Graphene nanohybrids for enhanced catalytic activity and large surface area
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Prospective Article
Graphene nanohybrids for enhanced catalytic activity and large surface area Sabeen Fatima, Department of Physics, School of Natural Sciences (SNS), National University of Science & Technology (NUST), Islamabad 44000, Pakistan S. Irfan Ali, Shenzhen Key Laboratory of Advanced Thin Films and Applications, College of Physics and Energy, Shenzhen University, Shenzhen 518060, China Daniyal Younas, Department of Physics, School of Natural Sciences (SNS), National University of Science & Technology (NUST), Islamabad 44000, Pakistan Amjad Islam, College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou-350002, China Deji Akinwande, Microelectronics Research Center, University of Texas at Austin, Texas 78758, USA Syed Rizwan, Department of Physics, School of Natural Sciences (SNS), National University of Science & Technology (NUST), Islamabad 44000, Pakistan Address all correspondence to Syed Rizwan at [email protected] (Received 31 May 2018; accepted 5 September 2018)
Abstract Nanohybrids containing graphene and bismuth ferrite have been actively employed as efficient photo-catalysts these days owing to the low rate of charge carrier’s (e−–h+) recombination, moderate surface area with a suitable range of band-gaps. We have synthesized nanohybrids of graphene oxide (GO) and doped BiFeO3 using a co-precipitation method and the doping elements were lanthanum and manganese, hence called BLFMO/GO nanohybrids. The surface area of BLFMO [La = 15% increased from 6.8 m2/g (for pure) to 62.68 m2/g (in nanohybrid)]. Also, the bandgap of the BLFMO/GO nanohybrid reduced significantly up to 1.75 eV. The resulting BLFMO/GO nanohybrid represents significantly higher catalytic activity (96% in 30 min) than the pure BiFeO3 (30% in 30 min).
Introduction Ferrites belong to a large class of metal oxides and have been a center of extensive study because of the simultaneous presence of electrical with magnetic properties inside the same material. Due to the low cost, shape versatility, wide frequency range (10–50 kHz), temperature and time stability, high resistivity, economical assembly, and large selection material, ferrites have an edge over other magnetic materials.[1] At the nanoscale, ferrites show unique properties which are very much distinct from their identical parts present inside bulk. The change in properties of ferrite nanoparticles is due to significant structural changes, joint rearrangements of electrons because of the reduced dimensionality and the surface atoms dominance.[2–4] In all these years, enough work has been done over ferrite nanoparticles with quite attractive industrial and scientific applications like rotary transformers, telecommunication, magnetic memory cores, magnetic recording heads, and electrical appliances.[5] Multiferroics are scientifically as well as technologically fascinating materials because of the cross coupling between their ferroic order states within a single material. Bismuth ferrite (BiFeO3), abbreviated as BFO, perhaps is an alone perovskite str
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