C60/Collapsed Carbon Nanotube Hybrids: A Variant of Peapods Barzegar, Hamid Reza ; Gracia-Espino, Eduardo ; Yan, Aiming ; Ojeda-Aristizabal, Claudia ; Dunn, Gabriel ; Wågberg, Thomas ; Zettl, Alex Abstract Publication: Nano Letters Pub Date: February 2015 DOI: 10.1021/nl503388f Bibcode: 2015NanoL..15..829B