Controlled synthesis of gold nanorods and integrated with titanium dioxide for enhancing visible light-driven antioxidant activity

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.
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Controlled synthesis of gold nanorods and integrated with titanium dioxide for enhancing visible light-driven antioxidant activityCite this paper: Vietnam J. Chem., 2023, 61(S2), 7-13 Research ArticleDOI: 10.1002/vjch.202300037 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 Nam2 Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City 70000, Viet Nam3 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, 2023Abstract 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 2with 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 from400 to 900 nm by adjusting the ratio between seed solution and reducing agent concentration. Besides, the absorption ofthe UV-light function of TiO2 and the antioxidant properties of gold nanoparticles were also integrated to prepare a kindof multifunctional material. The obtained AuNRs/TiO2 were then determined by ultraviolet-visible spectroscopy (UV-Vis), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmissionelectron microscopy (HR-TEM), selected area electron diffraction (SAED), and energy-dispersive X-ray spectroscopy(EDS). Microscopic images (TEM, SEM) revealed that the average particle size of the AuNRs decorated in the titaniumdioxide ranged from 20 to 60 nm, depending on the experimental parameters. Furthermore, HRTEM, EDS, and SAEDresults provided more precise information insight into the formed gold nanocrystals. The AuNRs/TiO2 exhibitedsuperior antioxidant activity by reducing free 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals at differentconcentrations. The results indicated that AuNRs/TiO2 improves antioxidant and optical absorption activities. Theantioxidation effect was proved more excellent than solely used of spherical, rod-liked gold nanoparticles or TiO2nanoparticles. This novel design of AuNRs/TiO2 may open a new avenue for facilitating multifunctional nanoparticlesin cosmetic applications. Keywords. Gold nanorods, titanium dioxide, antioxidant activity, multifunctional nanomaterials.1. INTRODUCTIONNanomaterial-based use for preparing antioxidant supporting the catalyst dispersion,[2,3] and limitingagents has attracted much attention in the last few their aggregation under turnover conditions.[4,5]years. By utilizing external light-induced, the effect However, the main issue in solely utilizing titaniumof antioxidant activity is further enhanced. TiO2 dioxide is low efficiency for solar light-drivenplayed a critical role as a photo absorber,[1] applications because of the wide band gap (about 3.27 Wiley Online Library © 2023 Vietnam Academy of Science and Technology, Hanoi & Wiley-VCH GmbH 25728288, 2023, S2, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vjch.202300037 by Readcube (Labtiva Inc.), Wiley Online Library on [01/05/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons LicenseVietnam Journal of Chemistry ...