Chế tạo graphene từ thanh graphite sử dụng phương pháp bóc tách điện hóa dựa vào kỹ thuật thế bậc thang
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Abstract
In this work, graphene (GR) materials were fabricated from natural graphite rods via electrochemical exfoliated approaches with different voltages applied to electrodes, such as constant voltages 6 V, 8 V, 10 V, and staircase potential 0-2 V and 2-10 V in ammonium sulfate (NH4)2SO4 solution. The products were characterized by Zeta potential, field emission-scanning electron microscope (FE-SEM), atomic force microscopy (AFM), and Raman spectroscope (Raman) to examine the characterization and structure of GR. Zeta potential of GR-010 with staircase potential 0-10 V is -47.7 mV, showing the effective dispersion of GR in water due to excellent linked ability with negative ions at the surface and boundary of GR. FE-SEM and AFM images show that the average thickness of GR-010 is 1.8 nm corresponding to 3-5 single-layers, respectively, less than Gr-6, GR-8, and GR-10. Raman image of GR shows that the defect level of GR-010 is lower than GR-6, GR-8, and GR-10 with ratio ID/IG = 0.36.
Tóm tắt
Trong nghiên cứu này, vật liệu graphene (GR) được chế tạo từ thanh graphite sử dụng phương pháp bóc tách điện hóa với các loại điện áp khác nhau đặt vào hai đầu điện cực, bao gồm các điện áp không đổi 6 V, 8 V, 10 V và kỹ thuật thế bậc thang hai giai đoạn từ 0-2 V và 2-10 V trong môi trường ammonium sulfate (NH4)2SO4. Kết quả chế tạo đã được khảo sát bằng các phép đo thế Zeta, kính hiển vi điện tử quét phát xạ trường (FE-SEM), kính hiển vi lực nguyên tử (AFM) và quang phổ Raman để xác định đặc trưng và cấu trúc của vật liệu GR. Thế Zeta thu được của GR-010 có giá trị -47,7 mV cho thấy hiệu quả phân tán trong môi trường nước, hiệu quả này do khả năng liên kết tốt với các ion âm ở bề mặt và biên của GR. Kết quả đo SEM và AFM cũng chỉ ra bề dày trung bình của các tấm GR-010 thu được vào cỡ 1,8 nm tương ứng 3-5 lớp GR, nhỏ hơn so với các mẫu GR-6, GR-8 và GR-10 tương ứng với các điện áp 6 V, 8 V và 10 V. Kết quả phân tích Raman cũng cho thấy mức độ sai hỏng của GR-010 thấp hơn so với GR-6, GR-8 và GR-10 với tỷ số ID/IG = 0,36.
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