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Abstract
Transparent heat mirrors have been attracting a great deal of interest in the last few decades due to their broad applications, which range from solar thermal convection to energy-saving. Here, we present a flexible Polyethylene terephthalate/Ag-doped Indium tin oxide/Polydimethylsiloxane (PAIP) thin film that exhibits high transmittance in visible range and low emissivity in the thermal infrared region. Experimental results show that the temperature of the sample can be as high as 108 °C, which is ~23 °C higher than that of a blackbody control sample under the same solar radiation. Without solar radiation, the temperature of the PAIP thin film is ~6 °C higher than that of ordinary fabric. The versatility of the large-area, low-radiation-loss, highly-transparent and flexible hydrophobic PAIP thin film suggest great potential for practical applications in thermal energy harvesting and manipulation.
Highlights
High efficiency and energy-saving technologies are highly desirable due to increasing global energy consumption [1,2]
The low-emissivity and hydrophobic coating consists of a thin layer of Ag-doped ITO (65 nm in thickness) and an optically thick PDMS layer (~490 nm in thickness)
The hydrophobic thin PDMS layer can play an important role in improving the corrosion resistance of thin film, and provide a self-cleaning function (the contact angle was shown in Figure A3 (Appendix A))
Summary
High efficiency and energy-saving technologies are highly desirable due to increasing global energy consumption [1,2]. For the application scenarios which require transparency (such as greenhouse coverings and windows plates), thermal management becomes more difficult, because reducing the energy consumption of these cases put higher requirements on the optical properties of materials, namely, (a) low emissivity in the infrared range to reduce heat radiation dissipation and (b) high light transmittance in the visible range to ensure transparency. High transmittance (~80%) in visible range (400–800 nm) and extremely low emissivity (~10%) in IR range (3–20 um) were found This unique optical property of THM shows great potential in thermal management of places that require light transmission [27,28]. By simultaneously engineering the optical property in solar as well as in long wavelength IR spectral regions, PET/Ag-doped ITO/PDMS (PAIP) thin films were designed This structure can well meet the requirements on the optical properties of materials in thermal management applications for some specific environments mentioned above. Experimental results show that our thin film can achieve appreciable heating effect of both indoor and outdoor environments
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