(DE) Die Erfindung betrifft ein Verfahren zur Herstellung einer Metallnanopartikeldispersion, ins... more (DE) Die Erfindung betrifft ein Verfahren zur Herstellung einer Metallnanopartikeldispersion, insbesondere einer Silbernanopartikeldispersion, bei dem nach der Herstellungnanoskaliger Metallpartikel, stabilisiert mit wenigstens einem Dispergierhilfsmittel enthaltend wenigstens eine freie Carbonsäuregruppe oder deren Salz als funktionelle Gruppe, in wenigstens einem flüssigen Dispersionsmittel (Lösungsmittel), gezielt eine Ausflockung der Metallnanopartikel herbeigeführt wird, die gebildete Metallnanopartikel-Ausflockung in wenigstens einem flüssigen Dispersionsmittel, gegebenenfalls mittels Zugabe einer Base, redispergiert und die Metallnanopartikeldispersion auf eine gewünschte Metallnanopartikel-Konzentration eingestellt wird. Gegenstand der Erfindung ist weiterhin eine Metallnanopartikeldispersion, insbesondere Silbernanopartikeldispersion, insbesondere hergestellt mit dem erfindungsgemäßen Verfahren, und deren Verwendung. ------------- (EN) The invention relates to a method for ...
A cross-linking moiety having a structure represented by formula (I) or (II): N3-ArF-W (I) (N3-Ar... more A cross-linking moiety having a structure represented by formula (I) or (II): N3-ArF-W (I) (N3-ArF-W)n-L (II) wherein ArF comprises a fluorinated phenyl group having at least one non-fluorine substituent (R) that is bulkier than fluorine and which is located at the meta position relative to the N3 group; W comprises an electron-withdrawing group; and L comprises a linker group. The cross-linking moiety is particularly useful in the manufacture of polymer semiconductor layers and photovoltaic devices
Metal nanoparticles having a protective sub-monolayer of ligand molecules, the sub-monolayer comp... more Metal nanoparticles having a protective sub-monolayer of ligand molecules, the sub-monolayer comprising at least one non-labile ligand with ionisable terminal end group, and at least one labile ligand, characterised in that the metal nanoparticles have a dispersability in polar solvents of more than 50 mg/mL and a coalescence temperature less than 200 deg C measured at a heating rate of 1 deg C/min.
Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in pol... more Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in polymer matrix thin films as a function of heat treatment. [Applied Physics Letters 94, 091909 (2009)]. Sankaran Sivaramakrishnan, Bibin T. Anto, Peter K.-H. Ho. Abstract. ...
In order to use the metal nanoparticle (NP) films in the plastic electronics applications, it has... more In order to use the metal nanoparticle (NP) films in the plastic electronics applications, it has to be annealed to eliminate the protective monolayer ligand shell or displace the polymeric dispersant to effect coalescence to a nanocrystalline “bulk-like” continuous film. We here demonstrate a new concept of sparse monolayer protection by ω-ionic functionalised alkylthiol ligands that can offer both high water and alcohol solubility; and at the same time low coalescence temperature (Tp ≈ 145 °C). This allows, for example, Au NP films to be coalesced to continuous metallic films with conductivity near half the value of bulk gold conductivity after only brief annealing (few min) at this temperature, far shorter than that required for commercial Ag NP systems. This method is, therefore, compatible with commercially available plastic substrates that are sensitive to temperature and organic solvents. Detailed study by Fourier transform infrared spectroscopy reveals that the coalescence o...
Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible el... more Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible electronics applications are promising, as the counterparts such as poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonicacid) (PEDT:PSS) and indium-tin-oxide (ITO) films fails to fulfill some of the requirements. ITO is brittle and PEDT:PSS films are not stable and colour neutral. Here we have demonstrated reproducible TCFs from highly stable dispersions of SWNTs treated with different acid treatments. The transparent conducting films prepared from these dispersions are flexible and d.c.-to-o.c. ratio of these films are over 5, which is at par with various reports on SWNT films. We have also demonstrated that the optical and electrical properties of TCFs can be improved by templating a suitable mixture of polymeric stabilizers. TCFs prepared from mixture-of-PSSNa:PVP stabilized SWNT dispersions have better optical and electrical properties (e.g. Rs=200Ω/□; T=70%) than TCFs prepared fr...
Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible el... more Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible electronics applications are promising, as the counterparts such as poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonicacid) (PEDT:PSS) and indium-tin-oxide (ITO) films fails to fulfill the requirements. ITO is brittle and PEDT:PSS films are not stable and colour neutral. Here we have demonstrated reproducible TCFs from highly stable dispersions of SWNTs treated with different acid treatments. The transparent conducting films prepared from these dispersions are flexible and d.c.-to-o.c. ratio of these films are over 5, which is at par with various reports on SWNT films. We have also demonstrated that TCFs prepared from basic SWNT dispersions are better by factor of (Sigma)d.c.-to-(Sigma)o.c ≈ 1, as the (Sigma)d.c.-to-(Sigma)o.c increases with increasing pH of dispersions. SWNTs are functionalized with different moieties such as –COOH, OH, etc. At basic pH (>7), these carboxyl grou...
Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible el... more Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible electronics applications are promising, as the counterparts such as poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonicacid) (PEDT:PSS) and indium-tin-oxide (ITO) films fails to fulfill some of the requirements. ITO is brittle and PEDT:PSS films are not stable and colour neutral. However, the colour neutrality of and flexibility of SWNTs makes this material as potential candidate for TCFs in plastic electronic applications. Here we have demonstrated reproducible TCFs fabricated from highly stable dispersions of SWNTs that underwent different acid treatment conditions. TCFs prepared from these dispersions have _(d.c.)/_(o.c.) [1] as high as 6, which is by far the best value achieved on “pre-treated SWNTs”. Higher _(d.c.)/_(o.c.) has been reported only for SWNT films with “post treatments”.[2] We also have demonstrated that TCFs prepared from basic SWNT dispersions can be enhanced by...
ABSTRACT A layered composite coating material with favorable properties for application as a tran... more ABSTRACT A layered composite coating material with favorable properties for application as a transparent conductor is presented. It is composed of layers of three nanoscopic materials, namely zinc oxide nanoparticles, single wall nanotubes, and graphene oxide nanosheets. The electrically conducting layer consists of single wall nanotubes (SWNTs). The layer of zinc oxide nanoparticles acts as a primer. It increases the adhesion and the stability of the films against mechanical stresses. The top layer of graphene oxide enhances the conductivity of such coatings. Such three-layer composite coatings show better conductivity (without compromising transparency) and improved mechanical stability compared to pure SWNT films. The processes used in the preparation of such coatings are easily scalable.
Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in pol... more Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in polymer matrix thin films as a function of heat treatment. [Applied Physics Letters 94, 091909 (2009)]. Sankaran Sivaramakrishnan, Bibin T. Anto, Peter K.-H. Ho. Abstract. ...
Method for producing metal nanoparticle dispersion, and their use
The invention relates to a met... more Method for producing metal nanoparticle dispersion, and their use
The invention relates to a method for producing a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, wherein after the production of nanoscale metal particles, stabilized by means of at least one auxiliary dispersing agent containing at least one free carboxylic acid group or salt therof as a functional group, in at least one liquid dispersant (solvent). flocculation of the metal nanoparticles is deliberately caused, the formed metal nanoparticle flocculation is dispersed again in at least one liquid dispersant, optionally by adding a base, and the metal nanoparticle dispersion is set to desired metal nanoparticle concentration. The invention further relates to a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, in particular produced by means of the method according to the invention, and to the use of said metal nanoparticle dispersion
A cross-linking moiety having a structure represented by formula (I) or (II):
N3-ArF-W (I)
(... more A cross-linking moiety having a structure represented by formula (I) or (II):
N3-ArF-W (I)
(N3-ArF-W)n-L (II)
wherein ArF comprises a fluorinated phenyl group having at least one non-fluorine substituent (R) that is bulkier than fluorine and which is located at the meta position relative to the N3 group; W comprises an electron-withdrawing group; and L comprises a linker group. The cross-linking moiety is particularly useful in the manufacture of polymer semiconductor layers and photovoltaic devices
(DE) Die Erfindung betrifft ein Verfahren zur Herstellung einer Metallnanopartikeldispersion, ins... more (DE) Die Erfindung betrifft ein Verfahren zur Herstellung einer Metallnanopartikeldispersion, insbesondere einer Silbernanopartikeldispersion, bei dem nach der Herstellungnanoskaliger Metallpartikel, stabilisiert mit wenigstens einem Dispergierhilfsmittel enthaltend wenigstens eine freie Carbonsäuregruppe oder deren Salz als funktionelle Gruppe, in wenigstens einem flüssigen Dispersionsmittel (Lösungsmittel), gezielt eine Ausflockung der Metallnanopartikel herbeigeführt wird, die gebildete Metallnanopartikel-Ausflockung in wenigstens einem flüssigen Dispersionsmittel, gegebenenfalls mittels Zugabe einer Base, redispergiert und die Metallnanopartikeldispersion auf eine gewünschte Metallnanopartikel-Konzentration eingestellt wird. Gegenstand der Erfindung ist weiterhin eine Metallnanopartikeldispersion, insbesondere Silbernanopartikeldispersion, insbesondere hergestellt mit dem erfindungsgemäßen Verfahren, und deren Verwendung. ------------- (EN) The invention relates to a method for ...
A cross-linking moiety having a structure represented by formula (I) or (II): N3-ArF-W (I) (N3-Ar... more A cross-linking moiety having a structure represented by formula (I) or (II): N3-ArF-W (I) (N3-ArF-W)n-L (II) wherein ArF comprises a fluorinated phenyl group having at least one non-fluorine substituent (R) that is bulkier than fluorine and which is located at the meta position relative to the N3 group; W comprises an electron-withdrawing group; and L comprises a linker group. The cross-linking moiety is particularly useful in the manufacture of polymer semiconductor layers and photovoltaic devices
Metal nanoparticles having a protective sub-monolayer of ligand molecules, the sub-monolayer comp... more Metal nanoparticles having a protective sub-monolayer of ligand molecules, the sub-monolayer comprising at least one non-labile ligand with ionisable terminal end group, and at least one labile ligand, characterised in that the metal nanoparticles have a dispersability in polar solvents of more than 50 mg/mL and a coalescence temperature less than 200 deg C measured at a heating rate of 1 deg C/min.
Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in pol... more Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in polymer matrix thin films as a function of heat treatment. [Applied Physics Letters 94, 091909 (2009)]. Sankaran Sivaramakrishnan, Bibin T. Anto, Peter K.-H. Ho. Abstract. ...
In order to use the metal nanoparticle (NP) films in the plastic electronics applications, it has... more In order to use the metal nanoparticle (NP) films in the plastic electronics applications, it has to be annealed to eliminate the protective monolayer ligand shell or displace the polymeric dispersant to effect coalescence to a nanocrystalline “bulk-like” continuous film. We here demonstrate a new concept of sparse monolayer protection by ω-ionic functionalised alkylthiol ligands that can offer both high water and alcohol solubility; and at the same time low coalescence temperature (Tp ≈ 145 °C). This allows, for example, Au NP films to be coalesced to continuous metallic films with conductivity near half the value of bulk gold conductivity after only brief annealing (few min) at this temperature, far shorter than that required for commercial Ag NP systems. This method is, therefore, compatible with commercially available plastic substrates that are sensitive to temperature and organic solvents. Detailed study by Fourier transform infrared spectroscopy reveals that the coalescence o...
Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible el... more Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible electronics applications are promising, as the counterparts such as poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonicacid) (PEDT:PSS) and indium-tin-oxide (ITO) films fails to fulfill some of the requirements. ITO is brittle and PEDT:PSS films are not stable and colour neutral. Here we have demonstrated reproducible TCFs from highly stable dispersions of SWNTs treated with different acid treatments. The transparent conducting films prepared from these dispersions are flexible and d.c.-to-o.c. ratio of these films are over 5, which is at par with various reports on SWNT films. We have also demonstrated that the optical and electrical properties of TCFs can be improved by templating a suitable mixture of polymeric stabilizers. TCFs prepared from mixture-of-PSSNa:PVP stabilized SWNT dispersions have better optical and electrical properties (e.g. Rs=200Ω/□; T=70%) than TCFs prepared fr...
Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible el... more Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible electronics applications are promising, as the counterparts such as poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonicacid) (PEDT:PSS) and indium-tin-oxide (ITO) films fails to fulfill the requirements. ITO is brittle and PEDT:PSS films are not stable and colour neutral. Here we have demonstrated reproducible TCFs from highly stable dispersions of SWNTs treated with different acid treatments. The transparent conducting films prepared from these dispersions are flexible and d.c.-to-o.c. ratio of these films are over 5, which is at par with various reports on SWNT films. We have also demonstrated that TCFs prepared from basic SWNT dispersions are better by factor of (Sigma)d.c.-to-(Sigma)o.c ≈ 1, as the (Sigma)d.c.-to-(Sigma)o.c increases with increasing pH of dispersions. SWNTs are functionalized with different moieties such as –COOH, OH, etc. At basic pH (>7), these carboxyl grou...
Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible el... more Transparent conducting films (TCFs) based on single wall carbon nanotubes (SWNTs) for flexible electronics applications are promising, as the counterparts such as poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonicacid) (PEDT:PSS) and indium-tin-oxide (ITO) films fails to fulfill some of the requirements. ITO is brittle and PEDT:PSS films are not stable and colour neutral. However, the colour neutrality of and flexibility of SWNTs makes this material as potential candidate for TCFs in plastic electronic applications. Here we have demonstrated reproducible TCFs fabricated from highly stable dispersions of SWNTs that underwent different acid treatment conditions. TCFs prepared from these dispersions have _(d.c.)/_(o.c.) [1] as high as 6, which is by far the best value achieved on “pre-treated SWNTs”. Higher _(d.c.)/_(o.c.) has been reported only for SWNT films with “post treatments”.[2] We also have demonstrated that TCFs prepared from basic SWNT dispersions can be enhanced by...
ABSTRACT A layered composite coating material with favorable properties for application as a tran... more ABSTRACT A layered composite coating material with favorable properties for application as a transparent conductor is presented. It is composed of layers of three nanoscopic materials, namely zinc oxide nanoparticles, single wall nanotubes, and graphene oxide nanosheets. The electrically conducting layer consists of single wall nanotubes (SWNTs). The layer of zinc oxide nanoparticles acts as a primer. It increases the adhesion and the stability of the films against mechanical stresses. The top layer of graphene oxide enhances the conductivity of such coatings. Such three-layer composite coatings show better conductivity (without compromising transparency) and improved mechanical stability compared to pure SWNT films. The processes used in the preparation of such coatings are easily scalable.
Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in pol... more Optical modeling of the plasmon band of monolayer-protected nanometal clusters in pure and in polymer matrix thin films as a function of heat treatment. [Applied Physics Letters 94, 091909 (2009)]. Sankaran Sivaramakrishnan, Bibin T. Anto, Peter K.-H. Ho. Abstract. ...
Method for producing metal nanoparticle dispersion, and their use
The invention relates to a met... more Method for producing metal nanoparticle dispersion, and their use
The invention relates to a method for producing a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, wherein after the production of nanoscale metal particles, stabilized by means of at least one auxiliary dispersing agent containing at least one free carboxylic acid group or salt therof as a functional group, in at least one liquid dispersant (solvent). flocculation of the metal nanoparticles is deliberately caused, the formed metal nanoparticle flocculation is dispersed again in at least one liquid dispersant, optionally by adding a base, and the metal nanoparticle dispersion is set to desired metal nanoparticle concentration. The invention further relates to a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, in particular produced by means of the method according to the invention, and to the use of said metal nanoparticle dispersion
A cross-linking moiety having a structure represented by formula (I) or (II):
N3-ArF-W (I)
(... more A cross-linking moiety having a structure represented by formula (I) or (II):
N3-ArF-W (I)
(N3-ArF-W)n-L (II)
wherein ArF comprises a fluorinated phenyl group having at least one non-fluorine substituent (R) that is bulkier than fluorine and which is located at the meta position relative to the N3 group; W comprises an electron-withdrawing group; and L comprises a linker group. The cross-linking moiety is particularly useful in the manufacture of polymer semiconductor layers and photovoltaic devices
Metal nanoparticles having a protective sub-monolayer of ligand molecules, the sub-monolayer comp... more Metal nanoparticles having a protective sub-monolayer of ligand molecules, the sub-monolayer comprising at least one non-labile ligand with ionisable terminal end group, and at least one labile ligand, characterised in that the metal nanoparticles have a dispersability in polar solvents of more than 50 mg/mL and a coalescence temperature less than 200 deg C measured at a heating rate of 1 deg C/min.
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Papers by Bibin Anto
Patents by Bibin Anto
The invention relates to a method for producing a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, wherein after the production of nanoscale metal particles, stabilized by means of at least one auxiliary dispersing agent containing at least one free carboxylic acid group or salt therof as a functional group, in at least one liquid dispersant (solvent). flocculation of the metal nanoparticles is deliberately caused, the formed metal nanoparticle flocculation is dispersed again in at least one liquid dispersant, optionally by adding a base, and the metal nanoparticle dispersion is set to desired metal nanoparticle concentration. The invention further relates to a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, in particular produced by means of the method according to the invention, and to the use of said metal nanoparticle dispersion
N3-ArF-W (I)
(N3-ArF-W)n-L (II)
wherein ArF comprises a fluorinated phenyl group having at least one non-fluorine substituent (R) that is bulkier than fluorine and which is located at the meta position relative to the N3 group; W comprises an electron-withdrawing group; and L comprises a linker group. The cross-linking moiety is particularly useful in the manufacture of polymer semiconductor layers and photovoltaic devices
The invention relates to a method for producing a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, wherein after the production of nanoscale metal particles, stabilized by means of at least one auxiliary dispersing agent containing at least one free carboxylic acid group or salt therof as a functional group, in at least one liquid dispersant (solvent). flocculation of the metal nanoparticles is deliberately caused, the formed metal nanoparticle flocculation is dispersed again in at least one liquid dispersant, optionally by adding a base, and the metal nanoparticle dispersion is set to desired metal nanoparticle concentration. The invention further relates to a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, in particular produced by means of the method according to the invention, and to the use of said metal nanoparticle dispersion
N3-ArF-W (I)
(N3-ArF-W)n-L (II)
wherein ArF comprises a fluorinated phenyl group having at least one non-fluorine substituent (R) that is bulkier than fluorine and which is located at the meta position relative to the N3 group; W comprises an electron-withdrawing group; and L comprises a linker group. The cross-linking moiety is particularly useful in the manufacture of polymer semiconductor layers and photovoltaic devices