We report that nanoscale carbon particles (carbon dots) upon simple surface passivation are strongly photoluminescent in both solution and the solid state. The luminescence emission of dots is stable against photobleaching, there no blinking effect. These emissive may find applications similar to or beyond those their widely pursued silicon counterparts.

Bioapplications of carbon nanotubes have been predicted and explored ever since the discovery these one-dimensional allotropes. Indeed, many interesting unique properties potentially useful in a variety biological biomedical systems devices. Significant progress has made effort to overcome some fundamental technical barriers toward bioapplications, especially on issues concerning aqueous solubility biocompatibility design fabrication prototype biosensors. In this article we take...

Quantum dots (QDs) generally refer to nanoscale particles of conventional semiconductors that are subject the quantum-confinement effect, though other nanomaterials similar optical and redox properties also named as QDs even in absence strictly defined quantum confinement. Among such have attracted tremendous recent interest carbon dots, which small nanoparticles with some form surface passivation, graphene various configurations. In this article, we highlight these carbon-based by focusing...

There have been multiple conflicting reports about the biocompatibility and antimicrobial activity of graphene oxide. To address this, we conducted a study to characterize properties oxide (GO) its with mammalian cells. When GO was added bacterial culture at 25 μg/mL, results showed that bacteria grew faster higher optical density than cultures without GO. Scanning electron microscopy indicated formed dense biofilms in presence This shown by large mass aggregated cells extracellular...

Increasing atmospheric CO(2) levels have generated much concern, driving the ongoing carbon sequestration effort. A compelling option is its photocatalytic conversion to hydrocarbons, for which use of solar irradiation represents an ultimate solution. Here we report a new strategy using surface-functionalized small nanoparticles harvest visible photons subsequent charge separation on particle surface in order drive efficient process. The aqueous solubility catalysts enables photoreduction...

Single-walled and multiple-walled carbon nanotubes were functionalized with poly(vinyl alcohol) (PVA) in esterification reactions. Similar to the parent PVA, nanotube samples are soluble highly polar solvents such as DMSO water. The common solubilities have allowed intimate mixing of matrix polymer for wet-casting nanocomposite thin films. PVA−carbon composite films high optical quality, without any observable phase separation, well-dispersed solution. functionalization by is apparently an...

A derivatized porphyrin with long alkyl chains, 5,10,15,20-tetrakis(hexadecyloxyphenyl)-21H,23H-porphine, is selective toward semiconducting single-walled carbon nanotubes (SWNTs) in presumably noncovalent interactions, resulting significantly enriched SWNTs the solubilized sample and predominantly metallic residual solid according to Raman, near-IR absorption, bulk conductivity characterizations.

A successful attempt in the functionalization and solubilization of boron nitride nanotubes is reported, a mechanism based on interactions amino functional groups with nanotube surface borons proposed.

The impurity-free aqueous dispersions of boron nitride nanosheets (BNNS) allowed the facile preparation silver (Ag) nanoparticle-decorated BNNS by chemical reduction an Ag salt with hydrazine in presence BNNS. resultant Ag-BNNS nanohybrids remained dispersed water, allowing convenient subsequent solution processing. By using substrate transfer techniques, nanohybrid thin film coatings on quartz substrates were prepared and evaluated as reusable surface enhanced Raman spectroscopy (SERS)...

Stealth nanotubes: The stealth character of covalently PEGylated single-walled nanotubes (SWNTs, indicated by arrows in image) vivo is studied. exhibit much longer blood-circulation half-life than the previous record for and also a low hepatic uptake, vital to uses drug-delivery systems. benefits are reflected observed high tumor uptake SWNTs.

Carbon nanotubes (CNTs) have been shown to cross cell membranes and can mediate the internalization of macromolecules. These characteristics constituted CNTs as an exciting new tool for drug delivery biological sensing. While exhibit great potential in biomedical pharmaceutical applications, neither penetration mechanism nor intracellular fate internalized are fully understood. In this study, time-lapse fluorescence microscopy was used investigate distribution FITC labeled PEGylated...

This article reports an unambiguous demonstration that bulk-separated metallic single-walled carbon nanotubes offer superior performance (consistently and substantially better than the as-produced nanotube sample) in conductive composites with poly(3-hexylthiophene) also transparent coatings based on PEDOT:PSS. The results serve as a validation widely held view are competitive various technologies currently dominated by inorganic materials (such indium tin oxide).

Carbon "quantum" dots (CDots), generally defined as small carbon nanoparticles with various surface passivation schemes, have emerged to represent a rapidly advancing and expanding research field. CDots are known for their bright colorful fluorescence emissions, where the colorfulness is associated emissions being excitation wavelength dependent. In this work, 2,2′-(ethylenedioxy)bis(ethylamine) (EDA) functionalization were studied systematically by using steady-state time-resolved methods....

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHigh Aqueous Solubility of Functionalized Single-Walled Carbon NanotubesK. A. Shiral Fernando, Yi Lin, and Ya-Ping SunView Author Information Department Chemistry, Howard L. Hunter Laboratory, Clemson University, Clemson, South Carolina 29634-0973 Cite this: Langmuir 2004, 20, 11, 4777–4778Publication Date (Web):April 24, 2004Publication History Received25 November 2003Revised18 March 2004Published online24 April inissue 1 May...

The carbon dots in this study were small nanoparticles with the particle surface functionalized by oligomeric poly(ethylene glycol) diamine molecules. Upon photoexcitation, brightly fluorescent aqueous solution served function of excellent electron donors to reduce platinum(IV) and gold(III) compounds into their corresponding metals be deposited on dot surface. even very amounts found have dramatic quenching effects fluorescence emission intensities, but essentially no observed decays....

Fluorescence intensities of carbon dots are substantially enhanced in the confined environment polymeric films.

Carbon "quantum" dots (or carbon dots) have emerged as a new class of optical nanomaterials. Beyond the widely reported bright fluorescence emissions in dots, their excellent photoinduced redox properties that resemble those found conventional semiconductor nanostructures are equally valuable, with photon-electron conversion applications from photovoltaics to CO2 photocatalytic reduction. In this work we used gold-doped controlled synthesis water-soluble catalysts for closer examination...

Small carbon nanoparticles were functionalized by low-molecular weight amino compound 3-ethoxypropylamine (EPA) for ultracompact dots of bright fluorescence emissions. The results from solution-phase NMR characterization support the expected dot structure surface-attached with EPA species. optical properties EPA-carbon share many features those found in other surface functionalities, but there is an extra absorption shoulder blue spectral region, into which excitation much enhanced green...

The near-IR absorption spectrum of semiconducting single-walled carbon nanotubes is characterized by the transitions associated with first (S11) and second (S22) pairs van Hove singularities in electronic density states. We report that a significant effect on can be caused non-covalent complexation nanotube planar aromatic molecules such as pyrenes solution, resulting absence S11 S22 bands spectrum. Since reversible, characteristic turned off reversible fashion.

Using sonochemistry to provide the thermal energy and mixing, we demonstrate ability synthesize air-stable aluminum nanoparticles of two different size distributions from titanium-catalyzed decomposition alane. Characterization data indicate presence spherical face-centered-cubic with average sizes either 5 or 30 nm that are capped an organic shell. The correlates concentration passivation agent oleic acid, where a higher results in smaller particles. Thermal analysis demonstrates at...

Quantum dots (QDs), generally referring to semiconductor nanocrystals that display the quantum confinement effect, have been widely pursued for many energy conversion applications. More recently, carbon (CDots), which are small nanoparticles with various surface passivation schemes, found possess optical properties and photoinduced redox characteristics resembling those of conventional QDs thus amenable some same uses in conversions. Among nanomaterials, fullerenes extensively investigated...

Organically capped metal nanoparticles are an attractive alternative to more conventional oxide-passivated materials, due the lower reaction temperatures and possibility of tuning organic coating. Sonochemical methods have been used produce small (∼5 nm average size) air-stable aluminum with oleic acid. In order understand nature metal−organic bonding in nanoparticles, we FTIR, XPS, TOFMS−TPD techniques study passivation layer its desorption at elevated temperatures. present case find that...

The detection of nanotube carbons in solution by 13C NMR is reported. highly soluble sample was from the functionalization 13C-enriched single-walled carbon nanotubes (SWNTs) with diamine-terminated oligomeric poly(ethylene glycol) (PEG1500N). ferromagnetic impurities due to residual metal catalysts were removed via repeated magnetic separation. signals are broad but partially resolved into two overlapping peaks, which tentatively assigned on semiconducting (upfield) and metallic (downfield)...