The plasmon characterization of AgNS on paper was systematically investigated by the diffuse reflectance spectroscopy. The fabricated paper-based SERS substrates were used to detect melamine in an aqueous solution and to determine the influence of type RAs on the enhancement factor (EF) and signal uniformity of SERS substrates. Among the four types of RAs, the SERS substrates used NaBH4 have the highest SERS signal with the limit of detection of 10-8 M for melamine and the EF = × 109 . | Vietnam Journal of Science and Technology 62 2 2024 279-287 doi 2525-2518 17088 Influence of the reducing agents on morphology and properties of silver structures on paper Nguyen Thi Bich Ngoc1 2 Nguyen Thi Thuy1 Nguyen Trong Nghia1 Nguyen Duc Toan1 2 Dao Duc Manh3 Chu Viet Ha4 Nghiem Thi Ha Lien1 1 Institute of Physics Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Cau Giay Ha Noi Viet Nam 2 Graduate University of Science and Technology Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Cau Giay Ha Noi Viet Nam 3 Hanoi Pedagogical University 2 Xuan Hoa Phuc Yen city Vinh Phuc Viet Nam 4 Thai Nguyen University of Education 20 Luong Ngoc Quyen Thai Nguyen city Thai Nguyen Viet Nam Emails ntbngoc@ chuvietha@ Received 22 April 2022 Accepted for publication 22 July 2022 Abstract. Paper-based SERS substrates PSSs with tunable plasmonic properties and excellent flexibility have been applied in various fields. These SERS substrates were prepared using a direct chemical reduction synthesis method for the present work. By using various types of reducing agents RAs 1 sodium borohydride NaBH4 2 ascorbic acid L-AA 3 glucose and 4 formaldehyde HCHO the silver nanostructures AgNS on cellulose paper fiber was fabricated with the morphologies. Morphological research results have shown that with strong RAs AgNS on paper substrates have a spherical shape. In contrast with weak RAs ANS on paper substrates have an anisotropic morphology which depends on the crystal surface development priority. Specifically AgNS generated on paper using glucose have a bar shape and thin planar silvery-wing shape when using the reducing agent L-AA. The plasmon characterization of AgNS on paper was systematically investigated by the diffuse reflectance spectroscopy. The fabricated paper-based SERS substrates were used to detect melamine in an aqueous solution and to determine the influence of type RAs on the enhancement factor EF and signal .
