The Effects of Native Oxides on the Selective Photo-Reduction Property of Cu Nanoparticles Induced by the Localized Surface Plasmon
Copper nanoparticles (CuNPs) in air are easily oxidized into CuNPs@Cu 2 O core–shell structure. The localized surface plasmon resonance (LSPR) of CuNPs can be damped seriously by the Cu 2 O shell. The effect of this native Cu 2 O layer on the LSPR-induced selective photocatalysis properties of CuNPs...
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Published in | Plasmonics (Norwell, Mass.) Vol. 18; no. 1; pp. 73 - 82 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.02.2023
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Copper nanoparticles (CuNPs) in air are easily oxidized into CuNPs@Cu
2
O core–shell structure. The localized surface plasmon resonance (LSPR) of CuNPs can be damped seriously by the Cu
2
O shell. The effect of this native Cu
2
O layer on the LSPR-induced selective photocatalysis properties of CuNPs is often ignored. In this paper, this effect was explored by comparison of the evolution of the photo-reduction efficiency (PRE) with the nanoparticle size (
d
) of the as-deposited CuNPs to that of AgNPs via monitoring the transformation from 4-nitrothiophenol (PNTP) to 4,4 trdimercaptoazobenzene (DMAB) using surface enhanced Raman scattering. It was found that the PRE of the as-deposited CuNPs increases first and then decreases with increasing
d
, much different from that of AgNPs: increases with increasing
d
. Based on the transmission electron microscope images, X-ray photoelectron spectroscopy, and by monitoring the PRE stability in air of the as-deposited CuNPs, the mechanisms of the PRE evolution with
d
and the laser illumination time (
t
) were suggested. Cu
2
O plays a dominated role when the nanoparticles’ sizes were small. Both Cu
2
O and CuNPs play roles when the nanoparticles’ sizes were large, which brought in the low PRE of the as-deposited CuNPs. |
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ISSN: | 1557-1955 1557-1963 |
DOI: | 10.1007/s11468-022-01689-6 |