title: Absorption spectroscopy of powdered materials using time-resolved diffuse optical methods.
abstract: In this paper a novel method, based on time-resolved diffuse optical spectroscopy, is proposed to measure the absorption of small amounts of nanostructured powder materials independent of scattering. Experimental validation, in the visible and near-infrared spectral range, has been carried out on India Ink<sup/>particles. The effectiveness of the technique to measure scattering-free absorption is demonstrated on carbon nanotubes. The comparison between the absorption spectra acquired by the proposed method and conventional measurements performed with a commercial spectrophotometer is discussed.
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano, Milan, Italy. cosimo.dandrea@polimi.it
authors.forename: Cosimo
authors.initials: C
authors.lastname: D'Andrea
authors.forename: Ekaterina A
authors.initials: EA
authors.lastname: Obraztsova
authors.forename: Andrea
authors.initials: A
authors.lastname: Farina
authors.forename: Paola
authors.initials: P
authors.lastname: Taroni
authors.forename: Guglielmo
authors.initials: G
authors.lastname: Lanzani
authors.forename: Antonio
authors.initials: A
authors.lastname: Pifferi
mesh_terms: D002244:Carbon / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry; D055620:Optical Phenomena; D011208:Powders / Q000737:chemistry*; D012542:Scattering, Radiation; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods*; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation / Q000379:methods
chemical_list: D037742:Nanotubes, Carbon; D011208:Powders; C028433:chinese ink; D002244:Carbon