Sneha Krishnamurthy, Yn Lee Shi, Yeoung-Sang Yun
J Nanosci Nanotechnol. 2015 Jan;15(1):326-9. doi: 10.1166/jnn.2015.8351.
We demonstrate the effects extract amount, pH and temperature on the formation of gold nanoparticles (AuNP) using Ocimum santum plant extract. The average AuNP size, shape, and particle number can be controlled by simply varying the pH, temperature and amount of plant extract in the reaction medium. Acidic pH was found to be ideal for the formation of AuNPs. UV-visible spectra for the reaction of the plant extract with 1 mM HAuCl4 solution showed that the highest intensity of surface plasmon resonance (SPR) occurred at pH 3. Transmission electron microscopy (TEM) showed that temperature can be used to control the aspect ratio and the relative amount of gold nanoplatelets (triangular and hexagonal). Increasing the temperature decreased the population of gold nanoplatelets and increased the number of spherical NPs, and nanoplatelet population was found to be highest at 20 degrees C and 30 degrees C.
我们展示了使用罗勒植物提取物时，提取物用量、pH值和温度对金纳米颗粒（AuNP）形成的影响。通过简单改变反应介质中植物提取物的pH值、温度和用量，可以控制AuNP的平均尺寸、形状和颗粒数量。发现酸性pH值对于AuNP的形成是理想的。植物提取物与1 mM HAuCl4溶液反应的紫外可见光谱表明，表面等离子体共振（SPR）的最高强度出现在pH 3时。透射电子显微镜（TEM）表明，温度可用于控制金纳米片（三角形和六边形）的纵横比和相对数量。升高温度会减少金纳米片的数量并增加球形NP的数量，并且发现金纳米片数量在20摄氏度和30摄氏度时最高。
