Photochemically-assisted synthesis of non-toxic and biocompatible gold nanoparticles

Teixeira, Priscila Rios; Santos, Mayara S.C.; Silva, Ana Luísa G.; Báo, Sônia Nair; Azevedo, Ricardo Bentes; Sales, Maria J. A.; Paterno, Leonardo G.

doi:10.1016/j.colsurfb.2016.09.002

Cited by 37 publications

(18 citation statements)

References 26 publications

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“…On the other hand, UV irradiation can also be used as the sole reducing agent without any chemical or biological reductants. To that aim, Teixeira et al relied on 254-nm UV radiation as the light source and polyethyleneimine (PEI) as the stabilizing agent [ 113 ]. Besides a stabilizing-free experiment (the control), the concentrations of HAuCl 4 (precursor) and PEI were varied ([PEI]:[HAuCl 4 ] of 5:1, 10:1, and 20:1) to study their impact on the NP size.…”

Section: Synthesis Of Gold and Silver Nanoparticles Under Uv Light Irradiationmentioning

confidence: 99%

Photochemical Synthesis of Gold and Silver Nanoparticles—A Review

et al. 2021

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Nanomaterials have supported important technological advances due to their unique properties and their applicability in various fields, such as biomedicine, catalysis, environment, energy, and electronics. This has triggered a tremendous increase in their demand. In turn, materials scientists have sought facile methods to produce nanomaterials of desired features, i.e., morphology, composition, colloidal stability, and surface chemistry, as these determine the targeted application. The advent of photoprocesses has enabled the easy, fast, scalable, and cost- and energy-effective production of metallic nanoparticles of controlled properties without the use of harmful reagents or sophisticated equipment. Herein, we overview the synthesis of gold and silver nanoparticles via photochemical routes. We extensively discuss the effect of varying the experimental parameters, such as the pH, exposure time, and source of irradiation, the use or not of reductants and surfactants, reagents’ nature and concentration, on the outcomes of these noble nanoparticles, namely, their size, shape, and colloidal stability. The hypothetical mechanisms that govern these green processes are discussed whenever available. Finally, we mention their applications and insights for future developments.

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Section: Synthesis Of Gold and Silver Nanoparticles Under Uv Light Irradiationmentioning

confidence: 99%

Photochemical Synthesis of Gold and Silver Nanoparticles—A Review

et al. 2021

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“…The initial results suggest one that both starch and UV radiation are essential to prepare sizeable amounts of AgNPs in a short period of time reaction. In a previous contribution [34], it was identified the exact roles played by polymer and UV radiation on the photochemically-assisted synthesis of gold nanoparticles (AuNP). It was concluded that while the polymer, in that case polyethylene imine, was responsible only for controlling the nucleation step of AuNP formation, the UV radiation provided the minimum energy (or activation energy) for Au(III) species transform successively into lower redox Au species until zero valence Au.…”

Section: The Role Of Starch and Uv Radiation For The Agnps Synthesismentioning

confidence: 99%

Original photochemical synthesis of Ag nanoparticles mediated by potato starch

et al. 2019

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In this contribution, we report an original photochemical method and its mechanism, in which Ag nanoparticles (AgNPs) are formed in the presence of starch. AgNO 3 /potato starch aqueous suspensions are irradiated (254 nm, 8 W) at room temperature and the Ag + /starch ratio can be varied to tune the size of AgNPs. The evolution of the AgNPs plasmon resonance band during the reaction is monitored by UV-Vis spectroscopy and evidences that AgNPs are formed in a two-stage process combining nucleation and growth, with the nucleation being controlled by the amount of added starch. Moreover, infrared and Raman spectra indicates that starch undergoes oxidation simultaneously to Ag + reduction, even though starch alone is not capable of reducing Ag + at an appreciable rate and UV irradiation is essential to produce sizeable amounts of AgNPs. Transmission electron microscopy reveals that AgNPs are nearly spherical with diameters ranging between 13 and 8 nm. The AgNPs/starch suspensions exhibit hydrodynamic diameters between 150 and 200 nm and zeta potentials very close to zero. Since AgNPs/starch suspensions are very stable over time, the colloidal stability is ensured by the steric hindrance imposed by starch rather than electrostatic repulsion.

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“…To prepare AuNPs with a controlled size and morphology on a large scale, one can use chemical synthesis, [ 13–15 ] gamma ray‐assisted synthesis, [ 16 ] photochemically assisted synthesis, [ 17,18 ] ultrasonically assisted synthesis, [ 19 ] in‐water laser ablation of gold, [ 20,21 ] and biosynthesis. [ 22,23 ] However, if the AuNPs synthesized in solution are used to fabricate micropatterned plasmonic devices and sensors, additional elaborate processes, such as inkjet printing and nanoimprinting, [ 24–26 ] have to be further applied to deposit such AuNPs on a substrate (commonly referred to a plasmonic AuNP substrate).…”

Section: Introductionmentioning

confidence: 99%

Direct Printing of Micropatterned Plasmonic Substrates of Size‐Controlled Gold Nanoparticles by Precision Photoreduction

Zhang

Liang

Zhang

et al. 2020

Advanced Optical Materials

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spectra and a greatly enhanced local electromagnetic field. [4] Because of these unique competences, AuNPs have shown promise in many applications, such as photonic devices and meta-materials, [5,6] organic and biomolecule sensing, [7] drug/ gene/protein delivery, [8] plasmonic photothermal therapy, [9] storage systems, [10] plasmonic solar cells, [11] and plasmonic photocatalysis. [12] To prepare AuNPs with a controlled size and morphology on a large scale, one can use chemical synthesis, [13-15] gamma ray-assisted synthesis, [16] photochemically assisted synthesis, [17,18] ultrasonically assisted synthesis, [19] in-water laser ablation of gold, [20,21] and biosynthesis. [22,23] However, if the AuNPs synthesized in solution are used to fabricate micropatterned plasmonic devices and sensors, additional elaborate processes, such as inkjet printing and nanoimprinting, [24-26] have to be further applied to deposit such AuNPs on a substrate (commonly referred to a plasmonic AuNP substrate). Moreover, one of the growing demands involves fabrication of micropatterns of AuNPs that enable the integration of multiple size-varied AuNPs for different purposes in photonic microsystems, such as lab-on-chip devices. To meet such a demand, electron-beam litho graphy (EBL) and EBL-based nanoimprinting have been used to precisely fabricate plasmonic nanostructures of AuNPs with control over size and shape for various applications, such as plasmonic metamaterials and plasmonic color generation. [27-29] However, methods based on EBL are commonly costly and have low-throughput problem due to the use of expensive equipment and the single-spot scanning manner. Similar problems exist in pulsed or continuous-wave laser-based direct writing methods. [30,31] Deposition methods such as electrodeposition, [32] sputtering, [33] and evaporation/ heat treatment [34] can be used to rapidly prepare plasmonic substrates of AuNPs, but these methods lack the ability to pattern the AuNPs at the microscale and thus require a further lithography process to achieve micropatterning of AuNPs. Therefore, direct and rapid fabrication of micrometer-scale patterns of size-controlled or size-varying AuNPs remains as a challenge to unlocking the great potential of AuNPs for miniature plasmonic substrates and device applications. Recently, we developed a precision photoreduction technology for fabrication of silver-nanoparticle micropatterns and Although the extraordinary optical property of gold nanoparticles (AuNPs) has been known for a long time, the anticipated applications of AuNPs in plasmonically enhanced substrates and photonic microdevices are still under development. In this paper, a method for the direct printing of micrometerscale patterns of size-controlled AuNPs is presented for plasmonic substrates and microsensor development. Using in-house digital ultraviolet lithography, a precision photoreduction technology is developed for light-controlled growth of AuNPs to create micrometer-scale micropatterns on a titanium dioxide photo catalytic layer. T...

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Photochemically-assisted synthesis of non-toxic and biocompatible gold nanoparticles

Cited by 37 publications

References 26 publications

Photochemical Synthesis of Gold and Silver Nanoparticles—A Review

Photochemical Synthesis of Gold and Silver Nanoparticles—A Review

Original photochemical synthesis of Ag nanoparticles mediated by potato starch

Direct Printing of Micropatterned Plasmonic Substrates of Size‐Controlled Gold Nanoparticles by Precision Photoreduction

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