01343nas a2200157   4500008004100000245011200041210006900153260000800222300001200230490000800242520072900250100002600979700002601005700002401031856013001055       2016                        eng d00aEffect of heterocycles on field-effect transistor performances of donor-acceptor-donor type small molecules0 aEffect of heterocycles on fieldeffect transistor performances of  cSEP  a107-1130 v6613 aTwo D-A-D small molecules comprising triphenylamine and diketopyrrolopyrrole were synthesized having either furan or thiophene connected to the fused lactam ring. In this design, furan/thiophene diketopyrrolopyrrole acts as an acceptor and triphenylamine acts as a donor. Propeller shaped triphenylamine has its effect on packing, processability and plays a vital role in determining the pi-pi molecular orbital stacking in such compounds and thus the mobility of charge carriers. With TDPPT and FDPPT, maximum hole carrier mobility obtained is 2.88 x 10(-3) cm(2) V-1 s(-1) and 1.60 x 10(-3) cm(2) V-1 s(-1), respectively using bottom gate bottom contact field-effect transistor. (C) 2016 Elsevier B.V. All rights reserved.1 aChini, Mrinmoy, Kumar1 aMahale, Rajashree, Y.1 aChatterjee, Shyambo  uhttps://library.ncl.res.in/content/effect-heterocycles-field-effect-transistor-performances-donor-acceptor-donor-type-small-001372nas a2200157   4500008004100000245014500041210006900186260000800255300001000263490000800273520073200281100002601013700001901039700002401058856013201082       2016                        eng d00aF and CF3 substituted solution processable oligo para-phenylenevinylene for ambipolar and hole-transporting organic field effect transistors0 aF and CF3 substituted solution processable oligo paraphenylenevi  cJUL  a26-320 v6573 aWe have synthesized benzotrifluoromethyl group substituted para-phenylenevinylene oligomer (denoted as PI) and a cooligomer (denoted as PII) by Gilch polymerization route. The ambipolar field-effect transistor (FET) material PI shows hole and electron mobility 1 x 10 (4) cm(2) V (1) s (1) and 2 x 10 (5) cm(2) V (1) s (1) respectively. PII shows only hole mobility as high as 0.05 cm(2) V (1) s (1) as p-type material. This work highlights the progress of hole-transporting as well as ambipolar material for para-phenylenevinylene derivatives. The results are enlightened on the basis of presence of electronegative substituents and structural modification of the oligomer backbone. (C) 2016 Elsevier B.V. All rights reserved.1 aChini, Mrinmoy, Kumar1 aDas, Chayanika1 aChatterjee, Shyambo  uhttps://library.ncl.res.in/content/f-and-cf3-substituted-solution-processable-oligo-para-phenylenevinylene-ambipolar-and-hole-001270nas a2200133   4500008004100000245013200041210006900173260000800242490000800250520070600258100002600964700002400990856012201014       2017                        eng d00aEffect of side-chain functionality on the organic field-effect transistor performance of oligo(p-phenylenevinylene) derivatives0 aEffect of sidechain functionality on the organic fieldeffect tra  cJUN0 v1343 aIn order to observe the effects of the substitution of electronegative flourine with aromatic groups in oligo(p-phenylenevinylene) compounds on their packing, morphology, and charge carrier mobility, we have synthesized napthol-substituted oligo(p-phenylenevinylene) compounds and examined their solubility, redox properties, thin film morphologies, and charge carrier properties. To date, very few examples of conjugated oligomers bearing napthol side groups have been reported in the literature. After annealing at 150 degrees C, the mobility of S1, S2, and S3 was 4.0x10(-2) cm(2) V-1 s(-1), 1.2x10(-2) cm(2) V-1 s(-1), and 2.6x10(-3) cm(2) V-1 s(-1), respectively. (c) 2017 Wiley Periodicals, Inc.1 aChini, Mrinmoy, Kumar1 aChatterjee, Shyambo  uhttps://library.ncl.res.in/content/effect-side-chain-functionality-organic-field-effect-transistor-performance-oligop01593nas a2200145   4500008004100000245010200041210007100143260000800214300000800222490000600230520102200236100002601258700002401284856013901308       2017                        eng d00aHydrothermally reduced nano porous graphene–polyaniline nanofiber composites for supercapacitor0 aHydrothermally reduced nano porous graphene–polyaniline nanofibe  cJAN  a1-50 v13 aHydrothermally reduced porous graphene (PGs) and polyaniline (PANI) nanofiber composites (PGs?PANI) were prepared by interfacial polymerization of aniline in the presence of reduced porous graphene (PGs) under acidic conditions. Hydrothermal reduction of graphene oxide (GO) produced graphene quantum dots (GQDs) along with porous reduced graphene (PGs). The removal of nano sized GQDs generate several round shaped edges in the graphene, which facilitated improved charge storage. In addition to preparation of porous graphene, we developed an approach to process the PGs. We envisioned preparing conjugated polymer as processing material. The capacitive behavior of PGs was characterized using cyclic voltammetry (CV) and galvanostatic charge?discharge (GCD) techniques. The specific capacitance of hydrothermally reduced GO (PGs) and PGs?PANI composites was 185 F/g and 357 F/g at 0.1 A/g in 1 M H2SO4 electrolyte. The energy density of PGs?PANI composite was obtained 49.58 W h/kg at a power density of 71.8 W/kg.1 aChini, Mrinmoy, Kumar1 aChatterjee, Shyambo  uhttps://library.ncl.res.in/content/hydrothermally-reduced-nano-porous-graphene%E2%80%93polyaniline-nanofiber-composites-supercapacitor01448nas a2200169   4500008004100000245011300041210006900154260000800223300001200231490000800243520079400251100002601045700002901071700002601100700002301126856012901149       2017                        eng d00aInfluence of thermocleavable functionality on organic field-effect transistor performance of small molecules0 aInfluence of thermocleavable functionality on organic fieldeffec  cJUN  a139-1450 v6783 aDiketopyrrolopyrrole based donor-acceptor-donor conjugated small molecules using ethylene dioxythiophene as a donor was synthesized. Electron deficient diketopyrrolopyrrole unit was substituted with thermocleavable (tert-butyl acetate) side chains. The thermal treatment of the molecules at 160 degrees C eliminated the tert-butyl ester group results in the formation of corresponding acid. Optical and theoretical studies revealed that the molecules adopted a change in molecular arrangement after thermolysis. The conjugated small molecules possessed p-channel charge transport characteristics in organic field effect transistors. The charge carrier mobility was increased after thermolysis of tert-butyl ester group to 5.07 x 10(-5) cm(2)/Vs. (C) 2017 Elsevier B.V. All rights reserved.1 aMahale, Rajashree, Y.1 aDharmapurikar, Satej, S.1 aChini, Mrinmoy, Kumar1 aVenugopalan, Vijay  uhttps://library.ncl.res.in/content/influence-thermocleavable-functionality-organic-field-effect-transistor-performance-small02034nas a2200289   4500008004100000022001400041245010900055210006900164260000800233490000800241520101300249653001001262653008901272653002401361653002101385653001301406653001401419653001901433653001601452653001601468653002601484100002901510700002501539700002601564700002601590856012801616       2017                        eng d  a0021-899500aSynthesis of amphiphilic isoindigo co-polymers for organic field effect transistors: A comparative study0 aSynthesis of amphiphilic isoindigo copolymers for organic field   cNOV0 v1343 a<p><span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; background-color: rgb(248, 248, 248);">In this work, the amphiphilic isoindigo (am-iInd) based conjugated polymers namely poly(am-iInd-DT) and poly(am-iInd-TT) and their regular counterpart poly(reg-iInd-DT) and poly(reg-iInd-TT) were synthesized to compare their opto-electronic and charge transport properties. They were used to fabricate organic field effect transistors. Charge transport properties in conjugated polymers depend upon intermolecular interaction which is strongly affected by the nature of side chains. The amphiphilic nature of the conjugated polymers has little impact on the charge transport properties. The charge carrier mobility of amphiphilic conjugated polymers was comparable with the regular polymers except poly(reg-iInd-DT) which can be correlated by X-ray diffraction and thin film morphology. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45461.</span></p>10aAlkyl10aApplications; Conducting polymers; Copolymers; Optical and Photovoltaic applications10aconjugated polymers10aHigh-performance10amobility10aPackaging10aSemicondoctors10aSide-chains10aSolar-cells10aThin-film Transformer1 aDharmapurikar, Satej, S.1 aArulkashmir, Arulraj1 aMahale, Rajashree, Y.1 aChini, Mrinmoy, Kumar  uhttps://library.ncl.res.in/content/synthesis-amphiphilic-isoindigo-co-polymers-organic-field-effect-transistors-comparative01364nas a2200157   4500008004100000245011900041210006900160260000800229300001000237490000800247520074200255100002600997700002901023700002601052856012801078       2018                        eng d00aChemical oxidative and solid state synthesis of low molecular weight polymers for organic field effect transistors0 aChemical oxidative and solid state synthesis of low molecular we  cMAR  a48-540 v6963 aSolution processability of the precursor molecules is a major issue owing to their limited solubility for the synthesis of conjugated polymers. Therefore, we favour the solvent free solid state chemical oxidative polymerization route for the synthesis of diketopyrrolopyrrole (DPP) based donor-acceptor (D-A) type conjugated polymers. D-A type polymer Poly(S-OD-EDOT) which contains DPP coupled with EDOT donor units is synthesized via solid state polymerization method. The polymer is employed as an active layer for organic field-effect transistors to measure charge transport properties. The Polymer shows good hole mobility 3.1 x 10(-2) cm(2) V-1 s(-1), with a on/off ratio of 1.1 x 10(3). (C) 2018 Elsevier B.V. All rights reserved.1 aMahale, Rajashree, Y.1 aDharmapurikar, Satej, S.1 aChini, Mrinmoy, Kumar  uhttps://library.ncl.res.in/content/chemical-oxidative-and-solid-state-synthesis-low-molecular-weight-polymers-organic-field02005nas a2200229   4500008004100000022001400041245012300055210006900178260000800247300001200255490000600267520117600273653002201449653003101471653003001502653001401532653002701546100002401573700002301597700002601620856012901646       2020                        eng d  a2637-611300aNanoporous reduced graphene oxide and polymer composites as efficient counter electrodes in dye-sensitized solar cells0 aNanoporous reduced graphene oxide and polymer composites as effi  cMAR  a626-6340 v23 a<p>The introduction of an efficient and precious platinum (Pt) free counter electrode (CE) for dye-sensitized solar cells (DSSCs) is an important aspect to address. In this report, we have employed nanoporous reduced graphene oxide (PG) containing PEDOT:PSS-PG composite on FTO substrate as CEs, which have shown excellent diffusion of I-3(-), remarkable photocatalytic activity, and better device performance along with desired stability. The investigated cathode material has been prepared by mixing PGs and highly conducting PEDOT:PSS. Experimental measurements and analyses such as electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and so on indicate that PEDOT:PSS-PG is a promising cathode material for a Pt-free CE in DSSCs. EIS indicates that the PEDOT:PSS-PGs have lower interfacial charge-transfer resistance because of their high electrical conductivity and superior electrocatalytic activity. The achieved photoconversion efficiency (eta) of a DSSC employing the Pt-free PEDOT:PSS-PG/FTO CE is 9.57%, which is found to be comparable to that of Pt/FTO CE based DSSC (9.64%) under a simulated solar light illumination of 100 mW/cm(2).</p>
10acounter electrode10aDye-sensitized solar cells10aelectrocatalytic activity10aPEDOT:PSS10aReduced graphene oxide1 aSudhakar, Vediappan1 aSingh, Anup, Kumar1 aChini, Mrinmoy, Kumar  uhttps://library.ncl.res.in/content/nanoporous-reduced-graphene-oxide-and-polymer-composites-efficient-counter-electrodes-dye01567nas a2200265   4500008004100000022001400041245012800055210006900183260000800252300001100260490000800271520066400279653003100943653001400974653001300988653000901001653002001010100002901030700002701059700001801086700002401104700002101128700002601149856012601175       2021                        eng d  a0009-261400aSignificance of secondary forces toward improving the charge carrier mobility of Isoindigo based conjugated small molecules0 aSignificance of secondary forces toward improving the charge car  cJUL  a1386210 v7743 a<p>The charge carrier mobility of conjugated small molecules (CSMs) depends on the intermolecular interactions and morphology. Herein, we report the synthesis of CSMs having different side chains. Hydrogen bonding, lipophilic imbalance and van der Waals interactions are imparted through the asymmetric substitution of Isoindigo. The secondary forces impact thin film morphology, and charge carrier mobility. The CSMs having van der Waals interaction further shows higher charge carrier mobility as a function of improved morphology, and increased temperature. The highest mobility of 0.15 cm2/Vs has been achieved for CSMs with van der Waals interaction.</p>10aConjugated small molecules10aIsoindigo10amobility10aOFET10aSecondary force1 aDharmapurikar, Satej, S.1 aKashmir, Arulraj, Arul1 aKumari, Tanya1 aKalalawe, Virbhadra1 aKanetkar, Maruti1 aChini, Mrinmoy, Kumar  uhttps://library.ncl.res.in/content/significance-secondary-forces-toward-improving-charge-carrier-mobility-isoindigo-based