Fundamental aspects of adsorption on individual carbon nanotubes

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Fundamental aspects of adsorption on individual carbon nanotubes David Cobden, Department of Physics, University of Washington Interactions between gases and carbon nanotubes have many potential applications in sensing. We fabricated vibrating yoctobalances from individual single-walled nanotubes, capable of single-atom sensitivity (<10-24 kg), to investigate the adsorption of gases and its interplay with electrical properties in a direct and precise way. At temperatures around 77 K we find that noble gases form cylindrical adsorbed monolayers which exhibit dramatic phase transitions. We also see evidence for adsorption in the 1-dimensional grooves between nanotubes, and surprising changes in the conductance on adsorption. f0 = resonance freq Kr on a single nanotube Vg = 8 V incommensurate solid 2D liquid commensurate solid transition phase 2D vapor I The nanotube yoctobalance nanotube Pt 2 mm trench p, T gate electrode - Vac d s current grayscale = vibration amplitude 40 120 drive frequency (MHz) dc gate voltage (tension) -10 +10 resonance Ar on a pair of nanotubes monolayer forming atoms binding in groove