Abstract
Biogenic, eco-friendly, reliable, and cost-effective metal nanostructures were synthesized using Trigonella foenum-graecum leaf extract, which acted as reducing and stabilizing agent with no additional chemical surfactants. Nanoparticle formation was confirmed from UV–Vis absorption, XRD, and FTIR spectra. Morphology and crystallinity of spherical silver nanoparticles (Ag NPs) and gold nanoparticles (Au NTs) were further confirmed from TEM analysis. Luminescence enhancement and quenching of lanthanide ion complexes were observed and found to be dependent on metal nanostructure concentration. The factors relay on the energy transfers between nanostructures and rare-earth ions (RE). The nonlinear optical studies of Ag NPs and Au NTs were studied using Z-scan and degenerate four wave mixing (DFWM) techniques with picosecond and femtosecond lasers. The surface-enhanced Raman scattering (SERS) of the test molecule, rhodamine 6G, was studied to check the performance of Ag NPs and Au NTs in enhancing the Raman scattering signals. In vitro cytotoxic effect of the Ag NPs and Au NTs has been checked against A549 lung cancer cell lines and the efficiency of toxicity depended on the dosage. These experiments demonstrate that the nanostructures are ideal candidates for applications in optics and biology as PL based devices with appropriate concentrations of RE ions, optical switches, SERS substrates, and therapeutic agents towards cancer cell lines.
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Acknowledgements
E. Ramya earnestly acknowledges University Grants Commission (UGC)-Basic Scientific Research (BSR), No. F.5-123/2007(BSR) India. L. Jyothi acknowledges DST for the award of Fast Track Scheme for young scientists (DST No: SB/FTP/PS-043/2013 Dated: 27/03/2015) and UGC for women postdoctoral fellowship (F. 15-1/2011-12/PDFWM-2011-12-GE-AND-3150(SA-II) dated: 01-11-2013). D. Narayana Rao acknowledges the UGC-BSR fellowship.
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Ramya, E., Jyothi, L., Gopal, N.S. et al. Optical and biomedical properties of eco-friendly metal nanostructures synthesized using Trigonella foenum-graecum leaf extract. Appl Nanosci 8, 771–783 (2018). https://doi.org/10.1007/s13204-018-0821-x
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DOI: https://doi.org/10.1007/s13204-018-0821-x