K.L. Firestein*, A.E. Steinman, D.V. Leybo, A.M. Kovalskii, D.V. Shtansky, D. Golberg

 

School of Chemistry, Physics and Mechanical Engineering,
Science and Engineering Faculty, Queensland University of Technology
2nd George st., Brisbane, QLD 4000, Australia

 

New hybrid nanomaterials are the key components of the next generation advanced catalysts and biomaterials. Herein, we have focused on the fabrication of BN/Ag nanohybrids (NHs) and their possible applications as novel high-active catalysts and antibacterial agents.BN/Ag hybrid nanoparticles (NPs) were fabricated via two methods: (i) chemical vapour deposition (CVD) of BNNPs in the presence of Ag vapours, and (ii) ultraviolet (UV) decomposition of AgNO3 in a suspension of CVD BNNPs. The microstructure of BN/Ag nanohybrids was studied by high-resolution transmission electron microscopy (HRTEM), high-angular dark-field scanning TEM imaging (HADF), Fourie transform infrared spectroscopy (FTIR), and energy-dispersive X-ray spectroscopy (EDS) mapping. Thorough structural characterization showed that Ag NPs, 5-15 nm in diameter, had been uniformly distributed over BNNPs surfaces. For the BN/Ag samples obtained under AgNO3 decomposition, some larger Ag NPs, up to 35 nm, were also observed. The fabricated nanohybrids were then characterized in terms of their thermal stability, catalytic and antibacterial activities. The materials synthesized via UV decomposition of AgNO3 demonstrated much better catalytic activity in comparison to those prepared using CVD method. The best catalytic characteristics (100% methanol conversion at 350 °C) were achieved using the UV BN/Ag NHs. Our data also confirmed that both types of the BN/Ag NHs possess a profound antibacterial effect against Escherichia coli К-261 bacteria.

Figure 1: HRTEM (a), HADF-STEM (b) and corresponding spatially-resolved EDS map (c) of BN/Ag nanohybrids

Biographic Details

Konstantin Firestein

Title: Dr.

Affiliation, Country: Science and Engineering Faculty, Queensland University of Technology, 2nd George st., Brisbane, QLD 4000, Australia

Phone: +61 3138 2000; E-mail: konstantin.faershteyn@qut.edu.au

Research interests: nanomaterials, chemical vapor deposition, catalysts.