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

Yuhuan Wang; Zhixing Zeng; Jianyu Qiao; Shuqing Dong; Qing Liang; Shijun Shao

doi:10.1016/j.talanta.2020.121605

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

Talanta. 2021 Jan 1:221:121605. doi: 10.1016/j.talanta.2020.121605. Epub 2020 Sep 8.

Authors

Yuhuan Wang¹, Zhixing Zeng¹, Jianyu Qiao¹, Shuqing Dong², Qing Liang³, Shijun Shao⁴

Affiliations

¹ CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu, 730000, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
² CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu, 730000, PR China. Electronic address: sqdong@licp.cas.cn.
³ CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu, 730000, PR China.
⁴ CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu, 730000, PR China. Electronic address: sjshao@licp.cas.cn.

PMID: 33076135
DOI: 10.1016/j.talanta.2020.121605

Abstract

An ultrasensitive and high-performance electrochemical nitrite sensing platform based on gold nanoparticles deposited on poly (dimethyl diallyl ammonium chloride)-decorated MXene (Ti₃C₂T_x) (AuNPs/Ti₃C₂T_x-PDDA) was constructed. AuNPs/Ti₃C₂T_x-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 Ti₃C₂T_x, as well as electrostatic interaction of PDDA. The amperometry technique was employed for quantitative determination of nitrite, in which the AuNPs/Ti₃C₂T_x-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.

Keywords: Electrochemical sensor; Electrodeposition; Gold nanoparticles; Nitrite; Poly(dimethyl diallyl ammonium chloride); Ti(3)C(2)T(x) MXene.