Nonepitaxial Growth of Hybrid Core-Shell Nanostructures with Large Lattice Mismatches

Abstract

We report a synthetic route to achieving nanoscale heterostructures consisting of a metal core and monocrystalline semiconductor shell with substantial lattice mismatches between them, which cannot be obtained by conventional epitaxial techniques. By controlling soft acid-base coordination reactions between molecular complexes and colloidal nanostructures, we show that chemical thermodynamics can drive nanoscale monocrystalline growth of the semiconductor shell with a lattice structure incommensurate with that of the core. More complex hybrid core-shell structures with azimuthal and radial nanotailoring of structures and compositions of the monocrystalline semiconductor shell are also demonstrated.

Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots

“…6 Given the similarity of 1S  with 2  on one hand, and the similarity of 3S  with 4  on the other, we attribute the entire red shift of the peak position in the non-magnetic samples 2 and 4, and the slower component of the red shift in the magnetic samples 1 and 3 to the same spinindependent mechanism. A possible mechanism could be electric-dipole layer formation at the wetting layer/ZnSe matrix interface.…”

Surface modification-induced phase transformation of hexagonal close-packed gold square sheets

“…In addition, the electron beam-induced phase transformation has also been observed, such as the transformation of Cu 2 S nanorods from low-chalcocite to highchalcocite structures 14 . Meanwhile, cation exchange has also been used for the structure manipulation of inorganic nanocrystals [15][16][17] . However, it should be noted that the composition of the initial nanocrystals will be changed after the cation exchange.…”

Oriented attachment of nanoparticles to form micrometer-sized nanosheets/nanobelts by topotactic reaction on rigid/flexible substrates with improved electronic properties

“…1 Then, it provided electrostatic force and cation passivation on c-Ag 2-δ X nanosheets, from which better contact with negative-charged substrate could be obtained. With the addition of TBP, by the interfacial cation exchange reaction between the a-Ag 2-δ X nanosheets and Cd 2+ ions in methanol solution, 24 quasi-single-crystalline (quasi-sc) CdX nanosheets could be obtained on rigid/flexible substrates through the 3-D OA of CdX CQDs. The excess of Cd 2+ ions also can stabilize the surface of the CdX nanosheets to give better contact with the substrate.…”

“…24 Typically, micrometer-sized Ag nanosheets on a given substrate (1 × 1 cm) were immersed in a mixture of 8 ml ethanol, 0.05 ml acetone and 0.005 ml dodecanethiol in a glass vessel at room temperature. A solution of 0.5 ml Te precursor (1 mmol Te powder mixed with 7.5 ml toluene and 7.5 ml trioctylphosphine (TOP), heated at 50°C for 30 min) was added.…”