![]() ![]() We demonstrate that both PNA and DNA probe-modified G-FET have great potential in quantitative detection of RNA. The limit of detection (LOD) of the PNA probe-modified G-FET sensor is down to 0.1 aM, which is three orders of magnitude lower than that of DNA probe-modified G-FET sensor. In this paper, we report the ultrasensitive detection for RNA by graphene field effect transistor (G-FET) biosensor using PNA and DNA probes. However, the DNA probe-based sensors suffer from many problems, such as long hybridization time, background electrical noise, and relatively poor specificity. The limitations and future developments of electrospinning and graphene-based electrospun nanofibres that can be made are also presented.ĭNA probe-based biosensors have been widely developed for detecting a range of analytes. The historical overview and fundamentals of electrospinning, graphene and its properties as nanofiller as well as the applications of graphene-based electrospun nanofibres in different fields are discussed. This chapter aims to describe an overview of progress of graphene-based electrospun nanofibres and their applications in various fields including biomedical, chemical, defence and environmental applications. The graphene-based polymeric nanofibres have opened new opportunities for diverse applications of nanofibres in different walks of life. These desirable properties make graphene a superior material than CNTs and other conducting nanoparticles. Among these nanofillers, graphene has gained extensive interest for researchers, as a multifunctional molecule associating different unique properties like high mechanical strength, electrical conductivity, flexibility, conductivity and optical transparency. Scientists have incorporated various nanomaterials as nanofillers in the polymeric matrix to enhance the properties of nanofibres according to their specific applications. With increasing demand of nanotechnology, electrospinning has gained more attention due to its versatile application in various fields. The PANi/G-PBASE nanofibers exhibited electrical conductivity as high as of 30.25 S/cm which was 3 times higher than that of neat PANi nanofibers.Įlectrospinning has emerged as a versatile and promising technique to synthesize nanofibres. The electrical conductivity of the fibers at room temperature were investigated by fourpoint probe method. The core–shell structure and the existence of graphene sheets in the core layer were confirmed by TEM images and FTIR spectroscopy obtained before and after solvent etching of PMMA. The morphology of the nanofibers was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Moreover, neat PANi/G-PBASE and PANi nanofibers were obtained by solvent etching of PMMA shell, which reduced the fiber diameter to 230 nm. The as-prepared PANi/G-PBASE/PMMA nanofibers possessed diameters in the range of 420 nm. PANi/G-PBASE and PMMA solutions were used as core and shell layer respectively. By adjusting the sample thicknesses, the effective bandwidth (the bandwidth of RC values lower than −10 dB) amounts 9.5 GHz (from 2.5 to 12.0 GHz), covering the whole C and X bands.Core–shell structured Polyaniline/Poly(methyl methacrylate) (PANi/PMMA) nanofibers embedded with 1-pyrenebutanoic acid, succinimidyl ester functionalized graphene (G-PBASE) is produced using coaxial electrospinning. With a sample thickness of 4.5 mm, the minimum reflection coefficient (RC) of the composites Fe 3O 4/SiO 2 mixed with paraffin wax reaches −44.7 dB, indicating that more than 99.99% EM waves can be attenuated by the composites. And the unique core-shell structure with the hetero-interface combined with simultaneous dielectric and magnetic loss endow Fe 3O 4/SiO 2 nanoparticles outstanding electromagnetic (EM) wave absorbing performance. The results show that the size of obtained Fe 3O 4/SiO 2 nanoparticles is in the range of 2-200 nm. Elemental analysis, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscope, vibrating sample magnetometer and vector network analyzer were employed to investigate the composition, nano/microstructure, morphology, and dielectric/magnetic properties. In this work, novel core-shell structured Fe 3O 4/SiO 2 nanoparticles were fabricated via a polymer-derived ceramic approach, starting from sol-like polycarbosilane-encapsulated polynuclear carbonyl iron nanoparticles and with pitch as an isolator to avoid aggregation during polymer-to-ceramic transformation. ![]()
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