| Info. | Vol.7 - No.3 (2013.09.20) |
|---|---|
| Title | Spatial deformation of nanocellulose hydrogel enhances SERS |
| Authors | Minsung Park1,??/sup>, Hyejin Chang2,??/sup>, Dae Hong Jeong2 & Jinho Hyun1 |
| Institutions | 1Department of Biosystems and Biomaterials Science and
Engineering, Seoul National University, Seoul 151-921, Korea 2Department of Chemistry Education, Seoul National University, Seoul 151-742, Korea |
| Abstract | Bacterial cellulose hydrogels containing gold nanoparticles (AuNPs-BC) were prepared using a cost-effective and environment-friendly in situ synthesis method. Well-dispersed AuNPs were grown on the nanofiber surface of the BC hydrogel, forming substrates of surface-enhanced Raman spectroscopy (SERS). Increases in SERS-active sites in the AuNPs- BC hydrogel caused the enhancement of SERS intensity. The enhancement in SERS intensity of 4-fluorobenzenethiol and phenylacetic acid (PAA), used as test analytes, was compared with spatially-un-deformed AuNPs-BC hydrogels, as well as spatially-deformed AuNPs-BC hydrogels in which the BC layers had contracted during drying. Particularly noteworthy was the detection of PAA by the simple contraction of the substrate, despite a low affinity to surface gold. |
| Keyword | Bacterial cellulose, Gold nanoparticles, Hydrogel, Three-dimensional substrate, Surface-enhanced Raman spectroscopy, SERS hot spot |
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