Pyramidal Lead Sulfide Crystallites With High Energy {113} Facets

Abstract

A new, generic method to exercise control over the shape of crystallites is reported. Crystals of PbS are grown in the unusual form of pyramids at the water-toluene interface. The pyramids are single crystalline and adopt a unique growth habit (slow growth along [113] direction). The pyramids are exclusive products of the reaction and are obtained in the form of a monolayered film spread across the fluid interface. The origins of the growth habit and assembly lie in phenomena unique to the liquid-liquid interface. The dimensions of the pyramidal base can be controllably varied in the range 575-1260 nm. Crystallites of other forms such as rods and spheres can be obtained by varying the properties of the fluid interface.

Controlled Synthesis and Enhanced Catalytic and Gas‐Sensing Properties of Tin Dioxide Nanoparticles with Exposed High‐Energy Facets

“…Particularly, high-energy facets that contain abundant unsaturated coordination atoms and atomic steps and ledges usually exhibit high reactivity. [1][2][3][4][5][6][7] However, during the crystal growth process, the high-energy facets quickly disappear to minimize the surface energy of the crystals. Control of the exposed high-energy crystal facets is still a challenging research topic, especially for metal oxides, in which the surface energy is very difficult to modify because of the strong metal-oxygen bonds.…”

Structural Effects of Fe3O4 Nanocrystals on Peroxidase‐Like Activity

“…[12][13][14][15][16] Much success has been achieved in the investigation of the structural effects of nanocrystals on catalysis and the results showed that the catalytic performance could be specifically regulated either by the crystal size or morphology with distinct crystallographic planes. [17][18][19][20][21] The reason might be that different crystal sizes or planes exhibit different numbers of dangling bonds and different atom arrangement manners, which intrinsically determine the reactivity and selectivity of catalysts. For instance, Co 3 O 4 nanosheets with exposed {112} planes exhibited enhanced catalytic activity for methane combustion than Co 3 O 4 nanobelts with {011} planes and nanocubes with {001} planes.…”

Growth of nanocrystalline thin films of metal sulfides [CdS, ZnS, CuS and PbS] at the water–oil interface

“…For example, PbS nanocrystals have been shown to change from sphere to rod growth by simply altering the structure of the Pb source. 8 Herein, we have identied a class of complexes based on the thiobiuret ligand all of which are found suited for deposition of binary metal suldes at the water-toluene interface.…”

“…Molecular precursor mediated interfacial deposition of nanostructures is one such scheme. A recent revival of interest in this area [5][6][7] has led to materials of topical interest such as thin lms made of pyramidal PbS nanocrystals bound by high energy {331} surfaces, 8 nanorod structures of CdS 9 and Bi 2 S 3 .…”