采用表面活性剂发泡法制备三维多孔泡沫碳光吸收体,通过改变碳化温度调节泡沫碳有机质/C相对含量比,研究其与光吸收、导热率的关系,找到最优平衡点,综合优化太阳光水蒸发性能。结果表明,泡沫碳的碳化温度对泡沫碳中有机质/C相对含量比...采用表面活性剂发泡法制备三维多孔泡沫碳光吸收体,通过改变碳化温度调节泡沫碳有机质/C相对含量比,研究其与光吸收、导热率的关系,找到最优平衡点,综合优化太阳光水蒸发性能。结果表明,泡沫碳的碳化温度对泡沫碳中有机质/C相对含量比和孔结构有直接影响,有机质/C相对含量的降低可有效提高样品光吸收率,但也会引起隔热性能降低,使水蒸发体系热管理能力变差;碳化温度为600℃时,泡沫碳光吸收-热管理达到最优平衡点,获得最高的光吸收率(96.5%)和最优的太阳光水蒸发性能(1.0391 kg m^(-2)h^(-1)),其水蒸发率是纯水的2.08倍。展开更多
Printing is a method of additive manufacturing that can reduce material costs and environmental contamination during the fabrication process.Ag ink is commonly used in printed electronics,such as interconnects,inducto...Printing is a method of additive manufacturing that can reduce material costs and environmental contamination during the fabrication process.Ag ink is commonly used in printed electronics,such as interconnects,inductors,and antennas.However,the high cost of noble Ag restricts its massive applications.To reduce the cost of the state-of-the-art Ag ink and realize large-scale manufacturing,we develop a molecule-bridged graphene/Ag(MB-G/A)composite to produce highly conductive and cost-effective paperbased electronics.Graphene can be used to substitute part of Ag nanoparticles to reduce costs,form a conducive percolation network,and retain a reasonable level of conductivity.We adopt cysteamine as a molecular linker,because it anchors on the surface of graphene via the diazonium reaction.Additionally,the thiol functional group on the other end of cysteamine can bond to a Ag atom,forming a molecular bridge between graphene and Ag and promoting electron transport between Ag and graphene.As a result,the maximum conductivity of MB-G/A inks can reach 2.0×10^(5)S m^(−1),enabling their successful application in various printable electronics.In addition,the optimum MB-G/A ink costs less than half as much as pure Ag inks,showing the great potential of MB-G/A ink in commercial electronic devices.展开更多
文摘采用表面活性剂发泡法制备三维多孔泡沫碳光吸收体,通过改变碳化温度调节泡沫碳有机质/C相对含量比,研究其与光吸收、导热率的关系,找到最优平衡点,综合优化太阳光水蒸发性能。结果表明,泡沫碳的碳化温度对泡沫碳中有机质/C相对含量比和孔结构有直接影响,有机质/C相对含量的降低可有效提高样品光吸收率,但也会引起隔热性能降低,使水蒸发体系热管理能力变差;碳化温度为600℃时,泡沫碳光吸收-热管理达到最优平衡点,获得最高的光吸收率(96.5%)和最优的太阳光水蒸发性能(1.0391 kg m^(-2)h^(-1)),其水蒸发率是纯水的2.08倍。
基金financially supported by Hong Kong Scholars Program(XJ2019025)The Hong Kong Polytechnic University(CD42)Shenzhen Science and Technology Innovation Commission(JCYJ20180507183424383)。
文摘Printing is a method of additive manufacturing that can reduce material costs and environmental contamination during the fabrication process.Ag ink is commonly used in printed electronics,such as interconnects,inductors,and antennas.However,the high cost of noble Ag restricts its massive applications.To reduce the cost of the state-of-the-art Ag ink and realize large-scale manufacturing,we develop a molecule-bridged graphene/Ag(MB-G/A)composite to produce highly conductive and cost-effective paperbased electronics.Graphene can be used to substitute part of Ag nanoparticles to reduce costs,form a conducive percolation network,and retain a reasonable level of conductivity.We adopt cysteamine as a molecular linker,because it anchors on the surface of graphene via the diazonium reaction.Additionally,the thiol functional group on the other end of cysteamine can bond to a Ag atom,forming a molecular bridge between graphene and Ag and promoting electron transport between Ag and graphene.As a result,the maximum conductivity of MB-G/A inks can reach 2.0×10^(5)S m^(−1),enabling their successful application in various printable electronics.In addition,the optimum MB-G/A ink costs less than half as much as pure Ag inks,showing the great potential of MB-G/A ink in commercial electronic devices.
