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Extreme Changes in the Electrical Resistance of Titania Nanotubes with Hydrogen Exposure
Author(s) -
Varghese O.K.,
Gong D.,
Paulose M.,
Ong K.G.,
Dickey E.C.,
Grimes C.A.
Publication year - 2003
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200304586
Subject(s) - materials science , nanotube , electrical resistivity and conductivity , hydrogen , electrical resistance and conductance , conductivity , nanotechnology , carbon nanotube , chemical physics , chemical engineering , composite material , chemistry , organic chemistry , electrical engineering , engineering
Extremely sensitive, drift‐free, and robust hydrogen sensors based on titania nanotube arrays (see Figure) are reported. Very large changes in the electrical conductivity of the nanotubes upon exposure to hydrogen gas have been measured, over one order of magnitude greater than the previous record. Dependence of the electrical conductivity on both temperature and nanotube pore size is found.