1 g CNTs was added into 25 ml of an aqueous HAuCl4 solution
(4.2 * 10-3 M) and 0.63 g urea (0.42 M). The initial pH
was about 2. The suspension thermostated at 80 degree, was
vigorously stirred for 8 h (pH increases) and then centrifuged,
washed and dried.
作者给出Au的含量是 Au content: 0.3 wt%.