01822nas a2200265 4500008004100000022001400041245010300055210006900158260012500227300001100352490000700363520081100370653002101181653002001202653001901222653001501241100002801256700003001284700002401314700002501338700002201363700002301385700002001408856012801428 2010 eng d a0003-695100aHigh current density, low threshold field emission from functionalized carbon nanotube bucky paper0 aHigh current density low threshold field emission from functiona aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScAUG a0731020 v973 a

Field emission studies of bucky paper of multiwalled carbon nanotubes (MWNTs), prepared after microwave (MW) assisted acid functionalization are reported along with a comparison with that of ``as-grown'' sample. MW treated bucky papers reveal an interesting linear field emission behavior in Fowler-Nordheim plot. The field emission currents at preset value are found to be remarkably stable over a period of more than 3 h sustaining current densities of 4.9 mA/cm(2) and 8.5 mA/cm(2) for ``as-grown'' and functionalized sample, respectively. The enhancement in the field emission due to functionalization has been discussed in terms of tip opening and defect induced charge transport caused by intershell and intertubular interaction. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479049]

10aCarbon nanotubes10acurrent density10afield emission10afullerenes1 aKakade, Bhalchandra, A.1 aPillai, Vijayamohanan, K.1 aLate, Dattatray, J.1 aChavan, Padmakar, G.1 aSheini, Farid, J.1 aMore, Mahendra, A.1 aJoag, Dilip, S. uhttps://library.ncl.res.in/content/high-current-density-low-threshold-field-emission-functionalized-carbon-nanotube-bucky-002851nas a2200253 4500008004100000022001400041245010500055210006900160260000800229300001100237490000600248520197200254653002102226653001902247653004502266653001602311100002302327700002402350700002502374700002302399700002402422700002802446856012302474 2019 eng d a2053-159100aGraphene nanosheets assisted carbon hollow cylinder for high-performance field emission applications0 aGraphene nanosheets assisted carbon hollow cylinder for highperf cSEP a0950660 v63 a

Electron sources are critical constituents for myriad many electronic applications including electron imaging, mass spectroscopy etc. Here, we report the realization of high-performance field emission from graphene assisted carbon hollow cylinders (Gr-CHCs) composed of multi-stacked radially aligned CNTs. These CHCs have built-in synthesis related Fe nanoparticles (NPs). This engineered nano-structure exhibits excellent field emission properties such as one of the ultra-low turn-on field (0.64V mu m(-1) at 10 mu A cm(-2)), low threshold field (0.74V mu m(-1) at 100 mu A cm(-2)), very high current density (15.49 mA cm(-2) at 1.32V mu m(-1)) which is nearly double the current density obtained in our previous study. High field enhancement factor (0.72. x. 10(4)) with highly stable emission current at 100 mu A was observed for more than 3 hrs at the base pressure of similar to 1. x. 10(-8) mbar. This study suggests an approach to enhance the current density using the proposed innovative nanostructure and forms the basic theme of this communication. Highly efficient and stable field emissions observed are attributed to the geometry of cylinder and the production of the high density of sharp protrusions within the graphene sheets which enhance the local electric field and dramatically enhance field emission. This innovative cylindrical geometry associated with graphene assisted on Fe bearing aligned CNTs along with the periphery of the bulk cylinder provides an easy injection of electrons from the conduction band of CHCs into the vacuum in the presence of an external electric field. The tunability of field emission properties of these CHCs can be easily achieved by tailoring their diameter (10 and 20 mm) and different concentrations of the precursor. This new approach of the graphene assisted cylindrical geometry-based field emitter source provides enormous prospects and demand for next-generation high resolutions display devices.

10aCarbon nanotubes10afield emission10agraphene assisted carbon hollow cylinder10aprotrusions1 aTripathi, Prashant1 aGupta, Bipin, Kumar1 aBankar, Prashant, K.1 aMore, Mahendra, A.1 aLate, Dattatray, J.1 aSrivastava, Onkar, Nath uhttps://library.ncl.res.in/content/graphene-nanosheets-assisted-carbon-hollow-cylinder-high-performance-field-emission