Metallic-Enriched Single-Walled Carbon Nanotubes for Electronics Applications. Erik H. Hároz NASA-Rice Nanotechnology Forum May 18, 2010. a 2. Single-Walled Carbon Nanotubes. a 1. ( n , m ) = (4,2). Chiral vector:. C h = n a 1 + m a 2. n – m = 3 M + q. 1) M = q = 0.
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Erik H. Hároz
NASA-Rice Nanotechnology Forum
May 18, 2010
a Electronics Applications2Single-Walled Carbon Nanotubes
(n,m) = (4,2)
Ch = na1 + ma2
n – m = 3M + q
1) M = q = 0
2) M≠0,q = 0
Narrow Gap Semicond.
3) M≠0,q = ±1
Wide Gap Semicond.
Tans et al., Nature, 386, (1997), 474
Solution: Make samples consisting of all “metallic” SWNTs.
HiPco HPR 188.1 SWNTs suspended in 1% sodium deoxycholate (1mg/mL starting conc.)
Sonicated for about 30 min in bath sonicator, 20 hr in tip sonicator, Decant prepared using 1hr centrifugation @ 200,000g
Run in a 40-20% iodixanol gradient in 1.5% sodium dodecyl sulfate, 1.5% sodium cholate
Centrifugated for 18 hrs @ 200,000g
Starting SWNT material
Results summarized in Hároz et al., ACS Nano4, 1955 (2010).
514 nm excitation
Very little iodixanol