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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Lin, Jiang-Jen Cheng, Wei-Chih Chen, I.-Hui Shiue, Jessie Liu, Ting-Yu Ho, Jun-Ying Wei, Jiun-Chiou Wang, Huai-Hsien Wang, Yuh-Lin Wang, Juen-Kai |
| Copyright Year | 2014 |
| Abstract | Novel nanohybrid arrays of silver (Ag)-on-silicate platelets with flexibility and three-dimensional (3D) hot-junctions (particularly in z-direction) were discovered for improving the stability of free nanoparticles and the mobility of rigid (glass or silicon-based) substrates in surface-enhanced Raman scattering (SERS) detection technology. Since the Ag nanoparticles are adsorbed on both sides of few nanometer-thick silicate platelets (single-layer exfoliated clay), the geometric arrangement of Ag on both sides of the nanoplatelets (Ag/NSP) may induce strong hot-junctions (z-direction) in reference to the pristine montmorillonite clay (multi-layers) at the thickness of ∼20 nm, measured by small molecules (adenine of DNA) and bacteria (S. aureus). Enormous red-shifts (16 nm wavelength difference) were observed between single layer and multi-layer silicate platelets, showing that huge surface plasmon enhancement comes from hot junctions in the z-direction (∼7 times higher than 2D hot-junctions of traditional SERS biochips). Further, the Ag/NSP SERS substrate displays a free floating mobility and optical transparency (less background interference), which inherently increase the contacted surface-area between the substrate and microorganisms, to enhance the SERS sensitivity. The surface modulation with a surfactant could be complimentary towards a variety of microorganisms including hydrophobic microbes, irregular-shaped microorganisms and larger biological cells due to their mutual specific surface interactions. It was anticipated to apply in the rapid detection for varied microbes with label-free and culture-free characterizations. |
| Starting Page | 1136 |
| Ending Page | 1143 |
| Page Count | 8 |
| File Format | HTM / HTML PDF |
| ISSN | 2050750X |
| Volume Number | 2 |
| Issue Number | 9 |
| Journal | Journal of Materials Chemistry B |
| DOI | 10.1039/c3tb21469a |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | SERS Ag Three-dimensional space Surface-enhanced Raman spectroscopy Silicate Clay minerals Montmorillonite Adenine DNA Bacteria Aureus Wavelength Surface plasmon Surfactant Hydrophobe |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Medicine Materials Science Biomedical Engineering |
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