RT Journal Article T1 Nanotube-Like Electronic States in [5,5]-C90 Fullertube Molecules A1 Jover, Óscar A1 Martín Jiménez, Alberto A1 Franklin, Hannah M. A1 Koenig, Ryan M. A1 Martínez, José I. A1 Martín León, Nazario A1 Lauwaet, Koen A1 Miranda, Rodolfo A1 Gallego, José M. A1 Stevenson, Steven A1 Otero, Roberto AB Fullertubes, that is, fullerenes consisting of a carbon nanotube moiety capped by hemifullerene ends, are emerging carbon nanomaterials whose properties show both fullerene and carbon nanotube (CNT) traits. Albeit it may be expected that their electronic states show a certain resemblance to those of the extended nanotube, such a correlation has not yet been found or described. Here it shows a scanning tunneling microscopy (STM) and spectroscopy (STS) characterization of the adsorption, self-assembly, and electronic structure of 2D arrays of [5,5]-C90 fullertube molecules on two different noble metal surfaces, Ag(111) and Au(111). The results demonstrate that the shape of the molecular orbitals of the adsorbed fullertubes corresponds closely to those expected for isolated species on the grounds of density functional theory calculations. Moreover, a comparison between the electronic density profiles in the bands of the extended [5,5]-CNT and in the molecules reveals that some of the frontier orbitals of the fullertube molecules can be described as the result of the quantum confinement imposed by the hemifullerene caps to the delocalized band states in the extended CNT. The results thus provide a conceptual framework for the rational design of custom fullertube molecules and can potentially become a cornerstone in the understanding of these new carbon nanoforms. PB Wiley SN 1613-6810 YR 2023 FD 2023-10-23 LK https://hdl.handle.net/20.500.14352/120317 UL https://hdl.handle.net/20.500.14352/120317 LA eng NO Jover, Ó.; Martín‐Jiménez, A.; Franklin, H. M.; Koenig, R. M.; Martínez, J. I.; Martín, N.; Lauwaet, K.; Miranda, R.; Gallego, J. M.; Stevenson, S.; Otero, R. Nanotube‐Like Electronic States in [5,5]‐C90 Fullertube Molecules. Small 2024, 20 (9), 2307611. https://doi.org/10.1002/smll.202307611. NO Spanish Ministry for Science and Innovation. Grant Numbers: PID2020-113142RB-C21, PLEC2021-007906, PID2021-128011NB-I00, PID2020-114653RB-I00, CEX2020-001039-S, CEX2018-000805-MComunidad de Madrid. Grant Numbers: (MAD2D-CM)-UAM, S2018/NMT-4321, S2018/NMT-4367, Y2020/NMT-6469National Science Foundation. Grant Number: CHE-1856461 NO Ministerio de Ciencia, Innovación y Universidades (España) NO Comunidad de Madrid NO National Science Foundation (USA) DS Docta Complutense RD 26 jun 2025