Reversible assembly of metal nanoparticles induced by penicillamine. Dynamic formation of SERS hot spots

被引:74
作者
Taladriz-Blanco, Patricia [1 ,2 ]
Buurma, Niklaas J. [3 ]
Rodriguez-Lorenzo, Laura [1 ,2 ]
Perez-Juste, Jorge [1 ,2 ]
Liz-Marzan, Luis M. [1 ,2 ]
Herves, Pablo [1 ,2 ]
机构
[1] Univ Vigo, CSIC, Dept Quim Fis, Vigo 36310, Spain
[2] Univ Vigo, CSIC, Unidad Asociada, Vigo 36310, Spain
[3] Cardiff Univ, Sch Chem, Phys Organ Chem Ctr, Cardiff CF10 3AT, S Glam, Wales
基金
英国工程与自然科学研究理事会;
关键词
ISOTHERMAL TITRATION CALORIMETRY; GOLD NANOPARTICLES; SILVER COLLOIDS; BINDING; NANORODS; DNA; SURFACE; SHELL; THERMODYNAMICS; ADSORPTION;
D O I
10.1039/c1jm12175h
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
We report a systematic study of the surface modification of gold and silver nanoparticles with DL-penicillamine (PEN) and N-acetyl-DL-penicillamine (NAP), motivated by the possibility of inducing pH-controlled reversible nanoparticle assembly. The interaction of PEN and NAP with the metal nanoparticle surface was studied by isothermal titration calorimetry (ITC). The results indicate that equilibrium is reached with the formation of a submonolayer corresponding to ca. 40% and 64% of total surface coverage for PEN and NAP, respectively. Both PEN and NAP modified nanoparticles could be reversibly aggregated at acidic pH due to the protonation of the carboxylic groups, leading to a decrease in their stability by electrostatic interactions and the advent of hydrogen bonding interactions which promote interparticle linkage. The process was monitored by UV-Vis spectroscopy, transmission electron microscopy (TEM) and surface enhanced Raman scattering (SERS) spectroscopy. Interestingly, the SERS characterization demonstrated the pH-controlled formation of hot-spots.
引用
收藏
页码:16880 / 16887
页数:8
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