In　this　study,　single-crystal　γ-MnO2　nanowires　have　been　successfully　synthesized　at　room　temperature　in　the　absence　of　catalysts　or　templates,　the　diameter　was　found　to　be　ca.　10-20　nm　and　the　characteristic　lengths　up　to　several　micrometers.　The　crystal　phase　of　nanowires　was　confirmed　by　XRD　and　TEM　measurements.　Further,　a　dissolution-　condensation-recrystallization　process　was　proposed　for　the　formation　of　nanowires　under　the　room　temperature　condition.　©　2008　Elsevier　B.V.　All　rights　reserved.