Preparation And Properties Of The Multicomponent Five-twin Noble Metal Nanostructures And The Mechanistic Study Of One-step High-yield Synthesis Of Hollow Pt-Ag Nanowire

Noble metal nanomaterials have been a focus of intense research,due to wide applications in biomedicine,energy catalysis and other fields.However compared with single metal nanostructure,it still has great challenge to synthesize multicomponent nanocrystals with controllable structure,morphology and size.To address this issue,we carried out the following researches in this dissertation:soft-templated seeded growth was used to synthesize penta-fold twinned segmented Au-Pd-Au nanocrystals through employing different Au nanostructures as seeds,their catalytic properties and growth mechanism were also investigated;Previously,our group synthesized hollow Pt-Ag nanowires,and their growth mechanism was systematically studied herein.?1?Au nanobipyramid and nanorods with high yield were synthesized via polyol reduction method,and then they serve as seeds to grow penta-fold twinned Pd-Au-Pd segmented nanorods.In our system,H₂PdCl₄,AA,KI,CTAB acted as precursor,reducing agent,growth-modifier,capping agent,respectively.Besids,we also studied the catalytic performance of products.?2?Previously,we developed a one-step method for synthesizing hollow Pt-Ag nanowires.In our system,Pt?OH?2 and AgCl was formed under the action of OH^-and Cl^-.Pt?OH?₂ and AgCl combined with AA into linear complex.Then Ag?I?was reduced to rich Ag solid nanowires.Subsequently,Pt?IV?and Ag nanowires had a galvanic reaction to get hollow nanowires.