Fast patterning of oriented organic microstripes for field-effect ammonia gas sensors

Binghao Wang, Jinqiang Ding, Tao Zhu, Wei Huang, Zequn Cui, Jianmei Chen, Lizhen Huang*, Lifeng Chi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A series of organic field-effect transistors (OFETs) with patterned ultra-thin films for NH3 detection are achieved via fast dip-coating. The morphology and packing structure of the ultra-thin films are greatly dependent on the surface energy of the substrates, geometry features of the patterned electrodes and evaporation atmosphere during the dip-coating process, which in turn results in a significant difference in the NH3 sensing properties. Based on the newly proposed mechanism, low-trap dielectric-semiconductor interfaces, a stripe-like morphology and an ultrathin film (as low as 2 nm) enable the OFET-based sensors to exhibit unprecedented sensitivity (∼160) with a short response/recovery time. The efficient (2 mm s-1), reliable, and scalable patterning strategy opens a new route for solution-processed OFET-based gas sensors.

Original languageEnglish (US)
Pages (from-to)3954-3961
Number of pages8
JournalNanoscale
Volume8
Issue number7
DOIs
StatePublished - Feb 21 2016

ASJC Scopus subject areas

  • Materials Science(all)

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