Random networks of core-shell-like Cu-Cu(2)O/CuO nanowires as surface plasmon resonance-enhanced sensors.
Random networks of core-shell-like Cu-Cu(2)O/CuO nanowires as surface plasmon resonance-enhanced sensors.
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DOI：
10.1038/s41598-018-23119-6
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发表时间：
2018-03-16
影响因子：
4.6
通讯作者：
Kordas K
中科院分区：
文献类型：
--
作者：
Hajimammadov R;Bykov A;Popov A;Juhasz KL;Lorite GS;Mohl M;Kukovecz A;Huuhtanen M;Kordas K
原始未受保护的铜表面上快速形成氧化物限制了铜纳米材料在具有物理接触的电子和传感器组件中的直接应用。然而，目前尚不清楚生长的亚铜（Cu2O）和氧化铜（CuO）以及核壳状Cu-Cu2O/CuO纳米线的形成是否会对非接触式光学测量造成任何影响，在非接触式光学测量中，光吸收和随后的电荷振荡和分离分别发生在表面等离子体辅助和光催化过程中。因此，我们使用开尔文探针力显微镜在黑暗和光照下分析了水热合成的铜纳米线的表面电势如何在环境条件下随时间变化，以揭示纳米线和支撑金基板上的电荷积累。此外，我们对光学吸收进行有限元建模，以预测纳米结构的等离子体行为。结果表明，核壳状 Cu-Cu2O/CuO 纳米线可用于光催化和表面等离子体增强过程。在这里，通过利用后者，我们表明，无论天然表面氧化物的形成如何，金基板上纳米线的随机网络都可以作为表面增强拉曼光谱的出色放大介质，如罗丹明 6G 染料分子的传感所示。
The rapid oxide formation on pristine unprotected copper surfaces limits the direct application of Cu nanomaterials in electronics and sensor assemblies with physical contacts. However, it is not clear whether the growing cuprous (Cu2O) and cupric oxides (CuO) and the formation of core-shell-like Cu-Cu2O/CuO nanowires would cause any compromise for non-contact optical measurements, where light absorption and subsequent charge oscillation and separation take place such as those in surface plasmon-assisted and photocatalytic processes, respectively. Therefore, we analyze how the surface potential of hydrothermally synthetized copper nanowires changes as a function of time in ambient conditions using Kelvin probe force microscopy in dark and under light illumination to reveal charge accumulation on the nanowires and on the supporting gold substrate. Further, we perform finite element modeling of the optical absorption to predict plasmonic behavior of the nanostructures. The results suggest that the core-shell-like Cu-Cu2O/CuO nanowires may be useful both in photocatalytic and in surface plasmon-enhanced processes. Here, by exploiting the latter, we show that regardless of the native surface oxide formation, random networks of the nanowires on gold substrates work as excellent amplification media for surface-enhanced Raman spectroscopy as demonstrated in sensing of Rhodamine 6G dye molecules.
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影响因子：
5
作者：
Poreddy, Raju;Engelbrekt, Christian;Riisager, Anders
通讯作者：
Riisager, Anders
影响因子：
4.5
作者：
Sampson, WW
通讯作者：
Sampson, WW
影响因子：
4.6
作者：
Kravets VG;Jalil R;Kim YJ;Ansell D;Aznakayeva DE;Thackray B;Britnell L;Belle BD;Withers F;Radko IP;Han Z;Bozhevolnyi SI;Novoselov KS;Geim AK;Grigorenko AN
通讯作者：
Grigorenko AN
影响因子：
3.3
作者：
Clayton, Daniel A.;McPherson, Tyler E.;Hu, Dehong
通讯作者：
Hu, Dehong
DOI：
10.21307/ijssis-2017-465
发表时间：
2011-12-01
影响因子：
1.2
作者：
Parmar, Mitesh;Rajanna, K.
通讯作者：
Rajanna, K.