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COOH Functionalized Carbon Nanotubes
To carboxyl functionalize our carbon nanotubes (produced by the CVD method), we perform a reflux in concentrated sulfuric / nitric acid. This process results in a large concentration of carboxylic acid COOH groups on the nanotube surface, and also generates other groups. After functionalization, these carboxylated multiwall carbon nanotubes have 2-7 wt% COOH by titration. These typically have a high zeta potential, varying from -30 to -70mV as a function of pH.
We highly recommend our PASTE versions of the COOH terminated nanotubes. Pastes are supplied at 10wt% concentration in water, and are very easy to disperse in other solvents. In contrast, the dried carboxylate powders are less easy to redisperse.

Images below are FTIR, Raman and Zeta Potential Data of our COOH functionalized multiwall nanotubes (PD15L5-20-COOH). Click on the images to view in PDF. More analytical data can be requested via email.
FTIR Spectrum of COOH Functionalized MWCNT     Zeta potential of COOH Functionalized nanotubes   XPS_C   XPS_C
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MSDS for Multiwall & Doublewall Nanotubes     MSDS for SWNT
Catalog No. Description Size, Price Catalog No. Description Size, Price
COOH Functionalized Hollow Multiwall Carbon Nanotubes, purity >95% by TGA
PD15L1-5-COOH OD: 15 ± 5 nm,
Length:1-5 μm
1g, $160 PD15L5-20-COOH OD:15 ± 5 nm
Length:5-20 μm
1g, $130
5g, $750 5g, $600
PD30L1-5-COOH OD:30 ± 15 nm,
Length:1-5 μm
1g, $160 PD30L5-20-COOH OD:30 ± 15 nm
Length:5-20 μm
1g, $130
5g, $750 5g, $600
COOH Functionalized Bamboo Structure Multiwall Carbon Nanotubes, purity >95% by TGA
BPD30L1-5-COOH OD: 30 ± 10 nm
Length: 1-5 μm
1g, $170 BPD30L5-20-COOH OD: 30 ± 10 nm
Length: 5-20 μm
1g, $140
5g, $800 5g, $650
COOH Functionalized Double Wall Carbon Nanotubes DWNT, purity >95% by TGA
D4L1-5-COOH OD: 4 ± 1 nm
Length: 1-5 μm
1g, Backordered D4L5-20-COOH OD: 4 ± 1 nm
Length: 5-20 μm
1g, Backordered
5g, Backordered 5g, Backordered
COOH Functionalized Single Wall Carbon Nanotubes SWNT, purity >95% by TGA
D1.5L1-5-COOH OD: ~1.5 nm
Length: 1-5 μm
1g, Backordered      
5g, Backordered      
Related product:
  • Amide Functionalized Carbon Nanotubes
  • Single Wall Carbon Nanotubes
  • The page was updated on 01/28/2020 nanolab.inc.