One-pot preparation of thin nanoporous copper foils with enhanced light absorption and SERS properties
One-pot preparation of thin nanoporous copper foils with enhanced light absorption and SERS properties
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DOI：
10.1039/c4ce01967a
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发表时间：
2015-01
期刊：
影响因子：
3.1
通讯作者：
Ming Li;Yanjie Su;Jiang Zhao;H. Geng;Jing Zhang;Liling Zhang;Chao Yang;Yafei Zhang
中科院分区：
文献类型：
--
作者：
Ming Li;Yanjie Su;Jiang Zhao;H. Geng;Jing Zhang;Liling Zhang;Chao Yang;Yafei Zhang
本文提出了一种简单的水热法制备厚度为~1.4 μm，面积为~10 cm2的独立型纳米多孔铜箔（NPCFs）的方法，该方法通过组装和还原CuxO纳米颗粒中间体，在聚四氟乙烯热压釜内壁上生长，然后在反应冷却期间自行剥离。NPCFs的孔径可以通过改变反应时间来调节。观察到纳米孔内吸水的NPCFs具有优异的柔韧性，而干燥的NPCFs具有高度疏水性。与市售的铜箔相比，由于纳米多孔性，合成的NPCFs具有更强的吸收200 ~ 1000 nm波长范围内的光的能力。在300 nm处吸光度最高，增强幅度最大，达到86%，在575 nm处增强幅度最大，达到43%。以罗丹明6G为探针分子制备的半球形NPCFs光滑面具有优异的表面增强拉曼散射性能，与时域有限差分模拟结果吻合较好。
A facile hydrothermal method has been presented to prepare free-standing nanoporous Cu foils (NPCFs) having a thickness of ~1.4 μm and an area of up to ~10 cm2, which were grown on the inwall of a Teflon-lined autoclave by assembling and reducing CuxO nanoparticle intermediates and then peeling themselves off in the cooling period of the reaction. The pore sizes of NPCFs can be adjusted by varying the reaction time. It is observed that the NPCFs with water absorbed inside their nanopores show excellent flexibility while dried ones exhibit a highly hydrophobic nature. Compared with commercially available Cu foils, the as-synthesized NPCFs show enhanced ability to absorb light over a wide range of wavelengths from 200 to 1000 nm because of their nanoporosity. The highest absorbance and the biggest enhancement can reach 86% at 300 nm and 43% at 575 nm, respectively. The smooth side of NPCFs with a hemisphere-like surface demonstrates outstanding surface-enhanced Raman scattering performance by employing Rhodamine 6G as the probe molecule, which agrees well with the results of finite-difference time-domain simulation.