01530nas a2200193 4500008004100000022001400041245012100055210006900176260007100245300001400316490000800330520075400338100002401092700002401116700001901140700002001159700003001179856012701209 2011 eng d a0002-786300aElectrochemical unzipping of multi-walled carbon nanotubes for facile synthesis of high-quality graphene nanoribbons0 aElectrochemical unzipping of multiwalled carbon nanotubes for fa a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR a4168-41710 v1333 a

Here we report a remarkable transformation of carbon nanotubes (CNTs) to nanoribbons composed of a few layers of graphene by a two-step electrochemical approach. This consists of the oxidation of CNTs at controlled potential, followed by reduction to form graphene nanoribbons (GNRs) having smooth edges and fewer defects, as evidenced by multiple characterization techniques, including Raman spectroscopy, atomic force microscopy, and transmission electron microscopy. This type of ``unzipping'' of CNTs (single-walled, multi-walled) in the presence of an interfacial electric field provides unique advantages with respect to the orientation of CNTs, which might make possible the production of GNRs with controlled widths and fewer defects.

1 aShinde, Dhanraj, B.1 aDebgupta, Joyashish1 aKushwaha, Ajay1 aAslam, Mohammed1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/electrochemical-unzipping-multi-walled-carbon-nanotubes-facile-synthesis-high-quality-002100nas a2200301 4500008004100000022001400041245012500055210006900180260009500249300001200344490000800356520102200364653003201386653001901418653002601437653000901463653000901472653001801481653003301499100001701532700001901549700002101568700002401589700001801613700001501631700002101646856013101667 2014 eng d a0021-979700aEffect of self-assembly on triiodide diffusion in water based polymer gel electrolytes: an application in dye solar cell0 aEffect of selfassembly on triiodide diffusion in water based pol a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcJUL a110-1170 v4253 a

The preparation of ordered polymer gels from the amphiphilic block copolymers, Pluronic (R) F77, P123 and polyethylene glycol in the presence of ionic liquid, iodine and organic additives is presented. At 35%(w/w) concentration these copolymers (F77 and P123) self-assembled into cubic liquid crystalline phase in aqueous solution and characterized by using SAXS and AFM measurements. The effects of micellar aggregation formed by polymers on the ionic transport and triiodide diffusion have been studied by electro-chemistry and SANS experiments. The ionic migration or triiodide diffusion through these polymer gels is found to be affected by the PEO/PPO content in the polymer backbone. These gels were successfully employed as an electrolyte in a dye sensitized solar cell. A remarkable solar to electricity conversion efficiency and good stability was obtained using Pluronic (R) F77 based gel, which is attributed to its thermoreversible sol to gel transition. (C) 2014 Elsevier Inc. All rights reserved.

10aAmphiphilic block copolymer10aDye solar cell10aMicellar nanochannels10aSANS10aSAXS10aSelf-assembly10aWater based gel electrolytes1 aSoni, S., S.1 aFadadu, K., B.1 aVekariya, R., L.1 aDebgupta, Joyashish1 aPatel, K., D.1 aGibaud, A.1 aAswal, Vinod, K. uhttps://library.ncl.res.in/content/effect-self-assembly-triiodide-diffusion-water-based-polymer-gel-electrolytes-application-002008nas a2200193 4500008004100000022001400041245013500055210006900190260011000259300001400369490000600383520117100389100002401560700002901584700002201613700002501635700003001660856012401690 2014 eng d a2040-336400aElectrochemical preparation of vertically aligned, hollow CdSe nanotubes and their p-n junction hybrids with electrodeposited Cu2O0 aElectrochemical preparation of vertically aligned hollow CdSe na aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAUG a9148-91560 v63 a

Vertically aligned, hollow nanotubes of CdSe are grown on fluorine doped tin oxide (FTO) coated glass substrates by ZnO nanowire template-assisted electrodeposition technique, followed by selective removal of the ZnO core using NH4OH. A detailed mechanism of nucleation and anisotropic growth kinetics of nanotubes have been studied by a combination of characterization tools such as chronoamperometry, SEM and TEM. Interestingly, ``as grown'' CdSe nanotubes (CdSe NTs) on FTO coated glass plates behave as n-type semiconductors exhibiting an excellent photo-response (with a generated photocurrent density value of similar to 470 mu A cm(-2)) white in contact with p-type Cu2O (p-type semiconductor, grown separately on FTO plates) because of the formation of a n-p heterojunction (type II). The observed photoresponse is 3 times higher than that of a similar device prepared with electrodeposited CdSe films (not nanotubes) and Cu2P on FTO. This has been attributed to the hollow 1-D nature of CdSe NTs, which provides enhanced inner and outer surface areas for better absorption of light and also assists faster transport of photogenerated charge carriers.

1 aDebgupta, Joyashish1 aDevarapalli, Rami, Reddy1 aRahman, Shakeelur1 aShelke, Manjusha, V.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/electrochemical-preparation-vertically-aligned-hollow-cdse-nanotubes-and-their-p-n-001719nas a2200181 4500008004100000022001400041245011200055210006900167260000800236300001400244490000700258520105400265100002001319700002401339700002401363700001901387856013101406 2017 eng d a0947-653900aElectrochemical water oxidation catalyzed by an in situ generated alpha-Co(OH)(2) film on zeolite-Y surface0 aElectrochemical water oxidation catalyzed by an in situ generate cJUN a8051-80570 v233 aThe design and synthesis of an efficient and robust water-oxidation catalyst with inexpensive materials remains an important challenge in the context of artificial photosynthesis. Herein, a simple but unique technique is reported to in situ generate a thin-film of alpha-Co(OH)(2) on the surface of zeolite-Y [hereafter referred to as Y-alpha-Co(OH)(2)] that acts as an efficient and stable catalyst for electrochemical water oxidation in alkaline medium. Catalyst Y-alpha-Co(OH)(2) is so stable that it retains its catalytic activity even after 2000 cyclic voltammetric cycles of water oxidation. Expectedly, the chemical composition of alpha-Co(OH)(2) on the surface of zeolite-Y remains same as that of parent Y-alpha-Co(OH)(2) after 2000 electrocatalytic cycles. A Tafel slope as low as 59 mV decade(-1) in 0.1m KOH (pH 13) suggests faster oxygen evolution kinetics (overpotential = 329 mV; turnover frequency = 0.35 mol O-2 (mol Co)(-1)s(-1) at 1 mA cm(-2)) than the existing alpha-Co(OH)(2)-based electrocatalysts operating in alkaline medium.1 aBose, Suranjana1 aDebgupta, Joyashish1 aRamsundar, Rani, M.1 aDas, Samar, K. uhttps://library.ncl.res.in/content/electrochemical-water-oxidation-catalyzed-situ-generated-alpha-cooh2-film-zeolite-y-surface