Dynamics of laser excited colloidal gold nanoparticles functionalized with cysteine derivatives

Fălămaș, Alexandra; Toşa, Nicoleta; Toşa, V.

doi:10.1016/j.jqsrt.2015.03.011

Cited by 11 publications

(16 citation statements)

References 18 publications

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“…For instance, functionalization with cysteine and cystine amino acid derivatives produces subpicosecond delays in the relaxation times after excitation. 44 …”

Section: Pulse Laser-induced Reshaping and Fragmentationmentioning

confidence: 99%

Reshaping, Fragmentation, and Assembly of Gold Nanoparticles Assisted by Pulse Lasers

2016

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ConspectusThe vast majority of the outstanding applications of metal nanoparticles (NPs) developed during the last two decades have arisen from their unique optical properties. Within this context, rational synthesis and assembly of gold NPs have been the main research focus, aiming at the design of nanoplasmonic devices with tailored optical functionalities. The progress made in this field is thus to be ascribed to the understanding of the origin of the interaction between light and such gold nanostructures, the dynamics of which have been thoroughly investigated with significant contributions from short and ultrashort pulse laser technologies.We focus this Account on the potential of pulse lasers to provide new fundamental insights into the electron dynamics involved in the interaction of light with the free conduction electrons of Au NPs, that is, localized surface plasmon resonances (LSPRs). The excitation of LSPRs with a femtosecond pulse laser is followed by thermalization of the Au NP electrons and the subsequent relaxation of the nanocrystal lattice and the surrounding environment, which generally results in surface melting. By contrast, nanosecond irradiation usually induces AuNP fragmentation and uncontrolled melting due to overlapping excitation and relaxation phenomena. These concepts have been exploited toward the preparation of highly monodisperse gold nanospheres via pulse laser irradiation of polyhedral nanocrystal colloids, or in the fabrication of nanostructures with “written-in” optical properties. The applicability of pulsed coherent light has been extended toward the direct synthesis and manipulation of Au NPs. Through ablation of a gold target in a liquid with pulse lasers, spherical Au NPs can be synthesized with no need of stabilizing ligands, which is a great advantage in terms of reducing toxicity, rendering these NPs particularly suitable for medical applications. In addition, femtosecond laser irradiation has been proven a unique tool for the controlled welding of plasmonic gold nanostructures by electromagnetic field enhancement at the hot spots of assembled Au NPs. The combination of such nanostructures with pulse lasers promises significant chemical and biochemical advances, including the structural determination of organic reaction intermediates, the investigation of phase transitions in inorganic nanomaterials at mild reaction conditions, or the efficient photothermal destruction of cancer cells avoiding damage of surrounding tissue.

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“…For instance, functionalization with cysteine and cystine amino acid derivatives produces subpicosecond delays in the relaxation times after excitation. 44 …”

Section: Pulse Laser-induced Reshaping and Fragmentationmentioning

confidence: 99%

Reshaping, Fragmentation, and Assembly of Gold Nanoparticles Assisted by Pulse Lasers

2016

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“…[8][9][10][11] The main purpose of this choice is dictated by the fact that in order to be accepted and tolerated by the environment in which they are inserted, these new nano-devices should mimic nature, and at the same time, be effective and functional in their tasks. 12 Due to its unique properties, gold is one of the selected ingredients and nanoparticles made of gold (AuNPs) are among the most popular actors on the scientific and technological stages.…”

Section: Introductionmentioning

confidence: 99%

Decoration of gold nanoparticles with cysteine in solution: reactive molecular dynamics simulations

2016

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The dynamics of gold nanoparticle functionalization by means of adsorption of cysteine molecules in water solution is simulated through classical reactive molecular dynamics simulations based on an accurately parametrized force field. The adsorption modes of the molecules are characterized in detail disclosing the nature of the cysteine-gold interactions and the stability of the final material. The simulation results agree satisfactorily with recent experimental and theoretical data and confirm previous findings for a similar system. The covalent attachments of the molecules to the gold support are all slow physisorptions followed by fast chemisorptions. However, a great variety of binding arrangements can be observed. Interactions with the adsorbate caused surface modulations in terms of adatoms and dislocations which contributed to strengthen the cysteine adsorption.

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“…The need to create new complex hierarchical multi‐component materials with specific properties and finely tuned responses for potential applications in nanobiotechnologies, such as drug delivering, detection, imaging, electroanalytical sensing, etc., has aroused the interest in the scientific community to focus the research related to these fields on each single step of the designing procedure, namely substrate preparation, surface engineering, molecular adsorption, and composite stabilization . This could improve control of the various phases and be a convenient strategy to optimize the production chain and the final results.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study of the Adsorption Mechanism of Cystine on Au(110) in Aqueous Solution

Monti

Carravetta

Ågren

2016

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The adsorption and dynamics of cystine, which is the oxidized dimer of cysteine where the monomers are connected through a disulfide bond, on the Au(110) surface, in water solution, is characterized by means of classical molecular dynamics simulations based on a recently developed reactive force field (ReaxFF). The adopted computational procedure and the force field description are able to give a complete and reliable picture, in line with experiments, of the molecule behavior in solution and in close contact with the metal support. Many different aspects, which have never been explored computationally at this level of theory, are disclosed, namely, physisorption, chemisorption, disulfide bridge breaking/creation, and formation of staples. It is demonstrated that all these events are connected with the specific orientation and location of cystine on the substrate. Simulations in pure water reveal that the disulfide bridge is stable, whereas dissociation is observed on gold. This is favored at low coverage, whereas at high coverage both intact and dissociated forms can be observed depending on local arrangements. The computed photoemission spectra at different K-edges for the predicted adsorbate structures satisfactorily agree with the experimental measurements extracted from literature.

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Dynamics of laser excited colloidal gold nanoparticles functionalized with cysteine derivatives

Cited by 11 publications

References 18 publications

Reshaping, Fragmentation, and Assembly of Gold Nanoparticles Assisted by Pulse Lasers

Reshaping, Fragmentation, and Assembly of Gold Nanoparticles Assisted by Pulse Lasers

Decoration of gold nanoparticles with cysteine in solution: reactive molecular dynamics simulations

Theoretical Study of the Adsorption Mechanism of Cystine on Au(110) in Aqueous Solution

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