Electrodeposition of thermally stable gold and silver nanoparticle ensembles through a thin alumina nanomask.
Electrodeposition of thermally stable gold and silver nanoparticle ensembles through a thin alumina nanomask.
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DOI：
10.1039/c0nr00230e
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发表时间：
2010-08
期刊：
影响因子：
6.7
通讯作者：
Yukina Takahashi;T. Tatsuma
中科院分区：
文献类型：
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作者：
Yukina Takahashi;T. Tatsuma
通过薄的Al（2）O（3）纳米掩模将半球形金或银纳米颗粒（Au和AgNP）集合体电沉积在光滑的ITO电极上。纳米掩模减小了颗粒尺寸和颗粒间距离的偏差。基于局域表面等离子体共振（LSPR）的吸收峰的AuNP系综红移与增加的环境折射率，这表明该系综将被用作LSPR传感器的化学分析和生物分析。Al（2）O（3）纳米掩模即使在500 ℃下也防止了Au和AgNP的热聚结，因此，它提高了纳米颗粒集合体的热稳定性。即使在退火后，系综也在可见光区显示出基于LSPR的吸收峰。纳米掩模允许AgNP（其在热和化学上比AuNP更不稳定）涂覆有烧结的TiO（2）。由此获得的ITO/AgNP/TiO（2）电极基于从银纳米颗粒到TiO（2）的光诱导电子转移而用作光电阴极。
Hemispheric gold or silver nanoparticle (Au and AgNP) ensembles were electrodeposited on a smooth ITO electrode through a thin Al(2)O(3) nanomask. The nanomask reduced the deviation in the particle size and interparticle distance. The absorption peak based on localized surface plasmon resonance (LSPR) of the AuNP ensemble redshifted with increasing environmental refractive index, suggesting that the ensemble would be used as a LSPR sensor for chemical analysis and bioanalysis. The Al(2)O(3) nanomask prevented the Au and AgNPs from thermal coalescence even at 500 degrees C, and consequently, it improved thermal stabilities of nanoparticle ensembles. The ensembles exhibit LSPR-based absorption peak in the visible region, even after annealing. The nanomask allowed AgNPs, which are thermally and chemically less stable than AuNPs, to be coated with sintered TiO(2). The ITO/AgNP/TiO(2) electrode thus obtained functions as a photocathode on the basis of photoinduced electron transfer from silver nanoparticles to TiO(2).