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A series of Cr3+ doped BiVO4 (Cr-BiVO4) and palygorskite (PGS)/Cr-BiVO4 composite materials were prepared by hydrothermal method using Bi(NO3)3•5H2O, NH4VO3, Cr2O3 and PGS as raw materials, and characterized by XRD, SEM, TEM and UV-Vis for analyses on structure, composition, morphology and optical performance. The thermochromic behavior of the composite materials was evaluated, with the color change mechanism speculated. The results indicated that the doping of Cr3+and PGS showed no effect on the monoclinic phase of BiVO4 but widened the absorption range of the material in the visible light region. The maximum absorption edge of 30% Cr-BiVO4 with a Cr3+ doping content (based on the mass of BiVO4, the same below) redshifted from 536 nm to 634 nm and the absorbance was enhanced. Both Cr-BiVO4 and PGS/Cr-BiVO4 displayed reversible thermochromic properties at 20~500 ℃. Compared with that of BiVO4 (from bright yellow to red, r.t.~300 ℃), the color changing temperature of 30% Cr-BiVO4 decreased 100 ℃ and achieved reversible change between dark orange and red at r.t.~200 ℃. 30% Cr-BiVO4 could repeat reversible thermochromic behavior more than 12 times at 20~500 ℃. Meanwhile, the water-based coating from 20% PGS/30% Cr-BiVO4 composite materials prepared with 20% mass fraction of PGS exhibited reversible thermochromic between orange yellow to red. The phase transition between the monoclinic and tetragonal phases of BiVO4 in the composite material was the fundamental cause for its reversible thermochromic property.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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