Measurement of the Optical Properties of Gold Colloids by Photoacoustic Spectroscopy

Gold nanoparticles (AuNPs) are useful nanomaterials as transducers for colorimetric sensors because of their high extinction coefficient and ability to change color depending on aggregation status. Therefore, over the past few decades, AuNP-based colorimetric sensors have been widely applied in several environmental and biological applications, including the detection of water pollutants. According to various studies, water pollutants are classified into heavy metals or cationic metal ions, toxins, and pesticides. Notably, many researchers have been interested in AuNP that detect water pollutants with high sensitivity and selectivity, while offering no adverse environmental issues in terms of AuNP use. This review provides a representative overview of AuNP-based colorimetric sensors for detecting several water pollutants. In particular, we emphasize the advantages of AuNP as colorimetric transducers for water pollutant detection in terms of their low toxicity, high stability, facile processability, and unique optical properties. Next, we discuss the status quo and future prospects of AuNP-based colorimetric sensors for the detection of water pollutants. We believe that this review will promote research and development of AuNP as next-generation colorimetric transducers for water pollutant detection.

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Section: Advantages Of Aunps As Colorimetric Transducers For Water Po...mentioning

confidence: 99%

Gold Nanoparticles as Exquisite Colorimetric Transducers for Water Pollutant Detection

Cho

Jung

Heo

et al. 2023

ACS Appl. Mater. Interfaces

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“…The unique specific features of gold [1][2][3] are of great interest both in the field of fundamental research [4] and in various applications [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Atomistic modeling of the properties of gold in the region of phase transitions of the first order

Mazhukin

Koroleva

Demin

et al. 2022

MathMon

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The article presents the results of atomistic modeling of the equilibrium thermophysical properties of gold in a wide temperature range (T~ 0.3–3.50 kK), covering the regions of first-order phase transitions of melting and evaporation. The temperature dependences of the density, linear size of the sample, coefficient of linear expansion, enthalpy, and heat capacity are determined. The obtained dependences of the properties of gold are approximated by polynomials of low degrees. There is an acceptable agreement between the obtained characteristics of gold and the experimental data. Numerical and graphic information on the obtained properties and results of comparison with experimental data is presented.

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“…Regarding the properties of nanoparticles (NPs), in particular the optical properties depend fundamentally on the size, shape and spatial distribution of these in the sample, which can be sphere, bar, cube, triangle, between others and these characteristics are of great relevance for its correct use (Chávez-Sandoval et al, 2015;Abrica-González et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of gold nanoparticles (AuNPs) and the reducing agents in the process

Sandoval

Flores-Mendoza

Chávez-Recio

et al. 2021

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Metallic nanoparticles (NPs) are being used mainly because they have excellent physical, chemical and biological properties, intrinsic to their size, therefore there is a boom in the use of these nanoparticles in various fields and recently, due to the pandemic about coronavirus. Copper NPs began to be used for use in medical supplies such as face masks. NPs are normally obtained through inorganic synthesis, however, the methodologies used to obtain them are in general terms expensive and involve the use of hazardous chemicals, which has increased the development of sustainable and environmentally friendly alternatives, as one of the main objectives of nanotechnology. Considering that nanoparticle biosynthesis is of greatest importance since it allowed obtaining organic NPs through an environmentally friendly; quick and inexpensive. In this work, the synthesis and characterization of AuNPs of six different plant extracts that in traditional medicine are used for respiratory diseases care, were performed. These NPs can be used in different fields; even they represent a good option to be added to medical supplies. As the AuNPs obtained from chamomile extract that turned out to be spherical, 20 nm in diameter, and well dispersed, these could be applied orally, as nanocapsules that are easily eliminated from the human body, or by aerosol, as a possible treatment for the pneumonia and SARS-CoV-2, in addition later for other nosocomial diseases. And to answer the question of what or which reducing agents are involved in the process? We proposed that, for biological synthesis, malic acid may be acting as a reducing agent and the amino group as a stabilizing agent, so we performed a synthesis with malic acid and obtained stable NPs. However, we do not dismiss other metabolites enzymes and/or proteins that could be involved in the process.

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Measurement of the Optical Properties of Gold Colloids by Photoacoustic Spectroscopy

Cited by 11 publications

References 11 publications

Gold Nanoparticles as Exquisite Colorimetric Transducers for Water Pollutant Detection

Gold Nanoparticles as Exquisite Colorimetric Transducers for Water Pollutant Detection

Atomistic modeling of the properties of gold in the region of phase transitions of the first order

Biosynthesis of gold nanoparticles (AuNPs) and the reducing agents in the process

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