Macroscopic Assembly of Gold Nanorods into Superstructures with Controllable Orientations by Anisotropic Affinity Interaction

被引：30

作者：

Rong, Yun ^{[1
,2
]}

Song, Liping ^{[1
,2
]}

Si, Peng ^{[3
]}

Zhang, Lei ^{[1
,2
]}

Lu, Xuefei ^{[1
]}

Zhang, Jiawei ^{[1
,2
]}

Nie, Zhihong ^{[4
]}

Huang, Youju ^{[1
,2
]}

Chen, Tao ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Marine Mat & Related Technol, Zhejiang Key Lab Marine Mat & Protect Technol, Ningbo 315201, Zhejiang, Peoples R China

[2] Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China

[3] Stanford Univ, Dept Struct Biol, Stanford, CA 94305 USA

[4] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA

来源：

LANGMUIR | 2017年 / 33卷 / 48期

关键词：

ENHANCED RAMAN-SCATTERING; SEMICONDUCTOR NANORODS; DROPLET EVAPORATION; SURFACE; NANOPARTICLES; ARRAYS; NANOSTRUCTURES; NANOCRYSTALS; MONOLAYERS;

D O I：

10.1021/acs.langmuir.7b03538

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Two-dimensional or three-dimensional highly ordered arrays of anisotropic nanoparticles provide attracting properties that are highly desired by the industry. Traditional assembly methods such as evaporation usually produces the nanostructure arrays only up to the millimeter scale with poor control of nanoparticle orientation) making them hardly applicable for industrial needs. Here, we report a facile method to assemble centimeter-scale gold nanorod (Au NR) arrays with highly controlled nanoparticle orientation and high reproducibility. We selectively functionalized the transverse or longitudinal facets of Au NRs with polyethylene glycol (PEG) molecules and utilized the interfacial polymeric affinity between the PEG domains on Au NRs and the PEGylated substrate to achieve the anisotropic self-assembly. The side-PEGylated Au NRs formed Closely packed horizontal arrays, whereas arrays on the substrate, respectively. The obtained Au NR arrays with different orientations showed anisotropic surface-enhanced Raman scattering (SERS) performance. We showed that the vertically ordered Au NR arrays exhibited 3 times higher SERS signals than the horizontally ordered arrays.

引用

页码：13867 / 13873

页数：7