作者：Hongxu Chen, Tieqiang Wang, Huaizhong Shen, Wendong Liu, Shuli Wang, Kun Liu, Junhu Zhang, Bai Y
关键字：colloidal lithography, nanoparticle/polymer composites, nanorod, barcode
论文来源：期刊
具体来源：Nano Res.
发表时间：2015年

We  demonstrate  a  facile  method  combining  colloidal  lithography,  selective

ion-exchange,  and  the  in  situ  reduction  of  Ag  ions  (Ag+)  for  the  fabrication

of  multi-segmented  barcode  nanorods.  First,  polymer  multilayer  films  were

prepared by spin-coating alternating thin films of polystyrene and polyacrylic

acid  (PAA),  and  then  multi-segmented  polymer  nanorods  were  fabricated  via

reactive  ion  etching  with  colloidal  masks.  Second,  Ag  nanoparticles  (Ag  NPs)

were  incorporated  into  the  PAA  segments  by  an  ion  exchange  and  the  in  situ

reduction of the Ag+. The selective incorporation of the Ag NPs permitted the

modification  of  the  specific  bars  of  the  nanorods.  Lastly,  the  Ag  NP/polymer

composite nanorods were released from the substrate to form suspensions for

further coding applications. By increasing the number of segments and changing

the length of each segment in the nanorods, the coding capacity of nanorods

was  improved.  More  importantly,  this  method  can  easily  realize  the  density

tuning  of  Ag  NPs  in  different  segments  of  a  single  nanorod  by  varying  the

composition  of  the  PAA  segments.  We  believe  that  numerous  other  coded

materials can also be obtained, which introduces new approaches for fabricating

barcoded nanomaterials.