Surface interactions of gold nanorods and polysaccharides: From clusters to individual nanoparticles

被引:48
作者
de Barrosa, Heloise Ribeiro [1 ]
Piovan, Leandro [1 ]
Sassaki, Guilherme L. [2 ]
Sabry, Diego de Araujo [2 ]
Mattoso, Ney [3 ]
Nunes, Abner Magalhaes [4 ]
Meneghetti, Mario R. [4 ]
Riegel-Vidotti, Izabel C. [1 ]
机构
[1] Univ Fed Parana UFPR, Dept Quim, Grp Pesquisa Macromol & Interfaces, CxP 19081, BR-81531980 Curitiba, Parana, Brazil
[2] Univ Fed Parana UFPR, Dept Bioquim & Biol Mol, CxP 19046, BR-81531980 Curitiba, Parana, Brazil
[3] Univ Fed Parana UFPR, Dept Fis, CxP 19044, BR-81531980 Curitiba, Parana, Brazil
[4] Univ Fed Alagoas, Inst Quim & Biotecnol, Grp Catalise & Reatividade Quim, Av Lourival de Melo Mota S-N, BR-57072970 Maceio, AL, Brazil
关键词
Gold nanorods; Sulfated chitosan; Surface interactions; Self-assembling; SELF-ASSEMBLED MONOLAYERS; ASPECT-RATIO; CHITOSAN; GROWTH; CTAB; FUNCTIONALIZATION; STABILIZATION; CHARGE;
D O I
10.1016/j.carbpol.2016.07.018
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Gold nanorods (AuNRs) are suitable for constructing self-assembled structures for the development of biosensing devices and are usually obtained in the presence of cetyltrimethylammonium bromide (CTAB). Here, a sulfated chitosan (ChiS) and gum arabic (GA) were employed to encapsulate CTAB/AuNRs with the purpose of studying the interactions of the polysaccharides with CTAB, which is cytotoxic and is responsible for the instability of nanoparticles in buffer solutions. The presence of a variety of functional groups such as the sulfate groups in ChiS and the carboxylic groups in GA, led to efficient interactions with CTAB/AuNRs as evidenced through UV-vis and FTIR spectroscopies. Electron microscopies (HR-SEM and TEM) revealed that nanoparticle clusters were formed in the GA-AuNRs sample, whereas individual AuNRs, surrounded by a dense layer of polysaccharides, were observed in the ChiS-AuNRs sample. Therefore, the presented work contributes to the understanding of the driving forces that control the surface interactions of the studied materials, providing useful information in the building-up of gold self-assembled nanostructures. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:479 / 486
页数:8
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