title: Optical detection of argon gas flow based on vibration-induced change in photoluminescence of a semiconducting single-walled carbon nanotube bundle.
abstract: In this work, we demonstrate that Ar gas flow can be optically detected using mechanical vibration of a semiconducting single-walled carbon nanotube (SWCNT) bundle as a platform. A change in the photoluminescence (PL) intensity was induced by out-of-focusing of the SWCNT bundle of interest due to vibration caused by the introduced gas stream, for which a gas flow control system was installed in an optical microscope. The PL intensity was found to change systemically with the Ar flow rates in a range of relatively large flow rate intervals [0.70 to 3.0 standard cubic liters per minute (SLM) with 0.1-0.5 SLM intervals] with a noticeable hysteresis. It was, however, difficult to obtain a detectable PL change in a range of very small flow rate intervals (0.67 to 0.70 SLM with a 0.01 SLM interval). The detailed results and underlying mechanism are discussed in detail.
authors.forename: Hong-Seok
authors.initials: HS
authors.lastname: Kim
authors.forename: Woo-Jae
authors.initials: WJ
authors.lastname: Kim
authors.forename: Michael S
authors.initials: MS
authors.lastname: Strano
authors.forename: Jae-Hee
authors.initials: JH
authors.lastname: Hanl
mesh_terms: D001128:Argon / Q000032:analysis*; D049449:Luminescence; D008854:Microscopy, Electron; D037742:Nanotubes, Carbon; D012666:Semiconductors
chemical_list: D037742:Nanotubes, Carbon; D001128:Argon