled. Standard FCC superlattice packings were found together with more unusual ones with <I>P</I>6<I>/mmm</I> and <I>R</I>3̅<I>m</I> symmetries.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-5/nn3010735/production/images/medium/nn-2012-010735_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn3010735'>ACS Electronic Supporting Info</A></P>
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Marichy, Catherine,Donato, Nicola,Willinger, Marc‐,Georg,Latino, Mariangela,Karpinsky, Dmitry,Yu, Seung‐,Ho,Neri, Giovanni,Pinna, Nicola WILEY‐VCH Verlag 2011 Advanced functional materials Vol.21 No.4
<P><B>Abstract</B></P><P>A new atomic layer deposition (ALD) process for nanocrystalline tin dioxide films is developed and applied for the coating of nanostructured materials. This approach, which is adapted from non‐hydrolytic sol‐gel chemistry, permits the deposition of SnO<SUB>2</SUB> at temperatures as low as 75 °C. It allows the coating of the inner and outer surface of multiwalled carbon nanotubes with a highly conformal film of controllable thickness. The ALD‐coated tubes are investigated as active components in gas‐sensor devices. Due to the formation of a p‐n heterojunction between the highly conductive support and the SnO<SUB>2</SUB> thin film an enhancement of the gas sensing response is observed.</P>
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Marichy, Catherine,Deché,zelles, Jean-Francois,Willinger, Marc-Georg,Pinna, Nicola,Ravaine, Serge,Vallé,e, Renaud Royal Society of Chemistry 2010 Nanoscale Vol.2 No.5
<P>Combining both electromagnetic simulations and experiments, it is shown that the photonic pseudo band gap (PPBG) exhibited by a silica opal can be fully controlled by Atomic Layer Deposition (ALD) of titania into the pores of the silica spheres constituting the opal. Different types of opals were assembled by the Langmuir–Blodgett technique: homogeneous closed packed structures set up of, respectively, 260 and 285 nm silica spheres, as well as opal heterostructures consisting of a monolayer of 430 nm silica spheres embedded within 10 layers of 280 nm silica spheres. For the stepwise infiltration of the opals with titania, titanium isopropoxide and acetic acid were used as metal and oxygen sources, in accordance with a recently published non-aqueous approach to ALD. A shift of the direct PPBG, its disappearance, and the subsequent appearance and shifting of the inverse PPBG are observed as the opal is progressively filled. The close agreement between simulated and experimental results is striking, and promising in terms of predicting the properties of advanced photonic materials. Moreover, this work demonstrates that the ALD process is rather robust and can be applied to the coating of complex nanostructures.</P> <P>Graphic Abstract</P><P>Non-aqueous sol–gel chemistry applied to atomic layer deposition was used to impregnate silica opals, fabricated by the Langmuir–Blodgett technique, in order to tune their photonic band gap properties. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b9nr00220k'> </P>
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Yu, Seung-Ho,Pucci, Andrea,Herntrich, Tobias,Willinger, Marc-Georg,Baek, Seung-Hwan,Sung, Yung-Eun,Pinna, Nicola Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.3
<P>A one-pot template-free solvothermal synthesis of crystalline Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> nanostructures based on the “benzyl alcohol route” is introduced. The 1–2 µm sized nanostructured spherical particles are constituted of nanocrystallites in the size range of a few nm. This is the first report showing that crystalline Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> can be directly obtained by soft chemistry solution routes. The as-synthesized crystalline nanostructures show good lithium intercalation/deintercalation performances at high rates (up to 30 C) and good cycling stabilities. Annealing the nanostructures at 750 °C improves the performance, which approaches the theoretical capacity of Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> with no noticeable (less than 5%) capacity loss after 200 cycles.</P> <P>Graphic Abstract</P><P>A one-pot template-free solvothermal synthesis of crystalline Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> nanostructures showing high lithium intercalation/deintercalation performances is introduced. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm03064c'> </P>
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The Determinants of Trusting and Reciprocal Behaviour - Evidence from an Intercultural Experiment
CSONGOR CSUKAS;PAULO FRACALANZA;TAMAS KOVACS;MARC WILLINGER 경제연구소 2008 Journal of Economic Development Vol.33 No.1
In this paper we provide evidence that trust and reciprocity, the two key elements of social capital, are affected by country differences. Based on the amounts sent and returned in the investment game by student subjects we find evidence on trusting and reciprocal behaviour and we show significant cross-country differences between the levels of trust and reciprocity. We also show that the answers for ‘trust in strangers’ type attitudinal questions have a significant effect either on trusting or reciprocal behaviour, while gender does not affect any of them. We report that reciprocity is affected by the same variables as trust: in particular stated trust has a significant influence on reciprocal behaviour, which can be explained by attitudes such as projective reasoning. Furthermore, we find that questionnaire based rankings of countries are poor predictors of trusting behaviour rankings, which is mainly due to the differences in strength of correlation between stated trust and trusting behaviour country-by-country.
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