In this work, gold nanorods (AuNRs) with well-controlled aspect ratios were prepared using a modified seedgrowth method and covered by TiO2 layers through the hydrothermal reaction to improve stability. Integrating TiO2 with plasmonic rod-like gold nanoparticles could enhance their photo activity by the local surface plasmon resonance (LSPR) effect. AuNRs aspect ratios were controlled by varying the amount of seed solution, reducing agents, surfactant (CTAB), and titanium (IV) but oxide. The optical properties of formed AuNRs can be tuned in the spectral range from 400 to 900 nm by adjusting the ratio between seed solution and reducing agent concentration. | Cite this paper Vietnam J. Chem. 2023 61 S2 7-13 Research Article DOI Controlled synthesis of gold nanorods and integrated with titanium dioxide for enhancing visible light-driven antioxidant activity Thu Anh Nguyen1 2 Ngan Thi Kim Nguyen1 2 Sy Van Vu1 2 Linh Ngoc To1 2 Vinh Hoang Lam1 2 Tien Nu Hoang Lo3 In Park3 4 Tien Huu Ho5 Khuong Quoc Vo1 2 1 Faculty of Chemistry University of Science Vietnam National University - Ho Chi Minh City 227 Nguyen Van Cu Street Ward 4 District 5 Ho Chi Minh City 70000 Viet Nam 2 Vietnam National University Ho Chi Minh City Linh Trung Ward Thu Duc City Ho Chi Minh City 70000 Viet Nam 3 Research Institute of Clean Manufacturing System Korea Institute of Industrial Technology KITECH 89 Yangdaegiro-gil Ipjang-myeon Cheonan 31056 South Korea 4 KITECH school University of Science and Technology UST 176 Gajeong-dong Yuseong-gu Daejeon 34113 South Korea 5 Thu Dau Mot University Number 6 Tran Van On Street Phu Hoa Ward Thu Dau Mot City Binh Duong Province 75000 Viet Nam Submitted February 17 2023 Revised April 8 2023 Accepted May 5 2023 Abstract In this work gold nanorods AuNRs with well-controlled aspect ratios were prepared using a modified seed- growth method and covered by TiO2 layers through the hydrothermal reaction to improve stability. Integrating TiO 2 with plasmonic rod-like gold nanoparticles could enhance their photo activity by the local surface plasmon resonance LSPR effect. AuNRs aspect ratios were controlled by varying the amount of seed solution reducing agents surfactant CTAB and titanium IV but oxide. The optical properties of formed AuNRs can be tuned in the spectral range from 400 to 900 nm by adjusting the ratio between seed solution and reducing agent concentration. Besides the absorption of the UV-light function of TiO2 and the antioxidant properties of gold nanoparticles were also integrated to prepare a kind of multifunctional material. The obtained AuNRs TiO2 were then determined by .
