Vu Truong Duong, Cong Tu Nguyen, Huu Bac Luong, Duc Chien Nguyen, Huu Lam Nguyen
School of Engineering Physics, Hanoi University of Science and Technology, Hanoi, 100000, Vietnam.
J Nanosci Nanotechnol. 2019 Nov 1;19(11):7447-7451. doi: 10.1166/jnn.2019.16725.
By electron beam evaporation, noble metals (Au, Co, Pt, and Ag) with 2 and 4 nm nominal thicknesses were coated onto multi-walled carbon nanotube layers. The metals were in the form of nanoparticles mounted onto the side walls of carbon nanotubes (CNTs) to create a metal/CNT junction. The CNTs were directly grown on patterned Pt-electrode alumina substrates through chemical vapor deposition to produce a resistivity-based ammonia gas sensor. The metallic surface-modified CNT-based sensors were found sensitive to NH₃ gas at room temperature. Compared with pristine CNT sensor, the response of Au/CNTs sensor increased slightly, whereas the responses of the Pt/CNTs, Co/CNTs, and Ag/CNTs increased by two, three, and more than four times, respectively.
通过电子束蒸发，将标称厚度为2纳米和4纳米的贵金属（金、钴、铂和银）涂覆在多壁碳纳米管层上。这些金属呈纳米颗粒形式，附着在碳纳米管（CNT）的侧壁上，以形成金属/碳纳米管结。碳纳米管通过化学气相沉积直接生长在图案化的铂电极氧化铝衬底上，以制造基于电阻率的氨气传感器。发现金属表面改性的碳纳米管基传感器在室温下对NH₃气体敏感。与原始碳纳米管传感器相比，金/碳纳米管传感器的响应略有增加，而铂/碳纳米管、钴/碳纳米管和银/碳纳米管的响应分别增加了两倍、三倍和四倍以上。
