In Situ X-ray Absorption Near-Edge Structure Spectroscopy of ZnO Nanowire Growth During Chemical Bath Deposition

Chemical bath deposition (CBD) offers a simple and inexpensive route to deposit semiconductor nanostructures, but lack of fundamental understanding and control of the underlying chemistry has limited its versatility. Here we report the first use of in situ X-ray absorption spectroscopy during CBD, e...

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Bibliographic Details
Published in:Chemistry of materials 2010-11, Vol.22 (22), p.6162-6170
Main Authors: McPeak, Kevin M, Becker, Matthew A, Britton, Nathan G, Majidi, Hasti, Bunker, Bruce A, Baxter, Jason B
Format: Article
Language:English
Subjects:
ABSORPTION
ABSORPTION SPECTROSCOPY
Characterization of Materials
CHEMISTRY
Crystal Growth
DEPOSITION
KINETICS
Nanomaterials (Nanops, Nanotubes, etc.)
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
REACTION KINETICS
SPECTRA
SPECTROSCOPY
UROTROPIN
ZINC NITRATES
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Summary:Chemical bath deposition (CBD) offers a simple and inexpensive route to deposit semiconductor nanostructures, but lack of fundamental understanding and control of the underlying chemistry has limited its versatility. Here we report the first use of in situ X-ray absorption spectroscopy during CBD, enabling detailed investigation of both reaction mechanisms and kinetics of ZnO nanowire growth from zinc nitrate and hexamethylenetetramine (HMTA) precursors. Time-resolved X-ray absorption near-edge structure (XANES) spectra were used to quantify Zn(II) speciation in both solution and solid phases. ZnO crystallizes directly from [Zn(H2O)6]2+ without long-lived intermediates. Using ZnO nanowire deposition as an example, this study establishes in situ XANES spectroscopy as an excellent quantitative tool to understand CBD of nanomaterials.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm102155m