title: In situ XAFS experiments using a microfluidic cell: application to initial growth of CdSe nanocrystals.
abstract: The design and performance of a compact fluorescense XAFS apparatus equipped with a microfluidic cell for in situ studies of nanoparticles are described. CdSe nanoparticles were prepared by solution reaction starting from trioctylphosphine-Se. Time-resolved experiments were performed by precisely controlling the reactor coordinates (x,y), allowing the synchrotron X-ray beam to travel along a reactor channel, covering nucleation and initial growth of nanoparticles. Detailed analysis of EXAFS data combined with UV-vis spectra allow reliable estimation of particle size and density in the initial growth that cannot be accessible by conventional optical techniques based on a long-range order. The Se K-XANES spectra are interpreted by multi-scattering calculations providing bond formation kinetics consistent with the EXAFS data.
authors.affiliation: Photonics Research Institute, National Institute of Advanced Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan. h.oyanagi@aist.go.jp
authors.forename: H
authors.initials: H
authors.lastname: Oyanagi
authors.forename: Z H
authors.initials: ZH
authors.lastname: Sun
authors.forename: Y
authors.initials: Y
authors.lastname: Jiang
authors.forename: M
authors.initials: M
authors.lastname: Uehara
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
authors.forename: K
authors.initials: K
authors.lastname: Yamashita
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: C
authors.initials: C
authors.lastname: Lee
authors.forename: A
authors.initials: A
authors.lastname: Fukano
authors.forename: H
authors.initials: H
authors.lastname: Maeda