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Carbon‐nanotube‐based flexible devices using a mechanical transfer method
Author(s) -
Lee Kyongsoo,
Ju ByeongKwon
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228171
Subject(s) - polydimethylsiloxane , materials science , carbon nanotube , fabrication , field electron emission , bending , adhesive , nanotechnology , bend radius , transfer printing , bent molecular geometry , radius , composite material , optoelectronics , deposition (geology) , medicine , alternative medicine , physics , computer security , pathology , quantum mechanics , layer (electronics) , computer science , electron , paleontology , sediment , biology
We describe a new method for the manufacture of single‐walled carbon nanotube (SWCNT)‐based electrical devices on flexible substrates. The method involves the deposition of a SWCNT films onto polydimethylsiloxane (PDMS) substrates from rigid substrates using the adhesive property of PDMS. This method is similar to the conventional dry transfer method, which is based on surface‐energy modification, except that our method involves mechanical transfer using the adhesive property of PDMS under peculiar conditions. The gas‐sensing characteristics of the resulting transferred SWCNT films are presented, showing, for example, that typical flexible sensors exhibit a sensitivity of 17.4% for 4‐ppm NO 2 in a vacuum at room temperature. The performances of the devices are slightly reduced when they are bent to a curved profile with a bending radius of 2 cm (15.9%). The field‐emission properties are also investigated. From these emitters, the SWCNTs can be turned on with a field as low as 0.9 V/µm, and an emission current density of 0.75 mA/cm 2 at 1.2 V/µm can be attained. Thus, a method for the fabrication of flexible devices is established, which should find practical applications in electronic devices.