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Papers by Raushan Koizhaiganova
Physica Status Solidi B-basic Solid State Physics, Oct 30, 2012
We demonstrated a simple transfer method enables to fabricate the single-walled carbon nanotube (... more We demonstrated a simple transfer method enables to fabricate the single-walled carbon nanotube (SWCNT) film on the plastic substrate. SWCNT network was separated from the initial substrate and transferred onto another substrate using the nitric acid. We also found that electrical conductivity of transferred film was improved. The sheet resistance of SWCNT films was changed from a 150~300 ¿/sq to a 80~150 ¿/sq after transferring the SWCNT film in the range of 70~80% transmittance. This is contributed to the densification of the SWCNT network. During the transfer process, the nitric acid fills the voids between the tubes and form homogeneous interfaces among the tubes, liquid and air. Pressure differences at the interface exert bending moments to the tubes and induce deformation. By the way, deformation leads to reduce the distance between the tubes and it is stuck together due to the van der Waals forces. We suggest that this transfer method provides electrically improved SWCNT films as well as easy, contrallable and inexpensive way to fabricate. This work can open up new possibility for the flexible electronics.
Polymer Bulletin, Dec 23, 2004
Journal of Applied Polymer Science, 2004
ABSTRACT A novel hydrophobic monomer was synthesized from the acetoacetic ester and dodecylamine ... more ABSTRACT A novel hydrophobic monomer was synthesized from the acetoacetic ester and dodecylamine by condensation reaction in mild conditions. The modification by the dodecyl groups monomer was involved in the Michael addition reaction with acrylic (or methacrylic) acid followed by radical polymerization. Both linear and crosslinked novel betaine-type polyampholytes bearing hydrophobic “tail” and hydrophilic “head” were obtained. The linear polymer was characterized by viscometry, FTIR, and Raman spectroscopy. Swelling–shrinking behavior of linear and crosslinked samples was studied in water–DMF and water–DMSO mixtures. The applicability of hydrophobically modified polybetaines as pour point depressants (fluidity improvers) was also demonstrated. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1042–1048, 2004
International Journal of Food Properties
Journal of Applied Polymer Science, 2008
Well-defined triblock copolymer poly(ethylene oxide)-b-poly(2-(diethylamino)ethyl methacrylate)-b... more Well-defined triblock copolymer poly(ethylene oxide)-b-poly(2-(diethylamino)ethyl methacrylate)-b-poly (N-isopropyl-acrylamide) (PEO-b-PDMAEMA-b-PNIPAAm) was synthesized via sequential reversible additionfragmentation chain transfer polymerization (RAFT) of 2-(dimethylamino)ethyl methacrylate (DMAEMA) and Nisopropylacrylamide (NIPAAm) using a-methoxy-x-S-1dodecyl-S-a-(a,a 0-dimethyl-a 00-acetate) poly(ethylene oxide) (mPEO-DDAT) as macro-RAFT agent, AIBN as initiator in dioxane at 808C. The polymerization data indicated that the both RAFT processes were well controlled. The molecular weights of macro-RAFT agents showed the influence on the RAFT polymerization process. The final PEO-b-PDMAEMA-b-PNIPAAm triblock copolymer can form uniform micelles in aqueous media above the lower critical solution temperature (LCST) due to containing temperature-sensitive PNIPAAm block. The micelle size and D h were dependent on the composition of triblock copolymer and the pH value of the solution. The PEO-b-PDMAEMAb-PNIPAAm triblock copolymer showed dual temperatureand pH-sensitive property in aqueous media.
Synthetic Metals, 2009
In the present study, we report experiments based on in situ polymerization of 3-octylthiophene w... more In the present study, we report experiments based on in situ polymerization of 3-octylthiophene with DWCNT and many hitherto unstudied properties for the first time. The specialty of DWCNT being the inner tube retaining its intrinsic electronic and optical properties, while the outer tube could be involved in the composite formation. From the IR aromatic and out-of-plane C-H stretching frequencies, the interaction between the polymer and the nanotubes is probed. Further to this absorption spectroscopy, photoluminescence and Raman measurements were carried out to characterize the composites. The conductivity contributions of the nanotubes and Hall voltage measurements are used to understand the utility of the composites for solar cell applications.
Polymers for Advanced Technologies, 2009
The transport properties of conducting polymers are known to be greatly influenced by the chemica... more The transport properties of conducting polymers are known to be greatly influenced by the chemical unsaturation surrounding the polymer backbone, besides favorable conformation of the side chains present. Polymeric composites with multi-walled carbon nanotubes (MWNT) can provide a good conductive path at relatively low carbon contents, as these have high aspect ratio, specific surfaces and are cost effective. Hence their use in various applications such as organic LED, solar cells and supercapacitors are very much anticipated. In this respect poly(3-octylthiophene)/MWNT composites have been prepared by an ''in situ'' polymerization process in chloroform medium with FeCl 3 oxidant at room temperature. The composites were characterized by Fourier Transfer Infrared spectroscopy (FT-IR), Raman, work function and X-ray diffraction (XRD) measurements. The results indicate only a weak p-p interaction between the moieties, in the absence of a strong covalent bonding. The ultraviolet-visible (UV-Vis) measurements also support this view. The photoluminescence (PL) quenching indicates the effectiveness of the interface in the formation of the donor-acceptor type composite. The conductivity of the composites is followed by a four probe technique to understand the conduction mechanism. The Hall voltage measurement is followed to monitor carrier concentrations and mobilities. The impressive conductivity and mobility values encourage the utility of the composites as photovoltaic material.
Polymer International, 2003
... Research Article. Stimuli-sensitive behaviour of novel betaine-type polyampholytes. Alexander... more ... Research Article. Stimuli-sensitive behaviour of novel betaine-type polyampholytes. Alexander G Didukh,; Raushan B Koizhaiganova,; Gulzhan Khamitzhanova,; Larisa A Bimendina,; Sarkyt E Kudaibergenov. ... Nisato G, Munch JP and Candau SJ, Langmuir 15: 42364244 (1999) ...
Macromolecular Rapid Communications, 2002
Journal of Applied Polymer Science, 2010
... Synthesis and characterization of poly(3-octylthiophene)/single wall carbon nanotube composit... more ... Synthesis and characterization of poly(3-octylthiophene)/single wall carbon nanotube composites for photovoltaic applications. Hee Jin Kim 1 ,; Raushan B. Koizhaiganova 1 ,; Mohammad Rezaul Karim 2,* ,; Gang Ho Lee 1 ,; Thiagarajan Vasudevan 1 ,; Mu Sang Lee 1,*. ...
Journal of Applied Polymer Science, 2010
Poly(3-alkylthiophene)s represent a family of conjugated polymers that are soluble and processabl... more Poly(3-alkylthiophene)s represent a family of conjugated polymers that are soluble and processable, but still retaining the good electrical conductivity of the insoluble parent polymer thiophene ring backbone. Poly(3hexylthiophene) (P3HT) is reported to be a best candidate in the family for solar cell applications. In situ polymerization of 3-hexylthiophene monomer with double-walled carbon nanotubes (DWCNTs) has been attempted with the aim of addressing two main issues, namely, the interfacial bonding and proper dispersion of the carbon nanotubes in the polymer matrix to get a high-performing polymer/ nanocomposite. Fourier transform infrared spectroscopy, Raman, and X-ray diffraction studies indicate the physical wrapping of the polymer on the nanotubes in the absence of any ground-state interaction between them. The ultraviolet-visible measurements also support this view. The photoluminescence quenching indicates the effectiveness of the interface in the formation of the donor-acceptor-type composite. The impressive conductivity values encourage the utility of the composites as photovoltaic material. V
International Journal of Polymeric Materials, 2008
Polymer multi-wall carbon nanotube (MWNT) composites were prepared and characterized as part of a... more Polymer multi-wall carbon nanotube (MWNT) composites were prepared and characterized as part of an effort to develop polymeric materials with improved combinations of properties for potential use in solar cell applications. Multi-walled carbon nanotube (MWNT) poly(3-hexylthiophene) nanocomposites were synthesized by in situ polymerization of monomers in the presence of different amounts of MWNTs. A process is reported to efficiently disperse multi-walled carbon nanotube (MWNT) bundles in a semiconducting polymer matrix. A uniform dispersion of the nanotubes in the polymer matrix was obtained. Characterization of the nanocomposites and the effects of MWNT concentration and dispersion on the structural, optical and electrical properties were discussed. FTIR and Raman spectroscopic investigations of nanocomposites indicate that the polymer is wrapped on the nanotubes, taking up a rigid orientation through π-π stacking. The Hall voltage measurement is followed to monitor carrier concentrations and mobilities, instead of the device fabrication and hole mobility measurements.
physica status solidi (b), 2010
We investigated the chemical doping of the single-walled carbon nanotubes (SWCNTs) networks by a ... more We investigated the chemical doping of the single-walled carbon nanotubes (SWCNTs) networks by a treatment with aromatic amines. Adsorption and intercalation of amine molecules in bundled SWCNTs leads to typical n-type doping observed already for alkali metals. The electron donation to SWCNTs is demonstrated by the X-ray-induced photoelectron spectra (XPS), where the carbon C 1s peak observed at 284.4 eV for the sp 2 carbon in pristine samples is shifted by up to 0.3 eV to higher binding energy upon chemical treatment. The development of a Breit-Wigner-Fano component on the lower energy side of the G À mode in the Raman spectrum as well as a shift of the G þ to lower frequency provide evidence for charge accumulation in the nanotube p system, and indication for the n-type doping. The spectroscopic changes are accompanied by the modification of the electrical properties of the SWCNTs. A reduction of conductivity depends on the doping level and implies the decreasing concentration of the charge carriers in the naturally p-doped tubes. Comparing the two selected n-type dopants, the tetramethyl-p-phenylenediamine, shows more pronounced changes in the XPS and the Raman spectra than tetramethylpyrazine, indicating that the sp 3 hybridization of nitrogen in the amine groups attached to phenyl ring is much more effective in interaction with the tube p system than the sp 2 hybridization of nitrogen in the aromatic pyrazine ring.
Physica Status Solidi B-basic Solid State Physics, Oct 30, 2012
We demonstrated a simple transfer method enables to fabricate the single-walled carbon nanotube (... more We demonstrated a simple transfer method enables to fabricate the single-walled carbon nanotube (SWCNT) film on the plastic substrate. SWCNT network was separated from the initial substrate and transferred onto another substrate using the nitric acid. We also found that electrical conductivity of transferred film was improved. The sheet resistance of SWCNT films was changed from a 150~300 ¿/sq to a 80~150 ¿/sq after transferring the SWCNT film in the range of 70~80% transmittance. This is contributed to the densification of the SWCNT network. During the transfer process, the nitric acid fills the voids between the tubes and form homogeneous interfaces among the tubes, liquid and air. Pressure differences at the interface exert bending moments to the tubes and induce deformation. By the way, deformation leads to reduce the distance between the tubes and it is stuck together due to the van der Waals forces. We suggest that this transfer method provides electrically improved SWCNT films as well as easy, contrallable and inexpensive way to fabricate. This work can open up new possibility for the flexible electronics.
Polymer Bulletin, Dec 23, 2004
Journal of Applied Polymer Science, 2004
ABSTRACT A novel hydrophobic monomer was synthesized from the acetoacetic ester and dodecylamine ... more ABSTRACT A novel hydrophobic monomer was synthesized from the acetoacetic ester and dodecylamine by condensation reaction in mild conditions. The modification by the dodecyl groups monomer was involved in the Michael addition reaction with acrylic (or methacrylic) acid followed by radical polymerization. Both linear and crosslinked novel betaine-type polyampholytes bearing hydrophobic “tail” and hydrophilic “head” were obtained. The linear polymer was characterized by viscometry, FTIR, and Raman spectroscopy. Swelling–shrinking behavior of linear and crosslinked samples was studied in water–DMF and water–DMSO mixtures. The applicability of hydrophobically modified polybetaines as pour point depressants (fluidity improvers) was also demonstrated. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1042–1048, 2004
International Journal of Food Properties
Journal of Applied Polymer Science, 2008
Well-defined triblock copolymer poly(ethylene oxide)-b-poly(2-(diethylamino)ethyl methacrylate)-b... more Well-defined triblock copolymer poly(ethylene oxide)-b-poly(2-(diethylamino)ethyl methacrylate)-b-poly (N-isopropyl-acrylamide) (PEO-b-PDMAEMA-b-PNIPAAm) was synthesized via sequential reversible additionfragmentation chain transfer polymerization (RAFT) of 2-(dimethylamino)ethyl methacrylate (DMAEMA) and Nisopropylacrylamide (NIPAAm) using a-methoxy-x-S-1dodecyl-S-a-(a,a 0-dimethyl-a 00-acetate) poly(ethylene oxide) (mPEO-DDAT) as macro-RAFT agent, AIBN as initiator in dioxane at 808C. The polymerization data indicated that the both RAFT processes were well controlled. The molecular weights of macro-RAFT agents showed the influence on the RAFT polymerization process. The final PEO-b-PDMAEMA-b-PNIPAAm triblock copolymer can form uniform micelles in aqueous media above the lower critical solution temperature (LCST) due to containing temperature-sensitive PNIPAAm block. The micelle size and D h were dependent on the composition of triblock copolymer and the pH value of the solution. The PEO-b-PDMAEMAb-PNIPAAm triblock copolymer showed dual temperatureand pH-sensitive property in aqueous media.
Synthetic Metals, 2009
In the present study, we report experiments based on in situ polymerization of 3-octylthiophene w... more In the present study, we report experiments based on in situ polymerization of 3-octylthiophene with DWCNT and many hitherto unstudied properties for the first time. The specialty of DWCNT being the inner tube retaining its intrinsic electronic and optical properties, while the outer tube could be involved in the composite formation. From the IR aromatic and out-of-plane C-H stretching frequencies, the interaction between the polymer and the nanotubes is probed. Further to this absorption spectroscopy, photoluminescence and Raman measurements were carried out to characterize the composites. The conductivity contributions of the nanotubes and Hall voltage measurements are used to understand the utility of the composites for solar cell applications.
Polymers for Advanced Technologies, 2009
The transport properties of conducting polymers are known to be greatly influenced by the chemica... more The transport properties of conducting polymers are known to be greatly influenced by the chemical unsaturation surrounding the polymer backbone, besides favorable conformation of the side chains present. Polymeric composites with multi-walled carbon nanotubes (MWNT) can provide a good conductive path at relatively low carbon contents, as these have high aspect ratio, specific surfaces and are cost effective. Hence their use in various applications such as organic LED, solar cells and supercapacitors are very much anticipated. In this respect poly(3-octylthiophene)/MWNT composites have been prepared by an ''in situ'' polymerization process in chloroform medium with FeCl 3 oxidant at room temperature. The composites were characterized by Fourier Transfer Infrared spectroscopy (FT-IR), Raman, work function and X-ray diffraction (XRD) measurements. The results indicate only a weak p-p interaction between the moieties, in the absence of a strong covalent bonding. The ultraviolet-visible (UV-Vis) measurements also support this view. The photoluminescence (PL) quenching indicates the effectiveness of the interface in the formation of the donor-acceptor type composite. The conductivity of the composites is followed by a four probe technique to understand the conduction mechanism. The Hall voltage measurement is followed to monitor carrier concentrations and mobilities. The impressive conductivity and mobility values encourage the utility of the composites as photovoltaic material.
Polymer International, 2003
... Research Article. Stimuli-sensitive behaviour of novel betaine-type polyampholytes. Alexander... more ... Research Article. Stimuli-sensitive behaviour of novel betaine-type polyampholytes. Alexander G Didukh,; Raushan B Koizhaiganova,; Gulzhan Khamitzhanova,; Larisa A Bimendina,; Sarkyt E Kudaibergenov. ... Nisato G, Munch JP and Candau SJ, Langmuir 15: 42364244 (1999) ...
Macromolecular Rapid Communications, 2002
Journal of Applied Polymer Science, 2010
... Synthesis and characterization of poly(3-octylthiophene)/single wall carbon nanotube composit... more ... Synthesis and characterization of poly(3-octylthiophene)/single wall carbon nanotube composites for photovoltaic applications. Hee Jin Kim 1 ,; Raushan B. Koizhaiganova 1 ,; Mohammad Rezaul Karim 2,* ,; Gang Ho Lee 1 ,; Thiagarajan Vasudevan 1 ,; Mu Sang Lee 1,*. ...
Journal of Applied Polymer Science, 2010
Poly(3-alkylthiophene)s represent a family of conjugated polymers that are soluble and processabl... more Poly(3-alkylthiophene)s represent a family of conjugated polymers that are soluble and processable, but still retaining the good electrical conductivity of the insoluble parent polymer thiophene ring backbone. Poly(3hexylthiophene) (P3HT) is reported to be a best candidate in the family for solar cell applications. In situ polymerization of 3-hexylthiophene monomer with double-walled carbon nanotubes (DWCNTs) has been attempted with the aim of addressing two main issues, namely, the interfacial bonding and proper dispersion of the carbon nanotubes in the polymer matrix to get a high-performing polymer/ nanocomposite. Fourier transform infrared spectroscopy, Raman, and X-ray diffraction studies indicate the physical wrapping of the polymer on the nanotubes in the absence of any ground-state interaction between them. The ultraviolet-visible measurements also support this view. The photoluminescence quenching indicates the effectiveness of the interface in the formation of the donor-acceptor-type composite. The impressive conductivity values encourage the utility of the composites as photovoltaic material. V
International Journal of Polymeric Materials, 2008
Polymer multi-wall carbon nanotube (MWNT) composites were prepared and characterized as part of a... more Polymer multi-wall carbon nanotube (MWNT) composites were prepared and characterized as part of an effort to develop polymeric materials with improved combinations of properties for potential use in solar cell applications. Multi-walled carbon nanotube (MWNT) poly(3-hexylthiophene) nanocomposites were synthesized by in situ polymerization of monomers in the presence of different amounts of MWNTs. A process is reported to efficiently disperse multi-walled carbon nanotube (MWNT) bundles in a semiconducting polymer matrix. A uniform dispersion of the nanotubes in the polymer matrix was obtained. Characterization of the nanocomposites and the effects of MWNT concentration and dispersion on the structural, optical and electrical properties were discussed. FTIR and Raman spectroscopic investigations of nanocomposites indicate that the polymer is wrapped on the nanotubes, taking up a rigid orientation through π-π stacking. The Hall voltage measurement is followed to monitor carrier concentrations and mobilities, instead of the device fabrication and hole mobility measurements.
physica status solidi (b), 2010
We investigated the chemical doping of the single-walled carbon nanotubes (SWCNTs) networks by a ... more We investigated the chemical doping of the single-walled carbon nanotubes (SWCNTs) networks by a treatment with aromatic amines. Adsorption and intercalation of amine molecules in bundled SWCNTs leads to typical n-type doping observed already for alkali metals. The electron donation to SWCNTs is demonstrated by the X-ray-induced photoelectron spectra (XPS), where the carbon C 1s peak observed at 284.4 eV for the sp 2 carbon in pristine samples is shifted by up to 0.3 eV to higher binding energy upon chemical treatment. The development of a Breit-Wigner-Fano component on the lower energy side of the G À mode in the Raman spectrum as well as a shift of the G þ to lower frequency provide evidence for charge accumulation in the nanotube p system, and indication for the n-type doping. The spectroscopic changes are accompanied by the modification of the electrical properties of the SWCNTs. A reduction of conductivity depends on the doping level and implies the decreasing concentration of the charge carriers in the naturally p-doped tubes. Comparing the two selected n-type dopants, the tetramethyl-p-phenylenediamine, shows more pronounced changes in the XPS and the Raman spectra than tetramethylpyrazine, indicating that the sp 3 hybridization of nitrogen in the amine groups attached to phenyl ring is much more effective in interaction with the tube p system than the sp 2 hybridization of nitrogen in the aromatic pyrazine ring.