Graphene quantum dots

Ebook "Novel optical nanoprobes for chemical and biological analysis" starts with a brief introduction to several kinds of versatile nanomaterials with novel optical properties, such as gold/silver nanoparticles, quantum dots, upconversion nanoparticles and graphene. It mainly focuses on the latest sensor design strategies, which apply the optical properties of nanomaterials to various detection techniques including colorimetry, fluorescence, and surface-enhanced Raman scattering (SERS).

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Part 1 book "The physics of graphene" includes content: The electronic structure of ideal graphene, electron states in a magnetic field, quantum transport via evanescent waves, the klein paradox and chiral tunneling; edges, nanoribbons, and quantum dots.

590p oursky03 21-08-2023 7 3   Download

Graphene Quantum Dots (GQDs) were successfully synthesized by a green and ecofriendly synthetic method using abundant and naturally available raw materials from rice flour. To the best of our knowledge, there have been no published reports concerning the comparison of the ability to synthesize GQDs and the properties of GQDs produced by these two methods.

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This work carries out the study and fabrication of TiO2/Graphene Quantum Dots (GQDs) nanocomposite thin films to be applicated as an electronic collection material layer in nanostructured solar cells. The different concentrations of added GQDs by the spreading method were loaded on TiO2/GQDs nanocomposite films.

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Graphene Quantum Dots (GQDs) are a type of material with a width of several nanometers (nm) and a thickness of a single layer or a few layers of carbon (C) atoms organized in hexagonal shape like a beehive. Since the lattice structure of GQDs only includes carbon atoms, they are a nanomaterial that is friendly to the environment and humans. They have many applications, with one of the main uses being a novel antimicrobial agent.

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The aim of this thesis is to study electrical transport characteristics of graphene nanostructures. We focus on two research objects associated with two kinds of graphene nanostructures: graphene bipolar junctions (GBJs) and graphene quantum dots (GQDs).

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The aim of this thesis is to study electrical transport characteristics of graphene nanostructures. We focus on two research objects associated with two kinds of graphene nanostructures: graphene bipolar junctions (GBJs) and graphene quantum dots (GQDs).

27p capheviahe26 25-01-2021 18 3   Download

In this work, we have developed a simple method for preparation of silver nanoparticles/graphene quantum dots hybrid (AgNPs/GQDs) using graphene quantum dots (GQDs) as reducing reagent and stabilizer. The synthesized GQDs and AgNPs/GQDs hybrid have been characterized by ultraviolet–visible spectroscopy (UV-Vis), photoluminescence (PL), X-ray diffraction (XRD) and transmission electron microscopy (TEM).

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We study how the trapping time of an electron in a circular graphene quantum dot depends on the electron’s angular momentum and on the parameters of the external Gaussian potential used to induce the dot. The trapping times are calculated through a numerical determination of the quasi-bound states of electron from the two-dimensional Dirac-Weyl equation. It is shown that on increasing the angular momentum, not only the trapping time decreases but also the trend of how the trapping time depends on the effective radius of the dot changes.

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Graphene quantum dots (GQDs) were synthesized and incorporated with polyethylene dioxythiophene:poly(4-styrenesulfonate (PEDOT:PSS), Ag nanowires (AgNWs) to form a composite that can be used for enhancement of relative humidity (RH%) sensing. The composite films contained bulk heterojunctions of AgNW/GQD and AgNW/PEDOT:PSS. The sensors made from the composites responded well to relative humidity in a range from 10% to 50% at room temperature.

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This book collects some new progresses on research of graphene from theoretical and experimental aspects in a variety of topics, such as graphene nanoribbons, graphene quantum dots, and graphene-based resistive switching memory. The authors of each chapter give a unique insight about the specific intense research area of graphene. This book is suitable for graduate students and researchers with background in physics, chemistry, and materials as reference.

268p haiduong_1 15-04-2013 97 29   Download

Güttinger et al. Nanoscale Research Letters 2011, 6:253 http://www.nanoscalereslett.com/content/6/1/253 NANO EXPRESS Open Access Transport through a strongly coupled graphene quantum dot in perpendicular magnetic field Johannes Güttinger1*, Christoph Stampfer1,2, Tobias Frey1, Thomas Ihn1 and Klaus Ensslin1 Abstract We present transport measurements on a strongly coupled graphene quantum dot in a perpendicular magnetic field.

6p dauphong13 09-02-2012 42 6   Download