TỔNG HỢP VÀ NGHIÊN CỨU ĐẶC TRƯNG PHỔ RAMAN, TÍNH CHẤT QUANG HỌC CỦA CÁC CHẤM LƯỢNG TỬ GRAPHENE VÀ CÁC CHẤM LƯỢNG TỬ GRAPHENE PHA TẠP NITƠ

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Thông tin xuất bản: Tạp chí Khoa học - Trường Đại học Sư phạm Hà Nội: Khoa học Tự nhiên, 2020

Mô tả vật lý: tr.82

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ID: 312862

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In this report we present completely new results on the improvement of the method of producing graphene quantum dots (GQDs) and nitrogen-doped graphene quantum dots (GQD-N), by using the microwave with different powers and durations, from citric acid and urea. This is a new and unprecedented method of fabrication. The use of microwaves has allowed ultra-fast fabrication of GQDs and nitrogen doped GQDs. These GQDs had their characteristics identified by Raman scattering spectra for the characteristic C-C graphene vibration mode (G-peak) anddefects of GQDs (D-peak). The absorption spectra of GQDs samples were fabricated under different conditions, with an expectation of different sizes, to be compared and analyzed. Theseabsorption spectra were also compared with those of the GQD-N produced under the same conditions. The absorption echanism of GQDs and GQD-N is presented in detail. Measurements of the photoluminescence spectra in GQDs and GQD-N have also been recorded and analyzed. The fluorescence mechanism will be presented, explained, and compared with that of authors in other international publications. Some of the TEM and HR-TEM images of these two samples were also presented to confirm the shape, size and in-plane spacing lattice of the GQD structure.Trong bài báo này, các kết quả hoàn toàn mới về cải tiến phương pháp chế tạo các chấm lượng tử graphene (GQDs) và các chấm lượng tử graphene pha tạp nitơ (N-GQD) bằng cách sử dụng lò vi sóng với các cường độ và thời gian khác nhau. Đây là phương phápchế tạo mới và chưa từng có ở Việt Nam. Việc sử dụng lò vi sóng đã cho phép chế tạo GQDs và N-GQD một cách nhanh chóng. Những GQDs này có các đặc tính của chúng được xác định bởi phổ tán xạ Raman. Phổ hấp thụ của các mẫu GQDs chế tạo trong các điều kiện khác nhau, với sự mong đợi về các kích thước khác nhau, cũng được so sánh và phân tích. Các phổ hấp thụ này cũng được so sánh với các phổ của N-GQD được chế tạo trong cùng điều kiện. Cơ chế hấp thụ của GQDs và N-GQD sẽ được trình bày chi tiết. Các phép đo huỳnh quang của GQDs và GQD-N cũng đã được ghi nhận và phân tích.

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