A Two-Step Hydrothermal Synthesis Approach to Monodispersed Colloidal Carbon Spheres

Abstract

This work reports a newly developed two-step hydrothermal method for the synthesis of monodispersed colloidal carbon spheres (CCS) under mild conditions. Using this approach, monodispersed CCS with diameters ranging from 160 to 400 nm were synthesized with a standard deviation around 8%. The monomer concentration ranging from 0.1 to 0.4 M is in favor of generation of narrower size distribution of CCS. The particle characteristics (e.g., shape, size, and distribution) and chemical stability were then characterized by using various techniques, including scanning electron microscopy (SEM), FT-IR spectrum analysis, and thermalgravity analysis (TGA). The possible nucleation and growth mechanism of colloidal carbon spheres were also discussed. The findings would be useful for the synthesis of more monodispersed nanoparticles and for the functional assembly.

Hydrothermal synthesis, characterization, and KOH activation of carbon spheres from glucose

“…The oxygen content of CSs calculated from XPS was 38.7%, which was much higher than traditional carbonaceous materials. 17,[23][24][25] Above all, -OH and C@O were the major oxygen-containing groups on the CSs, which is in agreement with the results obtained from the FT-IR measurement for C 1S .…”

“…When the concentration reaches the critical super-saturation point, a burst nucleation process occurs. 17 As the samples do not reach this threshold at low temperatures, this could be the reason that no carbon spheres are formed.…”

“…[1][2][3][4][5][6] Various methods have been used to fabricate carbon spheres, such as chemical vapor deposition, 7 high-temperature pyrolysis, 8,9 and hydrothermal treatment. [10][11][12][13][14][15][16][17][18][19] Among them, the hydrothermal method is unique because of its simple operational and mild reaction condition requirements. 16 Carbon spheres with regular spherical shapes and controllable sizes are potential candidates to serve as porous functional materials.…”

Micro/nano-scaled carbon spheres based on hydrothermal carbonization of agarose

“…From polybenzoxazine-based nanospheres, Wang et al obtained the CSs with sizes from 95nm up to 225 nm by a straightforward temperature programming process [16]. Based on hydrothermal carbonization of glucose, Chen et al prepared the CSs with sizes from 160 nm up to 400 nm, depending on the glucose concentration in the precursor solution [17]. Sun et al synthesized CSs from glucose under solvothermal conditions at 160~180°C, showing that the CSs' size depends on temperature and glucose concentration [18].…”

Hierarchical strontium carbonate submicron spheres self‐assembled under hydrothermal conditions

“…Most recently, hydrothermal method has also been emerged as a thriving technique for the facile fabrication of the complex hierarchical architectures, such as cantaloupe-like AlOOH superstructures [24], hierarchical Ni(OH) 2 /NiO hollow architectures [25], hierarchical Bi 2 WO 6 microspheres [26] and octahedron-like structures [27], monodispersed colloidal carbon spheres [28], and hierarchical InVO 4 mesoporous microspheres [29]. In this contribution, we report a facile hydrothermal © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.crt-journal.org strategy for hierarchical SrCO 3 submicron spheres with detectable cavities on the surfaces and porous structures within the body, which are self-assembled by related nanoparticles under hydrothermal conditions in presence of EDTA disodium salt and MgCl 2 as additives.…”