In this research, we synthesized gold nanobipyramids by seed mediated method using cetyltrimethylammonium bromide surfactant. Gold nanobipyramids was removed cetyltrimethylammonium bromide and modified the surface using polyethylene glycol, polyvinyl alcohol and chitosan as the stabilizers. | Communications in Physics, Vol. 28, No. 2 (2018), pp. 179-187 DOI: SYNTHESIS OF GOLD NANOBIPYRAMIDS BY SEED-MEDIATED METHOD AND ANTIBACTERIAL ACTIVITIES NGO VO KE THANH1,2† , HUYNH TRONG PHAT1 , NGUYEN THI KIM ANH1 , NGUYEN DANG GIANG1 , LAM QUANG VINH3 , 1 The Research Laboratories of Saigon High-Tech Park, Saigon Hi-Tech Park Lot I3, N2 Street, Saigon Hi-Tech Park, District 9, Ho Chi Minh City, Vietnam 2 Institute for Computational Science and Technology, SBI building, Quang Trung Software City, Tan Chanh Hiep ward, district 12, Ho Chi Minh city, Vietnam 3 Vietnam National University Ho Chi Minh City Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam † E-mail: ngovokethanh@; Received 1 November 2018 Accepted for publication 31 March 2018 Published 16 June 2018 Abstract. Metallic nanoparticles as antibacterial agents have been studied for several years. The most used antibacterial nanoparticles are silver nanoparticles. The mechanisms and antibacterial properties of silver nanoparticles are well known, but the effects of gold nanoparticles, especially gold nano bipyramids, are not considered. In this research, we synthesized gold nanobipyramids by seed mediated method using cetyltrimethylammonium bromide surfactant. Gold nanobipyramids was removed cetyltrimethylammonium bromide and modified the surface using polyethylene glycol, polyvinyl alcohol and chitosan as the stabilizers. Besides, antibacterial effects of gold nanobipyramids on both Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) were investigated in this paper. The results showed that gold nanobipyramids have good antibacterial activities even at low concentration. The optimal concentration of stabilizers and gold nanobipyramids in antibacterial activities were also studied in this paper. Keywords: gold nanobipyramids, antibacterial activities, nanoparticles, chemical reduction .
