Non-resonant light scattering in dispersions of 2D nanosheets.
Non-resonant light scattering in dispersions of 2D nanosheets.
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DOI：
10.1038/s41467-018-07005-3
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发表时间：
2018-11-01
影响因子：
16.6
通讯作者：
Coleman JN
中科院分区：
文献类型：
--
作者：
Harvey A;Backes C;Boland JB;He X;Griffin A;Szydlowska B;Gabbett C;Donegan JF;Coleman JN
纳米材料悬浮液的消光光谱受光散射的影响较大，阻碍了定量光谱分析。对于任意尺寸的高深宽比纳米颗粒悬浮液中的散射系数与波长的关系，目前还没有简单的模型。本文使用BN、滑石粉、GAS、Ni(OH)2、Mg(OH)2和Cu(OH)2纳米片的悬浮液来研究宽禁带2D纳米材料中的非共振散射。使用积分球，测量了每种纳米片类型的一些尺寸选择的分数的散射系数(σ)光谱。一般情况下，σ在非共振区与波长成幂函数关系：σ(λ)∝[λ/〈L〉]−m，其中〈L〉是平均纳米片长度。对于所有材料，随着特征纳米片面积的增加，散射指数m形成主曲线，从m = 4过渡到m = 2，表明从瑞利散射到范德胡斯特散射的过渡。此外，一旦扣除材料密度和折射率，σ与[λ/〈L〉]−m]的比例常数在绘制时也形成了与〈L〉的主曲线。由于光散射的存在，二维材料的消光光谱的定量分析变得非常复杂。在这里，作者研究了宽带隙纳米片悬浮液中的非共振散射，并发展了一个通用的模型，该模型允许将散射光谱用作纳米片分散体中颗粒尺寸的度量。
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〉. Quantitative analysis of the extinction spectra of dispersions of 2D materials is complicated by light scattering. Here, the authors investigate non-resonant scattering in suspensions of wide-bandgap nanosheets, and develop a general model which allows the scattering spectra to be used as metrics for particle size in nanosheet dispersions.
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影响因子：
1.9
作者：
Nilsson, AMK;Sturesson, C;Andersson-Engels, S
通讯作者：
Andersson-Engels, S
影响因子：
3
作者：
LIGHT, LB;HUEBNER, JS;VERGENZ, RA
通讯作者：
VERGENZ, RA
影响因子：
6.7
作者：
Backes, Claudia;Paton, Keith R.;Coleman, Jonathan N.
通讯作者：
Coleman, Jonathan N.
影响因子：
8.6
作者：
Harvey, Andrew;Backes, Claudia;Coleman, Jonathan N.
通讯作者：
Coleman, Jonathan N.
影响因子：
56.9
作者：
Bachilo, SM;Strano, MS;Weisman, RB
通讯作者：
Weisman, RB