Department of Chemistry, Indian Institute of Technology, Kharagpur, India.
J Colloid Interface Sci. 2013 May 15;398:13-21. doi: 10.1016/j.jcis.2013.01.061. Epub 2013 Feb 7.
The article reports a simple photoactivation technique for the synthesis of chain like assembly of spherical Au nanocrystals using a nontoxic biochemical, β-cyclodextrin under ~365 nm UV-light irradiation. Under UV irradiation, β-cyclodextrin acts as a reducing as well as capping agent and eventually becomes a stabilizing linker for Au nanoparticles. The UV-visible spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD), and X-ray photoelectron spectroscopic techniques are employed to systematically characterize the Au nanochains. Additionally, it is shown that the Au nanocrystals act as an effective catalyst for the reduction in nitrobenzene to aniline and methylene blue to leuco methylene blue in presence of suitable reducing agent. The catalytic reduction reactions and kinetic parameters are evaluated from UV-visible spectroscopy.
该文报道了一种简单的光激活技术，用于在~365nmUV 光照射下，使用无毒的生化试剂β-环糊精合成链状组装的球形 Au 纳米晶体。在 UV 照射下，β-环糊精既作为还原剂又作为封端剂，最终成为 Au 纳米粒子的稳定连接剂。采用紫外-可见光谱、透射电子显微镜（TEM）、选区电子衍射（SAED）、X 射线衍射（XRD）和 X 射线光电子能谱技术对 Au 纳米链进行了系统的表征。此外，还表明 Au 纳米晶体在合适的还原剂存在下，可作为有效催化剂将硝基苯还原为苯胺，将亚甲基蓝还原为无色亚甲蓝。通过紫外-可见光谱评估了催化还原反应和动力学参数。
