01884nas a2200229   4500008004100000022001400041245009800055210006900153260011000222300001600332490000600348520097300354100002601327700002601353700002801379700002301407700001801430700002401448700002401472700002601496856013201522       2015                        eng d  a2046-206900aFacile synthesis of Ag nanowire-rGO composites and their promising field emission performance0 aFacile synthesis of Ag nanowirerGO composites and their promisin  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAPR  a41887-418930 v53 a<p>Crystalline, ultra long silver nanowires (Ag NWs), few-layered rGO (reduced graphene oxide) and their rGO-Ag NW nanocomposite have been synthesized using a polyol reflux technique under optimized experimental conditions. The field emission performance of the rGO-Ag NW nanocomposite, rGO and Ag NW emitters was investigated. The turn on field required to draw an emission current density of similar to 1 mA cm(-2) was found to be similar to 5.00, 3.92 and 2.40 V mu m(-1) for the Ag NW, rGO and rGO-Ag NW nanocomposite emitters, respectively. The combined contribution of the sharp edges of the thin graphene sheets and high aspect ratio of the Ag nanowires, and their synergetic effect in the rGO-Ag NW nanocomposite, are responsible for the enhanced field emission behavior. First-principles density functional calculations show that the enhanced field emission may also be due to the overlapping of the electronic structures of the Ag NWs and rGO nanosheets.</p>1 aSamantara, Aneeya, K.1 aMishra, Dillip, Kumar1 aSuryawanshi, Sachin, R.1 aMore, Mahendra, A.1 aThapa, Ranjit1 aLate, Dattatray, J.1 aJena, Bikash, Kumar1 aRout, Chandra, Sekhar  uhttps://library.ncl.res.in/content/facile-synthesis-ag-nanowire-rgo-composites-and-their-promising-field-emission-performance-002234nas a2200205   4500008004100000245010700041210006900148260000800217300001400225490000600239520149100245100002801736700002401764700002001788700002401808700002401832700002101856700002301877856012801900       2016                        eng d00aFacile approach towards fabrication of GdB6-ZnO heteroarchitecture as high currentdensity cold cathode0 aFacile approach towards fabrication of GdB6ZnO heteroarchitectur  cAUG  a3723-37290 v13 aThree dimensional (3D) GdB6-ZnO heteroarchitecture comprised of thin coating of GdB6 on self aligned ZnO urchins with pointed apex has been synthesized employing optimized Pulsed Laser Deposition (PLD) technique. The self aligned ZnO urchins on Zn substrate were obtained using hydrothermal route. The as-synthesized GdB6-ZnO heteroarchitecture was characterized using XRD, SEM, TEM XPS, and UPS in order to reveal its structural, morphological, chemical, and electronic properties. Interestingly, the GdB6-ZnO heteroarchitecture exhibits superior field emission (FE) behviour in contrast to the pristine ZnO urchins envisaged by extraction of very high emission current density of similar to 4.6 mA/cm(2) at an applied field of similar to 4.5 V/mm, against similar to 1.5 mA/cm(2) at an applied field of similar to 5.6 V/mm from the pristine ZnO urchins emitter. Furthermore, the GdB6-ZnOemitter exhibits good emission stability at pre-set value of similar to 5 mA over duration of more than 3 hours. The superior FE behaviour of the GdB6-ZnO is attributed to low work-function of GdB6 and presence of nanometric protrusions on the emitter surface, further enhancing the aspect ratio provided by the ZnO urchins. The present results demonstrate a facile approach towards fabrication of high current density cold cathodes due to rare earth hexaborides via designing hetero-architectures comprised of their well adherent ultrathin coating on high aspect ratio metal oxide nanostructures.1 aSuryawanshi, Sachin, R.1 aMistari, Chetan, D.1 aSingh, Anil, K.1 aPhase, Deodatta, M.1 aLate, Dattatray, J.1 aSinha, Sucharita1 aMore, Mahendra, A.  uhttps://library.ncl.res.in/content/facile-approach-towards-fabrication-gdb6-zno-heteroarchitecture-high-currentdensity-cold02264nas a2200277   4500008004100000022001400041245008700055210006900142260011000211300001400321490000600335520127700341100002401618700002001642700001701662700001801679700002801697700001901725700001801744700001601762700001801778700002301796700002401819700002201843856012101865       2016                        eng d  a2046-206900aField emission properties of highly ordered low-aspect ratio carbon nanocup arrays0 aField emission properties of highly ordered lowaspect ratio carb  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN  a9932-99390 v63 a<p>Herein, we design and develop a field emission device utilizing highly porous carbon nanocup (CNC) films. These three-dimensional (3D) low-aspect ratio CNC structures were fabricated by a combination of anodization and chemical vapor deposition techniques. The low turn-on fields of 2.30 V mu m(-1) were observed to draw an emission current density of 1 mu A cm(-2) and a maximum emission current density of similar to 1.802 mA cm(-2) drawn at an applied field of similar to 4.20 V mu m(-1). The enhanced field emission behavior observed from the CNC films is attributed to an excellent field enhancement factor of 1645. The observed field emission properties of CNC arrays are attributed to a synergistic combination of high aspect ratio, nano-sized radius of curvature, highly organized distribution of the emitters over the whole area of specimen and lower screening effect of the CNC arrays. These observations shed light on the effect of the stacking carbon layers of CNC on their electronic properties and open up possibilities to integrate new morphologies of graphitic carbon in nanotechnology applications. Thus, the low turn on field, high emission current density and better emission current stability enable CNC based future field emission applications.</p>1 aGupta, Bipin, Kumar1 aKedawat, Garima1 aKumar, Pawan1 aSingh, Satbir1 aSuryawanshi, Sachin, R.1 aAgrawal, Neetu1 aGupta, Govind1 aKim, Ah, Ra1 aGupta, R., K.1 aMore, Mahendra, A.1 aLate, Dattatray, J.1 aHahm, Myung, Gwan  uhttps://library.ncl.res.in/content/field-emission-properties-highly-ordered-low-aspect-ratio-carbon-nanocup-arrays-0