Green synthesis of gold nanoparticles under sunlight irradiation and their colorimetric detection of Ni<sup>2+</sup> and Co<sup>2+</sup> ions

Annadhasan, Mari; Kasthuri, Jayapalan; Rajendiran, Nagappan

doi:10.1039/c4ra14034f

Cited by 75 publications

(41 citation statements)

References 61 publications

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“…Other commonly employed physical synthesis methods include sonochemical, microwave, and photochemical based methods (Herizchi et al, 2016). A recently developed technique utilizes N-cholyl-L-valine (NaValC) as a self-reducing and stabilizing agent intended to be coupled with natural sunlight irradiation for the synthesis of GNPs (Annadhasan et al, 2015). By modifying the ratio of Au 3+ to NaValC ions, the amount of sunlight irradiation, pH, and the reaction time, the size and shape of synthesized GNPs can be changed.…”

Section: Gold Nanoparticle Synthesismentioning

confidence: 99%

Gold Nanoparticles for Photothermal Cancer Therapy

Vines¹,

et al. 2019

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Gold is a multifunctional material that has been utilized in medicinal applications for centuries because it has been recognized for its bacteriostatic, anticorrosive, and antioxidative properties. Modern medicine makes routine, conventional use of gold and has even developed more advanced applications by taking advantage of its ability to be manufactured at the nanoscale and functionalized because of the presence of thiol and amine groups, allowing for the conjugation of various functional groups such as targeted antibodies or drug products. It has been shown that colloidal gold exhibits localized plasmon surface resonance (LPSR), meaning that gold nanoparticles can absorb light at specific wavelengths, resulting in photoacoustic and photothermal properties, making them potentially useful for hyperthermic cancer treatments and medical imaging applications. Modifying gold nanoparticle shape and size can change their LPSR photochemical activities, thereby also altering their photothermal and photoacoustic properties, allowing for the utilization of different wavelengths of light, such as light in the near-infrared spectrum. By manufacturing gold in a nanoscale format, it is possible to passively distribute the material through the body, where it can localize in tumors (which are characterized by leaky blood vessels) and be safely excreted through the urinary system. In this paper, we give a quick review of the structure, applications, recent advancements, and potential future directions for the utilization of gold nanoparticles in cancer therapeutics.

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Section: Gold Nanoparticle Synthesismentioning

confidence: 99%

Gold Nanoparticles for Photothermal Cancer Therapy

Vines¹,

et al. 2019

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“…The deconvoluted peaks of O 1 s appeared at 533.6, 532.3, and 530.9 eV for Am-SQD-Per, and 533.4, 532.1, 530.9 eV for Urea-SQD-Per. These can be assigned to C-O, Si-O, and amidic or imidic carbonyl (-N-C=O), respectively 29 – 31 . The C 1 s binding energy peaks were present at 288.4, 286.4, and 285 eV for Am-SQD-Per, and 288.7, 286.3, and 284.8 eV for Urea-SQD-Per.…”

Section: Resultsmentioning

confidence: 99%

Energy/Electron Transfer Switch for Controlling Optical Properties of Silicon Quantum Dots

Abdelhameed

Aly

Lant

et al. 2018

Sci Rep

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The superior optical properties of Silicon Quantum Dots (SQDs) have made them of increasing interest for a variety of biological and opto-electronic applications. The surface functionalization of the SQDs with aromatic ligands plays a key role in controlling their optical properties due to the interaction of the ligands with the electronic wave function of SQDs. However, there is limited reports in literature describing the impact of spacer groups connecting the aromatic chromophore to SQDs on the optical properties of the SQDs. Herein, we report the synthesis of two SQDs assemblies (1.6 nm average diameter) functionalized with perylene-3,4,9,10-tetracarboxylic acid diimide (PDI) chromophore through N-propylurea and propylamine spacers. Depending on the nature of the spacer, the photophysical measurements provide clear evidence for efficient energy and/or electron transfer between the SQDs and PDI. Energy transfer was confirmed to be the operative process when propylurea spacer was used, in which the rate was estimated to be ~2 × 109 s−1. On the other hand, the propylamine spacer was found to facilitate electron transfer process within the SQDs assembly. To illustrate functionality, the water soluble SQD-N-propylurea-PDI assembly was proven to be nontoxic and efficient for fluorescent imaging of embryonic kidney HEK293 cells and human bone cancerous U2OS cells.

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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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Green synthesis of gold nanoparticles under sunlight irradiation and their colorimetric detection of Ni²⁺ and Co²⁺ ions

Abstract: A novel, green, one-pot and energy efficient route has been developed for the synthesis of gold nanoparticles by natural sunlight irradiation, and they were utilized effectively for the colorimetric detection of Ni2+ and Co2+ ions.

Cited by 75 publications

References 61 publications

Gold Nanoparticles for Photothermal Cancer Therapy

Gold Nanoparticles for Photothermal Cancer Therapy

Energy/Electron Transfer Switch for Controlling Optical Properties of Silicon Quantum Dots

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

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Green synthesis of gold nanoparticles under sunlight irradiation and their colorimetric detection of Ni2+ and Co2+ ions

Abstract: A novel, green, one-pot and energy efficient route has been developed for the synthesis of gold nanoparticles by natural sunlight irradiation, and they were utilized effectively for the colorimetric detection of Ni2+ and Co2+ ions.

Cited by 75 publications

References 61 publications

Gold Nanoparticles for Photothermal Cancer Therapy

Gold Nanoparticles for Photothermal Cancer Therapy

Energy/Electron Transfer Switch for Controlling Optical Properties of Silicon Quantum Dots

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

Contact Info

Product

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Green synthesis of gold nanoparticles under sunlight irradiation and their colorimetric detection of Ni²⁺ and Co²⁺ ions