CdS　nanobubbles　and　Cd-DMS　nanosheets　have　been　prepared　by　a　solvothermal　method　from　a　solution　of　Cd2+　in　dimethyl　sulfoxide　in　the　absence　of　elemental　S.　A　formation　mechanism　for　the　nanobubble　morphology　arising　during　the　CdS　nanocrystal　growth　has　been　proposed,　based　on　the　results　of　transmission　electron　microscopy　and　photoluminescence　spectrophotometry.　The　correlation　of　the　morphology　with　reaction　time　was　also　suggested,　and　may　be　applicable　to　the　solvothermal　synthesis　of　other　nanomaterials.　Copyright　©　2013　American　Scientific　Publishers　All　rights　reserved.