Synthesis of oxocarbon-encapsulated gold nanoparticles with blue-shifted localized surface plasmon resonance by pulsed laser ablation in water with CO2 absorbers

被引：21

作者：

Del Rosso, T. ^{[1
]}

Rey, N. A. ^{[2
]}

Rosado, T. ^{[2
]}

Landi, S. ^{[3
]}

Larrude, D. G. ^{[4
]}

Romani, E. C. ^{[1
]}

Freire Junior, F. L. ^{[1
]}

Quinteiro, S. M. ^{[5
]}

Cremona, M. ^{[1
,3
]}

Aucelio, R. Q. ^{[2
]}

Margheri, G. ^{[6
]}

Pandoli, O. ^{[2
]}

机构：

[1] Pontificia Univ Catolica Rio de Janeiro, Dept Phys, Rua Marques de Sao Vicente, BR-22451900 Rio De Janeiro, Brazil

[2] Pontificia Univ Catolica Rio de Janeiro, Dept Chem, Rua Marques de Sao Vicente, BR-22451900 Rio De Janeiro, Brazil

[3] Natl Inst Metrol Standardizat & Ind Qual INMETRO, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, Brazil

[4] Univ Prebiteriana Mackenzie, Graphene & Nanomat Res Ctr Mackgraphe, Sao Paulo, Brazil

[5] Pontificia Univ Catolica Rio de Janeiro, Dept Mech Engn, Rua Marques de Sao Vicente, BR-22451900 Rio De Janeiro, Brazil

[6] CNR, Inst Complex Syst, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy

来源：

NANOTECHNOLOGY | 2016年 / 27卷 / 25期

关键词：

oxocarbons-encapsulated gold nanoparticles; localized surface plasmon resonance; pulsed laser ablation in liquid; surface enhanced Raman spectroscopy; amino glycoside antibiotic sensing; ENHANCED RAMAN-SPECTROSCOPY; AU NANOPARTICLES; FT-IR; CARBON; SERS; ELECTRODES; CHEMISTRY; MECHANISM; ACID; REDUCTION;

D O I：

10.1088/0957-4484/27/25/255602

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Colloidal suspensions of oxocarbon-encapsulated gold nanoparticles have been synthesized in a one-step procedure by pulsed-laser ablation (PLA) at 532 nm of a solid gold target placed in aqueous solution containing CO2 absorbers, but without any stabilizing agent. Multi-wavelength surface enhanced Raman spectroscopy allows the identification of adsorbed amorphous carbon and graphite, Au-carbonyl, Au coordinated CO2-derived bicarbonates/carbonates and hydroxyl groups around the AuNPs core. Scanning electron microscopy, energy dispersive x-ray analysis and high resolution transmission electron microscopy highlight the organic shell structure around the crystalline metal core. The stability of the colloidal solution of nanocomposites (NCs) seems to be driven by solvation forces and is achieved only in neutral or basic pH using monovalent hydroxide counter-ions (NaOH, KOH). The NCs are characterized by a blue shift of the localized surface plasmon resonance (LSPR) band typical of metal-ligand stabilization by terminal p-back bonding, attributed to a core charging effect caused by Au-carbonyls. Total organic carbon measurements detect the final content of organic carbon in the colloidal solution of NCs that is about six times higher than the value of the water solution used to perform PLA. The colloidal dispersions of NCs are stable for months and are applied as analytical probes in amino glycoside antibiotic LSPR based sensing.

引用

页数：11

共 68 条

[1] Synthesis of gold nanoparticles by laser ablation in toluene: Quenching and recovery of the surface plasmon absorption [J].