看你回流时间了,正常的话是会被部分还原的,只是还原程度的多少而已。应该是GO表面的官能团跟Ag离子发生作用,GO变成了RGO而Ag被还原。你可以看看这篇文献:A facile one-step way to anchor noble metal (Au, Ag, Pd) nanoparticles on the reduced graphehe oxide mat with catalytic activity for selective reduction of nitromatic compounds