Highly ordered platinum-nanotube arrays for oxidative determination of trace arsenic(III)

• Published in: Electrochemistry communications 2008-12, Vol.10 (12), p.1893-1896
• Main Authors: Xu, He, Zeng, LiPing, Xing, SuJie, Shi, GuoYue, Chen, Junshui, Xian, YueZhong, Jin, Litong
• Format: Article
• Language: English
• Subjects: Analytical chemistry; Arsenic; Chemistry; Electrochemical methods; Exact sciences and technology; Heavy metals; Highly ordered platinum-nanotube array; Porous anodic alumina template; Voltammetry
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2008.09.037

A novel method for the oxidative determination of trace arsenic(III) was investigated on highly ordered platinum-nanotube array electrodes (PtNTAEs). The PtNTAEs with a highly organized structure were fabricated by electrochemical deposition of platinum in a 3-aminopropyltrimethoxysilane-modified porous anodic alumina template (PAA). The morphologies and structures of PtNTAEs were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electrochemical experiments proved that the PtNTAEs exhibited better performance for As(III) analysis in comparison with platinum nanoparticles-coated GCE (Pt nano/GCE) or Pt foil electrode. The PtNTAEs showed to provide higher reproducibility and lower detection limit. The relative standard deviation (RSD) was 3.5% for 50 repeated measurements of 20 μM As(III), and the limit of detection (LOD) was 0.1 ppb, which was typically 1–2 orders of magnitude lower than that of Pt nano/GCE or Pt foil electrode.