Abstract

Starch films embedded with Ag nanoparticles (NPs), fabricated via solution casting, have been characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and UV–visible spectroscopy. The surface plasmon resonance (SPR) peak characteristic of Ag NPs is observed at 425 nm in the absorption spectra of the solution, while it appears in the range 438–449 nm for starch–Ag nanocomposites (Ncs). The size of the Ag NPs is 10.75 ± 0.8 nm as measured by TEM. Starch–Ag Nc films embedded with 0.50 wt% Ag NPs have minimal transmittance (1.3%) for electromagnetic radiation in the wavelength range 200–300 nm and 350–545 nm. Optical data was used to determine the refractive index, abbe number and dielectric function. Wemple-DiDomenico single oscillator model has been utilized to analyze the dispersion of refractive index and to investigate dispersion parameters. Sensitivity of the fabricated nanocomposite films to H₂O₂ has been demonstrated over a wide range (4 × 10⁻¹–0.3 × 10⁻⁶ M).

摘要

通过溶液浇铸制造的嵌入银纳米粒子 (NPs) 的淀粉薄膜已使用透射电子显微镜 (TEM)、扫描电子显微镜 (SEM)、X 射线衍射 (XRD)、拉曼光谱和紫外-可见光谱进行表征。在溶液吸收光谱的 425 nm 处观察到 Ag NPs 的表面等离子体共振 (SPR) 峰特征，而淀粉-Ag 纳米复合材料 (Ncs) 则出现在 438-449 nm 范围内。通过 TEM 测量, Ag NPs 的大小为 10.75 ± 0.8 nm。嵌入 0.50 wt% Ag NPs 的淀粉-Ag Nc 薄膜对波长范围 200-300 nm 和 350-545 nm 的电磁辐射具有最小的透射率 (1.3%)。光学数据用于确定折射率、阿贝数和介电函数。Wemple-DiDomenico 单振荡器模型已被用于分析折射率的色散和研究色散参数。制备的纳米复合薄膜对 H 的敏感性₂ O ₂已被证明在很宽的范围内（4 × 10 ^-1 –0.3 × 10 ^-6 M）。