Open AccessOptical response and SERS properties of individual large scale supracrystals made of small silver nanocrystals
Author(s) -
Pierre Aubertin,
Mohamed Ali Ben Aissa,
Noureddine Raouafi,
Suzanne Joiret,
Alexa Courty,
Emmanuel Maisonhaute
Publication year - 2015
Publication title -
nano research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.536
H-Index - 125
eISSN - 1998-0124
pISSN - 1998-0000
DOI - 10.1007/s12274-014-0650-5
Subject(s) - absorbance , thiophenol , raman spectroscopy , superlattice , nanocrystal , materials science , silver nanoparticle , wavelength , nanoparticle , surface enhanced raman spectroscopy , nanoscopic scale , nanotechnology , spectroscopy , optics , optoelectronics , chemistry , raman scattering , physics , medicinal chemistry , quantum mechanics
International audienceThere is a considerable interest in producing and understanding the optical andspectroscopic properties of ordered nanoparticle assemblies. Herein, we describeand interpret the optical absorbance and Raman properties of 5.9 nm ± 0.3 nmdiameter silver nanocrystals coated with dodecanethiol and organized in highlyordered 3D superlattices of different heights. Each superlattice was studiedindividually, which allowed to elaborate a model based on Maxwell-Garnetttheory to reproduce qualitatively the height and wavelength dependence ofthe absorbance. Importantly, because of their small size compared to that oftraditional nanoparticles used in Surface Enhanced Raman Spectroscopy (SERS),the large 3D distribution of hot spots generated by the silver superlatticesallowed to easily obtain SERS spectra of the surrounding ligands despite theirintrinsic low Raman cross section. Accordingly, traces of thiophenol could bedetected very easily
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