Home About Us Resources Products Services Contact Us You have chosen COOH functionalized doublewall carbon nanotubes produced by CVD method, then functionalized via sulfuric/nitric acid reflux. Purity >95% Outside Diameter:4 ± 1nm Length 1-5 microns SSA 200 - 400 m2/g [back] D4L1-5-COOH-1g$370.00 updated: 03/29/2017