G. Iucci | Roma Tre University, Rome, Italy (original) (raw)
Papers by G. Iucci
ABSTRACT Self-complementary amphiphilic oligopeptides, consisting of an alternation of hydrophobi... more ABSTRACT Self-complementary amphiphilic oligopeptides, consisting of an alternation of hydrophobic and hydrophilic amino acids and of positively and negatively charged groups can generate extended ordered structures by self-assembling (SA) from aqueous solutions, and have been successfully tested as promising candidates for scaffolds in several fields of tissue engineering. In this paper we present a systematic XPS, NEXAFS and FTIR investigation carried out on a series of SA peptides consisting of different selected sequences of 16 residues, with the aim of determining the effect of side chains length on molecular arrangement and orientation. Peptides were immobilized on the surface of titanium, a well known biocompatible material, or deposited as thick films on inert gold surfaces. FTIR analysis yields information on the backbone conformation. XPS spectroscopy was used to investigate the peptide adsorption on the TiO(2) surface. The orientation of the peptide chains was studied by angular-dependent NEXAFS. The performed spectroscopical characterization leads to widely investigate the physical properties of biopolymers-peptide coatings. (c) 2010 Elsevier B.V. All rights reserved.
Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato... more Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato/Pt assemblies, consisting of a Zn-porphyrinato (ZnPf) macrocycle inserted between bis(phosphine)platinum(II) centres, were carried out by means of synchrotron radiation-induced near-edge x-ray absorption fine structure (NEXAFS) spectroscopy at the third-generation storage ring ELETTRA and at SuperACO. The spectra of the monomeric ZnPf and of the porphyrin-free base were also investigated for comparison. Modifications occur mainly at the N K-edge, when Zn metallation is carried out, arising from nitrogen deprotonation, and significant changes are also observed upon linkage between subunits.
Introduction Nanostructured materials originating from transition metal coordination complexes an... more Introduction Nanostructured materials originating from transition metal coordination complexes and organic aromatic moieties are appealing for applications ranging from chemical sensors to optical devices and catalysts. In fact, an high surface area, typical of a nanostructured material, usually translate into high performance devices. Porphyrins and multiporphyrins are peculiar materials of specific interest, due to their properties appropriate for applications as active layers in optical sensors, optical switches and energy conversion devices. Furthermore, tetrapyrrolic molecules are usually talented to give rise to morphologically organized nanostructures. Recently, a significant endeavour has been applied to the improvement of new chromophores based on multiporphyrinic polymers suitable for constructing optoelectronic devices; in this framework, organometallic assemblies containing Zn-diethynylporphyrin (ZnDEP) coordinated to terminal -Pt(PBu3)2Cl and Pd(PBu3)2(C≡CPh) tethers we...
Materials Science and Engineering: C
Self-assembling peptides (SAPs) were investigated by means of XPS and Angular Dependent NEXAFS sp... more Self-assembling peptides (SAPs) were investigated by means of XPS and Angular Dependent NEXAFS spectroscopies, with the aim to probe the influence of pH and Ionic Strength conditions on the chemical structure and molecular organization of SAPs anchored on titania surfaces. XPS at the C1s, N1s, O1s core levels allowed to study surfaces and biomolecule/substrate interfaces. NEXAFS data allowed ascertaining that SAPs molecular structure is preserved upon grafting to the titania surface. Angular Dependent NEXAFS was used to investigate the influence of environmental conditions on the molecular organization behaviour. The objective of our study was to establish a set of methodologies for obtaining arrangements of well-organized biomolecules on scaffolds surfaces as a basic technology to develop and optimize cells adhesion and proliferation for tissue engineering applications.
The adsorption on TiO2 surface of two dipeptides AE (L-alanine-L-glutamic acid) and AK (L-alanine... more The adsorption on TiO2 surface of two dipeptides AE (L-alanine-L-glutamic acid) and AK (L-alanine-L-lysine), that are 'building blocks' of the more complex self-complementary amphiphilic oligopeptides and are therefore a good model in the interpretation of the complex peptide spectra, has been investigated both theoretically and experimentally. The chemical structure and composition of thin films of both dipeptides on TiO2 were
Journal of Biomedical Materials Research Part A, 2009
A fundamental goal in the field of implantology is the design of innovative devices suitable for ... more A fundamental goal in the field of implantology is the design of innovative devices suitable for promoting implant-to-tissue integration. This result can be achieved by means of surface modifications aimed at optimizing tissue regeneration. In the framework of oral and orthopedic implantology, surface modifications concern both the optimization of titanium/titanium alloy surface roughness and the attachment of biochemical factors able to guide cellular adhesion and/or growth. This article focuses on the covalent attachment of two different adhesive peptides to rough titanium disks. The capability of biomimetic surfaces to increase osteoblast adhesion and the specificity of their biological activity due to the presence of cell adhesion signal-motif have also been investigated. In addition, surface analyses by profilometry, X-ray photoelectron spectroscopy, and time of flight-secondary ion mass spectrometry have been carried out to investigate the effects and modifications induced by grafting procedures.
Synthetic Metals, 1992
ABSTRACT The electrical properties of iodine-doped poly(phenylacetylene) [PPA] solutions have bee... more ABSTRACT The electrical properties of iodine-doped poly(phenylacetylene) [PPA] solutions have been studied by means of low-frequency electrical conductivity and dielectric measurements in the frequency range 1 MHz-1 GHz. These data show that, in these systems, the conducting mechanism is different and more complicated than the typical additive behaviour of diluted ionic solutions. The high-frequency dielectric measurements display a pronounced dielectric dispersion characterized by a single Debye-type relaxation process. This dielectric behaviour can be attributed to the dipolar character of PPA, enhanced when the polymer interacts with the iodine doping species.
![Research paper thumbnail of The electronic structure of neutral and alkali metal-doped poly[3-(4-octylphenyl)thiophene] studied by photoelectron spectroscopy](https://attachments.academia-assets.com/71516552/thumbnails/1.jpg)
](Synthetic Metals, 1996
The electronic structure of neutral and alkali metal-doped poly [ 3-(4octylphenyl) thiophene] stu... more The electronic structure of neutral and alkali metal-doped poly [ 3-(4octylphenyl) thiophene] studied by photoelectron spectroscopy K.Z.
Surface and Interface Analysis, 2000
Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato... more Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato/Pt assemblies, consisting of a Zn-porphyrinato (ZnPf) macrocycle inserted between bis(phosphine)platinum(II) centres, were carried out by means of synchrotron radiation-induced near-edge x-ray absorption fine structure (NEXAFS) spectroscopy at the third-generation storage ring ELETTRA and at SuperACO. The spectra of the monomeric ZnPf and of the porphyrin-free base were also investigated for comparison. Modifications occur mainly at the N K-edge, when Zn metallation is carried out, arising from nitrogen deprotonation, and significant changes are also observed upon linkage between subunits.
Polymer, 1993
ABSTRACT The morphological evolution of as-grown poly(phenylacetylene) (PPA) free standing films ... more ABSTRACT The morphological evolution of as-grown poly(phenylacetylene) (PPA) free standing films has been studied. Investigations performed by scanning electron microscopy show that the freshly prepared PPA films exhibit a glass-like morphology which subsequently evolves into a microsphere structure. After ageing for 3 months at room temperature, PPA films reach a stable enamel-like phase. The chemical structure of the Rh(I) catalysts does not appear to influence the morphology of PPA. However, different catalysts yield different rates of morphological evolution.
Journal of Applied Polymer Science, 2011
ABSTRACT Biomimetic polymer nanofibers of poly(epsilon-caprolactone) and poly(L-lactide caprolact... more ABSTRACT Biomimetic polymer nanofibers of poly(epsilon-caprolactone) and poly(L-lactide caprolactone) copolymer were prepared by electrospinning. Modifications of the polymer nanofibers aimed at improving their biomimetic properties were performed by two different routes: (1) immobilization of an adhesion peptide, which mimicked the adhesion sequence of the extracellular matrix protein fibronectin, on the polymer surface and (2) incorporation of self-complementary oligopeptides, which showed alternated hydrophilic and hydrophobic side chain groups and was capable of generating extended ordered structures by self-assembling, into the polymer nanofibers. The structure of the polymer/peptide nanofibers was investigated by X-ray photoelectron and Fourier transform infrared spectroscopies. (C) 2011 Wiley Periodicals, Inc. j Appl Polym Sci 122: 3574-3582, 2011
Applied Surface Science, 1999
X-ray photoelectron spectroscopy was used in order to investigate the interface formation between... more X-ray photoelectron spectroscopy was used in order to investigate the interface formation between chromium and thin Ž. films of a newly synthesised p-conjugated polymer P PA-pNO PA ; the investigated material is a block copolymer 2 Ž. Ž. Äw Ž. Ž X. x consisting of phenylacetylene PA and para-nitro phenylacetylene pNO PA units-CH5C-R-CH5C-R-; 2 n mN X 4 R5C H , R 5C H NO. Chromium was evaporated stepwise in situ onto the polymer surface and the XPS spectra of the 6 5 6 4 2 substrate polymer and of the metal overlayer were studied as a function of increasing chromium thickness. In the early stages of the interface formation, chromium was found to interact mainly with the nitrogen atoms of the-NO groups, that are 2 reduced to nitride-like species; the NO bond is broken, as evidenced by the modifications occurring in the N1s and O1s spectra. The changes in the C1s spectra upon increasing metal deposition suggest the formation of a chromium-arene p-complex at low chromium coverage and of carbide-like species at higher chromium thickness.
A joint X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEX... more A joint X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS) investigation of the adsorption of phenylacetylene (PA, C 6 H 5 AC"CH) on the surface of Rh(1 0 0) single crystal was carried out by evaporating PA on the clean metal surface in the monolayer and multilayer regimes. The experimental results indicate that the interaction of the PA molecule with the Rh(1 0 0) surface involves mainly the two carbon atoms of the alkyne moiety; the binding of the alkyne group to the metal surface produces the opening of the triple bond. A comparison with the results obtained for PA adsorption on the surface of Pt (1 1 1) and Cu (1 0 0) is also discussed.
Polymers and Other Advanced Materials, 1995
Journal of peptide science : an official publication of the European Peptide Society, 2014
Hydrogels from self-assembling ionic complementary peptides have been receiving much interest fro... more Hydrogels from self-assembling ionic complementary peptides have been receiving much interest from the scientific community as mimetics of the extracellular matrix that can offer three-dimensional support for cell growth or become vehicles for the delivery of stem cells or drugs. These scaffolds have also been proposed as bone substitutes for small defects as they promote beneficial effects on human osteoblasts. In order to develop a novel bioactive titanium implant, we propose the introduction of a layer of ionic-complementary self-assembling peptides (EAbuK) on Ti whose surface has been previously sandblasted and acid etched. The peptide layer is anchored to the metal by covalent functionalization of titania with self-assembling sequences. The peptide layer has also been enriched by the insulin-like growth factor-1 incorporated to the layer and/or a conjugate obtained by chemoselective ligation between EAbuK and a sequence of 25 residues containing four GRGDSP motifs per chain. X-...
A new surface acoustic wave humidity sensor has been developed and tested. It is based on the use... more A new surface acoustic wave humidity sensor has been developed and tested. It is based on the use of a polyphenylacetylene (PPA) membrane which has already been utilized in the I,-doped form for the study of humidity sensors based on electrical conductivity responses. PPA shows physical properties which make it an almost ideal membrane for acoustic wave type sensors. Measurements performed on both Rayleigh and surface transverse waves have shown a high sensitivity of the device over a wide range of relative humidity values, a reversible behaviour together with a fairly fast response time.
Chemical Physics, 2001
C1s core level photoelectron studies have been performed in the gas phase for some conjugated org... more C1s core level photoelectron studies have been performed in the gas phase for some conjugated organic molecules, namely phenylacetylene, diethynylbiphenyl, diphenylbutadiyne and para-nitrophenylacetylene. The investigated systems consist of alkyne molecules with aromatic substituents and have been used as precursors for the synthesis of organic π-conjugated polymers. The experimental results were interpreted with the help of theoretical calculations: the ionization potentials
Synthetic Metals, 1996
The interaction of rubidium, a first group metal, with (α, ω-diphenyltetradecaheptaene) (DP7), a ... more The interaction of rubidium, a first group metal, with (α, ω-diphenyltetradecaheptaene) (DP7), a diphenylpolyene having seven double bonds in the polyene chain, has been studied by means of X-ray and UV photoelectron spectroscopy. DP7 can be considered as a model molecule for polyacetylene since the frontier π-orbitals are mainly localized on the polyene part of the molecule. The experimental data
ABSTRACT Self-complementary amphiphilic oligopeptides, consisting of an alternation of hydrophobi... more ABSTRACT Self-complementary amphiphilic oligopeptides, consisting of an alternation of hydrophobic and hydrophilic amino acids and of positively and negatively charged groups can generate extended ordered structures by self-assembling (SA) from aqueous solutions, and have been successfully tested as promising candidates for scaffolds in several fields of tissue engineering. In this paper we present a systematic XPS, NEXAFS and FTIR investigation carried out on a series of SA peptides consisting of different selected sequences of 16 residues, with the aim of determining the effect of side chains length on molecular arrangement and orientation. Peptides were immobilized on the surface of titanium, a well known biocompatible material, or deposited as thick films on inert gold surfaces. FTIR analysis yields information on the backbone conformation. XPS spectroscopy was used to investigate the peptide adsorption on the TiO(2) surface. The orientation of the peptide chains was studied by angular-dependent NEXAFS. The performed spectroscopical characterization leads to widely investigate the physical properties of biopolymers-peptide coatings. (c) 2010 Elsevier B.V. All rights reserved.
Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato... more Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato/Pt assemblies, consisting of a Zn-porphyrinato (ZnPf) macrocycle inserted between bis(phosphine)platinum(II) centres, were carried out by means of synchrotron radiation-induced near-edge x-ray absorption fine structure (NEXAFS) spectroscopy at the third-generation storage ring ELETTRA and at SuperACO. The spectra of the monomeric ZnPf and of the porphyrin-free base were also investigated for comparison. Modifications occur mainly at the N K-edge, when Zn metallation is carried out, arising from nitrogen deprotonation, and significant changes are also observed upon linkage between subunits.
Introduction Nanostructured materials originating from transition metal coordination complexes an... more Introduction Nanostructured materials originating from transition metal coordination complexes and organic aromatic moieties are appealing for applications ranging from chemical sensors to optical devices and catalysts. In fact, an high surface area, typical of a nanostructured material, usually translate into high performance devices. Porphyrins and multiporphyrins are peculiar materials of specific interest, due to their properties appropriate for applications as active layers in optical sensors, optical switches and energy conversion devices. Furthermore, tetrapyrrolic molecules are usually talented to give rise to morphologically organized nanostructures. Recently, a significant endeavour has been applied to the improvement of new chromophores based on multiporphyrinic polymers suitable for constructing optoelectronic devices; in this framework, organometallic assemblies containing Zn-diethynylporphyrin (ZnDEP) coordinated to terminal -Pt(PBu3)2Cl and Pd(PBu3)2(C≡CPh) tethers we...
Materials Science and Engineering: C
Self-assembling peptides (SAPs) were investigated by means of XPS and Angular Dependent NEXAFS sp... more Self-assembling peptides (SAPs) were investigated by means of XPS and Angular Dependent NEXAFS spectroscopies, with the aim to probe the influence of pH and Ionic Strength conditions on the chemical structure and molecular organization of SAPs anchored on titania surfaces. XPS at the C1s, N1s, O1s core levels allowed to study surfaces and biomolecule/substrate interfaces. NEXAFS data allowed ascertaining that SAPs molecular structure is preserved upon grafting to the titania surface. Angular Dependent NEXAFS was used to investigate the influence of environmental conditions on the molecular organization behaviour. The objective of our study was to establish a set of methodologies for obtaining arrangements of well-organized biomolecules on scaffolds surfaces as a basic technology to develop and optimize cells adhesion and proliferation for tissue engineering applications.
The adsorption on TiO2 surface of two dipeptides AE (L-alanine-L-glutamic acid) and AK (L-alanine... more The adsorption on TiO2 surface of two dipeptides AE (L-alanine-L-glutamic acid) and AK (L-alanine-L-lysine), that are 'building blocks' of the more complex self-complementary amphiphilic oligopeptides and are therefore a good model in the interpretation of the complex peptide spectra, has been investigated both theoretically and experimentally. The chemical structure and composition of thin films of both dipeptides on TiO2 were
Journal of Biomedical Materials Research Part A, 2009
A fundamental goal in the field of implantology is the design of innovative devices suitable for ... more A fundamental goal in the field of implantology is the design of innovative devices suitable for promoting implant-to-tissue integration. This result can be achieved by means of surface modifications aimed at optimizing tissue regeneration. In the framework of oral and orthopedic implantology, surface modifications concern both the optimization of titanium/titanium alloy surface roughness and the attachment of biochemical factors able to guide cellular adhesion and/or growth. This article focuses on the covalent attachment of two different adhesive peptides to rough titanium disks. The capability of biomimetic surfaces to increase osteoblast adhesion and the specificity of their biological activity due to the presence of cell adhesion signal-motif have also been investigated. In addition, surface analyses by profilometry, X-ray photoelectron spectroscopy, and time of flight-secondary ion mass spectrometry have been carried out to investigate the effects and modifications induced by grafting procedures.
Synthetic Metals, 1992
ABSTRACT The electrical properties of iodine-doped poly(phenylacetylene) [PPA] solutions have bee... more ABSTRACT The electrical properties of iodine-doped poly(phenylacetylene) [PPA] solutions have been studied by means of low-frequency electrical conductivity and dielectric measurements in the frequency range 1 MHz-1 GHz. These data show that, in these systems, the conducting mechanism is different and more complicated than the typical additive behaviour of diluted ionic solutions. The high-frequency dielectric measurements display a pronounced dielectric dispersion characterized by a single Debye-type relaxation process. This dielectric behaviour can be attributed to the dipolar character of PPA, enhanced when the polymer interacts with the iodine doping species.
Synthetic Metals, 1996
The electronic structure of neutral and alkali metal-doped poly [ 3-(4octylphenyl) thiophene] stu... more The electronic structure of neutral and alkali metal-doped poly [ 3-(4octylphenyl) thiophene] studied by photoelectron spectroscopy K.Z.
Surface and Interface Analysis, 2000
Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato... more Spectroscopic investigations on the electronic structure of thin films of various Zn-porphyrinato/Pt assemblies, consisting of a Zn-porphyrinato (ZnPf) macrocycle inserted between bis(phosphine)platinum(II) centres, were carried out by means of synchrotron radiation-induced near-edge x-ray absorption fine structure (NEXAFS) spectroscopy at the third-generation storage ring ELETTRA and at SuperACO. The spectra of the monomeric ZnPf and of the porphyrin-free base were also investigated for comparison. Modifications occur mainly at the N K-edge, when Zn metallation is carried out, arising from nitrogen deprotonation, and significant changes are also observed upon linkage between subunits.
Polymer, 1993
ABSTRACT The morphological evolution of as-grown poly(phenylacetylene) (PPA) free standing films ... more ABSTRACT The morphological evolution of as-grown poly(phenylacetylene) (PPA) free standing films has been studied. Investigations performed by scanning electron microscopy show that the freshly prepared PPA films exhibit a glass-like morphology which subsequently evolves into a microsphere structure. After ageing for 3 months at room temperature, PPA films reach a stable enamel-like phase. The chemical structure of the Rh(I) catalysts does not appear to influence the morphology of PPA. However, different catalysts yield different rates of morphological evolution.
Journal of Applied Polymer Science, 2011
ABSTRACT Biomimetic polymer nanofibers of poly(epsilon-caprolactone) and poly(L-lactide caprolact... more ABSTRACT Biomimetic polymer nanofibers of poly(epsilon-caprolactone) and poly(L-lactide caprolactone) copolymer were prepared by electrospinning. Modifications of the polymer nanofibers aimed at improving their biomimetic properties were performed by two different routes: (1) immobilization of an adhesion peptide, which mimicked the adhesion sequence of the extracellular matrix protein fibronectin, on the polymer surface and (2) incorporation of self-complementary oligopeptides, which showed alternated hydrophilic and hydrophobic side chain groups and was capable of generating extended ordered structures by self-assembling, into the polymer nanofibers. The structure of the polymer/peptide nanofibers was investigated by X-ray photoelectron and Fourier transform infrared spectroscopies. (C) 2011 Wiley Periodicals, Inc. j Appl Polym Sci 122: 3574-3582, 2011
Applied Surface Science, 1999
X-ray photoelectron spectroscopy was used in order to investigate the interface formation between... more X-ray photoelectron spectroscopy was used in order to investigate the interface formation between chromium and thin Ž. films of a newly synthesised p-conjugated polymer P PA-pNO PA ; the investigated material is a block copolymer 2 Ž. Ž. Äw Ž. Ž X. x consisting of phenylacetylene PA and para-nitro phenylacetylene pNO PA units-CH5C-R-CH5C-R-; 2 n mN X 4 R5C H , R 5C H NO. Chromium was evaporated stepwise in situ onto the polymer surface and the XPS spectra of the 6 5 6 4 2 substrate polymer and of the metal overlayer were studied as a function of increasing chromium thickness. In the early stages of the interface formation, chromium was found to interact mainly with the nitrogen atoms of the-NO groups, that are 2 reduced to nitride-like species; the NO bond is broken, as evidenced by the modifications occurring in the N1s and O1s spectra. The changes in the C1s spectra upon increasing metal deposition suggest the formation of a chromium-arene p-complex at low chromium coverage and of carbide-like species at higher chromium thickness.
A joint X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEX... more A joint X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS) investigation of the adsorption of phenylacetylene (PA, C 6 H 5 AC"CH) on the surface of Rh(1 0 0) single crystal was carried out by evaporating PA on the clean metal surface in the monolayer and multilayer regimes. The experimental results indicate that the interaction of the PA molecule with the Rh(1 0 0) surface involves mainly the two carbon atoms of the alkyne moiety; the binding of the alkyne group to the metal surface produces the opening of the triple bond. A comparison with the results obtained for PA adsorption on the surface of Pt (1 1 1) and Cu (1 0 0) is also discussed.
Polymers and Other Advanced Materials, 1995
Journal of peptide science : an official publication of the European Peptide Society, 2014
Hydrogels from self-assembling ionic complementary peptides have been receiving much interest fro... more Hydrogels from self-assembling ionic complementary peptides have been receiving much interest from the scientific community as mimetics of the extracellular matrix that can offer three-dimensional support for cell growth or become vehicles for the delivery of stem cells or drugs. These scaffolds have also been proposed as bone substitutes for small defects as they promote beneficial effects on human osteoblasts. In order to develop a novel bioactive titanium implant, we propose the introduction of a layer of ionic-complementary self-assembling peptides (EAbuK) on Ti whose surface has been previously sandblasted and acid etched. The peptide layer is anchored to the metal by covalent functionalization of titania with self-assembling sequences. The peptide layer has also been enriched by the insulin-like growth factor-1 incorporated to the layer and/or a conjugate obtained by chemoselective ligation between EAbuK and a sequence of 25 residues containing four GRGDSP motifs per chain. X-...
A new surface acoustic wave humidity sensor has been developed and tested. It is based on the use... more A new surface acoustic wave humidity sensor has been developed and tested. It is based on the use of a polyphenylacetylene (PPA) membrane which has already been utilized in the I,-doped form for the study of humidity sensors based on electrical conductivity responses. PPA shows physical properties which make it an almost ideal membrane for acoustic wave type sensors. Measurements performed on both Rayleigh and surface transverse waves have shown a high sensitivity of the device over a wide range of relative humidity values, a reversible behaviour together with a fairly fast response time.
Chemical Physics, 2001
C1s core level photoelectron studies have been performed in the gas phase for some conjugated org... more C1s core level photoelectron studies have been performed in the gas phase for some conjugated organic molecules, namely phenylacetylene, diethynylbiphenyl, diphenylbutadiyne and para-nitrophenylacetylene. The investigated systems consist of alkyne molecules with aromatic substituents and have been used as precursors for the synthesis of organic π-conjugated polymers. The experimental results were interpreted with the help of theoretical calculations: the ionization potentials
Synthetic Metals, 1996
The interaction of rubidium, a first group metal, with (α, ω-diphenyltetradecaheptaene) (DP7), a ... more The interaction of rubidium, a first group metal, with (α, ω-diphenyltetradecaheptaene) (DP7), a diphenylpolyene having seven double bonds in the polyene chain, has been studied by means of X-ray and UV photoelectron spectroscopy. DP7 can be considered as a model molecule for polyacetylene since the frontier π-orbitals are mainly localized on the polyene part of the molecule. The experimental data
Sensors and Actuators B-chemical, 1994
ABSTRACT A device for surface acoustic wave (SAW) measurements, based on a polymeric sensitive me... more ABSTRACT A device for surface acoustic wave (SAW) measurements, based on a polymeric sensitive membrane, that is polyethynylfluorenol (PEFl), has been realized. The SAW/PEFl sensor shows relatively fast and highly sensitive responses in the range of relative humidity 0–60%. The enhanced sensitivity of the SAW/PEFl device, in comparison with that of a SAW sensor which utilized a polyphenylacetylene film, may be attributed to the presence of OH groups belonging to the polymer repeat unit.