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Journal of Physical Chemistry. C, Nanomaterials and Interfaces

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https://www.readbyqxmd.com/read/28620448/influence-of-film-and-substrate-structure-on-photoelectron-momentum-maps-of-coronene-thin-films-on-ag-111
#1
Christian Udhardt, Felix Otto, Christian Kern, Daniel Lüftner, Tobias Huempfner, Tino Kirchhuebel, Falko Sojka, Matthias Meissner, Bernd Schröter, Roman Forker, Peter Puschnig, Torsten Fritz
Angle-resolved ultraviolet photoelectron spectroscopy (ARUPS) was measured for one-monolayer coronene films deposited on Ag(111). The (kx ,ky )-dependent photoelectron momentum maps (PMMs), which were extracted from the ARUPS data by cuts at fixed binding energies, show finely structured patterns for the highest and the second-highest occupied molecular orbitals. While the substructure of the PMM main features is related to the 4 × 4 commensurate film structure, various features with three-fold symmetry imply an additional influence of the substrate...
June 8, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28620447/photoelectrochemistry-by-design-tailoring-the-nanoscale-structure-of-pt-nio-composites-leads-to-enhanced-photoelectrochemical-hydrogen-evolution-performance
#2
András Sápi, András Varga, Gergely F Samu, Dorina Dobó, Koppány L Juhász, Bettina Takács, Erika Varga, Ákos Kukovecz, Zoltán Kónya, Csaba Janáky
Photoelectrochemical hydrogen evolution is a promising avenue to store the energy of sunlight in the form of chemical bonds. The recent rapid development of new synthetic approaches enables the nanoscale engineering of semiconductor photoelectrodes, thus tailoring their physicochemical properties toward efficient H2 formation. In this work, we carried out the parallel optimization of the morphological features of the semiconductor light absorber (NiO) and the cocatalyst (Pt). While nanoporous NiO films were obtained by electrochemical anodization, the monodisperse Pt nanoparticles were synthesized using wet chemical methods...
June 8, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28603579/in-situ-optical-reflectance-difference-observations-of-co-oxidation-over-pd-100
#3
Willem G Onderwaater, Andriy Taranovskyy, Gertjan C van Baarle, Joost W M Frenken, Irene M N Groot
Using a home-built reflectometer, we have investigated the changes in the optical reflectivity of a Pd(100) model catalyst during CO oxidation under high-pressure, high-temperature conditions. We observe changes in optical contrast when exposing the surface to CO oxidation conditions at 200 mbar from room temperature up to 400 °C. These changes in reflectivity are a result both of the formation of a surface oxide layer and of a change in surface roughness because of gas exposure. However, the reflectivity is more sensitive to the presence of a thin, flat oxide layer than to surface roughness...
June 1, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28596812/hydrogen-chemical-configuration-and-thermal-stability-in-tungsten-disulfide-nanoparticles-exposed-to-hydrogen-plasma
#4
Alex Laikhtman, Gennady Makrinich, Meltem Sezen, Melike Mercan Yildizhan, Jose I Martinez, Doru Dinescu, Mariana Prodana, Marius Enachescu, Julio A Alonso, Alla Zak
The chemical configuration and interaction mechanism of hydrogen adsorbed in inorganic nanoparticles of WS2 are investigated. Our recent approaches of using hydrogen activated by either microwave or radiofrequency plasma dramatically increased the efficiency of its adsorption on the nanoparticles surface. In the current work we make an emphasis on elucidation of the chemical configuration of the adsorbed hydrogen. This configuration is of primary importance as it affects its adsorption stability and possibility of release...
June 1, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28572870/positively-and-negatively-charged-cesium-and-c60-m-cs-n-cluster-ions
#5
Michael Renzler, Lorenz Kranabetter, Marcelo Goulart, Paul Scheier, Olof Echt
We report on the formation and ionization of cesium and C60Cs clusters in superfluid helium nanodroplets. Size distributions of positively and negatively charged (C60) m Cs n(±) ions have been measured for m ≤ 7, n ≤ 12. Reproducible intensity anomalies are observed in high-resolution mass spectra. For both charge states, (C60) m Cs3(±) and (C60) m Cs5(±) are particularly abundant, with little dependence on the value of m. Distributions of bare cesium cluster ions also indicate enhanced stability of Cs3(±) and Cs5(±), in agreement with theoretical predictions...
May 25, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28553431/quantitative-analysis-of-electron-beam-damage-in-organic-thin-films
#6
Zino J W A Leijten, Arthur D A Keizer, Gijsbertus de With, Heiner Friedrich
In transmission electron microscopy (TEM) the interaction of an electron beam with polymers such as P3HT:PCBM photovoltaic nanocomposites results in electron beam damage, which is the most important factor limiting acquisition of structural or chemical data at high spatial resolution. Beam effects can vary depending on parameters such as electron dose rate, temperature during imaging, and the presence of water and oxygen in the sample. Furthermore, beam damage will occur at different length scales. To assess beam damage at the angstrom scale, we followed the intensity of P3HT and PCBM diffraction rings as a function of accumulated electron dose by acquiring dose series and varying the electron dose rate, sample preparation, and the temperature during acquisition...
May 18, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28539988/adsorption-study-of-a-water-molecule-on-vacancy-defected-nonpolar-cds-surfaces
#7
S S Gupta, M A van Huis
A detailed understanding of the water-semiconductor interface is of major importance for elucidating the molecular interactions at the photocatalyst's surface. Here, we studied the effect of vacancy defects on the adsorption of a water molecule on the (101̅0) and (112̅0) CdS surfaces, using spin-polarized density functional theory. We observed that the local spin polarization did not persist for most of the cationic vacancies on the surfaces, unlike in bulk, owing to surface reconstructions caused by displaced S atoms...
May 11, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28529675/role-of-dissociatively-adsorbed-water-on-the-formation-of-shallow-trapped-electrons-in-tio2-photocatalysts
#8
Anton Litke, Emiel J M Hensen, Jan P Hofmann
The mismatch between short lifetimes of free charge carriers and slow kinetics of surface redox reactions substantially limits the efficiency of most photocatalytic systems. Hence, the knowledge of trapping and recombination of photogenerated electrons and holes at different time scales is key for a rational optimization of photocatalytic materials. In this study, we used subsecond time-resolved diffuse-reflectance FTIR spectroscopy to investigate how energy and intensity of the incident irradiation affect the dynamics of photogenerated charge carriers in TiO2 P25 photocatalysts subjected to different pretreatments and how shallow trapped electrons (STE) are formed under these conditions...
May 11, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28479942/charge-carrier-trapping-processes-in-re2o2s-re-la-gd-y-and-lu
#9
Hongde Luo, Adrie J J Bos, Pieter Dorenbos
Two different charge carrier trapping processes have been investigated in RE2O2S:Ln(3+) (RE = La, Gd, Y, and Lu; Ln = Ce, Pr, and Tb) and RE2O2S:M (M = Ti(4+) and Eu(3+)). Cerium, praseodymium and terbium act as recombination centers and hole trapping centers while host intrinsic defects provide the electron trap. The captured electrons released from the intrinsic defects recombine at Ce(4+), Pr(4+), or Tb(4+) via the conduction band. On the other hand, Ti(4+) and Eu(3+) act as recombination centers and electron trapping centers while host intrinsic defects act as hole trapping centers...
April 27, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28479941/crystallization-kinetics-of-gesbte-phase-change-nanoparticles-resolved-by-ultrafast-calorimetry
#10
Bin Chen, Gert H Ten Brink, George Palasantzas, Bart J Kooi
Although nanostructured phase-change materials (PCMs) are considered as the building blocks of next-generation phase-change memory and other emerging optoelectronic applications, the kinetics of the crystallization, the central property in switching, remains ambiguous in the high-temperature regime. Therefore, we present here an innovative exploration of the crystallization kinetics of Ge2Sb2Te5 (GST) nanoparticles (NPs) exploiting differential scanning calorimetry with ultrafast heating up to 40 000 K s(-1)...
April 20, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28413570/role-of-adsorbed-water-on-charge-carrier-dynamics-in-photoexcited-tio2
#11
Anton Litke, Yaqiong Su, Ionut Tranca, Thomas Weber, Emiel J M Hensen, Jan P Hofmann
Overall photocatalytic water splitting is one of the most sought after processes for sustainable solar-to-chemical energy conversion. The efficiency of this process strongly depends on charge carrier recombination and interaction with surface adsorbates at different time scales. Here, we investigated how hydration of TiO2 P25 affects dynamics of photogenerated electrons at the millisecond to minute time scale characteristic for chemical reactions. We used rapid scan diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS)...
April 6, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28408968/effect-of-ring-strain-on-the-charge-transport-of-a-robust-norbornadiene-quadricyclane-based-molecular-photoswitch
#12
Behabitu E Tebikachew, Haipeng B Li, Alessandro Pirrotta, Karl Börjesson, Gemma C Solomon, Joshua Hihath, Kasper Moth-Poulsen
Integrating functional molecules into single-molecule devices is a key step toward the realization of future computing machines based on the smallest possible components. In this context, photoswitching molecules that can make a transition between high and low conductivity in response to light are attractive candidates. Here we present the synthesis and conductance properties of a new type of robust molecular photothermal switch based on the norbornadiene (NB)-quadricyclane (QC) system. The transport through the molecule in the ON state is dominated by a pathway through the π-conjugated system, which is no longer available when the system is switched to the OFF state...
April 6, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28413569/adsorption-and-dissociation-of-co2-on-ru-0001
#13
M Pachecka, J M Sturm, C J Lee, F Bijkerk
The adsorption and dissociation of carbon dioxide on a Ru(0001) single crystal surface was investigated by reflection-absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) spectroscopy for CO2 adsorbed at 85 K. RAIRS spectroscopy shows that the adsorption of CO2 on a Ru(0001) single crystal is partially dissociative, resulting in CO2 and CO. The CO vibrational mode was also observed to split into two distinct modes, indicating two general populations of CO present at the surface...
March 30, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28413568/triphenylamine-based-push-pull-molecule-for-photovoltaic-applications-from-synthesis-to-ultrafast-device-photophysics
#14
Oleg V Kozlov, Xiaomeng Liu, Yuriy N Luponosov, Alexander N Solodukhin, Victoria Y Toropynina, Jie Min, Mikhail I Buzin, Svetlana M Peregudova, Christoph J Brabec, Sergei A Ponomarenko, Maxim S Pshenichnikov
Small push-pull molecules attract much attention as prospective donor materials for organic solar cells (OSCs). By chemical engineering, it is possible to combine a number of attractive properties such as broad absorption, efficient charge separation, and vacuum and solution processabilities in a single molecule. Here we report the synthesis and early time photophysics of such a molecule, TPA-2T-DCV-Me, based on the triphenylamine (TPA) donor core and dicyanovinyl (DCV) acceptor end group connected by a thiophene bridge...
March 30, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28392884/generalizing-extending-and-maximizing-nitrogen-15-hyperpolarization-induced-by-parahydrogen-in-reversible-exchange
#15
Johannes F P Colell, Angus W J Logan, Zijian Zhou, Roman V Shchepin, Danila A Barskiy, Gerardo X Ortiz, Qiu Wang, Steven J Malcolmson, Eduard Y Chekmenev, Warren S Warren, Thomas Theis
Signal Amplification by Reversible Exchange (SABRE) is a fast and convenient NMR hyperpolarization method that uses cheap and readily available para-hydrogen as a hyperpolarization source. SABRE can hyperpolarize protons and heteronuclei. Here we focus on the heteronuclear variant introduced as SABRE-SHEATH (SABRE in SHield Enables Alignment Transfer to Heteronuclei) and nitrogen-15 targets in particular. We show that (15)N-SABRE works more efficiently and on a wider range of substrates than (1)H-SABRE, greatly generalizing the SABRE approach...
March 30, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28286598/polarizable-force-fields-for-co2-and-ch4-adsorption-in-m-mof-74
#16
Tim M Becker, Jurn Heinen, David Dubbeldam, Li-Chiang Lin, Thijs J H Vlugt
The family of M-MOF-74, with M = Co, Cr, Cu, Fe, Mg, Mn, Ni, Ti, V, and Zn, provides opportunities for numerous energy related gas separation applications. The pore structure of M-MOF-74 exhibits a high internal surface area and an exceptionally large adsorption capacity. The chemical environment of the adsorbate molecule in M-MOF-74 can be tuned by exchanging the metal ion incorporated in the structure. To optimize materials for a given separation process, insights into how the choice of the metal ion affects the interaction strength with adsorbate molecules and how to model these interactions are essential...
March 2, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28286597/extending-the-lifetime-of-hyperpolarized-propane-gas-through-reversible-dissolution
#17
Dudari B Burueva, Alexey S Romanov, Oleg G Salnikov, Vladimir V Zhivonitko, Yu-Wen Chen, Danila A Barskiy, Eduard Y Chekmenev, Dennis W Hwang, Kirill V Kovtunov, Igor V Koptyug
Hyperpolarized (HP) propane produced by the parahydrogen-induced polarization (PHIP) technique has been recently introduced as a promising contrast agent for functional lung magnetic resonance (MR) imaging. However, its short lifetime due to a spin-lattice relaxation time T1 of less than 1 s in the gas phase is a significant translational challenge for its potential biomedical applications. The previously demonstrated approach for extending the lifetime of the HP propane state through long-lived spin states allows the HP propane lifetime to be increased by a factor of ∼3...
March 2, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28286596/confinement-effects-for-lithium-borohydride-comparing-silica-and-carbon-scaffolds
#18
Suwarno, Peter Ngene, Angeloclaudio Nale, Tamara M Eggenhuisen, Martin Oschatz, Jan Peter Embs, Arndt Remhof, Petra E de Jongh
LiBH4 is a promising material for hydrogen storage and as a solid-state electrolyte for Li ion batteries. Confining LiBH4 in porous scaffolds improves its hydrogen desorption kinetics, reversibility, and Li(+) conductivity, but little is known about the influence of the chemical nature of the scaffold. Here, quasielastic neutron scattering and calorimetric measurements were used to study support effects for LiBH4 confined in nanoporous silica and carbon scaffolds. Pore radii were varied from 8 Å to 20 nm, with increasing confinement effects observed with decreasing pore size...
March 2, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28316756/photon-reabsorption-in-mixed-cspbcl3-cspbi3-perovskite-nanocrystal-films-for-light-emitting-diodes
#19
Nathaniel J L K Davis, Francisco J de la Peña, Maxim Tabachnyk, Johannes M Richter, Robin D Lamboll, Edward P Booker, Florencia Wisnivesky Rocca Rivarola, James T Griffiths, Caterina Ducati, S Matthew Menke, Felix Deschler, Neil C Greenham
Cesium lead halide nanocrystals, CsPbX3 (X = Cl, Br, I), exhibit photoluminescence quantum efficiencies approaching 100% without the core-shell structures usually used in conventional semiconductor nanocrystals. These high photoluminescence efficiencies make these crystals ideal candidates for light-emitting diodes (LEDs). However, because of the large surface area to volume ratio, halogen exchange between perovskite nanocrystals of different compositions occurs rapidly, which is one of the limiting factors for white-light applications requiring a mixture of different crystal compositions to achieve a broad emission spectrum...
February 23, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28303168/nayf4-er-3-yb-3-sio2-core-shell-upconverting-nanocrystals-for-luminescence-thermometry-up-to-900-k
#20
Robin G Geitenbeek, P Tim Prins, Wiebke Albrecht, Alfons van Blaaderen, Bert M Weckhuysen, Andries Meijerink
The rapid development of nanomaterials with unique size-tunable properties forms the basis for a variety of new applications, including temperature sensing. Luminescent nanoparticles (NPs) have demonstrated potential as sensitive nanothermometers, especially in biological systems. Their small size offers the possibility of mapping temperature profiles with high spatial resolution. The temperature range is however limited, which prevents use in high-temperature applications such as, for example, nanoelectronics, thermal barrier coatings, and chemical reactors...
February 16, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
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