Transparent (NH4)xWO3 colloidal dispersion and solar control foils: Low temperature synthesis, oxygen deficiency regulation and NIR shielding ability

摘要: Abstract Highly-stable aqueous dispersion of (NH 4 ) x WO 3 crystallites (ac. 6–12 nm in diameter and 20–100 nm length) with decent infrared shielding ability was synthesized at only 100 °C. The effects reducing agent (N 2 H ∙2HCl) dosage on the phase, morphology, zeta potential composite products have been systematically addressed. It shown that addition N ∙2HCl precursor solution introduced obvious oxygen deficiency into crystallites, resulting a further improved NIR ability. However, high dosages were found to depress potentials accelerate growth crystallites. A mechanism, which reasonably supported by confirmatory experiments, extracted explain result. To show application our product, -based flexible solar control foils prepared directly casting onto polyethylene terephthalate (PET) substrates. can selectively cut-off near light (NIR) 65.8% (transmittance depressed from 91.3% bare PET 25.5% foils), while maintaining visible transmittance 67.6%, showing promise as energy-efficient filter.