Effect of Graphitization on the Wettability and Electrical Conductivity of CVD-Carbon Nanotubes and Films

Mattia, Davide; Rossi, María Pía; Kim, B M; Korneva, Guzeliya; Bau, Haim H.; Gogotsi, Yury

doi:10.1021/jp061138s

Cited by 196 publications

(186 citation statements)

References 39 publications

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“…4. The positive correlation trend between the sp 2 /sp 3 ratio and annealed temperature is similar to the report by Diaz, Franta and Mattia et al 9,29,32) For contact angle measurement, water has stronger polar component than its disperse component, i.e. the polar/disperse ratio is 2.62 (52.2/19.9) for de-ionized water and is 5.07 (60.3/11.9) for pure water.…”

Section: Resultssupporting

confidence: 89%

Correlation between sp2/sp3 Ratio or Hydrogen Content and Water Contact Angle in Hydrogenated DLC Film

2007

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Water contact angle has been measured to indirectly assess the sp 2 /sp 3 ratio and hydrogen content of DLCH film under post N 2 annealed treatment with O 2 content under 100 ppm. XPS spectrum is used to measure the C1s bonding type and calculate the sp 2 /sp 3 ratio. The surface morphology of DLCH film was examined by SEM and AFM. From experimental results, it seems the surface morphology was not a critical factor on water contact angle value, at least for DLCH film. A quantitative correlation between water contact angle and sp 2 /sp 3 ratio of DLCH film is established from which the hydrogen content can be estimated by the sp 2 /sp 3 ratio as well as Angus equation.

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Section: Resultssupporting

confidence: 89%

Correlation between sp2/sp3 Ratio or Hydrogen Content and Water Contact Angle in Hydrogenated DLC Film

2007

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“…For example, the 670 and 2000°C tubes had, respectively, contact angles of 44°a nd 77°with water. 15,16 The tubes had a nominal diameter of 200-300 nm and a wall thickness of about 15 nm. The actual diameters of the tubes varied and were measured with a scanning electron microscope ͑SEM͒.…”

Section: Methodsmentioning

confidence: 99%

Induction and measurement of minute flow rates through nanopipes

Sinha¹,

Rossi²,

Mattia³

et al. 2007

Physics of Fluids

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"Induction and measurement of minute flow rates through nanopipes" (2007). Departmental Papers (MEAM). 79. http://repository.upenn.edu/meam_papers/79 Induction and measurement of minute flow rates through nanopipes AbstractA simple technique to simultaneously induce fluid flow through an individual nanopipe and measure the flow rate and the pressure difference across the pipe is described. Two liquid drops of different sizes are positioned at the two ends of the nanopipe. Due to the higher capillary pressure of the smaller drop, flow is driven from the smaller drop to the bigger drop. The instantaneous pressures of the two drops are estimated from the drops' shapes and sizes. The flow rate is estimated by monitoring the sizes of the drops as functions of time with a microscope and a video camera. A theory that correlates the drops' sizes and the flow rate is derived. Measurements are carried out with an ionic salt and glycerin to estimate the effective tube radius of the nanopipes with diameters ranging from 200 to 300 nm. The tubes' diameters are independently measured with a scanning electron microscope. The method is also verified by tracking the motion of fluorescent particles through the nanopipe. The paper provides a simple technique for studying extremely low flow rates in nanofluidic systems. When working with low-evaporation fluids such as ionic salts, the measurements can be carried out with an electron microscope. A simple technique to simultaneously induce fluid flow through an individual nanopipe and measure the flow rate and the pressure difference across the pipe is described. Two liquid drops of different sizes are positioned at the two ends of the nanopipe. Due to the higher capillary pressure of the smaller drop, flow is driven from the smaller drop to the bigger drop. The instantaneous pressures of the two drops are estimated from the drops' shapes and sizes. The flow rate is estimated by monitoring the sizes of the drops as functions of time with a microscope and a video camera. A theory that correlates the drops' sizes and the flow rate is derived. Measurements are carried out with an ionic salt and glycerin to estimate the effective tube radius of the nanopipes with diameters ranging from 200 to 300 nm. The tubes' diameters are independently measured with a scanning electron microscope. The method is also verified by tracking the motion of fluorescent particles through the nanopipe. The paper provides a simple technique for studying extremely low flow rates in nanofluidic systems. When working with low-evaporation fluids such as ionic salts, the measurements can be carried out with an electron microscope.

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“…The structure of our carbon tips are similar to carbon pipes synthesized with alumina templates [16].…”

mentioning

confidence: 99%

Carbon nanopipettes for cell probes and intracellular injection

Schrlau¹,

Falls²,

Ziober³

et al. 2007

Nanotechnology

110

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Effect of Graphitization on the Wettability and Electrical Conductivity of CVD-Carbon Nanotubes and Films

Cited by 196 publications

References 39 publications

Correlation between <B>sp</B><SUP><B>2</B></SUP><B>/sp</B><SUP><B>3</B></SUP> Ratio or Hydrogen Content and Water Contact Angle in Hydrogenated DLC Film

Correlation between <B>sp</B><SUP><B>2</B></SUP><B>/sp</B><SUP><B>3</B></SUP> Ratio or Hydrogen Content and Water Contact Angle in Hydrogenated DLC Film

Induction and measurement of minute flow rates through nanopipes

Carbon nanopipettes for cell probes and intracellular injection

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