Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.
Nanoscale. 2013 May 7;5(9):3787-92. doi: 10.1039/c3nr00520h. Epub 2013 Mar 19.
Nanopaper is a flexible, transparent, and renewable substrate that is emerging as a replacement for plastic in printed "green" electronics. The underlying science of transparency of nanopaper is that the diameter of these fibers is much smaller than the light wavelength, which significantly decreases the light scattering as compared to regular fibers. Cellulose fibers have a hierarchical structure, which consists of numerous smaller fibers. In this manuscript, we demonstrate a nanopaper design with different fiber diameters, and conclude that the light transmittance and scattering depend on the fiber diameter and packing density. The optical properties of the nanopaper and their dependence on the cellulose fiber diameter are thoroughly explained through Chandrasekhar's radiative-transfer theory and multiple scattering method simulations. The controllable optical properties of highly transparent nanopaper present an unprecedented opportunity for growth of next-generation optoelectronics.
纳米纸是一种灵活、透明且可再生的基底，正逐渐取代塑料成为印刷“绿色”电子产品的材料。纳米纸透光的基本原理是，这些纤维的直径远小于光的波长，这显著降低了与常规纤维相比的光散射。纤维素纤维具有分层结构，由许多较小的纤维组成。在本手稿中，我们展示了一种具有不同纤维直径的纳米纸设计，并得出结论，光透过率和散射取决于纤维直径和堆积密度。通过 Chandrasekhar 的辐射传输理论和多次散射方法模拟，彻底解释了纳米纸的光学性质及其对纤维素纤维直径的依赖性。高度透明的纳米纸的可控光学性质为下一代光电的发展带来了前所未有的机遇。
