Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires

Silicon/zinc oxide (Si/ZnO) core-shell nanowires (NWs) were prepared on a p-type Si(111) substrate using a two-step growth process. First, indium seed-coated Si NWs (In/Si NWs) were synthesized using a plasma-assisted hot-wire chemical vapor deposition technique. This was then followed by the growth...

Descripción completa

Detalles Bibliográficos
Autores principales: Chong, Su Kong, Dee, Chang Fu, Abdul Rahman, Saadah
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3637626/
https://www.ncbi.nlm.nih.gov/pubmed/23590803
http://dx.doi.org/10.1186/1556-276X-8-174
_version_ 1782475771377352704
author Chong, Su Kong
Dee, Chang Fu
Abdul Rahman, Saadah
author_facet Chong, Su Kong
Dee, Chang Fu
Abdul Rahman, Saadah
author_sort Chong, Su Kong
collection PubMed
description Silicon/zinc oxide (Si/ZnO) core-shell nanowires (NWs) were prepared on a p-type Si(111) substrate using a two-step growth process. First, indium seed-coated Si NWs (In/Si NWs) were synthesized using a plasma-assisted hot-wire chemical vapor deposition technique. This was then followed by the growth of a ZnO nanostructure shell layer using a vapor transport and condensation method. By varying the ZnO growth time from 0.5 to 2 h, different morphologies of ZnO nanostructures, such as ZnO nanoparticles, ZnO shell layer, and ZnO nanorods were grown on the In/Si NWs. The In seeds were believed to act as centers to attract the ZnO molecule vapors, further inducing the lateral growth of ZnO nanorods from the Si/ZnO core-shell NWs via a vapor-liquid-solid mechanism. The ZnO nanorods had a tendency to grow in the direction of [0001] as indicated by X-ray diffraction and high resolution transmission electron microscopy analyses. We showed that the Si/ZnO core-shell NWs exhibit a broad visible emission ranging from 400 to 750 nm due to the combination of emissions from oxygen vacancies in ZnO and In(2)O(3) structures and nanocrystallite Si on the Si NWs. The hierarchical growth of straight ZnO nanorods on the core-shell NWs eventually reduced the defect (green) emission and enhanced the near band edge (ultraviolet) emission of the ZnO.
format Online
Article
Text
id pubmed-3637626
institution National Center for Biotechnology Information
language English
publishDate 2013
publisher Springer
record_format MEDLINE/PubMed
spelling pubmed-36376262013-05-01 Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires Chong, Su Kong Dee, Chang Fu Abdul Rahman, Saadah Nanoscale Res Lett Nano Express Silicon/zinc oxide (Si/ZnO) core-shell nanowires (NWs) were prepared on a p-type Si(111) substrate using a two-step growth process. First, indium seed-coated Si NWs (In/Si NWs) were synthesized using a plasma-assisted hot-wire chemical vapor deposition technique. This was then followed by the growth of a ZnO nanostructure shell layer using a vapor transport and condensation method. By varying the ZnO growth time from 0.5 to 2 h, different morphologies of ZnO nanostructures, such as ZnO nanoparticles, ZnO shell layer, and ZnO nanorods were grown on the In/Si NWs. The In seeds were believed to act as centers to attract the ZnO molecule vapors, further inducing the lateral growth of ZnO nanorods from the Si/ZnO core-shell NWs via a vapor-liquid-solid mechanism. The ZnO nanorods had a tendency to grow in the direction of [0001] as indicated by X-ray diffraction and high resolution transmission electron microscopy analyses. We showed that the Si/ZnO core-shell NWs exhibit a broad visible emission ranging from 400 to 750 nm due to the combination of emissions from oxygen vacancies in ZnO and In(2)O(3) structures and nanocrystallite Si on the Si NWs. The hierarchical growth of straight ZnO nanorods on the core-shell NWs eventually reduced the defect (green) emission and enhanced the near band edge (ultraviolet) emission of the ZnO. Springer 2013-04-17 /pmc/articles/PMC3637626/ /pubmed/23590803 http://dx.doi.org/10.1186/1556-276X-8-174 Text en Copyright ©2013 Chong et al.; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Nano Express
Chong, Su Kong
Dee, Chang Fu
Abdul Rahman, Saadah
Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires
title Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires
title_full Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires
title_fullStr Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires
title_full_unstemmed Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires
title_short Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires
title_sort structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3637626/
https://www.ncbi.nlm.nih.gov/pubmed/23590803
http://dx.doi.org/10.1186/1556-276X-8-174
work_keys_str_mv AT chongsukong structuralandphotoluminescencestudiesoncatalyticgrowthofsiliconzincoxideheterostructurenanowires
AT deechangfu structuralandphotoluminescencestudiesoncatalyticgrowthofsiliconzincoxideheterostructurenanowires
AT abdulrahmansaadah structuralandphotoluminescencestudiesoncatalyticgrowthofsiliconzincoxideheterostructurenanowires