Dataset Information

Efficient Photocatalysts Made by Uniform Decoration of Cu₂O Nanoparticles on Si Nanowire Arrays with Low Visible Reflectivity.

ABSTRACT: Highly uniformed decorations of Cu₂O nanoparticles on the sidewalls of silicon nanowires (SiNWs) with high aspect ratio were prepared through a two-step electroless deposition at room temperature. Morphology evolutions and photocatalytic performance of SiNWs decorated with aggregated and dispersed Cu₂O nanoparticles were unveiled, and the correlated photodegradation kinetics was identified. In comparison with the conventional direct loadings where the aggregated Cu₂O/SiNW structures were created, the uniform incorporation of Cu₂O with SiNWs exhibited more than three and nine times of improved photodegradation efficiency than the aggregated-Cu₂O/SiNWs and sole SiNWs, respectively.

SUBMITTER: Tang CH

PROVIDER: S-EPMC6172162 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Efficient Photocatalysts Made by Uniform Decoration of Cu2O Nanoparticles on Si Nanowire Arrays with Low Visible Reflectivity.

Tang Chien-Hsin CH Hsiao Po-Hsuan PH Chen Chia-Yun CY

Nanoscale research letters 20181004 1

Highly uniformed decorations of Cu2O nanoparticles on the sidewalls of silicon nanowires (SiNWs) with high aspect ratio were prepared through a two-step electroless deposition at room temperature. Morphology evolutions and photocatalytic performance of SiNWs decorated with aggregated and dispersed Cu2O nanoparticles were unveiled, and the correlated photodegradation kinetics was identified. In comparison with the conventional direct loadings where the aggregated Cu2</s ...[more]

PMID: 30288628

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Project description:The combination of metal-assisted chemical etching (MACE) with colloidal lithography has emerged as a simple and cost-effective approach to nanostructure silicon. It is especially efficient at synthesizing Si micro- and nanowire arrays using a catalytic metal mesh, which sinks into the silicon substrate during the etching process. The approach provides a precise control over the array geometry, without requiring expensive nanopatterning techniques. Although MACE is a high-throughput solution-based approach, achieving large-scale homogeneity can be challenging because of the instability of the metal catalyst when the experimental parameters are not set appropriately. Such instabilities can lead to metal film fracture, significantly damaging the substrate and thus compromising the nanowire array quality. Here, we report on the critical parameters that influence the stability of the metal catalyst layer for achieving large-scale homogeneous MACE: etchant composition, metal film thickness, adhesion layer thickness, nanowire diameter and pitch, metal film coverage, Si/Au/etchant interface length, and crystalline quality of the colloidal template (grain size and defects). Our results investigate the origin of the catalyst film fracture and reveal that MACE experiments should be optimized for each Si wire array geometry by keeping the etch rate below a certain threshold. We show that the Si/Au/etchant interface length also affects the etch rate and should thus be considered when optimizing the MACE experimental parameters. Finally, our results demonstrate that colloidal templates with small grain sizes (i.e., <100 μm2) can yield significant problems during the pattern transfer because of a high density of defects at the grain boundaries that negatively affects the metal film stability. As such, this work provides guidelines for the large-scale synthesis of Si micro- and nanowire arrays via MACE, relevant for both new and experienced researchers working with MACE.

Dataset Information

Efficient Photocatalysts Made by Uniform Decoration of Cu₂O Nanoparticles on Si Nanowire Arrays with Low Visible Reflectivity.

Publications

Efficient Photocatalysts Made by Uniform Decoration of Cu<sub>2</sub>O Nanoparticles on Si Nanowire Arrays with Low Visible Reflectivity.

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