CHẾ TẠO CÁC HẠT NANO VÀNG 1-5 nm SỬ DỤNG CHẤT HOẠT ĐỘNG BỀ MẶT CTAB THEO PHƯƠNG PHÁP MICELL

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2020

Mô tả vật lý: tr.96-100

Bộ sưu tập: Báo, Tạp chí

ID: 314328

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Bài báo này trình bày cách chế tạo các hạt nano vàng kích thước nhỏ theo phương pháp khử hóa học bằng cách sử dụng NaBH4 làm chất khử cho tiền chất HAuCl4 trong sự có mặt của CTAB. Trong phản ứng này, CTAB không những đóng vai trò là chất khử mà còn đóng vai trò là chất hoạt động bề mặt cần thiết để tạo các hạt nano vàng đồng đều về kích thước, đặc biệt là các hạt nano vàng có cấu trúc tinh thể. Các hạt nano vàng đã được tổng hợp bằng phương pháp micecell với nồng độ CTAB thay đổi từ 0,05M đến 0,1 M
nồng độ ion Au3+ thay đổi từ 2,5*10-4M đến 1,5*10-3M với thời gian khảo sát trong hai tuần. Hình thái và kích thước hạt được xác định bằng ảnh hiển vi điện tử truyền qua TEM, tính chất quang được khảo sát bằng phổ hấp thụ UV-VIS. Kết quả cho thấy, vật liệu có kích thước phân bố từ 1 nm đến 5 nm và kích thước có xu hướng tăng theo thời gian bảo quản tại nhiệt độ phòng. Đồng thời, khi nồng độ tiền chất không đổi, nồng độ CTAB càng thấp thì kích thước hạt càng phát triển mạnh theo thời gian. Khi nồng độ CTAB không đổi, lượng tiền chất HAuCl4 càng lớn thì kích thước hạt cũng càng lớn. Với nồng độ CTAB bằng 0,01 M, nồng độ muối vàng cần lựa chọn phải cỡ 10-3 M, các hạt có đường kính cỡ 5 nm được tạo ra.This paper presents how to fabricate small gold nanoparticles chemically by using NaBH4 as a reducing agent for HAuCl4 precursor in the presence of CTAB. In this reaction, CTAB not only acts as a reducing agent but also acts as a surfactant needed to create uniform gold nanoparticles in size, especially gold nanoparticles with crystal structure. Gold nanoparticles were synthesized by micecell method with the CTAB concentration varying from 0.05M to 0.1M
Au3 + ion concentrations ranged from 2.5 * 10-4M to 1.5 * 10-3 M with the survey time of two weeks. Morphology and particle size were determined by electron microscopy images transmitted through TEM, optical properties were investigated by UV-VIS absorption spectrum. The results showed that the material has size distribution from 1 nm to 5 nm and size tends to increase with storage time at room temperature. At the same time, when the precursor concentration was constant, the lower the CTAB concentration, the stronger the particle size developed over time. When the CTAB concentration is constant, the larger the amount of HAuCl4 precursor was, the larger the particle size was. With a CTAB concentration of 0.01 M, the gold salt concentration to be selected must be 10-3 M, the particles have a diameter of 5 nm.

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