Physical Properties and the Reconstruction of Unstable Decahedral Silver Nanoparticles Synthesized Using Plasmon-Mediated Photochemical Process

Chen, Jui‐Chang; Chu, Yu-Te; Chang, Shi-Hise; Chuang, Ya-Tin; Huang, Cheng‐Liang

doi:10.3390/nano12071062

Cited by 4 publications

(5 citation statements)

References 51 publications

(77 reference statements)

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“…Then the photochemical seed AgNP colloids were irradiated with blue LEDs (460 ± 12 nm, 40 mW/cm 2 , as shown in Figure 1B) for 90 min. The end products exhibited a fascinating bicolor characteristic, reflecting shades of orange and green when viewed from various angles [28], as illustrated in Figure 2. This intriguing optical property is attributed to the intense light scattering by the product's unique structure [29,30].…”

Section: Preparation Of D-agnp Colloids Using the Photochemical Methodsmentioning

confidence: 99%

Fluorescence Evolution of Gold Nanoclusters in the Presence of Shapely Silver Nanoparticles and UV-Vis Light

et al. 2023

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Gold nanoclusters (Au NCs) belong to a class of materials that is highly fluorescent and biocompatible. Bovine serum albumin (BSA) protected gold nanoclusters (BSA-Au NCs) have been extensively used in biological applications due to their easy synthesis and relatively high quantum yield. Therefore, understanding the behavior of BSA-Au NCs in different chemical and physical environments is essential to enhance their application in biological systems. In this study, we investigated the effect of plasmonic nanostructures with different localized surface plasmon resonance (LSPR) wavelengths on the behavior of BSA-Au NCs by recording time-dependent fluorescence spectra in the presence of silver nanoparticles (AgNPs) with various shapes. However, we did not observe any conclusive LSPR-wavelength-dependent fluorescent behavior. Additionally, the fluorescence intensity of BSA-Au NCs exhibited gradual decay under light excitation, even at several hundred μW/cm2 in a fluorescence spectrometer, indicating that they are not as photostable as previously assumed. We found further that the photostability of BSA-Au NCs is affected by the wavelength of the incident light (370, 420, 480, and 550 nm), which can be accurately described using bi-exponential decay functions. Our study provides an easy in situ method to evaluate the photostability of Au NCs under different-wavelength light irradiation using a commercial fluorescence spectrometer.

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Section: Preparation Of D-agnp Colloids Using the Photochemical Methodsmentioning

confidence: 99%

Fluorescence Evolution of Gold Nanoclusters in the Presence of Shapely Silver Nanoparticles and UV-Vis Light

et al. 2023

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“…For instance, after Kneipp first used colloidal silver nanoparticle solution to detect a single R6G molecule in 1997 [ 101 ], subsequent studies have demonstrated the achievement of single-molecule detection using nanometal colloids. As a result, ongoing efforts focus on the development of metal nanoparticles, including different shapes of MNPs [ 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 ], composite materials of MNPs [ 111 , 112 , 113 , 114 , 115 ], and the modified MNPs [ 116 , 117 , 118 ].…”

Section: Design Fabrication and Applications Of Sersmentioning

confidence: 99%

“…Currently, various shapes of metal MNPs have been proposed, including the nanorods [ 111 , 116 ], nanostars [ 109 ], nanocubes [ 110 ], hyperbranched Au nanocorals [ 102 ], flower-like Au NPs [ 103 ], Pt-Au triangular nanoprisms [ 104 ], Au popcorns [ 105 ], decahedral Ag NPs [ 106 ], Au nanofoams [ 107 ], and dual-gap Au nanodumbbells [ 108 ]. These different shapes are aimed at creating more branches, pores, or tips on the MNPs, which are believed to generate high-intensity electromagnetic regions, also known as anisotropic hot spots.…”

Section: Design Fabrication and Applications Of Sersmentioning

confidence: 99%

Design, Fabrication, and Applications of SERS Substrates for Food Safety Detection: Review

Lin

et al. 2023

Micromachines

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Sustainable and safe food is an important issue worldwide, and it depends on cost-effective analysis tools with good sensitivity and reality. However, traditional standard chemical methods of food safety detection, such as high-performance liquid chromatography (HPLC), gas chromatography (GC), and tandem mass spectrometry (MS), have the disadvantages of high cost and long testing time. Those disadvantages have prevented people from obtaining sufficient risk information to confirm the safety of their products. In addition, food safety testing, such as the bioassay method, often results in false positives or false negatives due to little rigor preprocessing of samples. So far, food safety analysis currently relies on the enzyme-linked immunosorbent assay (ELISA), polymerase chain reaction (PCR), HPLC, GC, UV-visible spectrophotometry, and MS, all of which require significant time to train qualified food safety testing laboratory operators. These factors have hindered the development of rapid food safety monitoring systems, especially in remote areas or areas with a relative lack of testing resources. Surface-enhanced Raman spectroscopy (SERS) has emerged as one of the tools of choice for food safety testing that can overcome these dilemmas over the past decades. SERS offers advantages over chromatographic mass spectrometry analysis due to its portability, non-destructive nature, and lower cost implications. However, as it currently stands, Raman spectroscopy is a supplemental tool in chemical analysis, reinforcing and enhancing the completeness and coverage of the food safety analysis system. SERS combines portability with non-destructive and cheaper detection costs to gain an advantage over chromatographic mass spectrometry analysis. SERS has encountered many challenges in moving toward regulatory applications in food safety, such as quantitative accuracy, poor reproducibility, and instability of large molecule detection. As a result, the reality of SERS, as a screening tool for regulatory announcements worldwide, is still uncommon. In this review article, we have compiled the current designs and fabrications of SERS substrates for food safety detection to unify all the requirements and the opportunities to overcome these challenges. This review is expected to improve the interest in the sensing field of SERS and facilitate the SERS applications in food safety detection in the future.

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“…Solar energy conversion, catalysis, water treatment, antimicrobial activity, lithography and photocatalysis are studied by researchers to utilize functional features of AgNPs [15][16][17]. Some different approaches such as photochemical and electrochemical procedures, radiation, and Langmuir-Blodgett are currently widely used to synthesize AgNPs [18][19][20][21][22]. In the last two decades, the biological methods using microorganisms or plant extracts have been significantly considered.…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of silver nanoparticles using Poa bulbosa extract and their antibacterial activity

Allafchian

Jalali

Zare

et al. 2022

Micro & Nano Letters

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Plant tissues are regarded as rich sources of phytochemicals that can be used in the fabrication of nanometals. In this work, silver nanoparticles (AgNPs) are fabricated using an aqueous Poa bulbosa extract as an efficient reducing agent. The plasmon resonance peaks of the AgNPs recorded by UV–visible spectra during 25 min of the extract exposure to silver ions indicate a blue shift with the chemical reduction process. The FT‐IR spectrum of the Poa bulbosa extract shows the presence of chemical bonds of biomolecules that are involved in the reduction of Ag+ ions to AgNPs. The crystallite and particle sizes of AgNPs are estimated as 45.04 ± 13.6, 56.98 ± 13.08 and 43.14 ± 16.06 nm by XRD, SEM and TEM, respectively. DLS measurements showed a mean particle size of 119.26 ± 26.2 nm and zeta potential of −69.53 mV for the AgNPs indicating a proper colloidal stability. The most pronounced inhibition zone of antibacterial activity is found to be against Salmonella typhimurium, which is mainly attributed to the cell wall structure of the Gram‐negative strains. This is also demonstrated in the minimum inhibitory concentration (MIC) of 1.6 μg/mL in case of S. typhimurium.

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Physical Properties and the Reconstruction of Unstable Decahedral Silver Nanoparticles Synthesized Using Plasmon-Mediated Photochemical Process

Cited by 4 publications

References 51 publications

Fluorescence Evolution of Gold Nanoclusters in the Presence of Shapely Silver Nanoparticles and UV-Vis Light

Fluorescence Evolution of Gold Nanoclusters in the Presence of Shapely Silver Nanoparticles and UV-Vis Light

Design, Fabrication, and Applications of SERS Substrates for Food Safety Detection: Review

Biosynthesis of silver nanoparticles using Poa bulbosa extract and their antibacterial activity

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