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Ag-modified silicon nanowires substrate for ultrasensitive surface-enhanced raman spectroscopy.
- Source :
-
Applied Physics Letters . 12/8/2008, Vol. 93 Issue 23, p233118. 3p. 1 Black and White Photograph, 1 Graph. - Publication Year :
- 2008
-
Abstract
- We report a unique substrate for surface-enhanced raman spectroscopy (SERS) based on silver nanoparticles-embedded silicon nanowires (SiNWs). The SiNWs were prepared by thermal evaporation of SiO powder via oxide-assisted growth, oxide removed with HF, and then used to reduce silver ions to form a highly decorated Ag-embedded surface. Such modified SiNWs substrates yielded ultrahigh SERS sensitivity, which could detect 25 μl of 1×10-16M Rhodamine 6G, 1×10-16M crystal violet, and 1×10-14M nicotine in methanol solutions. An Ag-modified SiNW strand could also enable SERS detection of 25 μl of 1×10-8 mg/ml calf thymus DNA. The possible mechanisms for the ultrahigh SERS sensitivity were discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 93
- Issue :
- 23
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 35886517
- Full Text :
- https://doi.org/10.1063/1.2969292