Copper nanowire array as highly selective electrochemical sensor of nitrate ions in water

TALANTA

卷:221

Article

Patella, B.¹  Russo, R. R.¹  O'Riordan, A.²  Aiello, G.¹  Sunseri, C.¹  Inguanta, R.¹ 

[1] Univ Palermo, Lab Chim Fis Applicata, Dipartimento Ingn, Viale Sci, Palermo, Italy

[2] Univ Coll Cork, Tyndall Natl Inst, Nanotechnol Grp, Dyke Parade, Cork, Ireland

关键词: Electrochemical sensor;    Copper nanowires;    Nitrate ion;    Water contamination;    Galvanic deposition;    Nanostructures;   

DOI  :  10.1016/j.talanta.2020.121643

来源: Elsevier

【 摘 要 】

Contamination of water with nitrate ions is a significant problem that affects many areas of the world. For this reason, European legislation has set the maximum permissible concentration of nitrates in drinking water at 44 mg/L. Thus, it is clear that a continuous monitoring of nitrate ions is of high technological interest but it must be rapid, easy to perform and directly performable in situ. In this work we have developed a nanostructured sensor based on array of copper nanowires obtained with the simple method of galvanic deposition. The nanostructured sensors have a very short response time with a detection limit less than 10 mu M. Different interfering species were tested finding a negligible effect except for the chloride ions. However, this problem has been solved by removing chloride ions from the water through a simple precipitation of chloride compounds with low solubility. Nano structured sensors were also used to analyze real water samples (rain, river and drinking water). In the case of drinking water, we have measured a concentration of nitrate ions very close to the that measured by conventional laboratory techniques.

【 授权许可】

Free