Al2O3-Cu光譜選擇性複合吸收膜之製作與研究

本研究以無電鍍複合鍍製程製備Al2O3- Cu複合鍍選擇性吸收膜，並藉由田口法歸納出高太陽光吸收性能之最佳化製程參數，配合黑化處理及Sol-gel法於吸收膜表面上備製AR層，製備高吸收性能之Al2O3- Cu複合鍍選擇性吸收膜。利用紫外可見近紅外光分光光譜儀(UV-Vis-NIR)量測吸收膜在300 nm ~ 2500 nm波長範圍之反射率，並計算其吸收率(α)、傅立葉轉紅外線光譜儀(FTIR)量測吸收膜在4000 cm-1 ~ 666 cm-1波數(2500 nm ~ 15000 nm波長)範圍之反射率，並計算其熱輻射率(ε)、掃描式電子顯微鏡(SEM)觀察吸收膜表面形貌及膜厚。得到吸收率做望大型分析之最佳化參數：Al2O3粒徑：15nm，粉末含量：12g/L，pH值：10，溫度：70℃，膜厚：2μm；吸收率(α)：0.81，熱輻射率(ε)：0.40，吸收比(α/ε)：2.025。吸收比做望大型分析之最佳化參數：Al2O3粒徑：300nm，粉末含量：8g/L，pH值：10，溫度：80℃，膜厚：0.5μm；吸收率(α)：0.63，熱輻射率(ε)：0.07，吸收比(α/ε)：9。觀察不同條件試片之SEM表面形貌圖後，發現隨著厚度提升或溫度降低，會有明顯的角錐狀表面形貌，可以提高其吸收率，但熱輻射同時提高。

關鍵字

複合吸收膜；無電鍍；抗反射層；吸收率(α) ；熱輻射率(ε)

並列摘要

In this study, the electroless composite coating technology has been utilized to deposit the Al2O3-Cu composite solar selective surface coatings on Al substrates. The electroless composite coating technology has used to replace the high expenses and complex fabrication methods, due to its lower cost, simple equipment and easy to operate. The α of Al2O3-Cu/Al absorber was measured in 300 ~2500 nm wavelength interval by using the UV/VIS/NIR spectrophotometer；while the FTIR spectrophotometer was utilized to measure the ε in 2500nm~25000nm. The surface morphology and thickness of absorber coatings were observed by SEM. Be expected to do large-scale analysis of absorption rate for parameter：Al2O3 particle size：15nm, powder content：12g / L, pH value：10, temperature：70 ℃, thickness: 2μm; absorption rate (α)： 0.81, heat emissivity (ε)：0.40, absorption ratio (α / ε)：2.025. Compared the hope of absorbing the best of large-scale parameters: Al2O3 particle size：300nm, powder content：8g/L, pH value：10, temperature：80 ℃, thickness：0.5μm; absorption rate (α)：0.63, heat emissivity (ε)：0.07, absorption ratio (α / ε)：9. Specimens in different conditions observed surface topography SEM was found to enhance or lower the temperature with the thickness, cone angle will be obvious surface morphology, can enhance the absorption rate, but at the same time improve the thermal radiation.