Ghosh, R. , Ghosh, J., Das, R., Mawlong, L. P.L., Paul, K. K. and Giri, P.K. (2018) Multifunctional Ag nanoparticle decorated Si nanowires for sensing, photocatalysis and light emission applications. Journal of Colloid and Interface Science, 532, pp. 464-473. (doi: 10.1016/j.jcis.2018.07.123)
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Abstract
We report on the fabrication of Ag nanoparticle (NP) decorated mesoporous Si nanowire (NW) heterostructure (HS) by a simple and low cost chemical process. The as-grown Si NWs are mesoporous in nature and the Ag NP decorated Si NWs (Ag@Si NWs) exhibit broadband light emission, ultralow reflectance, efficient photocatalytic degradation of organic dyes and excellent sensitivity for the detection of organic molecules over a wide range of concentration. The broadband white light photoluminescence emission from the bare Si NWs is explained on the basis of quantum confinement effect in Si NCs/NWs and the nonbridging oxygen hole center defects in the Sisingle bondSiOx interface. High work function of the noble metal NPs facilitates the effective separation of the photoinduced electron-hole pairs in Si NWs, which enables the Ag@Si NWs to exhibit high photocatalytic efficiency for the degradation of organic dye. The Ag@Si NWs exhibited high potential and sensitivity for the selective and quantitative detection of different organic molecules at extremely low concentration down to 10−12 M by surface-enhanced Raman scattering and 10−11 M by fluorescence-based detection. These versatile properties of the Ag@Si NWs open up opportunities for a variety of energy and environmental applications, such as white light emission, solar cell, artificial photosynthesis, disposal of organic pollutant and bio-chemical sensors etc.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Ghosh, Dr Ramesh |
| Authors: | Ghosh, R., Ghosh, J., Das, R., Mawlong, L. P.L., Paul, K. K., and Giri, P.K. |
| College/School: | College of Science and Engineering > School of Engineering > Biomedical Engineering |
| Journal Name: | Journal of Colloid and Interface Science |
| Publisher: | Elsevier |
| ISSN: | 0021-9797 |
| ISSN (Online): | 1095-7103 |
| Published Online: | 29 July 2018 |
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