01906nas a2200169 4500008004100000245015700041210006900198260000900267300001000276490000600286520124900292100001301541700002001554700001701574700002101591856012401612 2018 eng d00aFlexible and free-standing reduced graphene oxide thick films with PMMA stabilized silver nanoparticles, as a potential probe for cancer thermal therapy0 aFlexible and freestanding reduced graphene oxide thick films wit cOCT  a650320 v43 ahermal therapy is an efficient, cost-effective method for treating different types of cancers and hence flexible, light weight, biocompatible heating materials with low power consumption are of utmost importance. Partially reduced flexible, robust and bio-compatible thick graphene oxide films with, mostly edge functionalized Polymethyl methacrylate (PMMA) and in situ grown silver nanoparticles were prepared using simple soak and dry strategy. Larger distribution of silver nanoparticles with a mean diameter of 2.5 nm were anchored towards the edges of these thick films. The electrothermal (Joule heating) performance were found to increase in the presence of silver nanoparticles due to decrease in sheet resistance (0.33 × 104 Ωm) and increase in electron-phonon interaction. These free-standing, flexible films exhibited stable Joule heating behavior under repeated voltage on/off cycles. In-vitro studies performed on breast cancer cells in the presence of the prepared films, with an external applied voltage of 10 VDC, shows 67% cell death. This work proves the potentiality of thick heterogeneous (partially) reduced graphene oxide films towards site specific destruction of solid tumors by utilizing its Joule heating properties.1 aAsha, S.1 aAnanth, Nimrodh1 aJose, S., P.1 aRajan, M., A. J. uhttps://library.ncl.res.in/content/flexible-and-free-standing-reduced-graphene-oxide-thick-films-pmma-stabilized-silver01646nas a2200169 4500008004100000020002200041245010600063210006900169260014500238520087500383100002001258700001301278700002001291700002401311700001701335856012401352 2018 eng d a978-0-7354-1634-500aPolyethyleneglycol/silver functionalized Reduced graphene oxide aerogel for environmental application0 aPolyethyleneglycolsilver functionalized Reduced graphene oxide a a2 Huntington Quadrangle, Ste 1 No1, Melville, NY 11747-4501 USAbDept Atom Energy; Board Res Nucl Sci, Dept Atom Energy; Bhabha Atom Res Ctr3 a

Polyethylene glycol (PEG)/Silver (Ag) functionalized reduced graphene oxide aerogel (RGOA) was synthesized. PEG/Ag decorated reduced graphene oxide aerogel was characterized using XRD, Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR). The surface morphology of PEG/Ag/RGOA was analyzed using scanning electron microscope. The non-covalent interaction between reduced graphene oxide layers and the interaction between PEG and Ag on RGOA were studied by FT-IR spectra. It was observed that the interaction between Ag and PEG could enhance the properties of RGOA. Methyl Orange (MO) dye degradation was observed from UV-Vis Spectra. The process was studied by monitoring the simultaneous decrease in the height of UV-Vis absorption peak of dye solution. The results show that PEG/RGOA and PEG/Ag/RGOA are an efficient catalyst for dye degradation.

1 aKumari, Vanitha1 aAsha, S.1 aAnanth, Nimrodh1 aRajan, M., A. Jothi1 aMathavan, T. uhttps://library.ncl.res.in/content/polyethyleneglycolsilver-functionalized-reduced-graphene-oxide-aerogel-environmental01836nas a2200289 4500008004100000022001300041245012500054210006900179260000900248300001200257490000600269520088800275653002901163653001301192653001701205653002801222653002501250653001701275100001601292700001301308700001901321700002201340700001801362700001701380700002101397856012801418 2018 eng d a2053159100aSurface colonized silver nano particles over chitosan poly-electrolyte micro-spheres and their multi-functional behavior0 aSurface colonized silver nano particles over chitosan polyelectr cFEB  a 0250320 v53 ahitosan/tripolyphosphate polyelectrolyte (TPP) microspheres, decorated and surface functionalized with silver nanoparticles (NPs) of average diameter of 15 nm, were synthesized following a simple two-step procedure. These Ag NP-functionalized polyelectrolyte microspheres (Ag-CSPMs) are found to be biocompatible and enhancing the reactive oxygen species in curcumin with excellent anti-bacterial activity for selected Gram-positive and negative bacterial strains, making them much attractive relative to bare surface counterparts; the well-stabilized silver NPs do not form any agglomerations on the surface of the chitosan microspheres. They also show excellent cytotoxic behavior towards MCF7 cell lines, showing a half-maximal inhibitory concentration (IC50) of 32 μg ml-1. Therefore, Ag-CSPMs exhibit multi-functional ability having potential towards theranostics applications.10aantibacterial properties10aChitosan10aCytotoxicity10areactive oxygen species10asilver nanoparticles10atheranostics1 aPrakash, B.1 aAsha, S.1 aAnanth, A., N.1 aVanithakumari, G.1 aOkram, G., S.1 aJose, S., P.1 aRajan, M., A. J. uhttps://library.ncl.res.in/content/surface-colonized-silver-nano-particles-over-chitosan-poly-electrolyte-micro-spheres-and01581nas a2200193 4500008004100000022001300041245013500054210006900189260000900258490000900267520088300276100001301159700002001172700002001192700001801212700002001230700001701250856012001267 2018 eng d a0094243X00aTemperature dependent electron transport behavior of poly (methyl methacrylate)/silver functionalized reduced graphene oxide films0 aTemperature dependent electron transport behavior of poly methyl cAPR 0 v19423 a

Poly (methyl methacrylate) (PMMA) and silver functionalized reduced graphene oxide film were prepared and were investigated using FTIR and Raman. Electron transport behavior of these samples, at low temperature were studied. The prepared film exhibited a temperature dependent electron transport, at higher temperatures Arrhenius-like temperature dependence of resistance was observed indicating band like electron transport with a small thermal activation energy. At further lower temperatures hopping mechanism of conduction was observed due to the presence of defects. The conduction due to band-like electron transport at higher temperature is attributed to the easier excitation of charge carriers to the conduction band, whereas at lower temperatures conduction occurs through hopping mechanism due to localized states around Fermi level in the presence of defects.

1 aAsha, S.1 aAnanth, Nimrodh1 aKumari, Vanitha1 aOkram, G., S.1 aJose, Sujin, P.1 aRajan, Jothi uhttps://library.ncl.res.in/content/temperature-dependent-electron-transport-behavior-poly-methyl-methacrylatesilver02016nas a2200253 4500008004100000022001400041245019700055210006900252260000800321300001100329490000800340520110300348653001801451653001901469653001201488653000901500653002501509653001601534100001301550700002001563700002001583700003101603856012801634 2020 eng d a0921-510700aTemperature assisted reorganization of silver nanoparticles in free-standing, flexible chitosan functionalized reduced graphene oxide thick films: A potential SERS probe for folic acid sensing0 aTemperature assisted reorganization of silver nanoparticles in f cFEB a1144540 v2523 a

Chitosan and silver functionalized free standing reduced graphene oxide (rGO) films were prepared using simple soak and dry strategy. Redistribution of silver aggregates on chitosan functionalized rGO films were observed by thermally annealing these films at 450 degrees C, in an inert atmosphere. The re-organization / redistribution of silver aggregates in the rGO films were studied using in-situ Raman scattering signals. The redistribution of silver particles occurs through melting of micron sized silver aggregates during annealing. The rearrangement of the micro-sized silver aggregates to spherical silver nanoparticle on chitosan functionalized rGO film, as a result of temperature was assisted through factors such as graphene surface ripple rearrangement and the denaturation of rGO surface interacting chitosan chains. These free-standing films with redistributed silver nanoparticles showed excellent surface enhanced Raman scattering (SERS) effect with enhanced Raman signals for folic acid sensing, showcasing its potentiality to be utilized as flexible SERS based sensors.

10aFree-standing10agraphene oxide10asensing10aSERS10asilver nanoparticles10aThick-films1 aAsha, S.1 aAnanth, Nimrodh1 aJose, Sujin, P.1 aRajan, Michael, Anjello Jo uhttps://library.ncl.res.in/content/temperature-assisted-reorganization-silver-nanoparticles-free-standing-flexible-chitosan