We report the characterization of electronic shell filling in metallic single-walled carbon nanotubes by low-temperature transport measurements. Nanotube quantum dots with average conductance approximately (1-2)e(2)/h exhibit a distinct four-electron periodicity for electron addition as well as signatures of Kondo and inelastic cotunneling. The Hartree-Fock parameters that govern the electronic...

Graphitic carbon nitride (g-C3N4) quantum dots (CNQDs) were prepared from bulk g-C3N4 directly by a thermal-chemical etching process. The CNQDs show strong blue emission as well as upconversion behavior, which can be used as universal energy-transfer components in visible-light-driven metal-free photocatalytic systems.

The electron spin is a very promising candidate for a solid-state qubit [1]. Major experimental breakthroughs have been achieved in recent years using quantum dots formed in semiconductor heterostructures based on GaAs technology [2, 3, 4, 5]. In such devices, the major sources of spin decoherence have been identified as the spin-orbit interaction, coupling the spin to lattice vibrations [6, 7,...

New bacterial detection and imaging methods are desirable for diagnostics and healthcare applications, as well as in basic scientific research. We present a simple analytical platform for bacterial detection and imaging based upon attachment of amphiphilic carbon dots (CDs) to bacterial cells. We show that CDs functionalized with hydrocarbon chains readily bind to bacterial cells following shor...

Carbon dots (CDs) have been widely studied since their discovery in 2004 as a green substitute of the traditional quantum dots due to their excellent photoluminescence (PL) and high biocompatibility. Meanwhile, polymers have increasingly become an important component for both synthesis and modification of CDs to provide polymeric matrix and enhance their PL property. Furthermore, critical analy...

Multifunctional nanoplatforms based onmesoporous silica nanoparticles (MSNs) have recently shown great promise in drug delivery and therapy. Herein, a multifunctional nanoplatform based on MSNs is fabricated by a modified micro-emulsion method for drug delivery and imaging-guided chemo/photodynamic synergistic therapy. Carbon dots (C-dots) and a photosensitizer, rose bengal (RB), are embedded i...

We describe the first enzyme-driven technique for fluorescent labeling of single-walled carbon nanotubes (SWNTs). The labeling was performed via enzymatic biotinylation of nanotubes in the tyramide-horseradish peroxidase (HRP) reaction. Both direct and indirect fuorescent labeling of SWNTs was achieved using either biotinyl tyramide or fluorescently tagged tyramides. Biotinylated SWNTs later re...

Doping of low-dimensional graphitic materials, including graphene, graphene quantum dots and single-wall carbon nanotubes with nitrogen, sulfur or boron can significantly change their properties. We report that simple fluorination followed by annealing in a dopant source can superdope low-dimensional graphitic materials with a high level of N, S or B. The superdoping results in the following do...

In this work, carbon quantum dots (CQDs) have been synthesized by one step hydrothermal method to detect hydrogen peroxide (H2O2). The optical H2O2 sensors were based on the fluorescent quenching of the carbon quantum dots. The optical H2O2 sensors demonstrate capable of detecting H2O2 over the range of 0-88.2 mM and 0-60 mM. The H2O2 sensitivities of wavelength shift to changes in the H2O2 con...