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Preparation of MWCNT/PDMS Conductive Micro-Patterned Nanocomposites
Saeid Aslnejad,Morteza Nasiri,Farhang Abbasi,Hamed Abdipour 한국고분자학회 2020 Macromolecular Research Vol.28 No.8
Conductive multi-walled carbon nanotube (MWCNT)/polydimethylsiloxane (PDMS) nanocomposites were prepared via solution method and their conductive micro-patterns were made using the doctor blade technique. The prepared patterns were characterized via scanning electron microscopy (SEM), cyclic voltammetry, and four-point probe conductivity meter. SEM images of the cross-sections of micro-patterns revealed that by increasing MWCNT concentration from 5 to 10%, while the dense and smooth bulk structure converted to a brittle one, their conductivities raised from 0.07 up to 0.33 S/cm. These micro-patterns preserved their conductivities under high bending cycles except for high MWCNT loading which loses almost half of its conductivity. The cyclic voltammetry analyses showed that MWCNT/ PDMS conductive micro-patterns had supercapacitor properties. The specific capacitance of the composite containing 10 wt% of MWCNT was 0.35 F/g. These nanocomposites can be used in cochlear implants due to their high conductivities. Their low working voltages ensure the safety of the neural tissues.
Samira Agbolaghi,Sahar Aghapour,Somaiyeh Charoughchi,Farhang Abbasi,Raana Sarvari 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Reduced graphene oxide (rGO) nanosheets were patterned with poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) and poly[bis(triiso-propylsilylethynyl) benzodithiophene-bis(decyltetradecyl-thien) naphthobisthiadiazole] (PBDT-TIPS-DTNT-DT) and used in photovoltaics. Conductive patternings changed via surface modification of rGO; because polymers encountered a high hindrance while assembling onto grafted rGO. The best records were detected in indium tin oxide (ITO):poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS):PBDT-DTNT/rGO:PBDT-DTNT:LiF:Al devices, i.e., short current density (Jsc) = 11.18 mA/cm2, open circuit voltage (Voc) = 0.67 V, fill factor (FF) = 62% and power conversion efficiency (PCE) = 4.64%. PCE increased 2.31 folds after incorporation of PBDT-DTNT into thin films. Larger polymer assemblies on bared-rGO nanosheets resulted in greater phase separations.
Afsaneh Hadi,Mohammad Hossein Hekmatshoar,Farhang Abbasi,Samira Agbolaghi 한국탄소학회 2021 Carbon Letters Vol.31 No.1
Multi-walled carbon nanotube/poly(3-hexylthiophene) (CNT/P3HT) and CNT-graft-poly(3-dodecylthiophene) (PDDT)/P3HT nanohybrids were applied in active layers to study the effects of these nanostructures on the polymer solar cell (PSC) performance. The charge-carrier dynamics and photophysics were studied in the binary and ternary systems based on P3HT, pre-developed nanostructures and/or phenyl-C71-butyric acid methyl ester (PC71BM) through the electrochemical impedance spectroscopy and morphological analyses. The weaker bimolecular recombination in the photoactive layer, consisting of CNT-graft-PDDT/P3HT nanostructures, was confirmed by short-circuit current (Jsc) and open-circuit voltage (Voc) measurements as a function of light intensity. PSC composed of P3HT:PC71BM:CNT-graft-PDDT/P3HT PSC exhibited the highest PCE of 4.18% with significantly increased Jsc and Voc.
Association of amphiphilic block copolymers in dilute solution: With and without shear forces
Zahra Hosseini,Kiyumars Jalili,Sanam Rajabnia,Leila Behboodpour,Farhang Abbasi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
The goal of this study is to investigate the self-assembly of block copolymers in aqueous solution and onlinedemonstration of the morphology transition of micelles under shearflow upon changing thetemperature via rheological measurements. To this end, a series of poly(ethylene glycol)-blockpolycaprolactonecopolymers with variable block ratios and degree of polymerization was synthesizedvia ring opening polymerization of e-caprolactone in the presence of methoxy poly(ethylene glycol)macroinitiator (Mn2000 g/mol), and the ensuing nanoobject assemblies were scrutinized by smallangleneutron scattering. We take advantage of solution rheology control to understand the micellartransition route of amphiphlies.