Non-resonant light scattering in dispersions of 2D nanosheets

Andrew Harvey, Claudia Backes, John B. Boland, Xiaoyun He, Aideen Griffin, Beata Szydlowska, Cian Gabbett, John F. Donegan and Jonathan N. Coleman ()
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Andrew Harvey: CRANN & AMBER Research Centers, Trinity College Dublin
Claudia Backes: Chair of Applied Physical Chemistry, University of Heidelberg
John B. Boland: CRANN & AMBER Research Centers, Trinity College Dublin
Xiaoyun He: CRANN & AMBER Research Centers, Trinity College Dublin
Aideen Griffin: CRANN & AMBER Research Centers, Trinity College Dublin
Beata Szydlowska: CRANN & AMBER Research Centers, Trinity College Dublin
Cian Gabbett: CRANN & AMBER Research Centers, Trinity College Dublin
John F. Donegan: CRANN & AMBER Research Centers, Trinity College Dublin
Jonathan N. Coleman: CRANN & AMBER Research Centers, Trinity College Dublin

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: 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 (σ) spectra were measured for a number of size-selected fractions for each nanosheet type. Generally, σ scales as a power-law with wavelength in the non-resonant regime: σ(λ)∝[λ/〈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 σ to [λ/〈L〉]−m, also forms a master-curve when plotted versus 〈L〉.

Date: 2018
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DOI: 10.1038/s41467-018-07005-3

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