Nanostructured Assemblies of Gold and Silver Nanoparticles for Plasmon Enhanced Spectroscopy Using Living Biotemplates
Abstract: The ability to control the assembly of nanoparticles on substrates used in plasmon-enhanced spectroscopy continues to drive research in the field of nanofabrication. Here we describe the use of fungi as soft biotemplates to fabricate nanostructured microtubules with gold and gold-silver nanoparticles with potential applications as sensors and biosensors. In the first step, spores of the filamentous fungus Cladosporium sphaerospermum were inoculated in a suspension of gold nanoparticles, forming stable microtubules of gold nanoparticles during fungus growth. These materials were exposed to a second suspension of silver nanoparticles, resulting in complexes multilayers structures of gold and silver nanoparticles, which were evaluated as substrates for surface-enhanced Raman scattering (SERS) using small amounts of thiophenol as probe molecules directly on the microtubules. Both gold and the gold-silver substrates provide the SERS effect.
Author(s): Kubo, AM (Kubo, Andressa M.); Gorup, LF (Gorup, Luiz F.); Toffano, L (Toffano, Leonardo); Amaral, LS (Amaral, Luciana S.); Rodrigues, E (Rodrigues-Filho, Edson); Mohan, H (Mohan, Haider); Aroca, R (Aroca, Ricardo); Camargo, ER (Camargo, Emerson R.).
COLLOIDS AND INTERFACES
Volume: 1 | Ed: 1 | Number of article: UNSP 4 | Published: DEC 2017
DOI: 10.3390/colloids1010004
