02001nas a2200193 4500008004100000022001400041245009000055210006900145260008700214300001100301490000800312520125100320100002001571700002201591700002401613700002101637700002601658856012301684 2014 eng d a0003-695100aNegative infrared photocurrent response in layered WS2/reduced graphene oxide hybrids0 aNegative infrared photocurrent response in layered WS2reduced gr a1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScDEC a2435020 v1053 a

We report high performance IR photocurrent response of two-dimensional hybrid materials consisting of layered WS2 nanosheets and reduced graphene oxide (RGO). Comparative photocurrent response studies of WS2 nanosheets, RGO, and WS2/RGO hybrids were carried out by performing current-voltage (I-V) and time-dependent current measurements with a laser excitation source having a wavelength of 808 nm. The experimental investigations indicate that WS2/RGO hybrids show negative photocurrent response, whereas WS2 and RGO show positive photocurrent response. The negative photocurrent response of the WS2/RGO hybrids is explained using a band alignment diagram and attributed to a charge transfer mechanism between WS2 and RGO. This analysis is further corroborated by first-principles density functional calculations. The fabricated device based on WS2/RGO hybrids shows a photosensitivity R-lambda of about 6 AW(-1) and a quantum efficiency eta of similar to 924%, which demonstrates high sensitivity of the hybrid material towards IR detection. WS2/RGO hybrids are therefore promising candidates for potential applications in optoelectronic circuits and low cost, high performance, and reliable photodetectors. (C) 2014 AIP Publishing LLC.

1 aRatha, Satyajit1 aSimbeck, Adam, J.1 aLate, Dattatray, J.1 aNayak, Saroj, K.1 aRout, Chandra, Sekhar uhttps://library.ncl.res.in/content/negative-infrared-photocurrent-response-layered-ws2reduced-graphene-oxide-hybrids-001498nas a2200169 4500008004100000245007000041210006900111260000800180300001200188490000600200520092700206100002401133700002601157700002301183700002001206856010201226 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 uhttps://library.ncl.res.in/content/emerging-energy-applications-two-dimensional-layered-materials01111nas a2200205 4500008004100000022001400041245006100055210006100116260011000177300001400287490000600301520036900307100002000676700002300696700002300719700001800742700002400760700002600784856009500810 2015 eng d a2046-206900aField emission properties of spinel ZnCo2O4 microflowers0 aField emission properties of spinel ZnCo2O4 microflowers aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC a5372-53780 v53 a

ZnCo2O4 microflowers were synthesized by a simple low temperature hydrothermal route. A single three-dimensional microflower consists of hundreds of self-assembled petals, with a thickness of several nanometers. These microflowers have exceptionally thin edges with a few petal layers. The ZnCo2O4 microflowers appeared to be stable and good field emitters.

1 aRatha, Satyajit1 aKhare, Ruchita, T.1 aMore, Mahendra, A.1 aThapa, Ranjit1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar uhttps://library.ncl.res.in/content/field-emission-properties-spinel-znco2o4-microflowers-001599nas a2200181 4500008004100000245008100041210006900122260000800191300001300199490000800212520097300220100002501193700002001218700002301238700002401261700002601285856010601311 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 uhttps://library.ncl.res.in/content/enhanced-field-emission-performance-nimoo4-nanosheets-tuning-phase01548nas a2200181 4500008004100000245009200041210006900133260000800202300001400210490000700224520090300231100002001134700002301154700002001177700002301197700002601220856012001246 2017 eng d00aIron-carbon nanohybrid particles as environmentally benign electrode for supercapacitor0 aIroncarbon nanohybrid particles as environmentally benign electr cFEB a1665-16740 v213 a

In this work, we report the synthesis and electrode applications of iron-carbon nanohybrid particles prepared by carbonization of a nanocomposite of FeOOH nanoneedles and melamine-formaldehyde resin. The chemical composition and microstructure of the material have been characterized using ICP-AES, FT-IR, XRD, FESEM, TEM and XPS. The supercapacitor properties of the MF-Fe-C are studied in detail. A thorough comparison of the supercapacitor performances of MF-Fe-C and bare MF-C has been carried out through detailed electrochemical characterisations employing both two and three-electrode techniques. The nanohybrid showed an enhanced energy density of 127.75 WhKg⁻¹, specific capacitance of ∼408 F g⁻¹ at 1 mVs⁻¹ scan rate, and excellent cyclic stability even after 1000 charge-discharge cycles, making it an intriguing material for high energy density supercapacitor devices.

1 aRatha, Satyajit1 aVernekar, Dnyanesh1 aSivaneri, Kavin1 aJagadeesan, Dinesh1 aRout, Chandra, Sekhar uhttps://library.ncl.res.in/content/iron-carbon-nanohybrid-particles-environmentally-benign-electrode-supercapacitor01549nas a2200181 4500008004100000022001400041245015200055210006900207260000900276300001400285490000600299520084200305100002301147700002001170700002501190700002301215856012901238 2019 eng d a2044-475300aEfficient bifunctional reactivity of K-doped CrO(OH) nanosheets: exploiting the combined role of Cr(iii) and surface -OH groups in tandem catalysis0 aEfficient bifunctional reactivity of Kdoped CrOOH nanosheets exp cMAR  a1154-11640 v93 a

This work reports the bifunctional catalytic activity of layered K-doped alpha-CrO(OH). The combined action of the redox active Cr(III) and the surface hydroxyl groups was efficiently used to carry out 2-3 oxidation reactions in tandem followed by condensation/coupling reactions in one pot. Oxidation of benzyl alcohol followed by Knoevenagel condensation or coupling reactions forming C-C and C-N linkages in one pot is demonstrated. The catalyst has been characterized using XRD, IR, TGA, CO2-TPD, cyclic voltammetry, XPS and microscopic techniques to gain insight into the nature of active sites. The role of O- and O2- on the CrO(OH) catalyst in the bifunctional activity was studied using analytical techniques. Recyclability and leaching tests confirmed that K-alpha-CrO(OH) is a stable and environmentally safe catalyst.

1 aVernekar, Dnyanesh1 aRatha, Satyajit1 aRode, Chandrashekhar1 aJagadeesan, Dinesh uhttps://library.ncl.res.in/content/efficient-bifunctional-reactivity-k-doped-crooh-nanosheets-exploiting-combined-role-criii02191nas a2200277 4500008004100000022001400041245012300055210006900178260000900247300001600256490000700272520125600279653001601535653002501551653002401576653003001600653002101630100002301651700002101674700002001695700000501715700001601720700002301736700002301759856013101782 2021 eng d a2155-543500aDirect oxidation of cyclohexane to adipic acid by a WFeCoO(OH) catalyst: role of bronsted acidity and oxygen vacancies0 aDirect oxidation of cyclohexane to adipic acid by a WFeCoOOH cat cSEP  a10754-107660 v113 aThis work reports the catalytic activity of the trimetallic mixed-metal oxyhydroxide WFeCoO(OH) for the direct oxidation of cyclohexane to adipic acid (AA) without the use of concentrated HNO3. WFeCoO(OH) displayed a 40% conversion of cyclohexane and a 67% selectivity to AA under relatively milder conditions of temperature (90 degrees C) and pressure (1 atm). Experimental evidence confirmed the presence of acidic, basic, and redox sites on WFeCoO(OH). The detailed investigation revealed that doping W in the Co-FeO(OH) matrix increased the amount of surface lattice oxygen (OS-L) and caused a significant surge in acidity (5.1 mmol/g). The calculated deprotonation energy of WFeCoO(OH) was 1434 kJ/mol, and the trend in acidity was WCoO(OH) < WFeCoO(OH) < FeCoO(OH) similar to CoO(OH). Energy calculations showed that WFeCoO(OH) had a high propensity to generate oxygen vacancies by the loss of either a water molecule or an oxygen atom (-132.2 or -140.9 kJ/mol, respectively). Basicity was generated due to the presence of conjugate pairs of the surface hydroxyl groups. The combined action of the trifunctional acidic, basic, and redox-active metal centers along with the oxygen vacancies was responsible for the enhanced catalytic performance.10aAdipic Acid10adeprotonation energy10ametal oxyhydroxides10amultifunctional catalysts10aoxygen vacancies1 aVernekar, Dnyanesh1 aDayyan, Mohammad1 aRatha, Satyajit1 a1 aHaider, Ali1 aKhan, Tuhin, Suvra1 aJagadeesan, Dinesh uhttps://library.ncl.res.in/content/direct-oxidation-cyclohexane-adipic-acid-wfecoooh-catalyst-role-bronsted-acidity-and-oxygen