A Palladium-Tin Modified Microband Electrode Array for Nitrate Determination

Sensors

Yexiang Fu¹  Chao Bian¹  Jian Kuang¹  Jinfen Wang¹  Jianhua Tong¹  Shanhong Xia¹ 

[1] State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China; E-Mails:

关键词: nitrate determination;    bimetallic composite;    palladium-tin coexistence;    electrodeposition;    microband electrode array;   

DOI  :  10.3390/s150923249

来源: mdpi

【 摘 要 】

A microband electrode array modified with palladium-tin bimetallic composite has been developed for nitrate determination. The microband electrode array was fabricated by Micro Electro-Mechanical System (MEMS) technique. Palladium and tin were electrodeposited successively on the electrode, forming a double-layer structure. The effect of the Pd-Sn composite was investigated and its enhancement of catalytic activity and lifetime was revealed. The Pd-Sn modified electrode showed good linearity (R² = 0.998) from 1 mg/L to 20 mg/L for nitrate determination with a sensitivity of 398 μA/(mg∙L⁻¹∙cm²). The electrode exhibited a satisfying analytical performance after 60 days of storage, indicating a long lifetime. Good repeatability was also displayed by the Pd-Sn modified electrodes. The results provided an option for nitrate determination in water.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.