Aufsatz in einer Fachzeitschrift
Non-resonant light scattering in dispersions of 2D nanosheets
Details zur Publikation
Autor(inn)en: | Harvey, A.; Backes, C.; Boland, J.; He, X.; Griffin, A.; Szydlowska, B.; Gabbett, C.; Donegan, J.; Coleman, J. |
Verlag: | NATURE PUBLISHING GROUP |
Publikationsjahr: | 2018 |
Zeitschrift: | Nature Communications |
Seitenbereich: | 4553 |
Jahrgang/Band : | 9 |
Seitenumfang: | 11 |
ISSN: | 2041-1723 |
DOI-Link der Erstveröffentlichung: |
Zusammenfassung, Abstract
Extinction spectra of nanomaterial suspensions can be dominated by light scattering, hampering quantitative spectral analysis. No simple models exist for the wavelength-dependence of the scattering coefficients in suspensions of arbitrary-sized, high-aspect-ratio nanoparticles. Here, suspensions of BN, talc, GaS, Ni(OH)(2), Mg(OH)(2) and Cu(OH)(2) nanosheets are used to explore non-resonant scattering in wide-bandgap 2D nanomaterials. Using an integrating sphere, scattering coefficient (sigma) spectra were measured for a number of size-selected fractions for each nanosheet type. Generally, s scales as a power-law with wavelength in the non-resonant regime: sigma(lambda)proportional to[lambda/< L >](-m), where < L > is the mean nanosheet length. For all materials, the scattering exponent, m, forms a master-curve, transitioning from m = 4 to m = 2, as the characteristic nanosheet area increases, indicating a transition from Rayleigh to van der Hulst scattering. In addition, once material density and refractive index are factored out, the proportionality constant relating s to [lambda/< L >](-m), also forms a master-curve when plotted versus < L >.
Extinction spectra of nanomaterial suspensions can be dominated by light scattering, hampering quantitative spectral analysis. No simple models exist for the wavelength-dependence of the scattering coefficients in suspensions of arbitrary-sized, high-aspect-ratio nanoparticles. Here, suspensions of BN, talc, GaS, Ni(OH)(2), Mg(OH)(2) and Cu(OH)(2) nanosheets are used to explore non-resonant scattering in wide-bandgap 2D nanomaterials. Using an integrating sphere, scattering coefficient (sigma) spectra were measured for a number of size-selected fractions for each nanosheet type. Generally, s scales as a power-law with wavelength in the non-resonant regime: sigma(lambda)proportional to[lambda/< L >](-m), where < L > is the mean nanosheet length. For all materials, the scattering exponent, m, forms a master-curve, transitioning from m = 4 to m = 2, as the characteristic nanosheet area increases, indicating a transition from Rayleigh to van der Hulst scattering. In addition, once material density and refractive index are factored out, the proportionality constant relating s to [lambda/< L >](-m), also forms a master-curve when plotted versus < L >.
