Huang Lei, Tang Hua, Bai Youjun, Pu Yong, Li Lu, Cheng Jiang
Co-Innovation Center for Micro/Nano Optoelectronic Materials and Devices, Chongqing University of Arts and Sciences, Chongqing 402160, China.
Chongqing Changan Automobile Co., Ltd., Chongqing 400023, China.
Nanomaterials (Basel). 2020 Nov 20;10(11):2295. doi: 10.3390/nano10112295.
In this study, single-phase CsWO nanocrystals were synthesized by a novel mist chemical vapor deposition method. As prepared, CsWO nanocrystals exhibited a microsphere-like appearance constructed with angular crystal grains with an average size of about 30-40 nm. Characterization by X-ray photoelectron spectroscopy indicated that CsWO nanocrystals consisted of mixed chemical valence states of tungsten ions W and W, inducing many free electrons, which could scatter and absorb near-infrared (NIR) photons by plasmon resonance. These CsWO microspheres consisted of a loose structure that could be crushed to nanoscale particles and was easily applied for producing long-term stable ink after milling. Herein, a CsWO/polymer composite was successfully fabricated via the ultrasonic spray coating method using mixed CsWO ink and polyurethane acrylate solution. The composite coatings exhibited excellent IR shielding properties. Remarkably, only 0.9 mg cm CsWO could shield more than 70% of NIR, while still maintaining the visible light transmittance higher than 75%. Actual measurement results indicate that it has really good heat insulation properties and shows good prospect in heat insulation window applications.
在本研究中，通过一种新型的雾状化学气相沉积法合成了单相CsWO纳米晶体。制备的CsWO纳米晶体呈现出微球状外观，由平均尺寸约为30 - 40 nm的角状晶粒构成。X射线光电子能谱表征表明，CsWO纳米晶体由钨离子W和W的混合化学价态组成，产生了许多自由电子，这些自由电子可通过等离子体共振散射和吸收近红外（NIR）光子。这些CsWO微球具有松散的结构，可被粉碎成纳米级颗粒，并且在研磨后易于用于制备长期稳定的墨水。在此，通过使用混合的CsWO墨水和聚氨酯丙烯酸酯溶液的超声喷涂法成功制备了CsWO/聚合物复合材料。复合涂层表现出优异的红外屏蔽性能。值得注意的是，仅0.9 mg/cm²的CsWO就能屏蔽超过70%的近红外光，同时仍保持高于75%的可见光透过率。实际测量结果表明它具有非常好的隔热性能，在隔热窗应用中显示出良好的前景。
