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Effects of catalyst thickness on the fabrication and performance of carbon nanotube-templated thin layer chromatography plates
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10.1116/1.4795859
/content/avs/journal/jvstb/31/3/10.1116/1.4795859
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/31/3/10.1116/1.4795859
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) Microfabrication scheme for TLC plates. Surfaces are photolithographically patterned. AlO and Fe are deposited sequentially. The devices then undergo lift-off of the photoresist, leaving a pattern of Fe on AlO, which is followed by CNT growth, infiltration of Si by LPCVD of SiH, and oxidation to remove the CNT framework and convert Si to SiO.

Image of FIG. 2.
FIG. 2.

Representative SEM micrographs of annealed Fe surfaces with initial Fe thicknesses of (a) 4 nm, (b) 6 nm, (c) 8 nm, (d) 10 nm, (e) 12 nm, (f) 14 nm, (g) 16 nm, and (h) 18 nm.

Image of FIG. 3.
FIG. 3.

Diameter, D, of iron nanoparticles as a function of initial Fe film thickness, t. Data points (averages) and error bars (standard deviations) were obtained from three different surfaces annealed under the same conditions—examples of the data used are in Fig. 2 . The fits are D = 6.06 t (solid line, R = 0.95) and D = 7.00 t − 12.15 (dashed line, R = 0.97).

Image of FIG. 4.
FIG. 4.

(Color online) AFM images of annealed Fe surfaces that had initial Fe film thicknesses of (a) 4 nm, (b) 8 nm, (c) 12 nm, and (d) 16 nm.

Image of FIG. 5.
FIG. 5.

Average diameters of CNTs, D, as measured by SEM, as a function of the initial Fe layer thickness, t. Twenty measurements were taken from each of three different images from two different samples. Data points are the averages and error bars are the standard deviations of the data. Fits to lines are (from left to right on the plot): D = 1.25 t + 6.59, R = 0.98, and D = 9.51 t − 110.52, R = 0.99.

Image of FIG. 6.
FIG. 6.

SEM micrographs showing side (left), top (middle), and side (right, at higher magnification) views of CNTs grown from initial Fe catalyst thickness of (a) 6 nm, (b) 8 nm, (c) 10 nm, (d) 12 nm, (e) 14 nm, (f) 16 nm, and (g) 18 nm.

Image of FIG. 7.
FIG. 7.

TEM images of the tops of CNT forests grown with 6 nm of annealed Fe. Catalyst nanoparticles are not seen – they are not embedded or inside the tips of the nanotubes, which suggests “base growth” of CNTs at this t.

Image of FIG. 8.
FIG. 8.

(Color online) Separation of a CAMAG test dye mixture, with toluene as the mobile phase, on TLC plates made with Fe thicknesses of (a) 4 nm, (b) 6 nm, (c) 8 nm, and (d) 10 nm.

Image of FIG. 9.
FIG. 9.

(Color online) Separation of three analgesics (from left to right: caffeine, phenacetine, and propyphenazone) using 4:1 toluene:acetonitrile (v/v) with 0.1% TEA with sample volume of (a) 1.8 l and (b) 3.6 l. The run time was 3:05 min for both plates. The vertical lines on the left and right correspond to the positions of spotting and the solvent front, respectively, where the difference between these points was 3.5 cm on the plates.

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/content/avs/journal/jvstb/31/3/10.1116/1.4795859
2013-04-05
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of catalyst thickness on the fabrication and performance of carbon nanotube-templated thin layer chromatography plates
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/31/3/10.1116/1.4795859
10.1116/1.4795859
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