Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 532, Issue -, Pages 143-152Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.07.080
Keywords
Metal@semiconductor; Heteroepitaxial nanorods; Cation-exchange process; Surface plasmon resonance; Single-particle dark-field scattering; Photocatalytic activity
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Funding
- National Science Council of Taiwan [NSC 102-2221-E-007-023-MY3, NSC 102-2221-E-007-090-MY2, NSC 101-2623-E-007]
- Robert A. Welch Foundation [C-1664]
- Air Force Office of Scientific Research [MURI FA9550-15-1-0022]
- National Science Foundation Graduate Research Fellowship Program [1450681]
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Synthesis of metal@semiconductor heteroepitaxial nanorods fully covered by a semiconductor shell remains challenging due to the large lattice mismatch between the two components. Here, we prepared Au@CdSe heteroepitaxial nanorods by employing pre-growth of Ag2Se as an intermediate layer that favored the formation of a complete CdSe shell via a cation-exchange process. The optical properties of these hybrid nanostructures can be tailored by changing the shell thickness with thicker shells resulting in a redshift of the longitudinal surface plasmon resonance. The resonance energy, intensity, and line width of the longitudinal surface plasmon resonance were measured by single-particle dark-field scattering spectroscopy, confirming significant electron transfer from the Au nanorod to the CdSe shell. In addition, we also studied the dependence of the catalytic reactivity on shell thickness in photocatalysis of methylene blue under UV illumination. These studies revealed that a thinner shell thickness resulted in higher photocatalytic activity. (C) 2018 Published by Elsevier Inc.
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