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Ag/lamellar hosts composites: a route to morphology-controllable synthesis of Ag nanoparticles

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Abstract

An easy and novel routine are reported for the preparation of metallic silver nanoparticles (AgNPs) with controlled morphology, using Na+–magadiite swelled with hexadecyltrimethylammonium bromide (CTA+–magadiite) and a layered aluminophosphate with kanemite-type structure modified with n-dodecylammonium and n-butylammonium (but,dod-AlPO-kan) as hosts. For the preparation of the metallic AgNPs (Ag0) in the interlamellar space, the CTA+–magadiite and but,dod-AlPO-kan hosts were dispersed in N,N-dimethylformamide (DMF) solution with different AgNO3 concentrations. DMF acts as reducing agent of Ag+ ions leading to nanoparticles with disk-like morphology of magadiite silicate; these were characterized by TEM and UV–Vis spectroscopy. On the other hand, the AgNPs are intercalated in but,dod-AlPO-kan showing spherical-like morphology. The UV–Vis spectra of the nanocomposites based on Ag0 and magadiite silicate show bands at 565 nm that can be attributed to Ag0 nanodisks. The Ag-but,dod-AlPO-kan-based nanocomposites present a band at 422 nm attributed to the surface plasmon resonance of Ag0 nanospheres. The results of transmission electron microscopy agree very well with XRD and UV–Vis analysis, indicating the formation of AgNPs with different morphologies using the two kinds of lamellar materials. The magadiite host has an important role in the synthesis of Ag nanodisks, because it controls the growth of nanoparticles inside the interlayer region with disk-like morphology due the high interlayer interactions of the silicate, leading to the growth of nanoparticles in only two directions (xy plane). On the other hand, when but,dod-AlPO-kan is used a sphere-like morphology is preferred due the best accommodation of AgNPs between the layers of aluminophosphate host.

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Acknowledgements

Financial supports from FAPESP, CNPq, and European Community are gratefully acknowledged. The authors would like to thank Prof. C.H. Collins (IQ-UNICAMP, Campinas, Brazil) for English revision, the LME/LNNano/CNPEM for technical support during electron microscopy work and the Multiuser Laboratory of Advanced Optical Spectroscopy (LMEOA/IQ-UNICAMP) for use of its equipment. This work was also a contribution of the National Institute of Science and Technology in Complex Functional Materials (CNPq-MCT/FAPESP). Dr. Kai Dalmann is gratefully acknowledged for the donation of pseudobohemite.

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Correspondence to Italo O. Mazali or Heloise O. Pastore.

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Luiz P. da Costa and Fernando J. Quites contributed equally to this study.

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da Costa, L.P., Quites, F.J., Sigoli, F.A. et al. Ag/lamellar hosts composites: a route to morphology-controllable synthesis of Ag nanoparticles. J Nanopart Res 15, 1810 (2013). https://doi.org/10.1007/s11051-013-1810-3

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  • DOI: https://doi.org/10.1007/s11051-013-1810-3

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