Abstract Download (8.38MB)

Name (Title):
Chengchun Tang
Affiliation:
International Center for Materials Nanoarchitectonics
(MANA), NIMS
Address:
1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Email: tang.chengchun@nims.go.jp
Home Page:
Presentation Title:
Novel Concept for Formation of Boron Nitride Nanoparticles
Abstract:
An intrinsic impetus for the synthesis and characterization of BN nanoparticles is to purse the
potential for improving traditional BN-based composite, taking advantage of the expected
excellent thermal and mechanical properties that result from nanoscale effect. However, the
number of methods available to produce basic BN nanoparticles in sufficient quantities and
impurity-free is limited to say the least. Although the great number of methods for the formation
of BN crystal or amorphous have reported in detail, the use of a relatively complicated route and
a toxic atmosphere limit their extensive use, even on laboratory scale. For the nanoparticles, there
has not been any method already reported and discussed.
The technique reported here represents a continuous process with a low-cost, high-purity and
high-yield product, and is particularly useful for future commercial application. A commercialavailable
trimethoxyborane (B(OMe)3) was found to be a considerably suitable precursor for the
CVD synthesis of BN nanoparticles, for the first time, and after 6-years technique improvement,
two products with the different character diameters, were systematically developed and these can
be immediately commercialized. The formation mechanism of the spherical BN nanoparticles
involve two main issues: (1) the formation of a intermediate phase of B(OMe)3-xH3-xN with a
normal single B-N bond length; (2) B-O species in the intermediates as the nucleation centers
leading to an isotropic growth. The smart development of the spherical BN nanoparticle
syntheses may be a vital step to promote applications of BN materials in fillers and thermal
interface materials, considering their remarkable insulating, and Rheological properties.
44
Figure 1. SEM image and growth mechanism of BN nanoparticles.
References:
1. C. C. Tang et al, Chem. Comm. 2002, 2826.
2. C. C. Tang et al, Adv. Func. Mater. 18, 2008, 3653.
Poster Session PM-2