文档名：Ag柔性薄膜的辐射致冷性能
摘要：辐射致冷柔性薄膜作为冷却电子器件的候选材料受到广泛关注.然而材料和制备工艺的限制,很难同时具备优异的辐射致冷性能和热稳定性.通过溶胶凝胶法制备了Al2O3掺杂无色聚酰亚胺(CPI)薄膜,不仅利用Al2O3声子-增强共振增强了红外辐射,而且超细Al2O3纳米粒子与分子链的相互作用提高了热稳定性.结果表明:Al2O3掺杂CPI/Ag复合膜随着Al2O3含量增加,中红外发射率逐渐增加而太阳光谱反射率逐渐减小,其中5%(质量分数)Al2O3掺杂CPI/Ag复合膜具有高的太阳光谱(0.4～2.5μm)反射率(91.12%)和中红外(5～20μm)发射率(92.15%).在阳光直射下,其最大冷却温度比环境温度低7.7℃,可降低铝制器件表面温度最大11.1℃.此外,该复合膜表现出优异的热稳定性(玻璃化转化温度约为328℃和热分解温度约为554℃).该研究结果为电子器件和航天器附件的高效辐射致冷提供了有效的策略.
Abstract：IntroductionThefamous"10℃law"indicatesthatthereliabilityofelectronicdevicesiscloselyrelatedtothetemperature,i.e.,thereliabilitycanbereducedby50%forevery10℃increaseintemperaturewhenthetemperatureofelectronicdevicesexceeds80℃.Itisthusextremelyimportanttodischargethewasteheatofelectronicdevicesintimetoachieveanefficientdevicecooling.Heattransfermethodsincludeheatconduction,heatconvectionandheatradiation.Conventionalair-cooledandliquid-cooledachievecoolingviaheatconvectionandheatconduction.Inaddition,thecoolingtechnologiesalsoincludemagneticcooling(i.e.,magneto-thermaleffect),phasechangecooling(i.e.,phasechangeheatstorage)andthermoelectriccooling(i.e.,thePeltiereffect).Withthehighintegrationandminiaturizationofelectronicdevices,especiallyflexibleelectronicdeviceslimitedbysizeanddeformation,conventionalcoolingtechnologiesarenolongerapplicable.Thenewlyflexibleradiativecoolingfilmswithzeropowerconsumptionbecomepotentialcandidatesforcoolingelectronicdevicesandareexpectedtopromotethedevelopmentofthenationaldual-carboncause,whichcanemitheattoouterspacethroughthermalradiationandrejectsolarirradiance.However,itisextremelydifficulttocombineoutstandingradiativecoolingperformancewithexcellentthermostabilitylimitedbymaterialsandpreparationprocess.Inthispaper,Al2O3-dopedcolorlesspolyimidehybridfilmswerepreparedbyasol-gelmethod.TheinfraredradiationenhancedbyAl2O3phonon-enhancedresonanceandthehigherthermostabilitybecauseoftheinteractionofAl2O3nanoparticleswiththemolecularchainswereanalyzed.MethodsTFMB(0.3657g)wasmixedwithDMAc(6mL)underelectromagneticstirringat0℃.Al(OH)3solatdifferentcontents(i.e.,0%,5%,10%,15%,and20%,inmassfraction)wasaddedtothesolutionabove.Anaccuratelyweighed6FDA(0.5036g)wassequentiallyaddedtoatridentflaskinbatchesfor1h,andthenstirredcontinuouslyfor30min.Subsequently,themixturewasstirredatroomtemperaturefor4h.Theobtainedprecursorpoly(amidoacid)(PAA)solutionwasrestedfor12h.ThePAAsolutionwascoatedontoadrycleanglasssubstratebyaspin-coatingmethodanddriedinavacuumtubefurnaceat80℃for1handthenat50℃for12htoensurethatthesolventwasremovedcompletely.Thesamplewasheatedinavacuumtubefurnaceinrespectiveheatingsteps(i.e.,at110℃for30min;at140℃for30min;at170℃for30min;at200℃for30min;at220℃for30min;andat280℃for60min).TheobtainedAl2O3-dopedcolorlesspolyimide(CPI)filmswereultrasonicallycleanedwithabsolutealcoholanddeionizedwaterfor30min.Thefilmswereblowndryandputintoavacuumchamber.A300nmthicksilver(Ag)filmwasdepositedonthebacksideoftheAl2O3-dopedCPIfilmviadirectcurrentsputteringat6×10-4Pa.Theargonflowrate,sputteringpressureandAgtargetpowerwere50cm3/min,0.5Paand100W,respectively.ResultsanddiscussionThemid-infraredemissivities(5-20μm)ofAl2O3-dopedCPI/AghybridfilmsincreasewithincreasingAl2O3content.Themid-infraredemissivitiesaremeasuredasε(0%)=87.54%,ε(5%)=92.15%,ε(10%)=92.23%,ε(15%)=93.25%,andε(20%)=94.51%,respectively.Thesolarreflectivities(0.4-2.5μm)decreasewithincreasingAl2O3content.Thesolarreflectivities(R)aremeasuredasR(0%)=94.81%,R(5%)=91.12%,R(10%)=89.31%,R(15%)=88.36%,andR(20%)=83.87%,respectively.ThisisbecausethescatteringeffectofthehybridfilmsincreaseswithincreasingAl2O3content.Thevisiblereflectivities(0.40-0.75μm)firstlyincreaseandthendecreasewithincreasingAl2O3content.The5%Al2O3-dopedCPI/Aghybridfilmhasthemaximumreflectanceinthevisibleband,whichcaneffectivelyimprovethenetcoolingpowerofthehybridfilm.Meanwhile,theintenseinteractionofAl2O3nanoparticleswiththemolecularchainscaneffectivelyenhancethethermostabilityofthehybridfilms.Comparedwith0%Al2O3-dopedCPIfilm,theglass-transitiontemperature(Tg)of5%Al2O3-dopedCPIfilmis328℃,whichisincreasedby22℃.ConclusionsTheAl2O3-dopedCPIhybridfilmwaspreparedbyasol-gelmethod.Theinfraredradiationincreasedduetothephonon-enhancedresonance,andthethermostabilityimprovedduetotheinteractionbetweenAl2O3nanoparticlesandmolecularchains.The5%Al2O3-dopedCPI/Aghybridfilmhadahighsolar(0.4-2.5μm)reflectivity(i.e.,91.12%)andamid-infrared(5-20μm)emissivity(i.e.,92.15%).Themaximumcoolingcapabilityof7.7℃and11.1℃thatwerelowerthanthatofbarealuminumdevicewasachievedundersunlight.TheAl2O3-dopedCPIhybridfilmexhibitedsuperiorthermostability(i.e.,Tg～328℃),andthermaldecompositiontemperature(i.e.,T5%～554℃).Theresultsindicatedaneffectivestrategytorealizeefficientradiativecoolingforelectronicdevicesandappendagesinspacecraft.
作者：梁冬冬 任杰 刘欢 杨映新 AtshaAmbar 孙莹 王聪 Author：LIANGDongdong RENJie LIUHuan YANGYingxin ATSHAAmbar SUNYing WANGCong
作者单位：北京航空航天大学能源与动力工程学院,北京100191北京航空航天大学物理学院,北京100191北京航空航天大学能源与动力工程学院,北京100191;北京航空航天大学集成电路科学与工程学院,北京100191;北京航空航天大学物理学院,北京100191
刊名：硅酸盐学报 ISTICEIPKU
Journal：JournaloftheChineseCeramicSociety
年，卷(期)：2024, 52(7)
分类号：TB34
关键词：柔性薄膜 辐射致冷 热稳定性 电子器件
Keywords：flexiblefilm radiativecooling thermostability electronicdevices
机标分类号：TQ323.5TB383O643.36
在线出版日期：2024年7月24日
基金项目：国家自然科学基金，国家自然科学基金Al2O3掺杂无色聚酰亚胺/Ag柔性薄膜的辐射致冷性能[
期刊论文] 硅酸盐学报--2024, 52(7)梁冬冬 任杰 刘欢 杨映新 AtshaAmbar 孙莹 王聪辐射致冷柔性薄膜作为冷却电子器件的候选材料受到广泛关注.然而材料和制备工艺的限制,很难同时具备优异的辐射致冷性能和热稳定性.通过溶胶凝胶法制备了Al2O3掺杂无色聚酰亚胺(CPI)薄膜,不仅利用Al2O3声子-增强共振增...参考文献和引证文献
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Al2O3掺杂无色聚酰亚胺/Ag柔性薄膜的辐射致冷性能.pdf |
