NÂNG CAO ĐẶC TÍNH NHẠY KHÍ Ở NHIỆT ĐỘ PHÒNG CỦA CẢM BIẾN KHÍ NH3 DỰA TRÊN VẬT LIỆU TỔ HỢP NANO CÁC BON VÀ HẠT NANO ZnO

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Tác giả: Vũ Trường Dương, Hữu Lâm Nguyễn, Quang Thành Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2023

Mô tả vật lý: tr.318 - 326

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ID: 337085

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Do nhu cầu cần cảm biến nhạy khí NH3 có đặc tính nhạy khí tốt, hoạt động ở nhiệt độ phòng, chúng tôi đã chế tạo cảm biến kiểu điện trở dựa trên vật liệu tổ hợp của ôxit ZnO và vật liệu nano các bon (ống nano các bon - CNT, graphene ôxit - GO). Trong đó, CNT được tổng hợp bằng phương pháp bốc bay lắng đọng pha hơi hóa học, GO được tổng hợp bằng phương pháp Hummers, ZnO được tổng hợp bằng phương pháp sol-gel. Cấu trúc của các vật liệu và tổ hợp vật liệu được khảo sát thông qua ảnh hiển vi điện tử quét phát xạ trường và phổ Raman. Tính chất nhạy với khí NH3 của các cảm biến với tỉ lệ các thành phần của vật liệu tổ hợp được khảo sát ở nồng độ 60 ppm. Kết quả cho thấy các cảm biến dựa trên vật liệu tổ hợp đều cho độ đáp ứng cao hơn so với cảm biến dựa trên vật liệu thuần. Đặc biệt, với vật liệu tổ hợp CNT/GO/ZnO cho độ đáp ứng tốt, lên tới 17,3%, thời gian đáp ứng và thời gian hồi phục cải thiện đáng kể tương ứng là 40s và 70s. Cơ chế nhạy khí dựa trên chuyển tiếp p- n giữa vật liệu nano các bon và ZnO là nguyên nhân tăng cường đặc tính nhạy khí của cảm biến dựa trên vật liệu tổ hợp.Due to the necessity to have NH3 gas sensors with good gas-sensitivity properties, operating at room temperature, we fabricated the resistive sensor based on ZnO and nano carbon (carbon nanotubes - CNT, graphene oxide - GO) composite. In which, CNT was synthesized by chemical vapor deposition, GO was synthesized by Hummers’s method, and ZnO was synthesized by sol-gel method. The structures of the pure and composite materials were investigated by field emission scanning electron microscopy and Raman spectroscopy. The NH3 sensitivity of the sensors to the proportions of the composites was investigated a concentration of 60 ppm. The results show that the sensors based on composite have a higher response than the pure materials. In particular, the sensor based on the CNT/GO/ZnO composite had the best response that was 17.3%, and the response time and recovery time are significantly improved respectively by 40s and 70s. The gas-sensitization mechanism based on the p-n transition between carbon nanomaterials and ZnO is responsible for enhancing the gas-sensitivity characteristics of composite-based sensors.

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