NIR shielding performance and spectral selectivity of PVB interlayer films loaded with composite fillers derived from CsWO3 coupled with Au nanorods

A novel type of near infrared (NIR) shielding filler was prepared by mixing gold nanorods (AuNR) with the precursors used for the solvothermal synthesis of cesium tungstate (CsWO3). The synthesized product (CsWO3@AuNR) had a lower NIR transmittance (TNIR) value than neat CsWO3. The spectral selectivity (TVis/TNIR) of the extruded PVB film compounded with CsWO3@AuNR was also greater than that loaded with neat CsWO3 particles. The glass/PVB/glass laminate, containing PVB loaded with 0.1 wt% CsWO3@AuNR, provided impressive heat shielding performance. Specifically, the temperature inside the model house installed with the above laminate dropped by 9 1C while a visible light transmittance (TVis) value of approximately 70% could be maintained. The above results outperformed those of glass laminated with PVB/ATO interlayer films. The results from thermal gravimetric analysis also show that the thermal stability of PVB/(CsWO3@AuNR) was better than that of the PVB/ATO film. Overall, this work demonstrated that by properly balancing the concentration of (CsWO3@AuNR) particles, the NIR shielding ability of PVB composite films could be controlled without sacrificing optical transparency and thermal stability.