I think one factor that plays a very important role in the addition of the surfactants is that what precursor you're using...

Here is the link which may help you to know the effects of surfactants on the semiconductor materials

http://pubs.rsc.org/en/content/articlelanding/2011/jm/c0jm03535a#!divAbstract

and

http://pubs.rsc.org/en/content/articlelanding/2013/ra/c2ra21963h#!divAbstract

Rarrukh Naveed 

I am synthesizing 1D  ZnO and TiO2, nanostructures and planning for CeO2 nanostrucures  

Examples: I started from TiO2 and NaOH to prepare TiO2 nanostructures and Zn(NO3)2.6H2O and NaOH to synthesize ZnO nanosturcures.