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Fabrication of thorny Au nanostructures on polyaniline surfaces for sensitive surface-enhanced Raman spectroscopy
- Source :
- ACS applied materialsinterfaces. 5(1)
- Publication Year :
- 2012
-
Abstract
- Here we demonstrate, for the first time, the fabrication of Au nanostructures on polyaniline (PANI) membrane surfaces for surface enhanced Raman spectroscopy (SERS) applications, through a direct chemical reduction by PANI. Introduction of acids into the HAuCl(4) solution leads to homogeneous Au structures on the PANI surfaces, which show only sub-ppm detection levels toward the target analyte, 4-mercaptobenzoic acid (4-MBA), because of limited surface area and lack of surface roughness. Thorny Au nanostructures can be obtained through controlled reaction conditions and the addition of a capping agent poly (vinyl pyrrolidone) (PVP) in the HAuCl(4) solution and the temperature kept at 80 °C in an oven. Those thorny Au nanostructures, with higher surface areas and unique geometric feature, show a SERS detection sensitivity of 1 × 10(-9) M (sub-ppb level) toward two different analyte molecules, 4-MBA and Rhodamine B, demonstrating their generality for SERS applications. These highly sensitive SERS-active substrates offer novel robust structures for trace detection of chemical and biological analytes.
- Subjects :
- Materials science
Nanostructure
Aniline Compounds
Rhodamines
Substrate (chemistry)
Metal Nanoparticles
Povidone
Nanotechnology
Surface-enhanced Raman spectroscopy
Spectrum Analysis, Raman
Benzoates
chemistry.chemical_compound
Membrane
chemistry
Polyaniline
Surface roughness
Rhodamine B
Molecule
General Materials Science
Gold
Sulfhydryl Compounds
Subjects
Details
- ISSN :
- 19448252
- Volume :
- 5
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- ACS applied materialsinterfaces
- Accession number :
- edsair.doi.dedup.....b72d9eb39ac6efa313dce616001b31b4