Electrochemical tuning of the optical properties of nanoporous gold.
Electrochemical tuning of the optical properties of nanoporous gold.
复制标题
纳米多孔金光学性质的电化学调节
DOI：
10.1038/srep44139
复制
发表时间：
2017-03-09
影响因子：
4.6
通讯作者：
Eich M
中科院分区：
文献类型：
--
作者：
Jalas D;Shao LH;Canchi R;Okuma T;Lang S;Petrov A;Weissmüller J;Eich M
利用电化学环境中的光学原位测量，我们研究了纳米多孔金(NPG)光学超材料薄膜透射谱的电化学调谐，包括韧带尺寸的影响。在800 nm附近的透射谱的长波部分可以通过施加的电极电位进行可逆调谐。NPG表现为稀释的金属，其从介电到金属的响应转移到更长的波长。我们发现，外加的电势改变载流子密度的程度与金纳米粒子的实验相当。然而，与纳米颗粒相比，NPG光学超材料由于其连接的结构，在相同的载流子密度变化下，表现出更强和更宽的光传输变化。我们能够通过仅200 nm的薄样品将透射率调整30%。与电解液相结合，具有很大比表面积比的可调谐NPG基光学超材料有望在传感器、光电化学水分解为氢和氧以及太阳能水净化方面发挥重要作用。
Using optical in-situ measurements in an electrochemical environment, we study the electrochemical tuning of the transmission spectrum of films from the nanoporous gold (NPG) based optical metamaterial, including the effect of the ligament size. The long wavelength part of the transmission spectrum around 800 nm can be reversibly tuned via the applied electrode potential. The NPG behaves as diluted metal with its transition from dielectric to metallic response shifted to longer wavelengths. We find that the applied potential alters the charge carrier density to a comparable extent as in experiments on gold nanoparticles. However, compared to nanoparticles, a NPG optical metamaterial, due to its connected structure, shows a much stronger and more broadband change in optical transmission for the same change in charge carrier density. We were able to tune the transmission through an only 200 nm thin sample by 30%. In combination with an electrolyte the tunable NPG based optical metamaterial, which employs a very large surface-to-volume ratio is expected to play an important role in sensor applications, for photoelectrochemical water splitting into hydrogen and oxygen and for solar water purification.