Citation: Qing-hai Yan, Yi-yu Feng, Wei Feng. Azo-based Photo-thermal Materials Based on Rapid Heat Release[J]. Acta Polymerica Sinica, ;2019, 50(9): 925-931. doi: 10.11777/j.issn1000-3304.2019.19052 shu

Azo-based Photo-thermal Materials Based on Rapid Heat Release

School of Materials Science and Engineering, Tianjin University, Tianjin 300072

Corresponding author: Wei Feng, weifeng@tju.edu.cn
Received Date: 18 March 2019
Revised Date: 30 March 2019
Available Online: 10 May 2019

Azobenzene (Azo) can absorb specific wavelength light that makes a change from trans-state to cis-state structure. Energy storage can be achieved by the difference in energy levels between the two isomers, so Azo is often used as energy storage materials. The conventional Azo photo-thermal storage materials have problems of relying on the utilization of ultraviolet light, requiring a high temperature stimulation, and a low-rate heat release. Herein, by utilizing diazonium salt method to introduce thiazole and methoxy groups into Azo to form a push-pull electronic structure, thiazole-heterocyclic Azo (t-Azo-h) achieves fast heat release. The photo-thermal storage composite (t-Azo-h/rGO) is obtained through grafting azo monomers onto the surface of reduced graphene oxide (rGO). Due to the close accumulation of Azo units on the surface of rGO, t-Azo-h/rGO of graphene-templated assembly increases the intermolecular interaction, resulting in an energy storage density of 89 Wh/kg, a half-life of 10 h, and a high power density of 890 W/kg at a heating rate of 5 °C/min. UV spectrum shows the maximum absorption intensity is at 435 nm, realizing absorption of the violet region because of molecular polarizability increased due to push-pull electronic properties. Red shift of spectral absorption broadens the use of sunlight. Owing to fast heat release, t-Azo-h/rGO reaches the temperature difference of 2.6 °C under 60 °C and 3.8 °C under 80 °C, respectively. By designing thermochromic pigment in combination with photo-thermal film, the decoloration occurs in two thermochromic pigments (red → colorless at 62 °C, blue → colorless at 82 °C) due to the heat release of photo-thermal material under heat stimulation. The t-Azo-h/rGO with fast heat release achieves the thermal visualization by optimizing stimulus. By designing push-pull electronic structure, a kind of photo-thermal material with fast thermal output is obtained and photo-thermal material with rapid heat release could finish a higher power density output at low temperature than that of slow heat release. At last, the thermal display with temperature response is realized by combining thermochromic pigments. Thermal display is expected to be applied in temperature supervisory and information encryption field.
- Heterocyclic,
- Heat storage density,
- Power density,
- Visualization,
- Push-pull electronic structure
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