iO2-GeO2 SolS Were alSo be prepared by performing each Single or tWo or three StepS in the proceSSing mentioned above.Thin-film SampleS Were prepared by dip-coating flat pol-iShed fuSed Silica glaSS aS a SubStrate.The glaSS Slide WaS ultraSonically WaShed in acidic and alkaline WaShing li,...