Materials Research Centre, Indian Institute of Science, Bangalore 560012, India.
Carbohydr Polym. 2013 Apr 15;94(1):229-34. doi: 10.1016/j.carbpol.2013.01.009. Epub 2013 Jan 16.
A low cost eco-friendly method for the synthesis of gold nanoparticles (AuNPs) using guar gum (GG) as a reducing agent is reported. The nanoparticles obtained are characterized by UV-vis spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Based on these results, a potential mechanism for this method of AuNPs synthesis is discussed. GG/AuNPs nanocomposite (GG/AuNPs NC) was exploited for optical sensor for detection of aqueous ammonia based on surface plasmon resonance (SPR). It was found to have good reproducibility, response times of ∼10 s and excellent sensitivity with a detection limit of 1ppb (parts-per-billion). This system allows the rapid production of an ultra-low-cost GG/AuNPs NC-based aqueous ammonia sensor.
本文报道了一种使用瓜尔胶（GG）作为还原剂来低成本合成金纳米粒子（AuNPs）的绿色环保方法。通过紫外可见光谱、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和 X 射线衍射（XRD）对所得到的纳米粒子进行了表征。基于这些结果，讨论了这种 AuNPs 合成方法的潜在机制。利用 GG/AuNPs 纳米复合材料（GG/AuNPs NC）作为基于表面等离子体共振（SPR）的光学传感器，用于检测水溶液中的氨。结果表明，该传感器具有良好的重现性、约 10 s 的响应时间和优异的灵敏度，检测限低至 1ppb（十亿分之一）。该系统允许快速制备基于超低成本 GG/AuNPs NC 的水溶液氨传感器。
