Organic thin film transistors as selective sensing platforms for Hg2+ ions and the amino acid cysteine

Mohan Ramesh, Hong-Cheu Lin*, Chih Wei Chu

*Corresponding author for this work

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

摘要

In this short communication we report a sensor for divalent mercuric (Hg2+) ions that we constructed from a perylene bisimide (PBI)-based organic thin film transistor. We improved the performance of the n-channel device by positioning N,N'-dioctyl-3,4,9,10-perylenedicarboximide between the dielectric and the active layer (PBI), increasing the electron mobility (μ) from 0.002 to 0.25±0.04cm2V-1s-1 and enhancing the on/off ratio (Ion/Ioff) by two orders of magnitude (from 102 to 104). Based on a "thymine-Hg2+-thymine" mechanism and monitoring the shift in the threshold voltage (Vth), we used this transistor to discriminate Hg2+ ions from mixed ion solutions and it extended to different concentration Hg2+ solutions (from 50 to 350μM). By monitoring the shifts in drain current (IDS) and Vth, we also used this bilayer device as a sensor for cysteine, a thiol-containing amino acid; the selective detection of cysteine was accompanied by a red shift in the fluorescence maximum of PBI, from 532 to 537nm.

原文English
頁(從 - 到)76-79
頁數4
期刊Biosensors and Bioelectronics
42
發行號1
DOIs
出版狀態Published - 5 四月 2013

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