@article { ISI:000286860900003, title = {Synthesis of silver nanoparticles in an aqueous suspension of graphene oxide sheets and its antimicrobial activity}, journal = {Colloids and Surfaces B-Biointerfaces}, volume = {83}, number = {1}, year = {2011}, month = {MAR}, pages = {16-22}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

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.

}, keywords = {Antimicrobial activity, Escherichia coli, graphene oxide, Pseudomonous aeruginosa, Silver nanoparticle}, issn = {0927-7765}, doi = {10.1016/j.colsurfb.2010.10.033}, author = {Das, Manash R. and Sarma, Rupak K. and Saikia, Ratul and Kale, Vinayak S. and Shelke, Manjusha V. and Sengupta, Pinaki} } @article { ISI:000322587800006, title = {High efficiency electron field emission from protruded graphene oxide nanosheets supported on sharp silicon nanowires}, journal = {Journal of Materials Chemistry C}, volume = {1}, number = {33}, year = {2013}, month = {JUN}, pages = {5040-5046}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

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.

}, issn = {2050-7526}, doi = {10.1039/c3tc30904e}, author = {Devarapalli, Rami Reddy and Kashid, Ranjit V. and Deshmukh, Ashvini B. and Sharma, Ponchami and Das, Manash R. and More, Mahendra A. and Shelke, Manjusha V.} } @article { ISI:000314381700030, title = {One-pot synthesis of gold nanoparticle/molybdenum cluster/graphene oxide nanocomposite and its photocatalytic activity}, journal = {Applied Catalysis B-Environmental}, volume = {130}, year = {2013}, month = {FEB}, pages = {270-276}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

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.

}, keywords = {gold nanoparticles, graphene oxide, Nanohybrid, Photodegradation, Rhodamine B, visible light, [Mo6Br8(N-3)(6)](2-)cluster}, issn = {0926-3373}, doi = {10.1016/j.apcatb.2012.11.017}, author = {Barras, Alexandre and Das, Manash R. and Devarapalli, Rami Reddy and Shelke, Manjusha V. and Cordier, Stephane and Szunerits, Sabine and Boukherroub, Rabah} } @article { ISI:000358512200094, title = {Green 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 reaction}, journal = {New Journal of Chemistry}, volume = {39}, number = {8}, year = {2015}, month = {JUN}, pages = {6631-6641}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

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.

}, issn = {1144-0546}, doi = {10.1039/c5nj01221j}, author = {Hussain, Najrul and Borah, Ashwini and Darabdhara, Gitashree and Gogoi, Pranjal and Azhagan, Muniraj Vedi Kuyil and Shelke, Manjusha V. and Das, Manash R.} } @article { ISI:000348937900068, title = {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}, journal = {Catalysis Science \& Technology}, volume = {5}, number = {2}, year = {2015}, month = {NOV}, pages = {1251-1260}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

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.

}, issn = {2044-4753}, doi = {10.1039/c4cy01229a}, author = {Hussain, Najrul and Gogoi, Pranjal and Azhagan, Muniraj Vedi Kuyil and Shelke, Manjusha V. and Das, Manash R.} } @article { ISI:000371177100032, title = {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 (vol 5, pg 1251, 2015)}, journal = {Catalysis Science \& Technology}, volume = {6}, number = {4}, year = {2016}, month = {FEB}, pages = {1234-1234}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Correction for {\textquoteleft}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{\textquoteright} by Najrul Hussain et al., Catal. Sci. Technol., 2015, 5, 1251{\textendash}1260.

}, issn = {2044-4753}, doi = {10.1039/c6cy90017h}, author = {Hussain, Najrul and Gogoi, Pranjal and Azhagan, Muniraj Vedi Kuyil and Shelke, Manjusha V. and Das, Manash R.} } @article { ISI:000369537900099, title = {Sunlight assisted degradation of dye molecules and reduction of toxic Cr(VI) in aqueous medium using magnetically recoverable Fe3O4/reduced graphene oxide nanocomposite}, journal = {RSC Advances}, volume = {6}, number = {13}, year = {2016}, month = {JAN}, pages = {11049-11063}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

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.

}, issn = {2046-2069}, doi = {10.1039/c5ra25035h}, author = {Boruah, Purna K. and Borthakur, Priyakshree and Darabdhara, Gitashree and Kamaja, Chaitanya Krishna and Karbhal, Indrapal and Shelke, Manjusha V. and Phukan, Pallabi and Saikia, Dulen and Das, Manash R.} } @article {44018, title = {Ammonia-modified graphene sheets decorated with magnetic Fe3O4 nanoparticles for the photocatalytic and photo-Fenton degradation of phenolic compounds under sunlight irradiation}, journal = {Journal of hazardous materials }, volume = {325}, year = {2017}, month = {NOV}, type = {Article}, abstract = {Synthesis 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{\textendash}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{\textendash}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.}, doi = {10.1016/j.jhazmat.2016.11.023}, author = {Boruah, Purna K. and Sharma, Bhagyasmeeta and Karbhal, Indrapal and Shelke, Manjusha V. and Das, Manash R.} } @article {48766, title = {Atomically dispersed manganese on graphene nanosheets as biocompatible nanozyme for glutathione detection in liver tissue lysate using microfluidic paper-based analytical devices}, journal = {ACS Applied Materials \& Interfaces}, volume = {15}, year = {2023}, month = {OCT }, pages = {47902-47920}, type = {Article}, abstract = {

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 {\textquoteleft},5,5({\textquoteright})-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.

}, keywords = {colorimetricsensing, Glutathione, mu PADs, nanozyme, single atom catalyst, tissue lysate}, issn = {1944-8244}, doi = {10.1021/acsami.3c08762}, author = {Baruah, Diksha J. and Thakur, Ashutosh and Roy, Esha and Roy, Kallol and Basak, Sumanjita and Neog, Dipankar and Bora, Himangsu K. and Konwar, Rituraj and Chaturvedi, Vikash and Shelke, Manjusha V. and Das, Manash R.} }