title: Electrical conduction through linear porphyrin arrays.
abstract: Electrical conduction measurements were made on two extreme types of directly linked porphyrin arrays by using nanoelectrodes. One type is the directly linked Zn(II)porphyrin arrays, consisting of 48 Zn(II)porphyrin moieties (Z48), and the other type is the completely flat, tape-shaped Zn(II)porphyrin arrays, consisting of eight Zn(II)porphyrin units (T8). The I-V curve for Z48 exhibits the diode-like behavior and the hysteresis depending on the voltage sweep direction presumably due to the conformational heterogeneity arising from the dihedral angle distribution in Z48. On the other hand, the I-V curve for T8 is nearly symmetric without any hysteresis, leading to the higher conductivity and the smaller band gap. These results illustrate that the stronger pi-electron conjugation in T8, as compared with that of Z48, results in better electrical conduction.
authors.affiliation: Department of Physics, Yonsei University, Seoul 120-742, Korea.
authors.forename: Dae Hwan
authors.initials: DH
authors.lastname: Yoon
authors.forename: Sun Bae
authors.initials: SB
authors.lastname: Lee
authors.forename: K-H
authors.initials: KH
authors.lastname: Yoo
authors.forename: Jinhee
authors.initials: J
authors.lastname: Kim
authors.forename: Jong Kuk
authors.initials: JK
authors.lastname: Lim
authors.forename: Naoki
authors.initials: N
authors.lastname: Aratani
authors.forename: Akihiko
authors.initials: A
authors.lastname: Tsuda
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Osuka
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
mesh_terms: D040761:Biomimetic Materials / Q000737:chemistry; D004553:Electric Conductivity; D008665:Metalloporphyrins / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D008665:Metalloporphyrins; D015032:Zinc