Polydiacetylene-Functionalized Noble Metal Nanocages

被引：30

作者：

Demartini, Anna ^{[1
,2
]}

Alloisio, Marina ^{[1
,2
]}

Cuniberti, Carla ^{[1
,2
]}

Dellepiane, Giovanna ^{[1
,2
]}

Jadhav, Sushilkumar A. ^{[1
,2
]}

Thea, Sergio ^{[1
,2
]}

Giorgetti, Emilia ^{[3
,4
]}

Gellini, Cristina ^{[5
]}

Muniz-Miranda, Maurizio ^{[3
,5
]}

机构：

[1] INSTM, I-16146 Genoa, Italy

[2] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy

[3] INSTM, I-50019 Florence, Italy

[4] CNR, Ist Sistemi Complessi, I-50019 Florence, Italy

[5] Univ Florence, Dipartimento Chim, I-50019 Florence, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 45期

关键词：

TRANSMETALATION REACTION; REPLACEMENT REACTION; CHITOSAN FILMS; GOLD; NANOPARTICLES; SEPARATION; NANOSTRUCTURES; NANOSPHERES; FABRICATION; MORPHOLOGY;

D O I：

10.1021/jp905787h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Stable chitosan-protected noble metal nanocages of relatively small size (similar to 50 nm) were successfully synthesized by the galvanic replacement reaction between the corresponding silver nanoparticles and HAuCl4 in aqueous suspension. A broad surface plasmon band peaked around 700 nm and extended to the near-infrared was observed by properly changing the experimental conditions. To test the performance, the nanocages were functionalized with 10, 12-pentacosadiynoic acid (PCDA) chains and then irradiated with UV light to induce monomer polymerization. A very high polymer conversion was observed. The time evolution of the electronic absorption and Raman spectra showed a variety of polydiacetylenic forms, including the unusual highly delocalized bluish-green phase. The nanocages act as surface-enhanced Raman scattering (SERS) active substrates with all Our available excitation lines and show improved Raman activity in comparison with data from both silver and gold colloids. The shift of the plasmonic band to the NIR is expected to magnify the nonlinear response of polydiacetylene in this region.

引用

页码：19475 / 19481

页数：7

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