B50.06N1.87　nanorod　was　successfully　synthesized　by　the　technique　of　electrolysis,　using　a　solution　of　mixed　dimethylformamide　(HCON(CH3)(2))　and　boric　acid　(H3BO3)　as　the　electrolyte.　The　sample　was　characterized　by　XPS,　TEM　and　HRTEM.　These　nanorods　have　uniform　diameters　of　about　60　nm.　HRTEM　investigation　demonstrates　that　these　nanorods　have　a　uniform　crystalline　structure　of　tetragonal　B50.06N1.87　single　crystal,　and　the　growth　direction　of　the　nanorod　is　along　[001].　It　was　proposed　that　other　boron　nitrides　may　be　prepared　using　electrolysis　method.　(c)　2006　Elsevier　B.V.　All　rights　reserved.