I'm working on the synthesis of S-doped SrTiO3. In many researches i've read there are always the implement of 2-propanol or the mixture of ethylene glycol and citric acid or the mixture of ethanol, ethylene ether, ethylene glycerol, those procedure are chemistry-based methods. So i wonder what is the role of those substance and based on what criteria do we choose the substance and the ratio. Thank you all in advance!!!