Synthesis and Shape-Tailoring of Copper Sulfide/Indium Sulfide-Based Nanocrystals

Abstract

Heterostructured Cu2S-In2S3 nanocrystals with various shapes and compositions were synthesized by a high-temperature precursor-injection method using the semiconductor nanocrystal Cu1.94S as a catalyst. The intrinsic cationic deficiencies formed at high temperature by Cu ions made the Cu1.94S nanocrystal a good candidate for catalyzing the nucleation and subsequent growth of In 2S3 nanocrystals, eventually leading to the formation of heterostructured Cu2S-In2S3 nanocrystals. Gelification of the reaction systems, which were composed of different types of nanocrystal precursors and solvent, was found to be a very effective measure for controlling the growth kinetics of the heterostructured particles. Consequently, matchsticklike Cu2S3-In2S3 heterostructured nanorods, teardroplike quasi-core/shell Cu2S@In2S3 nanocrystals, and pencil-like In2S3 nanorods were successfully obtained by manipulating the gelification of the reaction system; this formed a solid experimental basis for further discussion of the growth mechanisms for differently shaped and structured nanocrystals. By reaction with 1,10-phenanthroline, a reagent that strongly and selectively binds to Cu(+), a compositional transformation from binary matchsticklike Cu2S-In2S3 nanorods to pure In2S3 nanorods was successfully achieved.

Communication: A density functional investigation of structure-property evolution in the tetrakis hexahedral C4Al14 nanocluster

“…The conventional image tends to be that of a (roughly) spherical core-shell ensemble, although alternative shapes are now known to be important, particularly in light of their potential applications in diverse areas such as nanoelectronics and biomedical sensors. [8][9][10][11] In our previous studies on core-shell C n Al 12 species, the n = 4 system has exhibited a unique behaviour. The original Al 12 shell generally preserved its near-icosahedral structure for n = 1 to 3, but, apparently due to an "oversized" carbon core, acquired a tetracapped-cube-like geometry for C 4 Al 12 .…”

A new strategy for synthesizing AgInS2 quantum dots emitting brightly in near-infrared window for in vivo imaging

“…A variety of binary NIR fluorescent QDs have been developed, including HgS 8 , PbS 9 , PbSe 10 , Ag 2 S 11, 12 , etc. In recent years, chalcopyrite-type I-III-VI ternary semiconductor QDs have been appealing to increasing researchers, due to their tunable band-gap energy, high absorption coefficients, nonlinear optical properties, and solution processability [13][14][15][16][17][18][19][20][21][22] .…”

Charge Transport in Cu2S Nanocrystals Arrays: Effects of Crystallite Size and Ligand Length

“…The NCs were prepared using bottom up approach revealing highly faceted mono-dispersed 14 nm Cu 2 S NC passivated by dodecanethiol [21]. "Small NCs"…”