Carbon supported CdSe nanocrystals

Insights to the mechanism of CdSe nanoparticle attachment to carbon nanotubes following the hot injection method are discussed. It was observed that the presence of water improves the nanotube coverage while Cl containing media are responsible for the shape transformation of the nanoparticles and further attachment to the carbon lattice. The experiments also show that the mechanism taking place involves the right balance of several factors, namely, low passivated nanoparticle surface, particles with well-defined crystallographic facets, and interaction with an organics-free sp2 carbon lattice. Furthermore, this procedure can be extended to cover graphene by quantum dots.Comment: 5 pages, 5 figure

Direct Passivation of Hydride-Terminated Silicon (100) Surfaces by Free-Radically Tethered Polymer Brushes

9232-923

Intragenic and Extragenic Suppression of a Mutation in Herpes Simplex Virus 1 UL34 That Affects both Nuclear Envelope Targeting and Membrane Budding ▿

Late in infection herpesviruses move DNA-filled capsids from the nucleus to the cytoplasm by enveloping DNA-containing capsids at the inner nuclear membrane (INM) and deenveloping them at the outer nuclear membrane. This process requires two conserved herpesvirus proteins, pUL31 and pUL34. Interaction between pUL34 and pUL31 is essential for targeting both proteins to the nuclear envelope (NE), and sequences that mediate the targeting interaction have been mapped in both proteins. Here, we show that a mutation in the INM-targeting domain of pUL34 fails to support production of infectious virus or plaque formation. The mutation results in multiple defects, including impaired interaction between pUL34 and pUL31, poor NE targeting of pUL34, and misregulated, capsid-independent budding of the NE. The mutant defects in virus production, plaque formation, and pUL31 interaction can be suppressed by other mutations in the INM-targeting domain of pUL31 and by additional mutations in the pUL34 coding sequence

Interfacing Quantum Dots and Graphitic Surfaces with Chlorine Atomic Ligands

The performance of devices based on semiconductor nanocrystals (NCs) improves both with stronger interface interactions among NCs and between NCs and solid electrode surfaces. The combination of X-ray photoelectron spectroscopy (XPS) and solid 31P CP/MAS NMR (cross-polarization/magic angle spinning nuclear magnetic resonance) shows that the selective substitution of long organic chains by chlorine atomic ligands during the colloidal synthesis by the hot injection method promotes the adsorption of CdSe NCs to carbon sp 2 surfaces, leading to the formation of well-ordered NC monolayers on graphitic materials. © 2013 American Chemical Society.B.H.J. thanks the European Commission for FP7-PEOPLE-ERG-2008 (239256), the former Spanish Ministry of Science and Innovation for RYC-2007-01709 and MAT-2009-13488. C.K. and M.M. acknowledge the Deutsche Forschungsgemeinschaft (DFG) for financial support. Financial support from the Ministerio de Ciencia e Innovación (FIS2010-18847, FIS2012-33011 and Consolider-Ingenio en Nanociencia Molecular, ref CSD200700010), Comunidad de Madrid (Grant S2009/MAT-1726) and EU (SMALL, PITN-GA-2009-23884) is gratefully acknowledged.Peer Reviewe