Absorption spectroscopy of gold nanoisland films: optical and structural characterization
Absorption spectroscopy of gold nanoisland films: optical and structural characterization
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DOI：
10.1088/0957-4484/20/2/025703
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发表时间：
2009-01-14
期刊：
影响因子：
3.5
通讯作者：
Kajikawa, K.
中科院分区：
文献类型：
--
作者：
Gupta, G.;Tanaka, D.;Kajikawa, K.
通过在高温下退火薄的金膜制备的纳米岛薄膜，使用扫描电子显微镜（SEM）和原子力显微镜成像，并通过吸收光谱进行光学表征。在500，700和900 ℃退火的有效厚度为2，5和7 nm的薄金膜的制造和实验研究。测量的吸收特性支持理论计算表明，金岛的形状是部分球形。用s偏振光或在垂直入射下测量的峰值吸收波长的位置证实，随着退火温度的增加，岛状从近半球向球体生长。SEM图像证实，随着膜厚度从2 nm增加到5 nm，岛的尺寸从直径15 nm增加到直径40 nm。通过比较石英和LaSF 15玻璃衬底上的金岛薄膜的吸收光谱，研究了衬底材料折射率对吸收特性的影响。建议使用金纳米岛膜制备局域表面等离子体共振基底，因为它们比金胶体膜具有优势。
Nanoisland films prepared by annealing thin gold films at high temperatures were imaged using scanning electron microscopy (SEM) and atomic force microscopy, and optically characterized through absorption spectroscopy. Thin gold films of effective thicknesses 2, 5 and 7 nm annealed at 500, 700 and 900 degrees C were fabricated and studied experimentally. The measured absorption characteristics in support of theoretical calculations showed that the shapes of gold islands were partial spheres. The position of the peak absorption wavelength measured with s-polarized light or at normal incidence confirmed that the island shape grew from a near-hemisphere towards a sphere with increasing annealing temperature. The SEM images confirmed that the size of islands increased from 15 nm in diameter to 40 nm in diameter as film thickness increased from 2 to 5 nm. The affect of the index of the substrate material on absorption characteristics were also studied by comparing the absorption spectra of gold island films on quartz and LaSF15 glass substrates. The use of gold nanoisland films for preparing localized surface plasmon resonance substrates was suggested as they held advantages over the gold colloid films.