Generalized syntheses of nanocrystal–graphene hybrids in high-boiling-point organic solvents

Abstract

Nanocrystal-graphene have been proposed as a new kind of promising hybrid for a wide range of application areas including catalysts, electronics, sensors, biomedicine, and energy storage, etc. Although a variety of methods have been developed for the preparation of hybrids, a facile and general synthetic approach is still highly required. In this study, nanocrystal-graphene hybrids were successfully synthesized in high-boiling-point organic solvents. Graphene oxide (GO) nanosheets were modified by oleylamine (OLA) to form a OLA-GO complex in order to be readily incorporated into hydrophobic synthesis. A rich library of highly crystalline nanocrystals, with types including noble metal, metal oxide, magnetic material and semiconductor were successfully grown on chemically converted graphene (CCG), which is simultaneously reduced from GO during the synthesis. High boiling-point solvents afford sufficient thermal energy to assure the high-quality crystalline nature of NCs, therefore the post-annealing process is obviated. Controlled experiments revealed that OLA-GO triggers heterogeneous nucleation and serves as excellent nuclei anchorage media. The protocol developed here brings one step closer to achieve "unity in diversity" on the preparation of nanocrystal-graphene hybrids.

A one-pot synthesis of reduced graphene oxide–Cu2S quantum dot hybrids for optoelectronic devices

“…Meanwhile, the GO was also reduced to rGO by OLA. 17 From the high-resolution TEM (HRTEM) image in Fig. 1a shows a typical transmission electron microscopy (TEM) image of the rGO-Cu 2 S QD hybrids.…”

Preparation of Sn-aminoclay (SnAC)-templated Fe3O4 nanoparticles as an anode material for lithium-ion batteries

“…The obtained images agreed with the high-resolution TEM images for the existence of the lattice fringes of Fe 3 O 4 and SnO 2 in the hybrid structure with interplanar distances of 0.61 nm, and 0.25 nm, corresponding to the d(511), and d(311) lattice planes of Fe 3 O 4 , respectively, and the d spacing of 0.35 nm corresponding to the (110) plane of SnO 2 . [14][15][16][17] In order to further investigate the morphologies of the synthesized architecture, the N 2 adsorption/desorption was measured for both the annealed SnAC-Fe 3 O 4 and annealed SnAC. The obtained results clearly exhibited typical II hysteresis loops in the 0-1 relative range, as characteristic of the different pore sizes (Fig.…”

Direct dry-grinding synthesis of monodisperse lipophilic CuS nanoparticles

“…[24] The C 1s peak was resolved as two peaks located at 284.6 eV and 285.7 eV, which respectively corresponded to the hydrocarbon (C-C, C-H) in oleylamine and the C-N bond in oleylamine. [25] The S 2p peak of the CuS nanoparticles consisted of two distinct peaks. The one at 161.5 eV originated from the typical sulfide bond, and the doublets at 162 eV and 163.5 eV demonstrated the formation of S–H bonds.…”