Kai-Ming G. Fu,1,2 Taylor A. Johnston,1,2 Ankoor S. Shah,1,2 Lori Arnold,3 John Smiley,2 Troy A. Hackett,4 Preston E. Garraghty,3 and Charles E. Schroeder1,2 1Albert Einstein College of Medicine, Bronx, New York 10461, 2Nathan Kline Institute, Orangeburg, New York 10962, 3Department of Psychology, Program in Neural Science, Indiana University, Bloomington, Indiana 47405, and 4Vanderbilt Univers...

Herein we report a simple and green synthesis of smart Au and Ag@Au nanocomposite particles using poly(N-isopropylacrylamide)/polyethyleneimine (PNIPAm/PEI) core-shell microgels as dual reductant and templates in an aqueous system. The nanocomposite particles were synthesized through a spontaneous reduction of tetrachloroauric (III) acid to gold nanoparticles at room temperature, and in situ en...

Synthesis of nanoparticle dimers made of asymmetric compositions is very challenging because of the difficulty in manipulating the nanoparticles' surface chemistries in order to control the assembly and/or growth of different nanoparticles. In this Letter, we report a seed-mediated, surface-confined epitaxial overgrowth strategy that enables the synthesis of high-quality interfaced Au-Ag hetero...

Metal nanoparticles (NPs) are of great interest due to their special optical, [ 1–3 ] electronic, [ 4–8 ] and catalytic [ 9,10 ] properties. [ 11 ] Among metal NPs, Au NPs have been investigated most extensively because of their facile preparation, resistance to oxidation, and surface plasmon resonance (SPR) band that can absorb and scatter visible light. [ 3 ] Core/ shell and alloy bimetallic ...

Using a two-step seed-mediated growth method, we synthesized bimetallic nanoparticles (NPs) having a gold octahedron core and a palladium epitaxial shell with controlled Pd-shell thickness. The mismatch-release mechanism between the Au core and Pd shell of the NPs was systematically investigated by high-resolution transmission electron microscopy. In the NPs coated with a single atomic layer of...

DEAR LADIES AND GENTLEMEN OF THE American Science Community: As I write this from my troubled home state of Kansas, the State Board of Education is debating once again whether to de-emphasize the theory of evolution. Those in the majority on the Board have stated that they are considering changing the very definition of science to allow for science classes to discuss the merits of intelligent d...

Planets that form beyond the snow line with too little mass to seed rapid gas accretion (. 10 M⊕) should be rich in volatile ices like H2O and NH3. Some of these planets should migrate inward by interacting with a circumstellar disk or with other planets. Such objects can retain their volatiles for billions of years or longer at ∼ 1 AU as their atmospheres undergo slow hydrodynamic escape. Thes...

We demonstrate that the shape of PbSe nanocrystals can be controlled systematically by seeding their growth with noble metal nanoparticles (Au, Ag, or Pd) and varying the seed and precursor concentrations. Cylinders (quantum rods), cubes, crosses, stars, and branched structures were produced in high yield at 150 degrees C in reaction times of a few minutes. Although their absorption spectrum do...

We describe a simple method for decorating graphene (1–5 layers) with Au and Ag nanostructures (nanoparticles, nanorods, and nanoplates). We deposit graphene electrostatically from highly-oriented pyrolytic graphite onto Si/SiO2 surfaces functionalized with (aminopropyl)trimethoxysilane and grow the metal nanostructures by a seed-mediated growth method from hexanethiolate-coated Au monolayer-pr...