Here　a　variety　of　hierarchic　nanostructures　on　the　undoped　acceptor-rich　ZnO　(A-ZnO)　single-crystal　microtube　are　fabricated　by　KrF　excimer　laser　irradiation.　The　effects　of　process　parameters,　i.e.　laser　fluence　and　number　of　pulse　(NOP),　on　nanostructure　morphology　of　the　A-ZnO　microtube　are　investigated,　by　which　the　controllable　hierarchic　nanostructures　are　achieved.　The　mechanism　of　the　nanostructure　formation　is　attributed　to　self-assembled　growth　by　decomposition　and　re-nucleation　owing　to　rapid　heating　and　cooling　down　during　laser　irradiation　near　Zn-vacancy-related　point　defects.　The　Raman　and　photoluminescence　spectra　confirm　that　the　nanostructures　possess　massive　surface　defects,　e.g.　oxygen　vacancies　(V-o)　and　zinc　interstitials　(Zn-i).　The　electrical　resistivity　of　the　nanostructured　A-ZnO　microtube　is　down　to　similar　to　10(-)(3)　Omega　cm,　about　one　order　of　magnitude　lower　than　that　of　the　as-grown　A-ZnO　microtube.　The　great　ratio　of　surface　area　to　volume　of　the　nanostructures　realizes　the　improved　UV　detection　and　photodegradation　performance.　The　optimal　photoresponsivity　can　be　up　to　27.08　A/W　using　the　process　parameters　of　200　mJ/cm(2)　and　100　pulses.　The　catalytic　degradation　rate　of　the　A-ZnO　microtube　irradiated　by　150　mJ/cm(2)　and　200　pulses　with　6-nm　Au　nanoparticles　decoration　for　methylene　blue　solution　is　similar　to　3.4　times　higher　than　the　commercial　nanoparticles.　The　present　work　paves　a　new　way　to　design　and　fabricate　a　variety　of　hierarchic　nanostructures　on　undoped　A-ZnO　microtube　for　enhanced　electrical　and　photocatalytic　performance.　(C)　2019　Elsevier　B.V.　All　rights　reserved.