化学
检出限
非阻塞I/O
吸附
异质结
糠醛
滤纸
化学工程
纳米技术
光电子学
色谱法
催化作用
有机化学
材料科学
工程类
作者
Yu Lei,Yaoyang Xia,Changding Wang,Mingliang Wang,Ruiqi Liu,Shufan Li,Sida Zhang,Qiuxia Sun,Weigen Chen,Fu Wan
出处
期刊:Talanta
[Elsevier]
日期:2023-06-17
卷期号:265: 124796-124796
被引量:7
标识
DOI:10.1016/j.talanta.2023.124796
摘要
Evaluating the transformer aging state and detecting multi-aging characteristics in transformer oil with high sensitivity and fast speed has become a key challenge. This study introduces a P–N heterojunction (CNTs@NiO-α-Fe2O3) fabricated through electroless nickel plating and a one-step hydrothermal method. Additionally, silver nanoparticles (AgNPs) with adjustable particle sizes are grown on the surface using a chemical reduction method. To obtain high sensitivity and rapid SERS signal, CNTs@NiO-α-Fe2O3–Ag gel is adsorbed on a disposable needle filter (220 nm) surface, and 4-aminothiophene (4-ATP) is grafted onto the surface of SERS substrate. The minimum detection limit was 0.025 mg/L (EF = 5.22 × 104), and the response time of SERS best signal could be shortened to 3 min. Density functional theory (DFT) calculations reveal that by constructing a P–N heterostructure of NiO–Fe2O3 and assessing the adsorption energies of furfural, acetone, and methanol on the surface of the P–N heterojunction. This SERS strategy has a huge application prospect in the aging diagnosis of oil-paper insulation systems in a transformer.
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