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Si OCN Functionalized Carbon Nanotube Gas Sensors for Elevated Temperature Applications
Author(s) -
Karakuscu Aylin,
Hu LungHao,
Ponzoni Andrea,
Baratto Camilla,
Ceccato Riccardo,
Sberveglieri Giorgio,
Raj Rishi
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13396
Subject(s) - surface modification , carbon nanotube , materials science , conductance , chemical engineering , silicon , coating , ceramic , nanotechnology , conductivity , chemistry , composite material , optoelectronics , engineering , mathematics , combinatorics
Silicon Oxycarbonitride (Si OCN ) functionalization is proposed for stable, reproducible, reliable, and enhanced gas‐sensing properties in carbon nanotube ( CNT ) gas sensors. The process is very simple: liquid precursor completely coats the surfaces of the CNT s without requiring any surface modification and a thin layer of semiconductor ceramic Si OCN is created on the CNT s after heat treatment. This new kind of conductometric gas sensors can detect 10 ppm NH 3 and 2 ppm NO 2 at temperatures up to 350°C. The stability of the functionalized CNT sensor is verified up to 520°C, while the CNT sensor without the Si OCN coating lost conductance after 250°C due to the structural modification. SiOCN functionalization of CNT changes the recovery from irreversible to reversible and the recovery time decreases from 60 min at 100°C to 19 min at 350°C.