资源环境科技发展态势分析平台

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 >.