Electronic excitation induced tuning of surface plasmon resonance of Ag nanoparticles in fullerene C70 matrix
Electronic excitation induced tuning of surface plasmon resonance of Ag nanoparticles in fullerene C70 matrix
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DOI：
10.1088/0022-3727/42/15/155103
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
Rahul Singhal;D. Agarwal;Y. K. Mishra;Fouran Singh;J. Pivin;Ramesh Chandra;D. Avasthi
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文献类型：
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作者：
Rahul Singhal;D. Agarwal;Y. K. Mishra;Fouran Singh;J. Pivin;Ramesh Chandra;D. Avasthi
我们报道了电子激发诱导的表面等离子体共振（SPR）波长的银纳米粒子（NPs）在富勒烯C70矩阵的控制调谐。利用富勒烯C70在离子辐照下转变为非晶碳（a：C）的过程来调谐C70-Ag纳米复合薄膜的SPR波长。在120 MeV Ag离子以3 × 1013离子cm-2的能量密度照射时，记录到100 nm的蓝移。用透射电镜观察到银纳米粒子随能量密度的增加从7.0 ± 0.8 nm生长到11.0 ± 0.4 nm，并用热峰模型解释了这一现象。通过拉曼光谱证实了离子辐照富勒烯C70转化为无定形碳。这项工作证明了在所需波长处局部激发SPR的可能性，因此，在单个衬底上获得多个SPR带，这可能有助于开发更有效的光学传感器。
We report the electronic excitation induced controlled tuning of the surface plasmon resonance (SPR) wavelength of Ag nanoparticles (NPs) in fullerene C70 matrix. The transformation of fullerene C70 into amorphous carbon (a:C) under ion irradiation is used to tune the SPR wavelength of C70–Ag nanocomposite thin films. A 100 nm blue shift was recorded for irradiation at a fluence of 3 × 1013 ions cm−2 by 120 MeV Ag ions. A growth of Ag NPs from 7.0 ± 0.8 to 11.0 ± 0.4 nm with increasing fluence was observed by transmission electron microscopy and it is explained in the framework of thermal spike model. The transformation of fullerene C70 into amorphous carbon with ion irradiation was confirmed by Raman spectroscopy. This work demonstrates the possibility to locally excite the SPR at a desired wavelength and therefore, acquiring multiple SPR bands at a single substrate which could be useful in developing more efficient optical sensors.