The advancement of optical technology demands the development of chiral nanostructures with a strong dissymmetry of optical response. Here, we comprehensively analyze the chiral optical properties of circular twisted graphene nanostrips, with a particular emphasis on the case of a Möbius graphene nanostrip. We use the method of coordinate transformation to analytically model the electronic structure and optical spectra of the nanostrips, while employing the cyclic boundary conditions to account for their topology. It is found that the dissymmetry factors of twisted graphene nanostrips can reach 0.01, exceeding the typical dissymmetry factors of small chiral molecules by 1-2 orders of magnitude. The results of this work thus demonstrate that twisted graphene nanostrips of Möbius and similar geometries are highly promising nanostructures for chiral optical applications.
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http://dx.doi.org/10.1021/acs.jpclett.3c00925 | DOI Listing |
RSC Adv
April 2024
Department of Physics, S.N. Arts, D.J.M. Commerce and B.N.S. Science College (Autonomous) Sangamner Ahmednagar 422 605 M.S. India
The study presents a novel, one-pot, and scalable solid-state reaction scheme to prepare bismuth sulphide (BiS)-reduced graphene oxide (rGO) nanocomposites using bismuth oxide (BiO), thiourea (TU), and graphene oxide (GO) as starting materials for energy storage applications. The impact of GO loading concentration on the electrochemical performance of the nanocomposites was investigated. The reaction follows a diffusion substitution pathway, gradually transforming BiO powder into BiS nanostrips, concurrently converting GO into rGO.
View Article and Find Full Text PDFJ Phys Chem Lett
May 2023
Department of Materials and The Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, London SW7 2AZ, United Kingdom.
Nanomaterials (Basel)
February 2023
School of Physics and Electronics, Central South University, Changsha 410083, China.
The integrated structure of graphene single-electron transistor and nanostrip electrometer was prepared using the semiconductor fabrication process. Through the electrical performance test of the large sample number, qualified devices were selected from low-yield samples, which exhibited an obvious Coulomb blockade effect. The results show that the device can deplete the electrons in the quantum dot structure at low temperatures, thus, accurately controlling the number of electrons captured by the quantum dot.
View Article and Find Full Text PDFJ Opt Soc Am A Opt Image Sci Vis
October 2022
This work presents the existence of the mode conversion technique in a graphene-based Yagi-Uda array antenna. It comprises four arrays whose strands are placed on a silicon dioxide substrate, and are eventually connected with the graphene ring. All four driven elements of the Yagi-Uda array antenna are excited through the 50 silver nanostrip feedline.
View Article and Find Full Text PDFNanomaterials (Basel)
July 2022
Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e i Microsistemi (CNR-IMM), Università degli Studi di Catania, Via S. Sofia 64, 95123 Catania, Italy.
Energy storage devices based on earth-abundant materials are key steps towards portable and sustainable technologies used in daily life. Pseudocapacitive devices, combining high power and high energy density features, are widely required, and transition metal oxides represent promising building materials owing to their excellent stability, abundance, and ease of synthesis. Here, we report an original ZnO-based nanostructure, named nanostars (NSs), obtained at high yields by chemical bath deposition (CBD) and applied as pseudocapacitors.
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