Ultrasensitive determination of nitrite based on electrochemical platform of AuNPs deposited on PDDA-modified MXene nanosheets

• Published in: Talanta (Oxford) 2021-01, Vol.221, p.121605-121605, Article 121605
• Main Authors: Wang, Yuhuan, Zeng, Zhixing, Qiao, Jianyu, Dong, Shuqing, Liang, Qing, Shao, Shijun
• Format: Article
• Language: English
• Subjects: Electrochemical sensor; Electrodeposition; Gold nanoparticles; Nitrite; Poly(dimethyl diallyl ammonium chloride); Ti3C2Tx MXene
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2020.121605

An ultrasensitive and high-performance electrochemical nitrite sensing platform based on gold nanoparticles deposited on poly (dimethyl diallyl ammonium chloride)-decorated MXene (Ti3C2Tx) (AuNPs/Ti3C2Tx-PDDA) was constructed. AuNPs/Ti3C2Tx-PDDA on the surface of electrode displayed synergetic catalytic effect for oxidizing NO2‾ originating from especially catalytic activity of AuNPs, large area and excellent conductivity of Ti3C2Tx, as well as electrostatic interaction of PDDA. The amperometry technique was employed for quantitative determination of nitrite, in which the AuNPs/Ti3C2Tx-PDDA/GCE sensing platform showed outstanding linear relationship in 0.1–2490 μM and 2490–13490 μM for nitrite, meanwhile the detection limit of 0.059 μM. Besides, the prepared sensor possessed high sensitivity of 250 μA mM−1 cm−2 yet excellent selectivity, stability and reproducibility. Furthermore, this platform also exhibited satisfactory feasibility of nitrite sensing in running water and ham sausage sample. This work would broaden a facile approach to construct high sensitivity electrochemical sensing platform via two-dimension materials and its nanocomposites. [Display omitted] •The AuNPs/Ti3C2Tx-PDDA/GCE sensing platform was proposed for detecting nitrite.•PDDA was used to functionalize Ti3C2Tx, improving detecting sensitivity.•AuNPs/Ti3C2Tx-PDDA displayed synergetic catalytic effect for oxidizing NO2‾.•High sensitivity of 250 μA mM−1 cm−2 and low detecting limit of 0.059 μM.•The sensor can be used for detecting nitrite in food and environment samples.