Carbon Nanotube Thread Electrochemical Cell: Detection of Heavy Metals.
Anal Chem
; 89(18): 9654-9663, 2017 09 19.
Article
em En
| MEDLINE
| ID: mdl-28816040
ABSTRACT
In this work, all three electrodes in an electrochemical cell were fabricated based on carbon nanotube (CNT) thread. CNT thread partially insulated with a thin polystyrene coating to define the microelectrode area was used as the working electrode; bare CNT thread was used as the auxiliary electrode; and a micro quasi-reference electrode was fabricated by electroplating CNT thread with Ag and then anodizing it in chloride solution to form a layer of AgCl. The Ag|AgCl coated CNT thread electrode provided a stable potential comparable to the conventional liquid-junction type Ag|AgCl reference electrode. The CNT thread auxiliary electrode provided a stable current, which is comparable to a Pt wire auxiliary electrode. This all-CNT thread three electrode cell has been evaluated as a microsensor for the simultaneous determination of trace levels of heavy metal ions by anodic stripping voltammetry (ASV). Hg2+, Cu2+, and Pb2+ were used as a representative system for this study. The calculated detection limits (based on the 3σ method) with a 120 s deposition time are 1.05, 0.53, and 0.57 nM for Hg2+, Cu2+, and Pb2+, respectively. These electrodes significantly reduce the dimensions of the conventional three electrode electrochemical cell to the microscale.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cobre
/
Nanotubos de Carbono
/
Técnicas Eletroquímicas
/
Chumbo
/
Mercúrio
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Anal Chem
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Estados Unidos