Adsorption structure of phenylphosphonic acid on an alumina surface

Yagyu, Shinjiro; Yoshitake, Michiko; Tsud, Nataliya; Chikyow, Toyohiro

doi:10.1016/j.apsusc.2009.05.110

Cited by 13 publications

(19 citation statements)

References 18 publications

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“…In Figures 7a-c, three spectra of PPAmodified surfaces clearly exhibit shape and intensity differences in the (C6H5-P) band at ~1150 cm -1 , indicating poor reproducibility and uniformity of PPA binding. Moreover, in the spectra shown by the purple and red lines for PPA, the presence of a broad, asymmetric band between 1200 and 1270 cm -1 suggests the appearance of free P=O bonds due to bidentate binding 63,64 . The spectrum shown by the blue line in the same figure shows a band at these frequencies far more intense than can be attributed to bidentate binding alone.…”

Section: Comparison Of Sams Formed With Different Deposition Methodsmentioning

confidence: 99%

“…A unique asymmetric and broad band at 1250 cm -1 is observed in the spectrum from the micro-contact printed sample (Figure 6b) that is assigned to the (P=O) mode from free P=O groups of molecules with bidentate binding 63,64 . Thus, in total, the PM-IRRA spectra from PPA- Collectively, this series of spectra from PA-modified surfaces suggests that soak-free techniques do not produce SAMs with uniform binding or close packing.…”

Section: Comparison Of Sams Formed With Different Deposition Methodsmentioning

confidence: 99%

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Effect of time and deposition method on quality of phosphonic acid modifier self-assembled monolayers on indium zinc oxide

Sang

Knesting

Bulusu

et al. 2016

Applied Surface Science

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Phosphonic acid (PA) self-assembled monolayers (SAMs) are utilized at critical interfaces between transparent conductive oxides (TCO) and organic active layers in organic photovoltaic devices (OPVs). The effects of PA deposition method and time on the formation of close-packed, high-quality monolayers is investigated here for SAMs fabricated by solution deposition, micro-contact printing, and spray coating. The solution deposition isotherm for pentafluorinated benzylphosphonic acid (F5BnPA) on indium-doped zinc oxide (IZO) is studied using polarization modulation-infrared reflection-absorption spectroscopy (PM-IRRAS) at room temperature as a model PA/IZO system. Fast surface adsorption occurs within the first min; however, well-oriented high-quality SAMs are reached only after ~48 h, presumably through a continual process of molecular adsorption/desorption and monolayer filling accompanied by molecular reorientation. Two other rapid, soak-free deposition techniques, micro-contact printing and spray coating, are also explored. SAM quality is compared for deposition of phenyl phosphonic acid (PPA), F13-octylphosphonic acid (F13OPA), and pentafluorinated benzyl phosphonic acid (F5BnPA) by solution deposition, micro-contact printing and spray coating using PM-IRRAS. In contrast to micro-contact printing and spray coating techniques, 48-168 h solution deposition at both room temperature and 70 °C result in contamination-and surface etch-free close-packed monolayers with good reproducibility. SAMs fabricated by microcontact printing and spray coating are much less well ordered.

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Section: Comparison Of Sams Formed With Different Deposition Methodsmentioning

confidence: 99%

Section: Comparison Of Sams Formed With Different Deposition Methodsmentioning

confidence: 99%

Effect of time and deposition method on quality of phosphonic acid modifier self-assembled monolayers on indium zinc oxide

Sang

Knesting

Bulusu

et al. 2016

Applied Surface Science

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“…Funct. [70][71][72][79][80][81][82] In the present case, it is all the more complicated due to the large number of bands present in this region of the spectra. 2017, 27, 1703576 Infrared spectra of all hybrid compounds exhibit a band at 1600 cm −1 ascribed to the P(O)(OH) group [70] as well as a band around 1220 cm −1 corresponding to the PO band ( Figure S26, Supporting Information).…”

Section: Characterizationmentioning

confidence: 81%

“…[75][76][77][78] In the case of phosphonic acids, the attribution of the IR bands is the subject of various contradictory assertions in the litterature. [70][71][72][79][80][81][82] In the present case, it is all the more complicated due to the large number of bands present in this region of the spectra. It is however possible to spot the fingerprint of each molecule in the corresponding hybrid compound with bands such as the ones present at 1604, 1469, 1446, and 1402 cm −1 that likely correspond to the CC rings stretching modes in the fluorene moieties.…”

Section: Characterizationmentioning

confidence: 99%

Layered Simple Hydroxides Functionalized by Fluorene‐Phosphonic Acids: Synthesis, Interface Theoretical Insights, and Magnetoelectric Effect

Evrard

Chaker

Roger

et al. 2017

Adv Funct Materials

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International audienceCopper- and cobalt-based layered simple hydroxides (LSH) are successfully functionalized by a series of fluorene mono- and diphosphonic acids, using anionic exchange reactions and a preintercalation strategy. The lateral functionalization of the fluorene moieties has only little impact on the overall structure of the obtained layered hybrid materials but it influences the organization of the molecules within the interlamellar spacing. For bulky fluorene (9,9-dioctyl derivative), luminescence is preserved when inserted into copper and cobalt hydroxydes, whereas it is completely quenched for the other fluorenes. Detailed characterization of the internal structure and chemical bonding properties for copper- and cobalt-based hybrids is performed via ancillary experimental techniques. For the copper-based LSH class, for which more elusive findings are found, first-principles molecular dynamics simulations unravel the fundamental stabilizing role of the H-bonding network promoted within the local environments of the fluorene mono- and diphosphonic acids. The cobalt series of compounds constitute a new class of hybrid magnets, with ordering temperatures ranging from 11.8 to 17.8 K and show a clear magnetoelectric effect. This effect appears above a threshold magnetic field, which is null below the magnetic ordering temperature, and it persists in the paramagnetic regime till about 110 K

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“…P-C, CH 2 rocking). [30][31][32] The C=O band is absent from the spectrum of Co,Mo-3 and instead two bands at 1605 and 1400 cm -1 are observed, which are typical of the asymmetric ν as (COO -) and symmetric ν s (COO -) stretching of the coordinated carboxylate group. The ∆ν=(ν as -ν s )=250 cm -1 indicates a unidentate coordination of the carboxylate.…”

Section: Resultsmentioning

confidence: 97%

The Importance of Ligand Selection on the Formation of Bimetallic Phosphide Catalysts Derived from Metal-Organic Frameworks

El-Refaei¹,

Russo²,

Amsalem³

et al. 2019

Preprint

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Coordination polymers (CPs) and metal-organic frameworks (MOFs) have emerged as versatile precursors for transition-metal phosphides catalysts. However, the controlled synthesis of MOF-derived bimetallic phosphides remains a challenge, as mixtures of various phosphide phases are often formed. Here, it is shown that controlling the formation of pure CoMoP and CoMoP2 requires a careful choice of the ligands used to construct the MOF precursors, based on the chemical properties of the metals. In particular, the nature and number of the coordination moieties of the ligand play a key role. CoMoP and CoMoP2 particles coated with N-doped carbon were derived from phosphonate-based MOFs and compared as hydrogen evolution reaction (HER) electrocatalysts in acidic medium. CoMoP2 is more active and shows a turnover frequency (TOF) of 0.9 s-1 compared to 0.4 s-1 for CoMoP. The higher intrinsic activity of the CoMoP2 catalytic sites correlates with the differences in the electronic structure of the materials, with a larger charge transfer from the molybdenum to the phosphorous found for CoMoP2.

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Adsorption structure of phenylphosphonic acid on an alumina surface

Cited by 13 publications

References 18 publications

Effect of time and deposition method on quality of phosphonic acid modifier self-assembled monolayers on indium zinc oxide

Effect of time and deposition method on quality of phosphonic acid modifier self-assembled monolayers on indium zinc oxide

Layered Simple Hydroxides Functionalized by Fluorene‐Phosphonic Acids: Synthesis, Interface Theoretical Insights, and Magnetoelectric Effect

The Importance of Ligand Selection on the Formation of Bimetallic Phosphide Catalysts Derived from Metal-Organic Frameworks

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