01819nas a2200265 4500008004100000022001400041245011900055210006900174260007300243300001000316490000700326520085300333653002701186653002101213653001901234653002801253653002401281100002001305700002101325700001801346700002201364700002501386700002101411856012101432 2011 eng d a0927-776500aSynthesis of silver nanoparticles in an aqueous suspension of graphene oxide sheets and its antimicrobial activity0 aSynthesis of silver nanoparticles in an aqueous suspension of gr aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR a16-220 v833 a

A solution-based approach to the synthesis of silver (Ag) nanoparticles by chemical reduction of AgNO3 in a graphene oxide (GrO) suspension is demonstrated. X-ray diffraction and transmission electron microscopy indicate that the Ag nanoparticles, of size range 5-25 nm, were decorated on the GrO sheets. The size and shape of the Ag nanoparticles are dependent on the concentration of the AgNO3 solution. Antimicrobial activity of such hybrids materials is investigated against the Gram negative bacteria Escherichia coli and Pseudomonous aeruginosa. The bacterial growth kinetics was monitored in nutrient broth supplemented with the Ag nanoparticle-GrO suspension at different conditions. It was observed that P. aeruginosa is comparatively more sensitive to the Ag nanoparticle-GrO suspension. (C) 2010 Elsevier B.V. All rights reserved.

10aAntimicrobial activity10aEscherichia coli10agraphene oxide10aPseudomonous aeruginosa10aSilver nanoparticle1 aDas, Manash, R.1 aSarma, Rupak, K.1 aSaikia, Ratul1 aKale, Vinayak, S.1 aShelke, Manjusha, V.1 aSengupta, Pinaki uhttps://library.ncl.res.in/content/synthesis-silver-nanoparticles-aqueous-suspension-graphene-oxide-sheets-and-its-001897nas a2200217 4500008004100000022001400041245012200055210006900177260011000246300001400356490000600370520100900376100002901385700002301414700002601437700002101463700002001484700002301504700002501527856012701552 2013 eng d a2050-752600aHigh efficiency electron field emission from protruded graphene oxide nanosheets supported on sharp silicon nanowires0 aHigh efficiency electron field emission from protruded graphene  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUN a5040-50460 v13 a

Graphene oxide (GO) potentially has applications in vacuum microelectronic devices for realization of field emission displays. Graphene and its derivatives are expected to be efficient field emitters due to their unique electrical properties. However, the flat sheet structure of graphene or GO allows electron field emission only from the edges of graphene and GO nanosheets. In order to extract maximum field emission current density at lower applied voltage from the GO nanosheets, we supported and stretched them on sharp tips of silicon nanowires (SiNWs). Highly efficient and stable field emission with low turn-on field was observed for these SiNW-GO heterostructures. The sharp protrusions created by stretching of the GO nanosheets on SiNWs locally enhance the electric field and thus enhance the field emission characteristics. The dominant use of silicon in electronic devices makes this approach robust for the development of field emission devices using graphene based field emitters.

1 aDevarapalli, Rami, Reddy1 aKashid, Ranjit, V.1 aDeshmukh, Ashvini, B.1 aSharma, Ponchami1 aDas, Manash, R.1 aMore, Mahendra, A.1 aShelke, Manjusha, V. uhttps://library.ncl.res.in/content/high-efficiency-electron-field-emission-protruded-graphene-oxide-nanosheets-supported-001833nas a2200301 4500008004100000022001400041245012300055210006900178260007300247300001200320490000800332520075300340653002301093653001901116653001501135653002101150653001601171653001801187653003201205100002201237700002001259700002901279700002501308700002201333700002201355700002301377856013101400 2013 eng d a0926-337300aOne-pot synthesis of gold nanoparticle/molybdenum cluster/graphene oxide nanocomposite and its photocatalytic activity0 aOnepot synthesis of gold nanoparticlemolybdenum clustergraphene  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB a270-2760 v1303 a

The paper reports on a facile one-pot synthesis of a tri-component gold nanoparticle/molybdenum cluster/graphene oxide (AuNPs@Mo-GO) nanohybrid composite. The synthetic methodology consists on direct UV irradiation of an aqueous solution containing graphene oxide (GO), Na-2[Mo6Br8(N-3)(6)], HAuCl4 center dot 3H(2)O and isopropanol at room temperature in air using a UV fiber lamp. The composite material exhibits very high photocatalytic activity for the degradation of rhodamine B under visible light irradation. The resulting nanohybrid material was characterized using Raman spectroscopy, UV-vis spectrometry, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). (c) 2012 Elsevier B.V. All rights reserved.

10agold nanoparticles10agraphene oxide10aNanohybrid10aPhotodegradation10aRhodamine B10avisible light10a[Mo6Br8(N-3)(6)](2-)cluster1 aBarras, Alexandre1 aDas, Manash, R.1 aDevarapalli, Rami, Reddy1 aShelke, Manjusha, V.1 aCordier, Stephane1 aSzunerits, Sabine1 aBoukherroub, Rabah uhttps://library.ncl.res.in/content/one-pot-synthesis-gold-nanoparticlemolybdenum-clustergraphene-oxide-nanocomposite-and-its-002032nas a2200217 4500008004100000022001400041245020200055210006900257260011000326300001400436490000700450520106400457100002001521700001901541700002601560700001901586700003301605700002501638700002001663856013101683 2015 eng d a1144-054600aGreen approach for the decoration of Pd nanoparticles on graphene nanosheets: an in situ process for the reduction of C-C double bonds and a reusable catalyst for the suzuki cross-coupling reaction0 aGreen approach for the decoration of Pd nanoparticles on graphen aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUN a6631-66410 v393 a

A new strategy for in situ synthesis of palladium nanoparticles (Pd NPs) decorated on reduced graphene oxide (rGO) nanosheets with controlled size and shape is reported. This strategy was designed as three processes in one pot, namely, (a) reduction of graphene oxide, (b) formation of Pd NPs on the rGO nanosheets and (c) simultaneous reduction of olefin. In this synthesis process, a hydrogen atmosphere was used to develop the Pd NPs-rGO nanocatalyst, which is reusable and easily separable. The influence of the size and morphology of the Pd-rGO-H-2 catalyst on the catalytic activity in the Suzuki cross-coupling reaction was investigated by comparing with other catalysts, Pd-rGO-As and Pd-rGO-Gl, and they were synthesized by different reducing agents, ascorbic acid and glucose, respectively. The catalysts were characterized by electron microscopy (HRTEM, SEM), FT-IR, XRD and XPS. The Pd-rGO-H-2 catalyst was found to possess excellent catalytic activity and recyclability in the Suzuki cross-coupling reaction under mild reaction conditions.

1 aHussain, Najrul1 aBorah, Ashwini1 aDarabdhara, Gitashree1 aGogoi, Pranjal1 aAzhagan, Muniraj, Vedi Kuyil1 aShelke, Manjusha, V.1 aDas, Manash, R. uhttps://library.ncl.res.in/content/green-approach-decoration-pd-nanoparticles-graphene-nanosheets-situ-process-reduction-c-c-001736nas a2200193 4500008004100000022001400041245020100055210006900256260011000325300001400435490000600449520084500455100002001300700001901320700003301339700002501372700002001397856012501417 2015 eng d a2044-475300aGreen synthesis of stable Cu(0) nanoparticles onto reduced graphene oxide nanosheets: a reusable catalyst for the synthesis of symmetrical biaryls from arylboronic acids under base-free conditions0 aGreen synthesis of stable Cu0 nanoparticles onto reduced graphen aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV a1251-12600 v53 a

Highly stable Cu(0) nanoparticles were synthesized on reduced graphene oxide (rGO) sheets using a cost-effective and green method. The synthesized Cu(0)-nanoparticle-rGO composites exhibit excellent catalytic activity for the synthesis of symmetrical biaryls from arylboronic acids under microwave irradiation. The reaction proceeds smoothly in base-free conditions with easy recovery and reuse of the catalyst. The methodology is compatible with various functional groups and provides an attractive protocol for the synthesis of symmetrical biaryls with very good yields. HRTEM, XPS and XRD analyses showed the catalyst to be recyclable. The Cu(0) nanoparticles are stable in the rGO nanosheets, and the particle size distribution and oxidation state of the Cu(0) nanoparticle remain the same after performing the chemical reaction.

1 aHussain, Najrul1 aGogoi, Pranjal1 aAzhagan, Muniraj, Vedi Kuyil1 aShelke, Manjusha, V.1 aDas, Manash, R. uhttps://library.ncl.res.in/content/green-synthesis-stable-cu0-nanoparticles-reduced-graphene-oxide-nanosheets-reusable-301213nas a2200193 4500008004100000022001400041245022400055210006900279260011000348300001400458490000600472520029900478100002000777700001900797700003300816700002500849700002000874856012500894 2016 eng d a2044-475300aGreen synthesis of stable Cu(0) nanoparticles onto reduced graphene oxide nanosheets: a reusable catalyst for the synthesis of symmetrical biaryls from arylboronic acids under base-free conditions (vol 5, pg 1251, 2015)0 aGreen synthesis of stable Cu0 nanoparticles onto reduced graphen aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB a1234-12340 v63 a

Correction for ‘Green synthesis of stable Cu(0) nanoparticles onto reduced graphene oxide nanosheets: a reusable catalyst for the synthesis of symmetrical biaryls from arylboronic acids under base-free conditions’ by Najrul Hussain et al., Catal. Sci. Technol., 2015, 5, 1251–1260.

1 aHussain, Najrul1 aGogoi, Pranjal1 aAzhagan, Muniraj, Vedi Kuyil1 aShelke, Manjusha, V.1 aDas, Manash, R. uhttps://library.ncl.res.in/content/green-synthesis-stable-cu0-nanoparticles-reduced-graphene-oxide-nanosheets-reusable-202517nas a2200241 4500008004100000022001400041245017300055210006900228260011000297300001600407490000600423520150400429100002201933700002701955700002601982700003102008700002202039700002502061700002002086700001802106700002002124856013102144 2016 eng d a2046-206900aSunlight assisted degradation of dye molecules and reduction of toxic Cr(VI) in aqueous medium using magnetically recoverable Fe3O4/reduced graphene oxide nanocomposite0 aSunlight assisted degradation of dye molecules and reduction of  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN a11049-110630 v63 a

In view of the significant impact of magnetically recoverable catalysts in photocatalytic applications, Fe3O4/reduced graphene oxide (rGO) nanocomposite photocatalyst was synthesized by adopting an eco-friendly solution chemistry approach and has been characterized by high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and photoluminescence (PL) spectroscopy. Fe3O4/rGO nanocomposite is efficiently utilized towards photocatalytic degradation of carcinogenic and mutagenic cationic as well as anionic dye molecules namely methyl green (MG), methyl blue (MB) and rhodamine B (RhB) under direct sunlight irradiation. The Fe3O4/rGO nanocomposite also demonstrated excellent photocatalytic reduction of aqueous Cr(VI) solution to nontoxic aqueous Cr(III) solution of more than 96% within 25 min under sunlight irradiation. Moreover, reusability of the magnetically recovered photocatalyst was studied efficiently up to 10 cycles in the degradation process. The catalyst was also characterized after the degradation of the dye molecule and the particle size of the Fe3O4 nanoparticles on the rGO sheets remained unchanged. The present investigation focuses on the importance of the use of Fe3O4/rGO nanocomposite towards photocatalytic degradation of waste water containing organic dye pollutants and toxic Cr(VI), as an easily recoverable and reusable photocatalyst with potential for many environmental remediation applications.

1 aBoruah, Purna, K.1 aBorthakur, Priyakshree1 aDarabdhara, Gitashree1 aKamaja, Chaitanya, Krishna1 aKarbhal, Indrapal1 aShelke, Manjusha, V.1 aPhukan, Pallabi1 aSaikia, Dulen1 aDas, Manash, R. uhttps://library.ncl.res.in/content/sunlight-assisted-degradation-dye-molecules-and-reduction-toxic-crvi-aqueous-medium-using-002039nas a2200169 4500008004100000245018200041210006900223260000800292490000800300520131700308100002201625700002501647700002201672700002501694700002001719856013001739 2017 eng d00aAmmonia-modified graphene sheets decorated with magnetic Fe3O4 nanoparticles for the photocatalytic and photo-Fenton degradation of phenolic compounds under sunlight irradiation0 aAmmoniamodified graphene sheets decorated with magnetic Fe3O4 na cNOV0 v3253 aSynthesis of easily separable and eco-friendly efficient catalyst with both photocatalytic and photo-Fenton degradation properties is of great importance for environment remediation application. Herein, ammonia-modified graphene (AG) sheets decorated with Fe3O4 nanoparticles (AG/Fe3O4) as a magnetically recoverable photocatalyst by a simple in situ solution chemistry approach. First, we have functionalized graphene oxide (GO) sheets by amide functional group and then Fe3O4 nanoparticles (NPs) are doped onto the functionalized GO surface. The AG/Fe3O4 nanocomposite showed efficient photocatalytic activity towards degradation of phenol (92.43%), 2-nitrophenol (2-NP) (98%) and 2-chlorophenol (2-CP) (97.15%) within 70–120 min. Consequently, in case of photo-Fenton degradation phenomenon, 93.56% phenol, 98.76% 2-NP and 98.06% of 2-CP degradation were achieved within 50–80 min using AG/Fe3O4 nanocomposite under sunlight irradiation. The synergistic effect between amide functionalized graphene and Fe3O4 nanoparticles (NPs) enhances the photocatalytic activity by preventing the recombination rate of electron-hole-pair in Fe3O4 NPs. Furthermore, the remarkable reusability of the AG/Fe3O4 nanocomposite was observed up to ten cycles during the photocatalytic degradation of these phenolic compounds.1 aBoruah, Purna, K.1 aSharma, Bhagyasmeeta1 aKarbhal, Indrapal1 aShelke, Manjusha, V.1 aDas, Manash, R. uhttps://library.ncl.res.in/content/ammonia-modified-graphene-sheets-decorated-magnetic-fe3o4-nanoparticles-photocatalytic-and02868nas a2200337 4500008004100000022001400041245018300055210006900238260000900307300001600316490000700332520173300339653002402072653001602096653001202112653001302124653002502137653001802162100002302180700002102203700001402224700001602238700002102254700001902275700002302294700002002317700002302337700002502360700002002385856012502405 2023 eng d a1944-824400aAtomically dispersed manganese on graphene nanosheets as biocompatible nanozyme for glutathione detection in liver tissue lysate using microfluidic paper-based analytical devices0 aAtomically dispersed manganese on graphene nanosheets as biocomp cOCT  a47902-479200 v153 a

Recently, single atom catalysts (SACs) featuring M-N-x (M = metal) active sites on carbon support have drawn considerable attention due to their promising enzyme-like catalytic properties. However, typical synthesis methods of SACs often involve energy-intensive carbonization processes. Herein, we report a facile one-pot, low-temperature, wet impregnation method to fully utilize M-N-4 sites of manganese phthalocyanine (MnPc) by decorating molecular MnPc over the sheets of graphene nanoplatelets (GNP). The synthesized MnPc@GNP exhibits remarkable peroxidase-mimic catalytic activity toward the oxidation of chromogenic 3,3 `,5,5(')-tetramethylbenzidine (TMB) substrate owing to the efficient utilization of atomically dispersed Mn and the high surface-to-volume ratio of the porous catalyst. A nanozyme-based colorimetric sensing probe is developed to detect important biomarker glutathione (GSH) within only 5 min in solution phase based on the ability of GSH to effectively inhibit the TMB oxidation. The high sensitivity and selectivity of the developed colorimetric assay enable us to quantitatively determine GSH concentration in different biological fluids. This work, for the first time, reports a rapid MnPc@GNP nanozyme-based colorimetric assay in the solid substrate by fabricating microfluidic paper-based analytical devices (mu PADs). GSH is successfully detected on the fabricated mu PADs coated with only 6.0 mu g of nanozyme containing 1.6 nmol of Mn in the linear range of 0.5-10 mu M with a limit of detection of 1.23 mu M. This work also demonstrates the quantitative detection of GSH in mice liver tissue lysate using mu PADs, which paves the way to develop mu PADs for point-of-care testing.

10acolorimetricsensing10aGlutathione10amu PADs10ananozyme10asingle atom catalyst10atissue lysate1 aBaruah, Diksha, J.1 aThakur, Ashutosh1 aRoy, Esha1 aRoy, Kallol1 aBasak, Sumanjita1 aNeog, Dipankar1 aBora, Himangsu, K.1 aKonwar, Rituraj1 aChaturvedi, Vikash1 aShelke, Manjusha, V.1 aDas, Manash, R. uhttps://library.ncl.res.in/content/atomically-dispersed-manganese-graphene-nanosheets-biocompatible-nanozyme-glutathione02780nas a2200361 4500008004100000022001400041245016100055210006900216260000900285300001600294490000700310520160800317653001501925653001701940653002201957653001301979653001401992653001102006100002102017700002102038700002202059700002102081700002202102700002202124700001902146700002302165700002102188700001802209700002302227700002502250700002002275856012302295 2024 eng d a1944-824400aHexagonal boron nitride quantum dots embedded on layer-by-layer films for peroxidase-assisted colorimetric detection of β-galactosidase producing pathogens0 aHexagonal boron nitride quantum dots embedded on layerbylayer fi cMAY  a26870-268850 v163 a

Pathogen detection has become a major research area all over the world for water quality surveillance and microbial risk assessment. Therefore, designing simple and sensitive detection kits plays a key role in envisaging and evaluating the risk of disease outbreaks and providing quality healthcare settings. Herein, we have designed a facile and low-cost colorimetric sensing strategy for the selective and sensitive determination of beta-galactosidase producing pathogens. The hexagonal boron nitride quantum dots (h-BN QDs) were established as a nanozyme that showed prominent peroxidase-like activity, which catalyzes 3,3 `,5,5 `-tetramethylbenzidine (TMB) oxidation by H2O2. The h-BN QDs were embedded on a layer-by-layer assembled agarose biopolymer. The beta-galactosidase enzyme partially degrades beta-1,4 glycosidic bonds of agarose polymer, resulting in accessibility of h-BN QDs on the solid surface. This assay can be conveniently conducted and analyzed by monitoring the blue color formation due to TMB oxidation within 30 min. The nanocomposite was stable for more than 90 days and was showing TMB oxidation after incubating it with Escherichia coli (E. coli). The limit of detection was calculated to be 1.8 x 10(6) and 1.5 x 10(6) CFU/mL for E. coli and Klebsiella pneumonia (K. pneumonia), respectively. Furthermore, this novel sensing approach is an attractive platform that was successfully applied to detect E. coli in spiked water samples and other food products with good accuracy, indicating its practical applicability for the detection of pathogens in real samples.

10abiopolymer10acolorimetric10ah-BN quantum dots10ananozyme10apathogens10aSensor1 aMajumdar, Sristi1 aGogoi, Devipriya1 aBoruah, Purna, K.1 aThakur, Ashutosh1 aSarmah, Priyakhee1 aGogoi, Parishmita1 aSarkar, Sanjib1 aPachani, Priyakshi1 aManna, Prasenjit1 aSaikia, Ratul1 aChaturvedi, Vikash1 aShelke, Manjusha, V.1 aDas, Manash, R. uhttps://library.ncl.res.in/content/hexagonal-boron-nitride-quantum-dots-embedded-layer-layer-films-peroxidase-assisted