01897nas 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<p>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.</p>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-002780nas 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<p>
	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.</p>
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