NGHIÊN CỨU CHẾ TẠO VẬT LIỆU GRAPHEN TỪ GRAPHIT BẰNG THIẾT BỊ RUNG SIÊU ÂM MẬT ĐỘ CÔNG SUẤT LỚN
Viện Khoa học vật liệu, Viện Hàn lâm Khoa học và Công nghệ Việt Nam
Số 18 Hoàng Quốc Việt, Nghĩa Đô, Cầu Giấy, Hà Nội
Số điện thoại: 0985175655; Email: thangbh@ims.vast.ac.vn
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Tóm tắt
PREPARATION OF GRAPHENE FROM GRAPHITE BY HIGH-POWERED DENSITY ULTRASONIC VIBRATION DEVICE
This paper presents an environmentally friendly and efficient method to prepare graphene from graphite, in there a high-powered ultrasonic vibration device is used to separate graphite into graphene in a liquid. During exfoliation, ultrasonic waves provide mechanical energy to break Vander Walls bonds in order to split graphite layers into graphene. Graphene was prepared by the exfoliation of graphite layers in distilled water with Tween 80 surfactant and then the solvent was vibrated at high power for 1 to 5 hours. The obtained results show that high-frequency ultrasound is a powerful tool to break Vander Waals bonding forces between adjacent layers in graphite. The SEM and ZetaSizer distribution results show that with the average size of 931 nm, 419 nm, 411 nm, 408 nm, 317 nm, the ultrasound time is 1 hour, 2 hours, 3 hours, 4 hours, and 5 hours, respectively. The TEM and Raman results show that the graphene material has a thickness of about 3 nm corresponding to the number of layers less than 10 as low-layer graphene. These results show that high-frequency ultrasonic waves not only reduce the average size, but also separate graphite layers, forming graphene.
Từ khóa
Graphene, graphite, exfoliation, ultrasonics, high-powered density, bóc tách, siêu âm, mật độ công suất lớn
Chi tiết bài viết
Tài liệu tham khảo
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