Highly Stabilized β-Carotene in Carbon Nanotubes


  • K.Y. acknowledges a Grand-in-Aid from the Advanced Technology Institute Foundation and The Sumitomo Foundation (Grant No. 050 645). This study was supported in part by the Industrial Technology Research Grant Program in '03 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan.


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Encapsulation of β-carotene inside single-walled carbon nanotubes (SWCNTs) greatly improves the stability of β-carotene. The Figure shows a schematic illustration of β-carotene inside a SWCNT. The surrounding tube wall protects β-carotene from reacting with radical species and suppresses its isomerization. This protection counters the degradation of π-conjugated molecules, which is a bottleneck impeding their application in photonic devices.