Zhang Hong, Hu Naifei
Department of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China.
J Phys Chem B. 2007 Sep 6;111(35):10583-90. doi: 10.1021/jp0741556. Epub 2007 Aug 15.
PAMAM-Au nanocomposites prepared by reduction of HAuCl4 with NaBH4 in the presence of the sixth-generation polyamidoamine (PAMAM) took a unique structure, in which the 2 nm-sized Au nanoparticles were encapsulated in the interior cavities of the PAMAM molecules. The PAMAM-Au nanocomposites as a new type of nanomaterial were assembled layer-by-layer with myoglobin (Mb) into {PAMAM-Au/Mb}n films on solid surfaces, which was confirmed by quartz crystal microbalance (QCM), UV-vis spectroscopy, and cyclic voltammetry (CV). The direct electrochemistry of Mb in the films assembled on pyrolytic graphite (PG) electrodes was realized and used to catalyze the reduction of hydrogen peroxide. As compared to {PAMAM/Mb}n films containing no Au nanoparticles, the {PAMAM-Au/Mb}n films showed much better electrochemical and electrocatalytic properties, indicating the conductive effect of Au nanoparticles inside PAMAM on bridging electron transfer between Mb and PG electrodes.
通过在第六代聚酰胺胺（PAMAM）存在下用硼氢化钠还原氯金酸制备的PAMAM-Au纳米复合材料具有独特的结构，其中2纳米大小的金纳米颗粒被包裹在PAMAM分子的内部空腔中。作为一种新型纳米材料的PAMAM-Au纳米复合材料与肌红蛋白（Mb）逐层组装在固体表面形成{PAMAM-Au/Mb}n膜，这通过石英晶体微天平（QCM）、紫外可见光谱和循环伏安法（CV）得到证实。实现了Mb在热解石墨（PG）电极上组装的膜中的直接电化学，并用于催化过氧化氢的还原。与不含金纳米颗粒的{PAMAM/Mb}n膜相比，{PAMAM-Au/Mb}n膜表现出更好的电化学和电催化性能，表明PAMAM内部的金纳米颗粒对桥接Mb与PG电极之间的电子转移具有导电作用。
