Single molecular detection of a perylene dye dispersed in a Langmuir-Blodgett fatty acid monolayer using surface-enhanced resonance Raman scattering

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Carlos J L ConstantinoR F Aroca

Abstract

The Langmuir-Blodgett (LB) monolayer technique was used to fabricate single molecule LB monolayer containing bis(phenethylimido)perylene (PhPTCD), a red dye dispersed in arachidic acid (AA) with an average doping of 1 molecule per microm2. The monolayer was transferred onto Ag island films to obtain spatially resolved surface-enhanced resonance Raman scattering (SERRS) spectra. The mixed LB monolayers were fabricated with a concentration, on average, of 1, 6, 19 and 118 PhPTCD molecules per microm2 in AA. The AA provides a two-dimensional host matrix whose background signal does not interfere with the detection of the probe molecule's SERRS signal. The properties of the single molecule detection were investigated using micro-Raman with a 514.5-nm laser line. The Ag island surfaces coated with the LB monolayer were mapped with spatial steps of 3 microm and global chemical imaging of the most intense SERRS band in the spectrum was also recorded. The SERRS and surface-enhanced fluorescence (SEF) of the neat and single molecule LB monolayer were recorded in a temperature range from liquid nitrogen to + 200 degrees C. Neat PhPTCD LB monolayer spectra served as reference for the identification of characteristic signatures of the sing...Continue Reading

Citations

Nov 19, 2005·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Nicholas P W Pieczonka, Ricardo F Aroca
Jul 29, 2005·Analytical and Bioanalytical Chemistry·Gary A Baker, David S Moore
Dec 9, 2003·Applied Spectroscopy·Carlos J L ConstantinoRicardo Aroca
Mar 27, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·José Diego FernandesCarlos José Leopoldo Constantino
Sep 1, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·N P W PieczonkaR F Aroca

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