Pyrene-SH functionalized OTFT for detection of Hg2+ ions in aquatic environments

Cut Rullyani, Muthaiah Shellaiah, Mohan Ramesh, Hong-Cheu Lin, Chih Wei Chu*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations


Mercury ion (Hg2+) sensor based on bottom gate top contact organic thin film transistor (OTFT) was fabricated. The OTFT channel area was functionalized with pyrene that contain thiol group, which has strong binding affinity toward Hg2+ ion. The OTFT sensor exhibited a charge mobility of 0.28 cm2 V−1 s−1, a threshold voltage of −22.3 V and on-to-off ratio 103. The sensor shows high selectivity to Hg2+ ion over other two valence metal ions. OTFT sensor exhibited high sensitivity to Hg2+ ion, indicated by increasing of drain current after exposed to different concentration of Hg2+ ion ranging from 1 mM to 0.01 μM. Moreover, the OTFT sensor capability for practical application was also demonstrated by sensing the present of 25 μM of Hg2+ ion in tap, drinking and seawater samples.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalOrganic Electronics
StatePublished - 1 Jun 2019


  • Mercury sensor
  • Organic thin film transistor
  • Pyrene derivative

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