KHẢO SÁT ẢNH HƯỞNG ĐỘ pH CỦA METHYL ĐỎ HẤP PHỤ TRÊN TẤM VUÔNG NANO BẠC LÊN PHỔ TÁN XẠ RAMAN TĂNG CƯỜNG BỀ MẶT

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Tác giả: Thị Loan Nguyễn, Thị Thu Hà Phạm, Xuân Hoà Vũ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2023

Mô tả vật lý: tr.327 - 334

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ID: 337086

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In this study, we present the results of investigating the pH effect of methyl red (MR) on surface-enhanced Raman spectroscopy (SERS) using the substrate of the silver nanoparticles (Ag-NPs) and silver plates square (Ag-PS). Ag-PS were fabricated by photochemical method under green light-emitting diode (LED) irradiation (λ = 532 nm) onto a solution of silver nanoparticles. Morphology and size of the as-obtained Ag-PS were characterized by scanning electron microscopy (SEM) and transmition electron microscopy (TEM). Optical properties were characterized by ultraviolet- visible absorption. The crystal structure of the samples was investigated by X-ray diffraction (XRD). Surface-enhanced Raman scattering spectroscopy (SERS) was used to investigate the effect of pH = 2.01
3.91
5.1
6.36 and 8.96. The results show that when pH <
5 the Raman spectral intensity is strongly enhanced at 1609 cm-1 while at pH >
5 it is enhanced at 1396 cm-1. Interestingly at pH = 2.01, the linear dependence between the logarithm of the SERS signal intensity (log I) and the logarithm of the MR concentration (log C) occurred in the range from 3*10-8 M to 10-4 M and detection of limit (LOD) reach 3*10-8 M.Trong nghiên cứu này chúng tôi giới thiệu kết quả khảo sát ảnh hưởng của độ pH của MR lên phổ tán xạ Raman tăng cường bề mặt (SERS) khi chúng hấp phụ trên đế nano bạc dạng cầu (Ag-NPs) và dạng tấm vuông (Ag-PS). Các nano bạc dạng tấm vuông được chế tạo bằng phương pháp quang hoá dưới kích thích của ánh sáng LED xanh lá (l = 532 nm) lên dung dịch các mầm nano bạc. Các nano bạc sau chế tạo được khảo sát các tính chất như: Tính chất quang bằng phổ hấp thụ (UV-Vis), cấu trúc tinh thể bằng giản đồ nhiễu xạ tia X (XRD), hình thái kích thước hạt bằng kính hiển vi điện tử truyền qua (TEM) và kính hiển vi điện tử quét (SEM). Phổ tán xạ Raman tăng cường bề mặt (SERS) được sử dụng để khảo sát ảnh hưởng của độ pH = 2,01
3,91
5,1
6,36 và 8,96. Kết quả chỉ ra rằng khi pH<
5 cường độ phổ Raman tăng cường mạnh tại 1609 cm-1 trong khi pH>
5 thì tăng cường tại 1396 cm-1. Đặc biệt, ở pH=2,01 logrit của cường độ Raman tại 1609 cm-1 phụ thuộc tuyến tính với logarit nồng độ và giới hạn phát hiện 3*10-8 M.

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