Chế tạo vật liệu ZnO cấu trúc nano tetrapod bằng phương pháp bốc bay nhiệt không sử dụng mầm kết tinh trong điều kiện áp suất khí quyển=Fabrication of tetrapod nanomaterials by thermal evaporation at atmospheric pressure without crystallisation

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Tác giả: Văn Hán Hoàng

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ Việt Nam, 2025

Mô tả vật lý: tr.50-53

Bộ sưu tập: Metadata

ID: 478449

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In this study, we propose a method for fabricating nano ZnO tetrapod materials synthesised through the thermal evaporation of Zn powder mixed with C at a 1:1 ratio under non-crystalline seed conditions and air pressure. The Zn powder is oxidised at 1,050ºC, developing nano ZnO crystals with a uniform structure. Each centre develops four nanowires, forming a tetrapod shape. The diameter of each nanowire is about 30-40 nm
the length is from 200 to 1,000 nm. A more specific study of the material structure by X-ray diffraction diagram shows that the sample has a typical hexagonal crystal structure. Laser-excited fluorescence spectroscopy using a He-Cd laser (325 nm) shows that the emission spectrum consists of two regions of 381 nm and 514 nm, characteristic of a ZnO semiconductor. These results prove that there is a certain necessary ratio of zinc and oxygen in the vapour phase to create tetrapodshaped nano ZnO crystals. The synthesised material exhibits higher porosity, providing significant advantages in gas sensor fabrication.Trong nghiên cứu này, chúng tôi đề xuất phương pháp chế tạo vật liệu nano ZnO cấu trúc nano tetrapod thông qua sự bốc bay nhiệt của hỗn hợp bột Zn và C với tỷ lệ 1:1 trong điều kiện không mầm kết tinh và áp suất không khí. Bột Zn bị ôxy hóa ở 1.050oC, dẫn đến sự phát triển của các tinh thể nano ZnO với cấu trúc đồng nhất. Mỗi tâm phát triển bốn dây nano, tạo thành dạng bốn chân. Đường kính của mỗi dây nano khoảng 30-40 nm, chiều dài từ 200 đến 1.000 nm. Khảo sát cụ thể hơn cấu trúc vật liệu bằng giản đồ nhiễu xạ tia X cho thấy, mẫu có cấu trúc tinh thể lục giác (hexagonal) điển hình. Sử dụng phổ huỳnh quang kích thích bằng laser He-Cd với bước sóng 325 nm cho thấy, phổ phát quang gồm 2 vùng 381 và 514 nm đặc trưng của bán dẫn ZnO. Những kết quả này chứng minh rằng, có một tỷ lệ kẽm và ôxy cần thiết trong pha hơi để tạo ra tinh thể nano ZnO hình bốn chân. Vật liệu được tạo ra có tính xốp cao hơn nên có nhiều ưu thế trong chế tạo cảm biến khí.

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