Greatly improved heat-shielding performance of KxWO3 by trace Pt doping for energy-saving window glass applications
Greatly improved heat-shielding performance of KxWO3 by trace Pt doping for energy-saving window glass applications
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DOI：
10.1016/j.solmat.2017.08.013
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发表时间：
2018-01-01
影响因子：
6.9
通讯作者：
Liu, Su-Hua
中科院分区：
文献类型：
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作者：
Ran, Shuai;Liu, Jingxiao;Liu, Su-Hua
以廉价的钨酸钠为原料，采用溶剂热还原法制备了具有优良近红外屏蔽和隔热性能的掺铂KxWO 3纳米棒。研究了K/W比和Pt掺杂对KxWO 3颗粒的微观结构、形貌和透明隔热性能的影响。结果表明，Pt的掺杂有助于提高还原态W（W5+和W 4+）的含量，促进六方KxWO 3纳米棒的均匀生长，减小颗粒尺寸。与未掺杂的KxWO 3颗粒相比，Pt掺杂的KxWO 3样品具有改善的近红外屏蔽和隔热性能。当K/W = 0.4时，微量Pt（0.1mol%）的加入，由于其较低的粉末电阻率和较高的还原态W（W5+和W 4+）含量，大大提高了KxWO 3的近红外屏蔽和透明绝缘性能。而Pt掺杂量过多则会降低KxWO 3的可见光透过率。讨论了Pt掺杂促进W5+/W 4+形成和提高KxWO 3绝热性能的机理。结果表明，微量Pt掺杂的KxWO 3粒子具有优异的透明性和隔热性能，更适合于制备透明隔热膜，在节能窗玻璃领域具有广阔的应用前景。
Pt-doped KxWO3 nanorods with excellent near-infrared shielding and heat insulation performance were prepared by solvothermal reduction method using cheap sodium tungstate as raw materials. The effects of K/W ratio and Pt doping on the microstructure, morphology and transparent heat insulation performance of KxWO3 particles were investigated. It was found that Pt doping contributed to increasing the content of W in reduced state (W5+ and W4+), promoting the uniform growth of hexagonal KxWO3 nanorods and decreasing the particle size. Compared with the undoped KxWO3 particles, Pt-doped KxWO3 samples exhibited improved near-infrared shielding and heat insulation properties. Particularly, when K/W was 0.4, the incorporation of trace Pt (0.1 mol %) greatly improved the near-infrared shielding and transparent insulation properties of KxWO3 particles, which is ascribed to its lower powder resistivity and more content of W in reduced state (W5+ and W4+). Whereas too much Pt-doping amount tended to decrease the visible light transmittance of KxWO3. The mechanism of Pt doping promoting the W5+/W4+ formation and improving the heat insulation of KxWO3 were discussed. It is suggested that the trace Pt-doped KxWO3 particles with excellent transparency and heat insulation properties are more suitable for the preparation of transparent insulation films and have broad applications in the field of energy-saving window glasses.