摘要
面对全球气候变化与城市热岛效应日益加剧的挑战,开发兼具高近红外反射性能与热调控能力的节能功能材料已成为研究热点.传统氧化物材料如Bi_(2)MoO_(6)在近红外波段的反射性能仍存在一定局限.近年来,稀土改性钼酸盐材料因其优异的光学响应特性及结构稳定性,在近红外反射材料领域得以广泛关注.本文采用固相合成法制备了Gd^(3+)掺杂的近红外反射材料Bi_(2-x)Gd_(x)MoO_(6)(x=0,0.2,0.4,0.6,0.8,1.0);利用X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱分析(EDS)、傅里叶变换红外光谱(FTIR)、拉曼光谱(Raman)、近红外(NIR)反射测试、热重-差热分析(TG-DSC)及隔热性能实验对样品进行了表征.结果表明,合成的样品具有良好的结晶度.Gd^(3+)掺杂引起带隙收缩(2.87 eV至2.80 eV),导致吸收边红移,增强了样品对450~600 nm蓝绿光的吸收,使其呈现更明显的黄色调,从而实现了色彩调控.Bi_(2-x)Gd_(x)MoO_(6)系列样品皆表现出较高的近红外反射率,均高于87.68%,显著高于TiO_(2)(75.66%).尤其是x=0.4时,样品的近红外反射率达到90.11%,近红外太阳反射率为89.53%,分别比TiO_(2)高出14.45%和9.24%.红外线灯照射实验进一步验证了其优异的节能隔热性能.TG-DSC分析表明,Bi_(2-x)Gd_(x)MoO_(6)材料具有优异的热稳定性,可在高温环境下长期使用,为高效隔热材料提供了新的选择.
In response to the escalating challenges of global climate change and urban heat island effects,the development of energy-efficient functional materials with high near-infrared(NIR)reflectance and effective thermal regulation capabilities has become a research focus.Traditional oxide materials,such as Bi_(2)MoO_(6),still exhibit certain limitations in NIR reflectance.In recent years,rare-earth-modified molybdate materials have attracted significant attention in the field of NIR-reflective coatings due to their excellent optical response characteristics and structural stability.In this study,Gd^(3+)-doped Bi_(2-x)Gd_(x)MoO_(6)(x=0,0.2,0.4,0.6,0.8,1.0)NIR reflective materials were synthesized via a solid-state reaction method.The obtained samples were systematically characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),Raman spectroscopy,near-infrared(NIR)reflectance spectroscopy,thermogravimetric-differential scanning calorimetry(TG-DSC)and thermal insulation performance tests.The results indicated that the synthesized samples exhibited good crystallinity.Gd^(3+)doping induced a bandgap narrowing(from 2.87 eV to 2.80 eV),leading to a redshift of the absorption edge and enhanced absorption in the 450-600 nm blue-green region,resulting in a more pronounced yellow hue and enabling effective color modulation.All Bi_(2-x)Gd_(x)MoO_(6)samples exhibited high NIR reflectance,with values exceeding 87.68%,significantly higher than that of TiO_(2)(75.66%).In particular,the sample with x=0.4 demonstrated the highest NIR reflectance of 90.11%and a NIR solar reflectance of 89.53%,which are 14.45%and 9.24%higher than those of TiO_(2),respectively.Infrared lamp irradiation experiments further confirmed the superior energy-saving and thermal insulation performance of the materials.TG-DSC analysis revealed that Bi_(2-x)Gd_(x)MoO_(6)pigments possess excellent thermal stability,allowing for long-term application in high-temperature environments.These findings offer a new and promising alternative for high-performance thermal insulation materials.
作者
闫峻琳
李晓东
刘东洋
李明哲
张粟
YAN Junlin;LI Xiaodong;LIU Dongyang;LI Mingzhe;ZHANG Su(School of Materials Science and Engineering,Jilin Jianzhu University,Changchun 130118,China;Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo 315336,China;Geely Automobile(Ningbo Hangzhou Bay Branch)of Zhejiang Jirun Automobile Co.,Ltd.,Ningbo 315480,China;State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)
出处
《高等学校化学学报》
北大核心
2025年第9期38-49,共12页
Chemical Journal of Chinese Universities
基金
吉林省科技发展计划项目(批准号:20230101051JC)资助.
