Permanent Trapping of CO(2) in Single-Walled Carbon Nanotubes Synthesized by the HiPco Process

Christopher Matranga; Bradley Bockrath

doi:10.1021/jp0498872

Permanent Trapping of CO(2) in Single-Walled Carbon Nanotubes Synthesized by the HiPco Process

J Phys Chem B. 2004 May 20;108(20):6170-4. doi: 10.1021/jp0498872.

Authors

Christopher Matranga¹, Bradley Bockrath

Affiliation

¹ National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh, Pennsylvania 15236.

PMID: 18950097
DOI: 10.1021/jp0498872

Abstract

Infrared spectroscopy is used to study trapped and physisorbed CO2 in single-walled carbon nanotube bundles (SWNTs) synthesized by the HiPco process. CO2 is entrapped within the SWNTs by acid oxidation of the unpurified sample followed by vacuum heating to 700 K. The trapped CO2 has a single nu3 mode at 2327 cm-1, is stable during temperature cycling from 77 to 700 K, and remains after venting to room air. CO2 physisorption studies show a nu3 mode at 2330 cm-1 for the as-received HiPco samples, 2340 cm-1 for the acid-oxidized sample, and 2327 and 2340 cm-1 for the oxidized sample after vacuum heating. The sites responsible for the infrared peaks of the physisorbed and trapped species are discussed.