Chemical Synthesis, Structure Characterization, and Optical Properties of Hollow PbS_x–Solid Au Heterodimer Nanostructures

Abstract

Heterodimer nanostructures have attracted extensive attention, owing to an increasing degree of complexity, functionality, and then importance. So far, all the reported ones are built from solid nanoparticles. Herein, nearly monodisperse heterodimer nanostructures are constructed by hollow PbS(x) and solid Au domains simultaneously through a mild reaction between PbS nanocrystals and the gold species in the presence of dodecylamine. Control experiments clearly reveal the underlying formation mechanism of the hollow PbS(x)-solid Au heterodimers. The Au(III) species in the solution, lead to the etching of PbS nanocrystals and the Au(I) species facilitate the control of the number of gold domains per nanoparticle. Dodecylamine molecules not only work as a stabilizer in the reaction, but also act as a reducing agent that could greatly affect the morphology of the product. The optical properties of the heterodimers are investigated based on UV/Vis absorption spectroscopy and Raman spectroscopy. This novel heterodimer nanostructure pushes the development of complex nanocrystal-based architectures forward, and also provides many opportunities for potential applications.

Ruthenium oxide-based nanocomposites with high specific surface area and improved capacitance as a supercapacitor

“…Increasing interest has been devoted towards the development of nanocomposites consisting of two or more different classes of materials with solid-state interfaces. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] The composite structures can combine two or more functionalities in one unit and oentimes exhibit synergistically enhanced properties compared to the simple sum of the constituents. [15][16][17][18][19][20][21][22][23][24] For example, the Pt nanoparticles in Pt-Fe 3 O 4 dumbbell-like structures, which were synthesized by epitaxial growth of Fe onto Pt nanoparticles followed by Fe oxidation, show a 20-fold increase in mass activity toward oxygen reduction reaction compared with the single component Pt nanoparticles and the commercial 3 nm Pt particles due to the electronic coupling between Pt and Fe 3 O 4 in Pt-Fe 3 O 4 dumbbell-like particles, which leads to slight change in electronic structure of Pt and results in signicant improvement in Pt catalysis.…”

Growth and reductive transformation of a gold shell around pyramidal cadmium selenide nanocrystals

“…The most common strategy for the synthesis of these HNCs is the seedmediated method in which one material is used as seed particle and a different material is grown around (coreshell HNCs [7,8]) or forming domains on their surface (oligomer-like HNCs). Examples of the latter case are metal-semiconductor heterodimers made of spherical domains [9][10][11][12], dumbbell-like [13,14], peanut-like [15] and matchstick-shaped [13,16,17] structures. Several reviews on heterostructured nanocrystals summarize the progress and the perspectives on this emerging field [3,4].…”

Metal-Based Composite Nanomaterials

“…The nanocomposites constructed by depositing gold on the surface of semiconductor nanocrystals are the topics being studied most sufficiently Yang et al , b, 2009Huang et al 2010;Zhao et al 2010). The deposition of noble metals on the surface of semiconductor nanocrystals is usually conducted in nonpolar organic solvent via seed-mediated growth at room temperature.…”

“…3, the deposition of noble metals on the surface of semiconductor nanocrystals is usually conducted in nonpolar organic solvent via seed-mediated growth at room temperature. Nevertheless, the noble metals are only limited in gold (Au), silver (Ag), and Pt Salant et al 2006;Yang et al , c, 2011bDukovic et al 2008;Huang et al 2010;Zhao et al 2010;. This is associated with the lack of noble metal precursors soluble in nonpolar organic solvents.…”