Plasmonic structural colour paint gets commercial attention
Plasmonic structural colour paint gets commercial attention
复制标题
等离激元结构色涂料获得商业关注
DOI：
10.1038/s41565-023-01469-1
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发表时间：
2023
影响因子：
38.3
通讯作者：
Moscatelli, Alberto
中科院分区：
文献类型：
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作者：
Moscatelli, Alberto
目前的彩色涂料基于由有机染料制成的颜料。它们具有生产经济且为客户提供多种色调选择的巨大优势。然而，随着时间的推移，它们在光照下往往会褪色，而且在许多情况下制造起来并不环保。此外，它们通常需要多次涂抹才能达到所需的亮度。这增加了结构的重量，这在某些应用中可能成为问题。相反，许多花、鸟、蝴蝶和水下生物的主要颜色生成机制是由于通常两种无色纳米材料的结构排列所致。在这里，美国中佛罗里达大学教授 Debashis Chanda 看到了他的受生物启发的等离子体结构色彩材料有机会在现实世界中发挥作用。与染料不同，染料根据材料固有的电子特性来吸收和重新发射或反射光，结构有色材料纯粹根据纳米级特征的尺寸来利用光的吸收和散射。因此，结构尺寸或形状的简单改变就会产生新的颜色。“对我们来说，真正的突破是当我们弄清楚如何制造纳米级结构时，纳米级结构的颜色在任何角度都可以看到，而不仅仅是从垂直方向观察”，Chanda 回忆道。颜色角度依赖性问题一直是寻求结构颜色的一个问题，但 Chanda 的团队通过排列具有完全非周期性图案的纳米级材料克服了这一挑战。它们的结构由薄薄的氧化铝薄膜上高度堆积的自组装铝纳米颗粒单层组成，该薄膜充当铝后镜的间隔物。剥离多层结构会产生独立的“等离子体涂料”。此外，该结构是直接在电子束蒸发器中发生的自然成核过程的结果，这使得它对于高通量制造方法特别有吸引力。自组装纳米颗粒的尺寸和密度控制等离子体共振，进而控制最终的颜色。在他们的出版物中，该小组展示了相当宽的 CMY 色域。着眼于实际应用，他们还制造了一种可喷涂涂料（P. Cencillo-Abad 等人，Sci.
Present colour paints are based on pigments made with organic dyes. These have the great advantage of being economical to produce and give customers a large choice of hues. However, they tend to fade over time under light exposure and in many cases are not environmentally friendly to make. Moreover, they usually need to be applied multiple times to achieve the required brightness. This adds weight to the structure, which can become a problem in certain applications. On the contrary, the primary colour-generating mechanism of many flowers, birds, butterflies and underwater creatures is due to the structural arrangement of typically two colourless nanomaterials. Here is where Debashis Chanda, a professor at the University of Central Florida (USA), saw an opportunity for his bio-inspired plasmonic structural colour materials to make a difference in the real-world. Unlike dyes, where light is absorbed and re-emitted or reflected based on the material’s inherent electronic properties, structural coloured material exploits the absorption and scattering of light purely based on the size of nanoscale features. Hence, a simple change in structural size or shape produces a new colour.“For us, the real breakthrough came when we figured out how to make nanoscale structures, whose colour can also be seen when looking at any angle, and not just when viewed from the perpendicular direction” recounts Chanda. The problem of colour angular dependence has always been an issue in the quest for structural colours, but Chanda’s group overcame this challenge by arranging nanoscale materials with completely aperiodic patterns. Their architecture consists of a highly packed monolayer of self-assembled aluminium nanoparticles on a thin aluminium oxide film, which serves as a spacer from an aluminium back-mirror. Lifting-off the multi-layer structure results in a self-standing ‘plasmonic paint’. Further, the architecture is the result of a natural nucleation process occurring directly in an electron beam evaporator, making it particularly attractive for high-throughput fabrication methodologies.The size and density of the self-assembled nanoparticles control the plasmonic resonance and, in turn, the resultant colour. In their publication, the group demonstrated a fairly wide CMY colour gamut. With an eye on practical applications, they also made a sprayable paint (P. Cencillo-Abad et al. Sci.