Open AccessMicrofluidic chip with interdigitated ultra‐microelectrode array for total phosphorus detection
Author(s) -
Bai Yin,
Tong Jianhua,
Sun Jizhou,
Li Yang,
Bian Chao,
Xia Shanhong
Publication year - 2014
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2014.0391
Subject(s) - microelectrode , multielectrode array , microfluidics , materials science , microfluidic chip , chip , nanotechnology , lab on a chip , optoelectronics , chemistry , electrode , electrical engineering , engineering
The fabrication and characterisation of an integrated microfluidic chip for phosphate detection are described. A micro three‐electrode‐system embedded in a microfluidic channel was used for the analysis of samples. Working electrodes and counter electrodes were arranged as an interdigitated array to increase the current response. Owing to the nonlinear diffusion effect of ultra‐microelectrodes and the high generation‐collection mode of interdigitated electrode arrays, the current density and sensitivity of phosphate detection were improved effectively compared with normal disk microelectrodes. The current density sensitivity for phosphate detection is −0.00537 μA/mm 2 ·(μmol/l) −1 , which is three times that of the disk microelectrode. The current density was averagely 6.5 times that of the disk microelectrode. The microfluidic chip was then used for total phosphorus (TP) detection. The TP detection results showed good consistency with nominal values of standard solutions.