Synthesis And Properties Of One-dimensional Nanostructures At Sub-nanometer Scale

Compared with traditional large-size nanomaterials,the materials at sub-nanometer scale have emerged as a recent research focus because of their more obvious nanoscale-dependent physical and chemical properties.One-dimensional nanostructures possess special dimension related properties which are quite different from those of zero-and two-dimensional nanostructures.Thus one-dimensional nanostructures at sub-nanometer scale will exhibit more novel properties.In this regard,the present dissertation focuses on the synthesis of this class of nanomaterials and investigates their special properties,emphasizing on studying their polymer-analogous behaviors.The availability of electrospinning sub-1 nm GdOOH nanowires was demonstrated inspired by the observation of size-related viscosity of the nanowires dispersion.The electrospinning process constructed one-and two-dimensional superstructures with promising properties.This study demonstrated the polymer-analogous viscosity of the nanowires dispersion and related processing ability of the GdOOH nanowires with polymer-analogous dimension,providing inspiration for processing inorganic nanomaterials and exploring novel materials.Sub-1 nm nickel molybdate nanowires with large aspect ratio were synthesized based on a good/poor solvents synthetic system and exhibited promising electrochemical activity to oxygen evolution reaction.Owing to the sub-nanometer scale,the nanowires showed mechanical flexibility and could be assembled into half-transparent flexible film.High exposure of surface atoms of the sub-1 nm nanowires makes them possess superior electrocatalytic performance compared with large-size rods.The efforts made here can provide new model for investigating the world of one-dimensional nanostructures at sub-nanometer scale.A series of nickel phosphate single-walled nanotubes(SWNTs)were constructed based on the initiation of self-coiling of ultrathin nanostructures.Based on the mechanism,different alkali metal ions were utilized to tune their electrostatic interactions with curved intermediates for controlling the curving behaviors of ultrathin nanostructures and resulted diameters and lengths of the SWNTs.The compositions of the SWNTs were also varied through doping method,establishing nanomaterials withpromising performance on electrochemical activity to oxygen evolution reaction.The developed synthetic system is expected to bring novel insights into the controllable construction of inorganic SWNTs.