TY - JOUR
T1 - Hf doping effect of tungsten bronze Cs0.32WO3 on tuning transparent thermal insulation performance for energy saving
AU - Li, Qianyi
AU - Zhang, Jingyao
AU - Xiong, Zhiyong
AU - Jin, Haibo
AU - Su, Yuefeng
AU - Feng, Caihong
AU - Li, Ning
AU - Wang, Chengzhi
AU - Li, Jingbo
N1 - Publisher Copyright:
© 2025 Elsevier Ltd and Techna Group S.r.l.
PY - 2025
Y1 - 2025
N2 - Cesium tungsten bronze (Cs0.32WO3) is a unique energy-saving material known for its exceptional visible transmittance and near-infrared (NIR) absorption. It has been demonstrated that ion-doping modification is a successful strategy for enhancing performance. However, the modification mechanism of the ion substitution at the W site remains unclear. In this study, we conducted Hf doping modification to investigate its effect and understand the modification mechanism. A series of Hf-doped Cs0.32WO3 (Hf-Cs0.32WO3) nanopowders were synthesized using the solid-state method. The doping of 1 % Hf elements improves both integral visible transmittance (Tlum, 380–780 nm) and near-infrared shielding efficiency (ΨNIR, 780–2500 nm) of Cs0.32WO3, achieving 47.9 % of Tlum and 72.0 % of ΨNIR. The improved Tlum can be attributed to the broadened bandgap (Eg) induced by Hf doping, and the higher oxygen vacancy content is responsible for the enhanced ΨNIR. The additional oxygen vacancies contribute free electrons and introduce defect energy levels, enhancing NIR absorption and compensating for the negative effect of the reduced concentrations of W5+ ions and free electrons caused by Hf doping. This study shows that the transparent thermal insulation performance of Cs0.32WO3 can be improved by suitable low-valence ion doping, thereby widening the research perspective for designing new cesium tungsten bronze NIR shielding materials.
AB - Cesium tungsten bronze (Cs0.32WO3) is a unique energy-saving material known for its exceptional visible transmittance and near-infrared (NIR) absorption. It has been demonstrated that ion-doping modification is a successful strategy for enhancing performance. However, the modification mechanism of the ion substitution at the W site remains unclear. In this study, we conducted Hf doping modification to investigate its effect and understand the modification mechanism. A series of Hf-doped Cs0.32WO3 (Hf-Cs0.32WO3) nanopowders were synthesized using the solid-state method. The doping of 1 % Hf elements improves both integral visible transmittance (Tlum, 380–780 nm) and near-infrared shielding efficiency (ΨNIR, 780–2500 nm) of Cs0.32WO3, achieving 47.9 % of Tlum and 72.0 % of ΨNIR. The improved Tlum can be attributed to the broadened bandgap (Eg) induced by Hf doping, and the higher oxygen vacancy content is responsible for the enhanced ΨNIR. The additional oxygen vacancies contribute free electrons and introduce defect energy levels, enhancing NIR absorption and compensating for the negative effect of the reduced concentrations of W5+ ions and free electrons caused by Hf doping. This study shows that the transparent thermal insulation performance of Cs0.32WO3 can be improved by suitable low-valence ion doping, thereby widening the research perspective for designing new cesium tungsten bronze NIR shielding materials.
KW - CsWO nanoparticles
KW - Doping modification
KW - Energy saving coating
KW - Near-infrared shielding
UR - http://www.scopus.com/inward/record.url?scp=85215383059&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2025.01.298
DO - 10.1016/j.ceramint.2025.01.298
M3 - Article
AN - SCOPUS:85215383059
SN - 0272-8842
JO - Ceramics International
JF - Ceramics International
ER -