Diffraction patterns and nonlinear optical properties of gold nanoparticles

Ara, M.H. Majles; Dehghani, Z.; Sahraei, Reza; Daneshfar, Ali; Javadi, Z.; Divsar, Faten

doi:10.1016/j.jqsrt.2011.12.006

Cited by 68 publications

(10 citation statements)

References 42 publications

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“…Results at open aperture show presence of nonlinear absorption, Fig. 3(a) shows the photograph spot at 25 mW and Fig 3(b) shows the horizontal profile where the presence of one ring originated by self-diffraction can be seen, the value of nonlinear absorption for AuLa is β=3.5x10 -5 cm/W (see figure 3 (c)) is very low compared with another values [9]. The results at close aperture were divided by the open aperture results and were normalized.…”

Section: Resultsmentioning

confidence: 92%

Determination of refraction nonlinear index, for effect thermal, of solutions with nanoparticles of gold

et al. 2013

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Research of nonlinear optical properties of materials for manufacturing opto-electronic devices, had a great growth in the last years. The solutions with nanoparticle metals present nonlinear optical properties. In this work we present the results of characterizing, analyzing and determining the magnitude and sign of the nonlinear refractive index, using the z-scan technique in solutions with nanoparticles of gold, lipoic acid and sodium chloride. We used a continuous Argon laser at 514 nm with variable power, an 18 cms lens, and a chopper. We determined the nonlinear refractive index in the order of 10 -9 . These materials have potential applications mainly as optical limiters.

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Section: Resultsmentioning

confidence: 92%

Determination of refraction nonlinear index, for effect thermal, of solutions with nanoparticles of gold

et al. 2013

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“…B, ‐GSS as an example) show crystallinity. These peaks were assigned to the 111, 200, 220, 311 and 222 planes, respectively, corresponding to the face centered‐cubic structures of metallic gold . The broad peak at 2 θ = 10° to 22° for GSS (Fig.…”

Section: Resultsmentioning

confidence: 97%

Improved Photophysical and Photochemical Properties of Thiopheneethoxy Substituted Metallophthalocyanines on Immobilization onto Gold‐speckled Silica Nanoparticles

Dube

Oluwole

Nyokong

2018

Photochem & Photobiology

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This work reports on the synthesis of tetrakis-[(thiophineethoxy) phthalocyaninato] indium(II) chloride (3). The photophysical behavior of complex 3 was compared to that of the Zn derivative (tetrakis-[(thiophineethoxy) phthalocyaninato] zinc(II) (complex 2)). The compounds were interacted with gold-speckled silica (GSS) nanoparticles via Au-S self assembly to afford the conjugates (2-GSS and 3-GSS). The photophysicochemical behavior of the compounds and their conjugates were assessed. The conjugates afforded a decrease in fluorescence quantum yields and lifetimes with improved triplet and singlet oxygen quantum yields in comparison with complexes 2 and 3 alone. The complexes and their conjugates could serve as good candidates for photodynamic therapy.

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“…The report revealed second-order nonlinear optical (NLO) properties studied using continuous wave (CW) He-Ne laser beam technique at wavelength 632.8 nm. The non-linear refractive indices of AuNPs are obtained from a z-scan in the order of 10 −7 cm 2 /W [61]. Researchers have reviewed various aspects of size-dependent SPR of AuNPs.…”

Section: Optical Propertiesmentioning

confidence: 99%

Green Synthesis of Gold Nanoparticles Using Plant Extracts as Beneficial Prospect for Cancer Theranostics

Bharadwaj

Rabha

Pati³

et al. 2021

Molecules

105

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Gold nanoparticles (AuNPs) have been widely explored and are well-known for their medical applications. Chemical and physical synthesis methods are a way to make AuNPs. In any case, the hunt for other more ecologically friendly and cost-effective large-scale technologies, such as environmentally friendly biological processes known as green synthesis, has been gaining interest by worldwide researchers. The international focus on green nanotechnology research has resulted in various nanomaterials being used in environmentally and physiologically acceptable applications. Several advantages over conventional physical and chemical synthesis (simple, one-step approach to synthesize, cost-effectiveness, energy efficiency, and biocompatibility) have drawn scientists’ attention to exploring the green synthesis of AuNPs by exploiting plants’ secondary metabolites. Biogenic approaches, mainly the plant-based synthesis of metal nanoparticles, have been chosen as the ideal strategy due to their environmental and in vivo safety, as well as their ease of synthesis. In this review, we reviewed the use of green synthesized AuNPs in the treatment of cancer by utilizing phytochemicals found in plant extracts. This article reviews plant-based methods for producing AuNPs, characterization methods of synthesized AuNPs, and discusses their physiochemical properties. This study also discusses recent breakthroughs and achievements in using green synthesized AuNPs in cancer treatment and different mechanisms of action, such as reactive oxygen species (ROS), mediated mitochondrial dysfunction and caspase activation, leading to apoptosis, etc., for their anticancer and cytotoxic effects. Understanding the mechanisms underlying AuNPs therapeutic efficacy will aid in developing personalized medicines and treatments for cancer as a potential cancer therapeutic strategy.

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Diffraction patterns and nonlinear optical properties of gold nanoparticles

Cited by 68 publications

References 42 publications

Determination of refraction nonlinear index, for effect thermal, of solutions with nanoparticles of gold

Determination of refraction nonlinear index, for effect thermal, of solutions with nanoparticles of gold

Improved Photophysical and Photochemical Properties of Thiopheneethoxy Substituted Metallophthalocyanines on Immobilization onto Gold‐speckled Silica Nanoparticles

Green Synthesis of Gold Nanoparticles Using Plant Extracts as Beneficial Prospect for Cancer Theranostics

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