01741nas a2200169   4500008004100000022001400041245014100055210006900196260009000265300002300355490000600378520098900384100002401373700002101397700003001418856012301448       2014                        eng d  a2045-232200aCounter-ion dependent, longitudinal unzipping of multi-walled carbon nanotubes to highly conductive and transparent graphene nanoribbons0 aCounterion dependent longitudinal unzipping of multiwalled carbo  aMACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLANDbNATURE PUBLISHING GROUPcMAR  aArticle No. : 43630 v43 a<p>Here we report for the first time, a simple hydrothermal approach for the bulk production of highly conductive and transparent graphene nanoribbons (GNRs) using several counter ions from K2SO4, KNO3, KOH and H2SO4 in aqueous media, where, selective intercalation followed by exfoliation gives highly conducting GNRs with over 80% yield. In these experiments, sulfate and nitrate ions act as a co-intercalant along with potassium ions resulting into exfoliation of multi-walled carbon nanotubes (MWCNTs) in an effective manner. The striking similarity of experimental results in KOH and H2SO4 that demonstrates partially damaged MWCNTs, implies that no individual K+, SO42- ion plays a key role in unwrapping of MWCNTs, rather this process is largely effective in the presence of both cations and anions working in a cooperative manner. The GNRs can be used for preparing conductive 16 k Omega sq(-1), transparent (82%) and flexible thin films using low cost fabrication method.</p>1 aShinde, Dhanraj, B.1 aMajumder, Mainak1 aPillai, Vijayamohanan, K.  uhttps://library.ncl.res.in/content/counter-ion-dependent-longitudinal-unzipping-multi-walled-carbon-nanotubes-highly-001616nas a2200205   4500008004100000245005400041210005400095260000800149300002700157490000800184520096300192100002301155700002401178700002401202700002301226700002101249700003001270700002401300856008601324       2015                        eng d00aGraphene nanoribbons as prospective field emitter0 aGraphene nanoribbons as prospective field emitter  cJAN  aArticle Number: 0231110 v1063 a<p>Field emission characteristics of graphene nanoribbons (GNRs) synthesized by unzipping of multiwall carbon nanotubes using a facile hydrothermal route have been investigated at a base pressure of 1 x 10(-8) mbar. The values of turn-on field, required to draw an emission current densities of 1 and 10 mu A/cm(2), are found to be 2.8 and 5.8 V/mu m, respectively, and a maximum emission current density of 500 mu A/cm(2) has been drawn at an applied field of 9.8 V/mu m. The emission current stability of the GNRs emitter was studied at preset values of 1 and 10 mu A over a period of 3 h, and is found to be excellent. The field emission results demonstrated herein suggest that GNRs based field emitters can open up many opportunities for their potential utilization as large area field emitters in various vacuum micro-nanoelectronic devices such as flexible field emission displays, portable X-ray, and microwave tubes. (C) 2015 AIP Publishing LLC.</p>1 aKhare, Ruchita, T.1 aShinde, Dhanraj, B.1 aBansode, Sanjeewani1 aMore, Mahendra, A.1 aMajumder, Mainak1 aPillai, Vijayamohanan, K.1 aLate, Dattatray, J.  uhttps://library.ncl.res.in/content/graphene-nanoribbons-prospective-field-emitter