Search results for: Yves J. Chabal

Items from 1 to 20 out of 53 results

article

Oxide-related defects in quantum dot containing Si-rich silicon nitride films

Lee A. Walsh, Shakil Mohammed, Siddharth C. Sampat, Yves J. Chabal, more

Thin Solid Films > 2017 > 636 > C > 267-272

Silicon-rich silicon nitride thin films were deposited by co-sputtering silicon and silicon nitride and annealed at high temperatures to form precipitates of silicon nanocrystals within the nitride matrix. This process was chosen to replicate the typical fabrication used for silicon nitride based quantum dots. Photoluminescence (PL) spectra were observed from the silicon nitride samples after a high...

article

Oxidative Dehydrogenation of Cyclohexane and Cyclohexene over Y-doped CeO₂ Nanorods

Zijie Wang, Yuzhi Gao, Yves J. Chabal, Kenneth J. Balkus

Catalysis Letters > 2017 > 147 > 3 > 738-744

The Y-doped and pure CeO₂ nanorods were tested as dehydrogenation catalysts in the oxidative dehydrogenation of cyclohexene and cyclohexane. The dehydrogenation process involves a redox process and the increased amount of oxygen vacancies improved the catalytic activity. At a temperature as low as 150 °C, compared to the temperature of ~600 °C required for vanadium catalysts, the Y-doped CeO₂ nanorods...

article

Rational design of common transition metal-nitrogen-carbon catalysts for oxygen reduction reaction in fuel cells

Yongping Zheng, Dae-Soo Yang, Joshua M. Kweun, Chenzhe Li, more

Nano Energy > 2016 > 30 > C > 443-449

Bio-inspired non-precious-metal catalysts based on iron and cobalt porphyrins are promising alternatives to replace costly platinum-based catalysts for oxygen reduction reaction (ORR) in fuel cells. However, the exact nature of the active sites is still not clearly understood, and further optimization design is needed for practical applications. Here, we report a rational catalyst design process by...

article

Aqueous process to limit hydration of thin-film inorganic oxides

Cory K. Perkins, Ryan H. Mansergh, Deok-Hie Park, Charith E. Nanayakkara, more

Solid State Sciences > 2016 > 61 > C > 106-110

Aqueous-processed aluminum oxide phosphate (AlPO) dielectric films were studied to determine how water desorbs and absorbs on heating and cooling, respectively. In-situ Fourier transform infrared spectroscopy showed a distinct, reversible mono- to bidentate phosphate structural change associated with water loss and uptake. Temperature programmed desorption measurements on a 1-μm thick AlPO film revealed...

chapter

Mechanistic Studies of Dielectric Growth on Silicon

Martin M. Frank, Yves J. Chabal

Materials Fundamentals of Gate Dielectrics > 367-401

article

Ammonia modification of oxide-free Si(111) surfaces

Tatiana Peixoto Chopra, Roberto C. Longo, Kyeongjae Cho, Yves J. Chabal

Surface Science > 2016 > 650 > C > 285-294

Amination of surfaces is useful in a variety of fields, ranging from device manufacturing to biological applications. Previous studies of ammonia reaction on silicon surfaces have concentrated on vapor phase rather than wet chemical processes, and mostly on clean Si surfaces. In this work, the interaction of liquid and vapor-phase ammonia is examined on three types of oxide-free surfaces – passivated...

article

Surface and Structural Investigation of a MnO_x Birnessite‐Type Water Oxidation Catalyst Formed under Photocatalytic Conditions

Benjamin J. Deibert, Jingming Zhang, Paul F. Smith, Karena W. Chapman, more

Chemistry – A European Journal > 21 > 40 > 14218 - 14228

Catalytically active MnO_x species have been reported to form in situ from various Mn‐complexes during electrocatalytic and solution‐based water oxidation when employing cerium(IV) ammonium ammonium nitrate (CAN) oxidant as a sacrificial reagent. The full structural characterization of these oxides may be complicated by the presence of support material and lack of a pure bulk phase. For the first time,...

article

Spectroscopic evaluation of out-of-plane surface vibration bands from surface functionalization of graphite oxide by fluorination

Muge Acik, Sriram Yagneswaran, Weina Peng, Geunsik Lee, more

Carbon > 2014 > 77 > C > 577-591

The fluorination of graphite/graphite oxide (GO) and their derivatives has been widely investigated for how fluorine interacts with sp²/sp³ carbon; however, the mechanism of this interaction has not yet been elucidated. Fluorination of GO (FGO) at either 10 or 15psi for 24h, produced two new absorption bands at ∼743cm⁻¹ and 482cm⁻¹, and are attributed to the presence of out-of-plane surface fluorine...

article

Efficient Directed Energy Transfer through Size‐Gradient Nanocrystal Layers into Silicon Substrates

William J. I. De Benedetti, Michael T. Nimmo, Sara M. Rupich, Louis M. Caillard, more

Advanced Functional Materials > 24 > 31 > 5002 - 5010

Spectroscopic evidence of directed excitonic energy transfer (ET) is presented through size‐gradient CdSe/ZnS nanocrystal quantum dot (NQD) layers into an underlying Si substrate. NQD monolayers are chemically grafted on hydrogen‐terminated Si surfaces via a self‐assembled monolayer of amine modified carboxy‐alkyl chains. Subsequent NQD monolayers are linked with short alkyldiamines. The linking approach...

article

Precursor design and reaction mechanisms for the atomic layer deposition of metal films

Karla Bernal Ramos, Mark J. Saly, Yves J. Chabal

Coordination Chemistry Reviews > 2013 > 257 > 23-24 > 3271-3281

Deposition of thin films with desired compositions, conformality and bonding to substrates is a key component in nanotechnology research. The growth of metal films by atomic layer deposition (ALD) has become an important field of study due to its wide range of applications. However, metal deposition by ALD has not been a straightforward process for most metals. Precursor design and their reactivity...

article

Manganese oxide nanorod–graphene/vanadium oxide nanowire–graphene binder-free paper electrodes for metal oxide hybrid supercapacitors

Sanjaya D. Perera, Mark Rudolph, Ruperto G. Mariano, Nour Nijem, more

Nano Energy > 2013 > 2 > 5 > 966-975

In this study MnO ₂ nanorodes (MNR) were fabricated on reduced graphene oxide (rGO) sheets using a facile hydrothermal synthesis route. As prepared binder free MNR-rGO electrodes exhibited promising electrochemical performance. A similar approach was employed to prepare V ₂ O ₅ nanowire (VNW) on rGO electrodes as anodes for supercapacitor applications. The VNW-rGO anode and...

article

Monolayer Doping via Phosphonic Acid Grafting on Silicon: Microscopic Insight from Infrared Spectroscopy and Density Functional Theory Calculations

Roberto C. Longo, Kyeongjae Cho, Wolf Gero Schmidt, Yves J. Chabal, more

Advanced Functional Materials > 23 > 27 > 3471 - 3477

Monolayer doping (MLD) is a promising technique for creating ultra shallow junctions (USJs). Here, a novel self assembled monolayer (SAM) grafting technique is proposed through a single oxygen atom capable of MLD. Consequently, this approach can use simple forms of alkylphosphonic acids and avoid carbon contamination altogether during the doping process. In this paper, density functional theory (DFT)...

article

Selective detection of olefins using a luminescent silver-functionalized metal organic framework, RPM3

Anne M. Marti, Nour Nijem, Yves J. Chabal, Kenneth J. Balkus

Microporous and Mesoporous Materials > 2013 > 174 > Complete > 100-107

A highly flexible, luminescent, three-dimensional metal organic framework (MOF), [Zn ₂ (bpdc) ₂ (bpee)]·2DMF (bpdc=4,4′-biphenyldicarboxylate; bpee=1,2-bipyridylethylene) also known as RPM3 was post functionalized with AgNO ₃ forming a π complex with the MOF’s conjugated linkers. The Ag ⁺ functionalized MOF in its activated form exhibits structural rearrangements from...

article

Vanadium oxide nanowire – Graphene binder free nanocomposite paper electrodes for supercapacitors: A facile green approach

Sanjaya D. Perera, Anjalee D. Liyanage, Nour Nijem, John P. Ferraris, more

Journal of Power Sources > 2013 > 230 > Complete > 130-137

Vanadium oxide has attracted interest for energy storage applications due to its high theoretical capacitance and stable layered structure. The low electronic conductivity, of V ₂ O ₅ necessitates combining with conducting materials, typically carbon. However combining with conductive carbon materials may require binders, which compromise the active surface. In this study, V ₂...

article

Innentitelbild: Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence (Angew. Chem. 6/2013)

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie > 125 > 6 > 1640 - 1640

Gasadsorptionsmechanismen müssen auf molekularer Ebene verstanden werden, um zu einer rationalen Entwicklung von Materialien zu gelangen, die schädliche Treibhausgase aus der Atmosphäre entfernen können. In ihrer Zuschrift auf S. 1736 ff. beschreiben J. Li und J. B. Parise et al. die Adsorption von CO₂‐Molekülen in einer Tasche aus zwei aromatischen Ringen eines nanoporösen Koordinationsgerüsts. Die...

article

Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie > 125 > 6 > 1736 - 1739

Gefangen in einem porösen Material: Die Position von adsorbiertem CO₂ in einem nanoprösen Koordinationsgerüst wurde durch eine Kombination verschiedener Methoden, wie Einkristallröntgenbeugung, In‐Situ‐Pulverdiffraktometrie und theoretische Studien, bestimmt. Die Ergebnisse zeigen, dass das adsorbierte CO₂‐Molekül in einer Tasche zwischen zwei Phenylringen bleibt und mit der aromatischen Elektronendichte...

article

Inside Cover: Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence (Angew. Chem. Int. Ed. 6/2013)

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie International Edition > 52 > 6 > 1598 - 1598

Understanding of gas adsorption mechanisms at the molecular level is vital for the rational development of compounds that can remove harmful greenhouse gases from the atmosphere. In their Communication on page 1692 ff., J. Li and J. B. Parise et al. describe the adsorption of CO₂ molecules in a “pocket” between two aromatic rings of a nanoporous coordination network. The CO₂–framework interaction...

article

Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie International Edition > 52 > 6 > 1692 - 1695

Trapped in a porous material: The position of adsorbed CO₂ in a nanoporous coordination framework was determined using a combination of techniques including single‐crystal X‐ray diffraction, in situ X‐ray powder diffraction coupled with differential scanning calorimetry, and theoretical calculations. The study reveals that the adsorbed CO₂ stays in a “pocket” between two phenyl rings, interacting...

article

Wet chemical surface functionalization of oxide-free silicon

Peter Thissen, Oliver Seitz, Yves J. Chabal

Progress in Surface Science > 2012 > 87 > 9-12 > 272-290

Silicon is by far the most important semiconductor material in the microelectronic industry mostly due to the high quality of the Si/SiO ₂ interface. Consequently, applications requiring chemical functionalization of Si substrates have focused on molecular grafting of SiO ₂ surfaces. Unfortunately, there are practical problems affecting homogeneity and stability of many organic layers...

article

pH-dependent structure and energetics of H2O/MgO(100)

Peter Thissen, Vera Thissen, Stefan Wippermann, Yves J. Chabal, more

Surface Science > 2012 > 606 > 11-12 > 902-907

The structure and energetics of water on MgO(100) surfaces are studied by atomic force microscopy (AFM) and density-functional theory (DFT). Computationally, the adsorption of water monomers, small water clusters and water monolayers on MgO(100) surfaces is considered. The calculations predict the non-dissociative adsorption for water monomers. The potential energy surface for single monomers is characterized...

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INFONA - science communication portal

Search results for: Yves J. Chabal

Oxide-related defects in quantum dot containing Si-rich silicon nitride films

Oxidative Dehydrogenation of Cyclohexane and Cyclohexene over Y-doped CeO₂ Nanorods

Rational design of common transition metal-nitrogen-carbon catalysts for oxygen reduction reaction in fuel cells

Aqueous process to limit hydration of thin-film inorganic oxides

Mechanistic Studies of Dielectric Growth on Silicon

Ammonia modification of oxide-free Si(111) surfaces

Surface and Structural Investigation of a MnO_x Birnessite‐Type Water Oxidation Catalyst Formed under Photocatalytic Conditions

Spectroscopic evaluation of out-of-plane surface vibration bands from surface functionalization of graphite oxide by fluorination

Efficient Directed Energy Transfer through Size‐Gradient Nanocrystal Layers into Silicon Substrates

Precursor design and reaction mechanisms for the atomic layer deposition of metal films

Manganese oxide nanorod–graphene/vanadium oxide nanowire–graphene binder-free paper electrodes for metal oxide hybrid supercapacitors

Monolayer Doping via Phosphonic Acid Grafting on Silicon: Microscopic Insight from Infrared Spectroscopy and Density Functional Theory Calculations

Selective detection of olefins using a luminescent silver-functionalized metal organic framework, RPM3

Vanadium oxide nanowire – Graphene binder free nanocomposite paper electrodes for supercapacitors: A facile green approach

Innentitelbild: Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence (Angew. Chem. 6/2013)

Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence

Inside Cover: Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence (Angew. Chem. Int. Ed. 6/2013)

Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence

Wet chemical surface functionalization of oxide-free silicon

pH-dependent structure and energetics of H2O/MgO(100)

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