ABRAHAM ULMAN - Academia.edu (original) (raw)

Papers by ABRAHAM ULMAN

Biomaterials, 2006

'l'his papcr dcscribcs the preparation and wctting propcrtics of tuo-cor.nponcnt scllasscntble-d ... more 'l'his papcr dcscribcs the preparation and wctting propcrtics of tuo-cor.nponcnt scllasscntble-d monolavcrs (SAMs) obtaincd hv the compctitivc ailsorption ol'onc short-chain (HS(CHr)r,,Sh) and onc long-chain (HS(('H:):,1-g) alkanethiol onto golci l'rom clilutc cthanolic solutions. The'four possiblc combinations ol thc tail groups CH, ancl CH.

OTHER PUBLICATIONS Matsumoto et al., “Nonlinear Optical Properties of an Azo Dye Attached Polymer... more OTHER PUBLICATIONS Matsumoto et al., “Nonlinear Optical Properties of an Azo Dye Attached Polymer”, App. Phys. Lett., vol. 51, No. 1, July 1987, pp. 1 and 2. D. J. Williams, “Organic Polymeric and Non-Polym eric Materials with Large Optical Nonlinearities”, An gew. Chem. Int. Ed. Engl. 23 (1984), 690-703. , Zyss, “Nonlinear Organic Materials for Integrated Op tics”, Journal of Molecular Electronics, vol. 1, pp. 25-45, 1985. Girling et al., “Observation of Second Harmonic Gen eration from a Langmuir-Blodgett Monolayer of a Merocyanine Dye”, Electronics Letters, vol. 21, No. 5, 2/28/ 85. (List continued on next page.)

Cluster Models for Surface and Bulk Phenomena

We have performed RECP Hartree-Fock + MBPT2 calculations of the equilibrium adsorbate structures ... more We have performed RECP Hartree-Fock + MBPT2 calculations of the equilibrium adsorbate structures and force constants of SH and SCH3 chemisorbed on the Au(111) and Au(100) surfaces. We propose coverage schemes for thio-alkyl adsorbates for both surfaces. On both surfaces and for both adsorbates we find the surface -S-X angle to be linear in the hollow site. The on-top site is an energy maximum on both surfaces. The bonding scheme between the sulfur atom and the gold surface possesses sigma and pi character. A significant amount of backbonding is evident in these systems through the mixing of the (fully occupied) sulfur pi orbitals and the unoccupied pi orbitals of the cluster model of the surface. We attribute the straightening of the surface -S-X angle in going from the on-top site to the hollow site to the backbonding interaction. The force field parameters and structures we determine are necessary for molecular dynamics studies of self-assembling thio-alkyl monolayers on gold. We propose coverage schemes that are consistent with available observational data.

ACS Symposium Series

... 10. Whitesides, GM; Simanek, Ε. E.; Mathias, JP; Seto, CT; Chin, DN; Mammen, M.; Gordon, DM A... more ... 10. Whitesides, GM; Simanek, Ε. E.; Mathias, JP; Seto, CT; Chin, DN; Mammen, M.; Gordon, DM Acc. Chem. Res. ... 15. Budach, W.; Ahuja, RC; Mobius, D.; Schrepp, W. Thin Solid Films 1992, 210/211, 434. 16. Rojas, MT; Koniger, R.; Stoddart, JF; Kaifer, AE J. Am. Chem. Soc. ...

The Journal of Physical Chemistry

... constants in the equation14 (5) Cu = ux - CTy where X and Yare the substituents on the 4-and ... more ... constants in the equation14 (5) Cu = ux - CTy where X and Yare the substituents on the 4-and 4'-positions (111). m “Y I 111 In Figure 1 the experimental dipole moments are plotted as a function of the calculated values. There is a ...

MRS Proceedings

ABSTRACTIn this paper, we demonstrate a “Plug and Play” approach, whereby externally synthesized ... more ABSTRACTIn this paper, we demonstrate a “Plug and Play” approach, whereby externally synthesized nanoparticles of desired functions and size are incorporated into the semiconductor, followed by the manipulation of surface chemical bonds in order to achieve multiple functionality. Sonochemically synthesised Fe2O3 nanoparticles were introduced onto device quality Si wafers. On annealing the particle-treated Si wafer in ultra high vacuum, oxygen changes the bonding partner from Fe to Si and desorb as SiO at ∼ 760°C, leading to the formation of uniform sized Fe nanoparticles ( size ∼6-8 nm) on the surface and the sample shows ferromagnetic behaviour. More importantly, the particle treated Si exhibits light emission at wavelengths 1.57, 1.61 and 1.65 microns (full width at half maximum ∼ 20 meV). Emission in this wavelength range is crucial for optical communications and is highly desired from a Si based material. Further, oxidation of this material leads to the formation of a selective ...

Supramolecular Science

X-ray photoelectron spectroscopy was used to explore the local environment of a perfluorinated th... more X-ray photoelectron spectroscopy was used to explore the local environment of a perfluorinated thiol derivative incorporated into an alkanethiol matrix. The alkanethiol octadecylmercaptan (ODT) was formed via a printing p.rocedure and samples taken at various stages of stamp depletion were investigated. Compared with the spectra obtained from a monolayer of the pertluorinated material adsorbed directly from solution, one can see distinct differences in the shape of the F 1s peak. We present possible interpretations of this behaviour from a molecular perspective.

MRS Bulletin, 1995

Formation of aggregates has been observed as a general phenomenon for a wide variety of organic m... more Formation of aggregates has been observed as a general phenomenon for a wide variety of organic molecules, especially aromatic compounds and dyes. Aggregation is most commonly encountered in crystals or in thin films. However, it has been increasingly observed in microheterogenous media or in other situations where high local concentrations occur or where specific orientation is favored. Two limiting types of aggregation have been defined based on the orientation of transition dipoles and their absorption spectral characteristics. These are the “J” aggregate, in which head-to-tail arrangements of transitiondipole moments are characterized by a sharp, intense, red-shifted transition compared to the isolated (solvated) monomer, and the “H” aggregate, where head-to-head (card-pack) orientations are characterized by a blue shift of the prominent transition compared with the monomer. Several treatments have been proposed to correlate the observed spectral shifts with the aggregate struct...

MRS Bulletin, 1995

When the first paper describing the formation of self-assembled monolayers (SAMs) of octadecyltri... more When the first paper describing the formation of self-assembled monolayers (SAMs) of octadecyltrichlorosilane [CH3(CH2)17SCl3, or OTS] by adsorption on SiO2was published, it could not have been predicted that this area of research would become so important in only one decade. Although Zisman was the first to discover that monolayers can be prepared by adsorption of a surfactant onto a clean metal surface, the real revolution in the field occurred when Nuzzo and Allara showed that SAMs of alkanethiolates on gold can be prepared by adsorption of di-n-alkyl disulfides from dilute solutions. A decrease in the use of moisture-sensitive alkyl trichlorosilanes and the increased use of crystalline gold surfaces were two important reasons for the success of these SAMs. Indeed, monolayers of alkanethiolates on gold are the most studied SAMs to date and thus deserve the most detailed discussion.SAMs have been intensively studied in the past few years because of their relevance to science and t...

Thin Films, 2002

Physics of Thin Films is one of the longest running continuing series in thin film science, consi... more Physics of Thin Films is one of the longest running continuing series in thin film science, consisting of 25 volumes since 1963. The series contains quality studies of the properties of various thin films materials and systems. In order to be able to reflect the development of today's science and to cover all modern aspects of thin films, the series, starting with Volume 20, has moved beyond the basic physics of thin films. It now addresses the most important aspects of both inorganic and organic thin films, in both their theoretical and their technological aspects. Volume 29 consists of chapters pulled from Hari Singh Nalwa's forthcoming Handbook of Thin Film Materials (ISBN: 0-12-512908-4). The chapters were selected because they deal exclusively with amorphous film structures and because they have a common relevance to semiconductor, or electronic, devices and circuits. These are subjects not yet stressed in the Thin Films series.

J Am Chem Soc, 1991

Page 1. J. Am. Chem. SOC. 1991, 113, 5866-5868 5866 Scbeme Io f g 7-10-2 w&am... more Page 1. J. Am. Chem. SOC. 1991, 113, 5866-5868 5866 Scbeme Io f g 7-10-2 w&: a,b <; -9-c,d f 11 - g 3 5 OH -7 4 7; R' = H, RZ = R3 = EDGlcNAc; 8; R' = H, RZ = R3 = PhCO 9; R' = EDGlcNAc, R2 = R3 = H 10; R'= H. R2 = R3= BDGd(14) BDGIcNAc ...

Langmuir, 1990

... A Novel Self -Assembled Monolayer Film Containing a Sulfone-Substituted Aromatic Group Nolan ... more ... A Novel Self -Assembled Monolayer Film Containing a Sulfone-Substituted Aromatic Group Nolan Tillman, Abraham Ulman,* and James %. Elman ... In Techniques of Chemistry; Weissberger, A., Rossiter, B., Ede; Wiley: New York, 1972; Vol. 1, Part IIIC, p 453. lb I 3 4 I ...

Journal of the American Chemical Society Jacs, 2005

The synthesis of organthiols and their assembly into monolayers on gold, P.E. Laibinis et al The ... more The synthesis of organthiols and their assembly into monolayers on gold, P.E. Laibinis et al The kinetics and thermodynamics of monolayer formation - in situ measurement of alkanethiol adsorption onto gold, G.J. Blanchard et al Atomic force microscopy studies on self-assembled monolayers of thiols, G. Liu et al X-ray and the HeAtom diffraction studies of self-assembled monolayers, P. Fenter The structure of alkanethiol films on liquid mercury - an X-ray study, M. Deutsch et al NMR spectroscopy of self-assembled monolayers, L. Reven Simulations of self-assembled monolayers of thiols on gold, J.I. Siepmann, I.R. McDonald Microcontact printing of SAMs, J. Tien et al.

Biomaterials, 2006

'l'his papcr dcscribcs the preparation and wctting propcrtics of tuo-cor.nponcnt scllasscntble-d ... more 'l'his papcr dcscribcs the preparation and wctting propcrtics of tuo-cor.nponcnt scllasscntble-d monolavcrs (SAMs) obtaincd hv the compctitivc ailsorption ol'onc short-chain (HS(CHr)r,,Sh) and onc long-chain (HS(('H:):,1-g) alkanethiol onto golci l'rom clilutc cthanolic solutions. The'four possiblc combinations ol thc tail groups CH, ancl CH.

OTHER PUBLICATIONS Matsumoto et al., “Nonlinear Optical Properties of an Azo Dye Attached Polymer... more OTHER PUBLICATIONS Matsumoto et al., “Nonlinear Optical Properties of an Azo Dye Attached Polymer”, App. Phys. Lett., vol. 51, No. 1, July 1987, pp. 1 and 2. D. J. Williams, “Organic Polymeric and Non-Polym eric Materials with Large Optical Nonlinearities”, An gew. Chem. Int. Ed. Engl. 23 (1984), 690-703. , Zyss, “Nonlinear Organic Materials for Integrated Op tics”, Journal of Molecular Electronics, vol. 1, pp. 25-45, 1985. Girling et al., “Observation of Second Harmonic Gen eration from a Langmuir-Blodgett Monolayer of a Merocyanine Dye”, Electronics Letters, vol. 21, No. 5, 2/28/ 85. (List continued on next page.)

Cluster Models for Surface and Bulk Phenomena

We have performed RECP Hartree-Fock + MBPT2 calculations of the equilibrium adsorbate structures ... more We have performed RECP Hartree-Fock + MBPT2 calculations of the equilibrium adsorbate structures and force constants of SH and SCH3 chemisorbed on the Au(111) and Au(100) surfaces. We propose coverage schemes for thio-alkyl adsorbates for both surfaces. On both surfaces and for both adsorbates we find the surface -S-X angle to be linear in the hollow site. The on-top site is an energy maximum on both surfaces. The bonding scheme between the sulfur atom and the gold surface possesses sigma and pi character. A significant amount of backbonding is evident in these systems through the mixing of the (fully occupied) sulfur pi orbitals and the unoccupied pi orbitals of the cluster model of the surface. We attribute the straightening of the surface -S-X angle in going from the on-top site to the hollow site to the backbonding interaction. The force field parameters and structures we determine are necessary for molecular dynamics studies of self-assembling thio-alkyl monolayers on gold. We propose coverage schemes that are consistent with available observational data.

ACS Symposium Series

... 10. Whitesides, GM; Simanek, Ε. E.; Mathias, JP; Seto, CT; Chin, DN; Mammen, M.; Gordon, DM A... more ... 10. Whitesides, GM; Simanek, Ε. E.; Mathias, JP; Seto, CT; Chin, DN; Mammen, M.; Gordon, DM Acc. Chem. Res. ... 15. Budach, W.; Ahuja, RC; Mobius, D.; Schrepp, W. Thin Solid Films 1992, 210/211, 434. 16. Rojas, MT; Koniger, R.; Stoddart, JF; Kaifer, AE J. Am. Chem. Soc. ...

The Journal of Physical Chemistry

... constants in the equation14 (5) Cu = ux - CTy where X and Yare the substituents on the 4-and ... more ... constants in the equation14 (5) Cu = ux - CTy where X and Yare the substituents on the 4-and 4'-positions (111). m “Y I 111 In Figure 1 the experimental dipole moments are plotted as a function of the calculated values. There is a ...

MRS Proceedings

ABSTRACTIn this paper, we demonstrate a “Plug and Play” approach, whereby externally synthesized ... more ABSTRACTIn this paper, we demonstrate a “Plug and Play” approach, whereby externally synthesized nanoparticles of desired functions and size are incorporated into the semiconductor, followed by the manipulation of surface chemical bonds in order to achieve multiple functionality. Sonochemically synthesised Fe2O3 nanoparticles were introduced onto device quality Si wafers. On annealing the particle-treated Si wafer in ultra high vacuum, oxygen changes the bonding partner from Fe to Si and desorb as SiO at ∼ 760°C, leading to the formation of uniform sized Fe nanoparticles ( size ∼6-8 nm) on the surface and the sample shows ferromagnetic behaviour. More importantly, the particle treated Si exhibits light emission at wavelengths 1.57, 1.61 and 1.65 microns (full width at half maximum ∼ 20 meV). Emission in this wavelength range is crucial for optical communications and is highly desired from a Si based material. Further, oxidation of this material leads to the formation of a selective ...

Supramolecular Science

X-ray photoelectron spectroscopy was used to explore the local environment of a perfluorinated th... more X-ray photoelectron spectroscopy was used to explore the local environment of a perfluorinated thiol derivative incorporated into an alkanethiol matrix. The alkanethiol octadecylmercaptan (ODT) was formed via a printing p.rocedure and samples taken at various stages of stamp depletion were investigated. Compared with the spectra obtained from a monolayer of the pertluorinated material adsorbed directly from solution, one can see distinct differences in the shape of the F 1s peak. We present possible interpretations of this behaviour from a molecular perspective.

MRS Bulletin, 1995

Formation of aggregates has been observed as a general phenomenon for a wide variety of organic m... more Formation of aggregates has been observed as a general phenomenon for a wide variety of organic molecules, especially aromatic compounds and dyes. Aggregation is most commonly encountered in crystals or in thin films. However, it has been increasingly observed in microheterogenous media or in other situations where high local concentrations occur or where specific orientation is favored. Two limiting types of aggregation have been defined based on the orientation of transition dipoles and their absorption spectral characteristics. These are the “J” aggregate, in which head-to-tail arrangements of transitiondipole moments are characterized by a sharp, intense, red-shifted transition compared to the isolated (solvated) monomer, and the “H” aggregate, where head-to-head (card-pack) orientations are characterized by a blue shift of the prominent transition compared with the monomer. Several treatments have been proposed to correlate the observed spectral shifts with the aggregate struct...

MRS Bulletin, 1995

When the first paper describing the formation of self-assembled monolayers (SAMs) of octadecyltri... more When the first paper describing the formation of self-assembled monolayers (SAMs) of octadecyltrichlorosilane [CH3(CH2)17SCl3, or OTS] by adsorption on SiO2was published, it could not have been predicted that this area of research would become so important in only one decade. Although Zisman was the first to discover that monolayers can be prepared by adsorption of a surfactant onto a clean metal surface, the real revolution in the field occurred when Nuzzo and Allara showed that SAMs of alkanethiolates on gold can be prepared by adsorption of di-n-alkyl disulfides from dilute solutions. A decrease in the use of moisture-sensitive alkyl trichlorosilanes and the increased use of crystalline gold surfaces were two important reasons for the success of these SAMs. Indeed, monolayers of alkanethiolates on gold are the most studied SAMs to date and thus deserve the most detailed discussion.SAMs have been intensively studied in the past few years because of their relevance to science and t...

Thin Films, 2002

Physics of Thin Films is one of the longest running continuing series in thin film science, consi... more Physics of Thin Films is one of the longest running continuing series in thin film science, consisting of 25 volumes since 1963. The series contains quality studies of the properties of various thin films materials and systems. In order to be able to reflect the development of today's science and to cover all modern aspects of thin films, the series, starting with Volume 20, has moved beyond the basic physics of thin films. It now addresses the most important aspects of both inorganic and organic thin films, in both their theoretical and their technological aspects. Volume 29 consists of chapters pulled from Hari Singh Nalwa's forthcoming Handbook of Thin Film Materials (ISBN: 0-12-512908-4). The chapters were selected because they deal exclusively with amorphous film structures and because they have a common relevance to semiconductor, or electronic, devices and circuits. These are subjects not yet stressed in the Thin Films series.

J Am Chem Soc, 1991

Page 1. J. Am. Chem. SOC. 1991, 113, 5866-5868 5866 Scbeme Io f g 7-10-2 w&am... more Page 1. J. Am. Chem. SOC. 1991, 113, 5866-5868 5866 Scbeme Io f g 7-10-2 w&: a,b <; -9-c,d f 11 - g 3 5 OH -7 4 7; R' = H, RZ = R3 = EDGlcNAc; 8; R' = H, RZ = R3 = PhCO 9; R' = EDGlcNAc, R2 = R3 = H 10; R'= H. R2 = R3= BDGd(14) BDGIcNAc ...

Langmuir, 1990

... A Novel Self -Assembled Monolayer Film Containing a Sulfone-Substituted Aromatic Group Nolan ... more ... A Novel Self -Assembled Monolayer Film Containing a Sulfone-Substituted Aromatic Group Nolan Tillman, Abraham Ulman,* and James %. Elman ... In Techniques of Chemistry; Weissberger, A., Rossiter, B., Ede; Wiley: New York, 1972; Vol. 1, Part IIIC, p 453. lb I 3 4 I ...

Journal of the American Chemical Society Jacs, 2005

The synthesis of organthiols and their assembly into monolayers on gold, P.E. Laibinis et al The ... more The synthesis of organthiols and their assembly into monolayers on gold, P.E. Laibinis et al The kinetics and thermodynamics of monolayer formation - in situ measurement of alkanethiol adsorption onto gold, G.J. Blanchard et al Atomic force microscopy studies on self-assembled monolayers of thiols, G. Liu et al X-ray and the HeAtom diffraction studies of self-assembled monolayers, P. Fenter The structure of alkanethiol films on liquid mercury - an X-ray study, M. Deutsch et al NMR spectroscopy of self-assembled monolayers, L. Reven Simulations of self-assembled monolayers of thiols on gold, J.I. Siepmann, I.R. McDonald Microcontact printing of SAMs, J. Tien et al.