02122nas a2200241 4500008004100000022001400041245008600055210006900141260012500210300001100335490000800346520120400354100002601558700002601584700002301610700002001633700002301653700002201676700002301698700002101721700002401742856011401766 2014 eng d a0003-695100aEnhanced field emission properties of doped graphene nanosheets with layered SnS20 aEnhanced field emission properties of doped graphene nanosheets  aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScJUL a0431090 v1053 a

We report here our experimental investigations on p-doped graphene using tin sulfide (SnS2), which shows enhanced field emission properties. The turn on field required to draw an emission current density of 1 mu A/cm(2) is significantly low (almost half the value) for the SnS2/reduced graphene oxide (RGO) nanocomposite (2.65 V/mu m) compared to pristine SnS2 (4.8 V/mu m) nanosheets. The field enhancement factor beta (similar to 3200 for the SnS2 and similar to 3700 for SnS2/RGO composite) was calculated from Fowler-Nordheim (F-N) plots, which indicates that the emission is from the nanometric geometry of the emitter. The field emission current versus time plot shows overall good emission stability for the SnS2/RGO emitter. The magnitude of work function of SnS2 and a SnS2/graphene composite has been calculated from first principles density functional theory (DFT) and is found to be 6.89 eV and 5.42 eV, respectively. The DFT calculations clearly reveal that the enhanced field emission properties of SnS2/RGO are due to a substantial lowering of the work function of SnS2 when supported by graphene, which is in response to p-type doping of graphene. (C) 2014 AIP Publishing LLC.

1 aRout, Chandra, Sekhar1 aJoshi, Padmashree, D.1 aKashid, Ranjit, V.1 aJoag, Dilip, S.1 aMore, Mahendra, A.1 aSimbeck, Adam, J.1 aWashington, Morris1 aNayak, Saroj, K.1 aLate, Dattatray, J. uhttp://library.ncl.res.in/content/enhanced-field-emission-properties-doped-graphene-nanosheets-layered-sns2-001497nas a2200169 4500008004100000245007000041210006900111260000800180300001200188490000600200520092700206100002401133700002601157700002301183700002001206856010101226 2015 eng d00aEmerging energy applications of two-dimensional layered materials0 aEmerging energy applications of twodimensional layered materials cMAR a118-1570 v33 a

Atomically thin semiconducting transition metal dichalcogenides (TMDCs) layered materials have recently been emerged as an exciting area of research due to accessibility for easy synthesis using various chemical and physical methods. These two-dimensional (2D) layered materials with single layer have direct and wide band gap due to which, they are more suitable for nanoelectronics and optoelectronics device applications. Here, we present a review of the energy related aspects of atomically thin layered materials like MoS2, WS2, MoSe2, WSe2, InSe, GaSe, GaTe, MoTe2, WTe2 etc. for supercapacitor, solar cell, lithium ion battery and water splitting application. By significantly assessing various materials and comparing their performances with challenging technology, the advantages and disadvantages of this promising area of energy materials are recognized, which may provide guidelines for future progress.

1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar1 aChakravarty, Disha1 aRatha, Satyajit uhttp://library.ncl.res.in/content/emerging-energy-applications-two-dimensional-layered-materials01761nas a2200277 4500008004100000022001400041245006700055210006700122260008100189300001100270490000600281520085000287653003001137653001901167653001501186653001201201653001101213100002301224700002301247700002401270700002301294700001801317700002401335700002601359856009801385 2015 eng d a2053-159100aEnhanced electron field emission from NiCo2O4 nanosheet arrays0 aEnhanced electron field emission from NiCo2O4 nanosheet arrays aTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLANDbIOP PUBLISHING LTDcSEP a0950110 v23 a

Electron emission properties of electrodeposited spinel NiCo2O4 nanosheet arrays grown on Ni foam have been studied. The work function of NiCo2O4 was calculated by density functional theory using the plane-wave basis set and used to estimate the field enhancement factor. The NiCo2O4 nanosheet arrays exhibited a low turn-on field of 1.86 V mu m(-1) at 1 mu A cm(-2) and current density of 686 mu A cm(-2) at 3.2 V mu m(-1), with field enhancement factor beta = 1460 and good field emission current stability. The field emission properties of the NiCo2O4 nanosheet arrays showed enhanced performance compared to chemically prepared NiCo2O4 nanosheets. Hence, the nanosheet arrays have great potential as robust high performance vertical structure electron emitters for future flat panel displays and vacuum electronic device applications.

10aDensity functional theory10afield emission10ananosheets10aNiCo2O410aspinel1 aNaik, Kusha, Kumar1 aKhare, Ruchita, T.1 aGelamo, Rogerio, V.1 aMore, Mahendra, A.1 aThapa, Ranjit1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar uhttp://library.ncl.res.in/content/enhanced-electron-field-emission-nico2o4-nanosheet-arrays-101324nas a2200193 4500008004100000022001400041245006600055210006600121260008700187300001100274490000800285520061800293100002300911700002400934700002300958700002400981700002601005856009901031 2015 eng d a0003-695100aEnhanced field emission of plasma treated multilayer graphene0 aEnhanced field emission of plasma treated multilayer graphene a1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScSEP a1235030 v1073 a

Electron emission properties of multilayer graphene (MLG) prepared by a facile exfoliation technique have been studied. Effect of CO2 Ar, N-2, plasma treatment was studied using Raman spectroscopy and investigated for field emission based application. The CO2 plasma treated multilayer graphene shows an enhanced field emission behavior with a low turn on field of 0.18 V/mu m and high emission current density of 1.89 mA/cm(2) at an applied field of 0.35 V/mu m. Further the plasma treated MLG exhibits excellent current stability at a lower and higher emission current value. (C) 2015 AIP Publishing LLC.

1 aKhare, Ruchita, T.1 aGelamo, Rogerio, V.1 aMore, Mahendra, A.1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar uhttp://library.ncl.res.in/content/enhanced-field-emission-plasma-treated-multilayer-graphene-101765nas a2200217 4500008004100000022001400041245015400055210006900209260011000278300001600388490000600404520084700410100002201257700002201279700002501301700002401326700002401350700002601374700002401400856012301424 2016 eng d a2046-206900aEffect of plasma treatment on multilayer graphene: X-ray photoelectron spectroscopy, surface morphology investigations and work function measurements0 aEffect of plasma treatment on multilayer graphene Xray photoelec aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY a48843-488500 v63 a

We report here the effect of plasma treatment on multilayer graphene samples as determined by X-ray photoelectron spectroscopy and surface morphology studies with atomic force microscopy, scanning electron microscopy and transmission electron microscopy. The plasma treatment was modified to introduce controlled levels of defects and functionalities to the graphene samples to give tunable properties. The elemental composition and structure were investigated by XPS and micro Raman spectroscopy. The XPS study showed that there was a slight variation in the sp(2)/sp(3) hybridization ratio between the plasma-treated samples and the pristine sample. Kelvin probe measurements were carried out on all the multilayer graphene samples and indicated a slight variation in the work function of the graphene samples after plasma treatment.

1 aPatil, Urmila, V.1 aPawbake, Amit, S.1 aMachuno, Luis, G. B.1 aGelamo, Rogerio, V.1 aJadkar, Sandesh, R.1 aRout, Chandra, Sekhar1 aLate, Dattatray, J. uhttp://library.ncl.res.in/content/effect-plasma-treatment-multilayer-graphene-x-ray-photoelectron-spectroscopy-surface01570nas a2200169 4500008004100000245012500041210006900166260000800235300001200243490000800255520091500263100001801178700002301196700002401219700002601243856013101269 2017 eng d00aElectrochemical synthesis of a ternary transition metal sulfide nanosheets on nickel foam and energy storage application0 aElectrochemical synthesis of a ternary transition metal sulfide  cFEB a154-1610 v6953 aWe report growth of nickel cobalt sulfide (NCS) ultrathin nanosheets directly on Ni foam substrate by a facile and novel electrodeposition method. The as-prepared NCS sample is used as an electrode material for supercapacitor application due to their large electrochemically active surface area and interconnected nanosheet channels for the facilitation of ion transportation. The NCS nanosheets possess enhanced electrochemical performance in terms of fast and high reversible faradaic reactions characterized by prominent oxidation and reduction peaks. NCS nanosheets showed an ultrahigh specific capacitance of 1712 Fg(-1) at a current density of 1 Ag-1 with excellent cyclic stability. The excellent supercapacitor performance of NCS nanosheets can be attributed to its rich redox reactions as well as high transport rate for both electrolyte ions and electrons. (C) 2016 Elsevier B.V. All rights reserved.1 aSahoo, Surjit1 aNaik, Kusha, Kumar1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar uhttp://library.ncl.res.in/content/electrochemical-synthesis-ternary-transition-metal-sulfide-nanosheets-nickel-foam-and-energy01598nas a2200181 4500008004100000245008100041210006900122260000800191300001300199490000800212520097300220100002501193700002001218700002301238700002401261700002601285856010501311 2017 eng d00aEnhanced field emission performance of NiMoO4 nanosheets by tuning the phase0 aEnhanced field emission performance of NiMoO4 nanosheets by tuni cOCT a270-274 0 v4183 aIn this paper we report, large scale synthesis of a and beta-NiMoO4 by a facile hydrothermal method and we observed that urea plays important role on the growth of beta-NiMoO4 nanosheets. We have also carried out field emission (FE) investigations of alpha and beta-NiMoO4 at a base pressure of similar to 1 x 10(-8) mbar. The obtained turn-on field at emission current density of 1 mu A/cm(2) for beta-NiMoO4 nanosheets and alpha-NiMoO4 is 1.3V/mu m and 2.2V/mu m respectively were observed. The maximum field emission current density of 1.006 mA/cm(2) at an applied electric field of 2.7V/mu m was achieved for beta-NiMoO4 nanosheets. Furthermore, we found that the beta-NiMoO4 nanosheets possess good field emission performance compared to alpha-NiMoO4. The results indicate that NiMoO4 can be used as a promising material in FE applications with possibility of tuning field emission performance by controlling the phase. (C) 2017 Elsevier B.V. All rights reserved.1 aBankar, Prashant, K.1 aRatha, Satyajit1 aMore, Mahendra, A.1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar uhttp://library.ncl.res.in/content/enhanced-field-emission-performance-nimoo4-nanosheets-tuning-phase01985nas a2200181 4500008004100000245011900041210006900160260000800229520126700237100002501504700002201529700002101551700002101572700002901593700002401622700002601646856013101672 2019 eng d00aExperimental and density functional theory investigations of catechol sensing properties of ZnO/RGO nanocomposites0 aExperimental and density functional theory investigations of cat cNOV3 a

Catechol, an essential industrial feedstock is one of the major environmental pollutant which causes several health issues including skin irritation, eye damage and genetic defects. In this work, we have investigated the catechol sensing performance of ZnO/RGO composites for its quantitative detection. ZnO/RGO composite showed superior electron transfer kinetics, sensitivity (162.04 mu A mM cm(-2)) and lower detection limit (47 nM) than that of bare ZnO nanoparticles. Further, the change in the zeta potential towards the lower negative demonstrated the strong electrostatic interaction between ZnO-RGO and catechol where it is converted as 1, 2 Benzoquinone through redox reactions. By using state of the art of Density Functional Theory simulations, we have demonstrated the interaction of catechol molecule on various ZnO clusters and RGO supported ZnO clusters. The strong bonding between p orbital of O atom of catechol and d orbital of Zn atom and its charge transfer facilitate the oxidation of catechol molecule. In the presence of RGO, the binding energy of catechol and charge transfer increases which qualitatively infer that RGO/ZnO exhibits higher sensitivity compared to bare ZnO and in consistency with the experimental observations.

1 aPonnusamy, Rajeswari1 aVenkatesan, Rajiu1 aGangan, Abhijeet1 aSamal, Rutuparna1 aChakraborty, Brahmananda1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar uhttp://library.ncl.res.in/content/experimental-and-density-functional-theory-investigations-catechol-sensing-properties-znorgo