Diameter and metallicity dependent redox influences on the separation of single-wall carbon nanotubes.

摘要: Recently, it has become possible to separate and/or enrich fractions of single-wall carbon nanotubes (SWNTs) according type (or otherwise termed “metallicity”) and diameter (dt). Exposure acid-treated SWNTs amines shown such separation. In this contribution, we describe the underlying mechanism for separation provide a better description physicochemical properties charge-stabilized SWNT dispersions in polar aprotic media, as N,N-dimethylformide (DMF). With establishment reversible nature redox chemistry, SWNTn+ + (n/2)H2O ⇌ nH+ (n/4)O2, amine-induced pH changes well variations H2O O2 concentration DMF are cause differential partial-reduction trends dt metallicity. At 10, (n,m)-SWNTs that resist complete reduction their undoped state remain suspension while rest lose charges populate precipitate. These dt- metallicity-dependent mo...