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Polymers and Their Composites for Wearable Electronics
Published in Inamuddin, Mohd Imran Ahamed, Rajender Boddula, Tariq Altalhi, Polymers in Energy Conversion and Storage, 2022
Svetlana Jovanović, Dragana Jovanović
Graphene nanoribbons are strips of graphene with a width below 50 nm (Celis et al. 2016, Bang et al. 2018). They show semiconducting properties due to quantum confinement and edge effects (Bang et al. 2018). The size of the energy bandgap is inversely proportional to the GNR width (Han et al. 2007). GNRs can be produced by top-down methods, such as longitudinal unzipping of nanotubes (Jovanović et al. 2014, Kosynkin et al. 2009), gamma rays cutting out graphene sheets (Marković et al. 2016, Tošić et al. 2012), and plasma etching on CNTs (Jiao et al. 2009); and bottom-up methods, such as chemical vapor deposition (Chen, Zhang, et al. 2016), epitaxy (Miettinen, Nevius, and Conrad 2019), and chemical synthetic approaches (Miettinen, Nevius, and Conrad 2019).
Synthesis of Graphene Nanosheets
Published in Ling Bing Kong, Carbon Nanomaterials Based on Graphene Nanosheets, 2017
Ling Bing Kong, Freddy Boey, Yizhong Huang, Zhichuan Jason Xu, Kun Zhou, Sean Li, Wenxiu Que, Hui Huang, Tianshu Zhang
The second method is a simple solution-based oxidative process, which can be used to produce nanoribbons with a nearly 100% yield, by lengthwise cutting and unzipping the side walls of multi-walled carbon nanotubes (MWCNTs) [225]. The derived nanoribbon exhibited high water solubility, which could be reduced chemically to restore the electrical conductivity of graphite. The graphene nanoribbons could be used in the fields of electronics and composite materials.
Photonic realization of the deformed Dirac equation via the segmented graphene nanoribbons under inhomogeneous strain
Published in Journal of Modern Optics, 2019
M. R. Setare, P. Majari, C. Noh, Sh. Dehdashti
Graphene is a single atomic layer of carbon arranged in a honeycomb lattice. Among the carbon nanostructures, graphene nanoribbons (GNRs) that are narrow strips of graphene have garnered great interest in recent years. As shown in Ref. (57) for narrow GNRs, we have the following 1D generalized Dirac equation: where is the position-dependent scalar Higgs field. Here we choose , in which case the equation becomes the usual 1D Dirac equation (58). The effects of nonisotropic strain on GNR can be summarized by the substitution in the above Hamiltonian (59):
Surface-enhanced Raman spectroscopy of hexabenzobenzene, C24H12, an analogue of a graphene nanostructure
Published in Molecular Physics, 2018
Because of its unique electronic properties, there has been much research on graphene, a two-dimensional (2D), one atom thick structure of carbon having the same arrangement of carbon atoms as in graphite [1,2]. The dependence of the electron band energies on the momentum K has been shown to be linear near K = 0 resulting in the conduction electrons having a zero effective mass meaning that they behave more like relativistic Fermions [3]. This means the conduction electrons move almost 1000 times faster than in silicon and thus graphene has a significant potential to improve electronic devices such as field-effect transistors. A single nanosized graphene ribbon has been synthesised by an electrophoeric deposition and heat treatment of diamond nanoparticles [4]. Subsequently, there have been other fabrications of graphene nanostructures on silicon surfaces [5,6]. Recently, field-effect transistors have been fabricated using graphene nanostructures [7,8]. However, large-scale synthesis of graphene nanoribbons which is needed for device applications remains a challenge.