title: Atomistic nucleation sites of Pt nanoparticles on N-doped carbon nanotubes.
abstract: The atomistic nucleation sites of Pt nanoparticles (Pt NPs) on N-doped carbon nanotubes (N-CNTs) were investigated using C and N K-edge and Pt L3-edge X-ray absorption near-edge structure (XANES)/extended X-ray absorption fine structure (EXAFS) spectroscopy. Transmission electron microscopy and XANES/EXAFS results revealed that the self-organized Pt NPs on N-CNTs are uniformly distributed because of the relatively high binding energies of the adsorbed Pt atoms at the imperfect sites. During the atomistic nucleation process of Pt NPs on N-CNTs, stable Pt-C and Pt-N bonds are presumably formed, and charge transfer occurs at the surface/interface of the N-CNTs. The findings in this study were consistent with density functional theory calculations performed using cluster models for the undoped, substitutional-N-doped and pyridine-like-N-doped CNTs.
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Kwei-Shan, Tao-Yuan 333, Taiwan. sunchialiang@gmail.com
authors.forename: Chia-Liang
authors.initials: CL
authors.lastname: Sun
authors.forename: Chih-Wen
authors.initials: CW
authors.lastname: Pao
authors.forename: Huang-Ming
authors.initials: HM
authors.lastname: Tsai
authors.forename: Jau-Wern
authors.initials: JW
authors.lastname: Chiou
authors.forename: Sekhar C
authors.initials: SC
authors.lastname: Ray
authors.forename: Houng-Wei
authors.initials: HW
authors.lastname: Wang
authors.forename: Michitoshi
authors.initials: M
authors.lastname: Hayashi
authors.forename: Li-Chyong
authors.initials: LC
authors.lastname: Chen
authors.forename: Hong-Ji
authors.initials: HJ
authors.lastname: Lin
authors.forename: Jyh-Fu
authors.initials: JF
authors.lastname: Lee
authors.forename: Li
authors.initials: L
authors.lastname: Chang
authors.forename: Min-Hsiung
authors.initials: MH
authors.lastname: Tsai
authors.forename: Kuei-Hsien
authors.initials: KH
authors.lastname: Chen
authors.forename: Way-Faung
authors.initials: WF
authors.lastname: Pong