Method A. Firstly, CdS were prepared by the same hydrothermal
method mentioned before except for the hydrothermal
process lasting 12 h (nNaOH ¼ 0.06 mol). Secondly, CNTs were
added into the cooled solution and dispersed by ultrasound
for 1 h. The obtained mixture was treated by the same hydrothermal
condition for another 12 h. After cooling, the
product was separated by centrifugation, washed with
deionized water and ethanol for several times, and dried at
343 K for 10 h in a vacuum oven