Chế tạo các nano hợp kim Ag/Au để phát hiện xanh methylene bằng tán xạ raman tăng cường bề mặt

Trong nghiên cứu này tác giả trình bày kết quả mới về chế tạo nano hợp kim bạc/vàng nhằm phát hiện xanh methylene bằng phương pháp tán xạ Raman tăng cường bề mặt. Các nano hợp kim bạc/vàng (AgAu alloy) được chế tạo bằng phương pháp khử hóa học đồng thời AgNO3 và HAuCl4 bởi trisodium citrate (Na3C6H5O7). | TNU Journal of Science and Technology 226 07 128 - 134 FABRICATION OF Ag Au ALLOY NANOSTRUCTURE FOR METHYLENE BLUE DETECTION BY SURFACE ENHANCED RAMAN SCATTERING Vu Xuan Hoa TNU - University of Sciences ARTICLE INFO ABSTRACT Received 24 3 2021 In this study the author presents new results on the fabrication of silver gold alloy nanostructures AgAu alloy to detect methylene blue by Revised 18 5 2021 surface-enhanced Raman scattering SERS method. The silver gold alloy Published 24 5 2021 nanoparticles are fabricated by the simultaneous reduction of AgNO 3 and HAuCl4 by by trisodium citrate TSC . The obtained products are KEYWORDS investigated on some properties the morphology of the alloy NPs are examined using transmission electron microscopy TEM . The lattice Nano alloy constants of samples and the formation of homogeneous Ag Au alloy Plasmon absorption nanocrystals were confirmed by high-resolution transmission electron SERS microscopy HRTEM technique. The optical property plasmon absorption was analyzed by ultraviolet-visible UV-Vis spectroscopy the Methylene blue experiment for methylene blue MB detection by the surface enhanced TEM Raman scattering spectroscopy. The results show that AgAu alloy nanoparticles with molar component ratio 1 2 have a spherical shape the size in the range of 40-50 nm and the plasmon absorption peak at 523 nm. Interestingly the highest SERS activity achieved at AgAu alloy sample with limit of detection LOD equals 10-8 M and the linear dependence was found between the logarithmic concentration of MB and the intensities of the 1624 cm-1 peak as shown in equation LogI 0 33 LogC 5 54 R2 0 997. This result is particularly interesting for making the high-sensitivity chemical sensors for quantitative analysis of harmful pigments in food safety. CHẾ TẠO CÁC NANO HỢP KIM Ag Au ĐỂ PHÁT HIỆN XANH METHYLENE BẰNG TÁN XẠ RAMAN TĂNG CƯỜNG BỀ MẶT Vũ Xuân Hòa Trường Đại học Khoa học - ĐH Thái Nguyên THÔNG TIN BÀI BÁO TÓM TẮT Ngày nhận bài 24 3 2021 .