期刊
MATERIALS
卷 10, 期 12, 页码 -出版社
MDPI AG
DOI: 10.3390/ma10121351
关键词
ZnO nanorods; Ag nanoparticles; microwave synthesis; cardboard substrates; SERS
类别
资金
- FEDER funds through the COMPETE Programme
- National Funds from FCT (Portuguese Foundation for Science and Technology) [BPD/76992/2011, BD/85587/2012, BPD/84215/2012, POCI-01-0145-FEDER-007688, UID/CTM/50025/2013]
- Project DISERTOX [PTDC/CTM-NAN/2912/2014]
In the present study, zinc oxide (ZnO) nanorods (NRs) with a hexagonal structure have been synthesized via a hydrothermal method assisted by microwave radiation, using specialized cardboard materials as substrates. Cardboard-type substrates are cost-efficient and robust paper-based platforms that can be integrated into several opto-electronic applications for medical diagnostics, analysis and/or quality control devices. This class of substrates also enables highly-sensitive Raman molecular detection, amiable to several different operational environments and target surfaces. The structural characterization of the ZnO NR arrays has been carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical measurements. The effects of the synthesis time (5-30 min) and temperature (70-130 degrees C) of the ZnO NR arrays decorated with silver nanoparticles (AgNPs) have been investigated in view of their application for surface-enhanced Raman scattering (SERS) molecular detection. The size and density of the ZnO NRs, as well as those of the AgNPs, are shown to play a central role in the final SERS response. A Raman enhancement factor of 7 x 10(5) was obtained using rhodamine 6 G (R6G) as the test analyte; a ZnO NR array was produced for only 5 min at 70 degrees C. This condition presents higher ZnO NR and AgNP densities, thereby increasing the total number of plasmonic hot-spots, their volume coverage and the number of analyte molecules that are subject to enhanced sensing.
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