Relevant bibliographies by topics / Silver Nanoparticle Aggregates

Academic literature on the topic 'Silver Nanoparticle Aggregates'

Author: Grafiati
Published: 7 September 2023

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Journal articles on the topic "Silver Nanoparticle Aggregates"

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Wang, Wei, Manman Yang, Zongyuan Wang, Jinmao Yan, and Changjun Liu. "Silver nanoparticle aggregates by room temperature electron reduction: preparation and characterization." RSC Adv. 4, no. 108 (2014): 63079–84. http://dx.doi.org/10.1039/c4ra11803k.

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Bayram, Serene S., Klas Lindfors, and Amy Szuchmacher Blum. "Tunable longitudinal modes in extended silver nanoparticle assemblies." Beilstein Journal of Nanotechnology 7 (August 26, 2016): 1219–28. http://dx.doi.org/10.3762/bjnano.7.113.

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Nanostructured materials with tunable properties are of great interest for a wide range of applications. The self-assembly of simple nanoparticle building blocks could provide an inexpensive means to achieve this goal. Here, we generate extended anisotropic silver nanoparticle assemblies in solution using controlled amounts of one of three inexpensive, widely available, and environmentally benign short ditopic ligands: cysteamine, dithiothreitol and cysteine in aqueous solution. The self-assembly of our extended structures is enforced by hydrogen bonding. Varying the ligand concentration modulates the extent and density of these unprecedented anisotropic structures. Our results show a correlation between the chain nature of the assembly and the generation of spectral anisotropy. Deuterating the ligand further enhances the anisotropic signal by triggering more compact aggregates and reveals the importance of solvent interactions in assembly size and morphology. Spectral and morphological evolutions of the AgNPs assemblies are followed via UV–visible spectroscopy and transmission electron microscopy (TEM). Spectroscopic measurements are compared to calculations of the absorption spectra of randomly assembled silver chains and aggregates based on the discrete dipole approximation. The models support the experimental findings and reveal the importance of aggregate size and shape as well as particle polarizability in the plasmon coupling between nanoparticles.
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Heck, Christian, Yuya Kanehira, Janina Kneipp, and Ilko Bald. "Amorphous Carbon Generation as a Photocatalytic Reaction on DNA-Assembled Gold and Silver Nanostructures." Molecules 24, no. 12 (June 24, 2019): 2324. http://dx.doi.org/10.3390/molecules24122324.

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Background signals from in situ-formed amorphous carbon, despite not being fully understood, are known to be a common issue in few-molecule surface-enhanced Raman scattering (SERS). Here, discrete gold and silver nanoparticle aggregates assembled by DNA origami were used to study the conditions for the formation of amorphous carbon during SERS measurements. Gold and silver dimers were exposed to laser light of varied power densities and wavelengths. Amorphous carbon prevalently formed on silver aggregates and at high power densities. Time-resolved measurements enabled us to follow the formation of amorphous carbon. Silver nanolenses consisting of three differently-sized silver nanoparticles were used to follow the generation of amorphous carbon at the single-nanostructure level. This allowed observation of the many sharp peaks that constitute the broad amorphous carbon signal found in ensemble measurements. In conclusion, we highlight strategies to prevent amorphous carbon formation, especially for DNA-assembled SERS substrates.
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Chen, Shao-Feng, and Hongyin Zhang. "Stability and sedimentation of silver nanoparticles in the presence of monovalent, divalent and trivalent electrolyte solutions." Water Science and Technology 70, no. 2 (May 24, 2014): 361–66. http://dx.doi.org/10.2166/wst.2014.238.

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The present study seeks to elucidate the effect of different electrolytes on the stability of citrate-coated silver nanoparticles synthesized by the reduction of the Ag(NH3)2+ complex via Tollens’ method. Time-resolved dynamic light scattering technique was used to measure the aggregation behavior of the nanoparticles over a range of electrolyte (NaCl, CaCl2, and AlCl3) concentrations. From the aggregation kinetic data, the critical coagulation concentration values were calculated as 0.11, 1.7 × 10−3, and 5.06 × 10−6M for NaCl, CaCl2, and AlCl3, respectively. Supernatant of the nanoparticle suspension in presence of the three electrolytes was collected and measured using inductively coupled plasma mass spectrometry to quantify the sedimentation. It was found that the silver nanoparticle aggregates settled rapidly in the slow aggregation and fast aggregation regimes. Their sedimentation followed a nanoparticle size-dependent manner.
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Diehn, Sabrina, Helmut Schlaad, and Janina Kneipp. "Multivariate Imaging for Fast Evaluation of In Situ Dark Field Microscopy Hyperspectral Data." Molecules 27, no. 16 (August 12, 2022): 5146. http://dx.doi.org/10.3390/molecules27165146.

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Dark field scattering microscopy can create large hyperspectral data sets that contain a wealth of information on the properties and the molecular environment of noble metal nanoparticles. For a quick screening of samples of microscopic dimensions that contain many different types of plasmonic nanostructures, we propose a multivariate analysis of data sets of thousands to several hundreds of thousands of scattering spectra. By using non-negative matrix factorization for decomposing the spectra, components are identified that represent individual plasmon resonances and relative contributions of these resonances to particular microscopic focal volumes in the mapping data sets. Using data from silver and gold nanoparticles in the presence of different molecules, including gold nanoparticle-protein agglomerates or silver nanoparticles forming aggregates in the presence of acrylamide, plasmonic properties are observed that differ from those of the original nanoparticles. For the case of acrylamide, we show that the plasmon resonances of the silver nanoparticles are ideally suited to support surface enhanced Raman scattering (SERS) and the two-photon excited process of surface enhanced hyper Raman scattering (SEHRS). Both vibrational tools give complementary information on the in situ formed polyacrylamide and the molecular composition at the nanoparticle surface.
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Quadrini, Fabrizio, Denise Bellisario, Loredana Santo, and Giovanni Matteo Tedde. "Anti-Bacterial Nanocomposites by Silver Nano-Coating Fragmentation." Materials Science Forum 879 (November 2016): 1540–45. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1540.

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Silver nanocomposites are of great interest for several fields, ranging from packaging to biomedical applications, because of their known antibacterial properties. However, their use is strongly limited by technological issues: synthesis methods of silver nanoparticles are still difficult to control in terms of size, shape and aggregation. Moreover separation of nanoparticle aggregates should occur during part manufacturing by mixing with the polymer base but this process is also troublesome. In the present study, a new process to fabricate silver nanocomposites with antibacterial properties is presented. Silver nanofilms are deposited by radio frequency (RF) sputtering on polypropylene (PP) substrates. Consequently PP coated substrates are cut and inserted in a small-scale polymer mixer to produce the nanocomposite in a single step, without the need of producing nanoparticles. In fact, nanoparticles originate by the fragmentation of the nanocoating. Microscopic observations of nanocomposites revealed silver nanoclusters of different sizes. Their antibacterial activity has been verified in accordance to ISO 22196. The antibacterial activity of the nanocomposite was detected for the Escherichia coli and Staphylococcus aureus bacteria.
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Murthy, Jsr, Venkata Kumar T, and Narayana Rao V. "COUROUPITA GUIANENSIS LEAF CALLUS EXTRACT MEDIATED SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF SILVER NANOPARTICLES." Asian Journal of Pharmaceutical and Clinical Research 10, no. 5 (May 1, 2017): 126. http://dx.doi.org/10.22159/ajpcr.2017.v10i5.17066.

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Objective: Synthesis of varied sized and morphologically distinct silver nanoparticles (AgNPs) using callus/callus extract, and their promising antibacterial and cytotoxicity was reported from very few plant systems. Here, we investigated silver nanoparticle synthetic potential of Couroupita guianensis leaf callus extract and their antibacterial activity.Methods: synthesis of callus mediated silver nanoparticles and characterisation of physical, chemical, and antibacterial activity of AgNPs.Results: Callus extract rapidly reduced silver ions and stabilized nanoparticles have displayed characteristic maximum UV absorbance at 410 nm. SEM and AFM images revealed their spherical morphology and size variation, which is ranged from 30.38 nm to 88.32 nm and were in small aggregates. Capping of AgNPs by the phenolic compounds and proteins revealed from FTIR spectral peaks. Silver nanoparticles displayed significantly high antimicrobial activity against both Gram positive and negative bacterial strains compared to silver ions and gentamicin. This enhanced antimicrobial activity of AgNPs may due their small size leading to efficient molecular contact with cell surface, and uptake and interaction with vital biomolecules.Conclusions: Stable AgNPs were synthesized through reduction and capping of silver ions by polyphenols and proteins present in callus extract. Theenhanced antimicrobial activity of AgNPs may due to their small size leading to efficient molecular contact with the cell surface, penetration, andinteraction, and inactivation of vital biomolecules.KEY WORDS: Couroupita guianensis, callus extract, Silver nanoparticles (AgNPs), antibacterial activity
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Kim, Hyunmin, Eunjoo Kim, Eunsook Choi, Chul Su Baek, Bokyung Song, Chang-Hee Cho, and Sang Won Jeong. "Label-free C-reactive protein SERS detection with silver nanoparticle aggregates." RSC Advances 5, no. 44 (2015): 34720–29. http://dx.doi.org/10.1039/c5ra00040h.

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Gill, Ron, Lijin Tian, Walter R. C. Somerville, Eric C. Le Ru, Herbert van Amerongen, and Vinod Subramaniam. "Silver Nanoparticle Aggregates as Highly Efficient Plasmonic Antennas for Fluorescence Enhancement." Journal of Physical Chemistry C 116, no. 31 (August 2012): 16687–93. http://dx.doi.org/10.1021/jp305720q.

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Gill, Ron, Lijin Tian, Herbert van Amerongen, and Vinod Subramaniam. "Emission enhancement and lifetime modification of phosphorescence on silver nanoparticle aggregates." Physical Chemistry Chemical Physics 15, no. 38 (2013): 15734. http://dx.doi.org/10.1039/c3cp50407g.

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Dissertations / Theses on the topic "Silver Nanoparticle Aggregates"

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Yuksel, Recep. "Sensitive And Quantitative Determination Of Cysteine By Surface Enhanced Raman Spectrometry Based On Their Induced Aggregates Of Gold And Silver Nanostructures." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613632/index.pdf.

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ABSTRACT SENSITIVE AND QUANTITATIVE DETERMINATION OF CYSTEINE BY SURFACE ENHANCED RAMAN SPECTROMETRY BASED ON THEIR INDUCED AGGREGATES OF GOLD AND SILVER NANOSTRUCTURES Yü
ksel, Recep M.Sc., Department of Chemistry Supervisor: Prof. Dr. Mü
rvet Volkan September 2011, 76 pages The synthesis of noble metal nanostructures are an active research area and controlling the shape and the size is a challenging task. In this study, nanostructures with different morphologies were prepared using wet chemical synthesis techniques in the aqueous solutions. Gold and silver nanospheres were produced by reducing and capping agent trisodium citrate. Gold nanorods were synthesized by chemical reduction of HAuCl4 by ascorbic acid in the presence of cetyltrimethylammonium bromide (CTAB), AgNO3, and gold nanoseeds (in 1.5 nm diameter) and gold silver core shell nanorods were prepared by addition of silver atoms on the surface of gold nanorods in the presence of CTAB. Parameters that were critical to obtain homogeneous nanostructures were optimized. The characterization of the nanoparticles was performed by UV-VIS spectrometry, High Resolution - Transition Electron Microscopy (HR-TEM), Field Emission - Scanning Electron Microscopy (FE-SEM) and Energy Dispersive X-ray Spectroscopy (EDX). Besides, their electromagnetic enhancement properties were demonstrated through SERS measurement of cysteine. Self-assembly or assisted assembly of nanorods or nanospheres into organized arrays allows the realization of their collective properties that arise from the coupling of the optical and electronic properties of the neighbouring individual nanoparticles. In this study cysteine molecule was used as a linker molecule. The controlled addition of cysteine into the gold nanorod solution resulted in their preferential binding to the two ends of the gold nanorods and the formation of gold nanochains. In the usage of gold nanospheres on the other hand, cooperative hydrogen bonding of the cysteine molecules, resulted in the formation of gold nanoclusters. The assembly formation was demonstrated by UV&ndash
vis spectrometry and FE-SEM. Cysteine is a thiol group containing amino acid and deficiency of cysteine results in serious health problems. Therefore, determination of cysteine is an important issue. Herein we report two strategies for the quantitative determination of micromolar concentrations of cysteine by exploiting the interplasmon coupling in Au nanoparticles. One of them is a recently published colorimetric method and the other is a novel SERS method.
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Books on the topic "Silver Nanoparticle Aggregates"

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Photographic Science: Advances in Nanoparticles, J-aggregates, Dye Sensitization, and Organic Devices. Oxford: Oxford University Press, 2011.

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Book chapters on the topic "Silver Nanoparticle Aggregates"

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Li, Yang, Yunpeng Wang, Jinwei Tian, and Jian-An Huang. "Detection of Cell-Derived Exosomes Via Surface-Enhanced Raman Scattering Using Aggregated Silver Nanoparticles." In Methods in Molecular Biology, 15–22. New York, NY: Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-3203-1_2.

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Tani, Tadaaki. "Preparation and Performance of Silver Nanoparticles." In Photographic ScienceAdvances in Nanoparticles, J-Aggregates, Dye Sensitization, and Organic Devices, 210–32. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199572953.003.0008.

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Tani, Tadaaki. "Physical Properties of Silver Halides." In Photographic ScienceAdvances in Nanoparticles, J-Aggregates, Dye Sensitization, and Organic Devices, 46–88. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199572953.003.0003.

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Tani, Tadaaki. "Structure and Preparation of Silver Halide Grains." In Photographic ScienceAdvances in Nanoparticles, J-Aggregates, Dye Sensitization, and Organic Devices, 15–45. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199572953.003.0002.

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Tani, Tadaaki. "Silver Halide Nanocrystals and Nuclear Particle Detectors." In Photographic ScienceAdvances in Nanoparticles, J-Aggregates, Dye Sensitization, and Organic Devices, 194–209. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199572953.003.0007.

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Guzmán, Katherine, Brajesh Kumar, Marcelo Grijalva, Alexis Debut, and Luis Cumbal. "Ascorbic Acid-assisted Green Synthesis of Silver Nanoparticles: pH and Stability Study." In Green Chemistry - New Perspectives [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107202.

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In this chapter, eco-friendly in situ synthesis of silver nanoparticles (AgNPs) using a mixture of ascorbic acid and citric acid is introduced. The synthesis conditions of the AgNPs were optimized by adjusting the pH of the reaction mixture. Different spectroscopic and microscopic techniques have been used to characterize the physico-chemical properties of AgNPs. The synthesis of AgNPs was primarily identified by the appearance of yellow colour and confirmed by showing λmax = 409 nm in UV-visible spectroscopy. All characterization techniques reveal that the generated AgNPs were non-aggregated, quasi-spherical shapes with an average size of 22.4 ± 13.2 nm, and face-centred cubic crystalline structures. Infrared spectroscopy confirms the surface of AgNPs covered with -COOH group and shows peaks at 1733, 1759, 3262 and 3633 cm−1. Moreover, synthesized AgNPs at pH 10 were stable for one month with a slight change in size. A straightforward, facile and environmentally-friendly synthesis of highly stable AgNPs may contribute to future engineering applications.
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Conference papers on the topic "Silver Nanoparticle Aggregates"

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Smejkal, Petr, Blanka Vlckova, Ioana Pavel, Martin Moskovits, Magdalena Sladkova, Karolina Siskova, and Miroslav Slouf. "Nanocomposites With Strong Optical Resonances: Silver Nanoparticles-Organic Molecules Systems." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47029.

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The ability of selected molecular species to link Ag nanoparticles into dimers and/or small aggregates has been tested. Dimercaptocarborane and ethidium bromide have been shown to link Ag nanoparticles via their bonding to Ag nanoparticle surface probably by the two strongly argentophilic groups in para-positions. Alternatively, dimers and small aggregates were assembled through an electrostatic interaction between negatively charged citrate-modified and positively charged polylysine-modified Ag nanoparticles, and a subsequent incorporation of 5, 10, 15, 20-tetrakis(4-sulphonato-phenyl)porphine (TSPP) into such preprepared nanoobjects has been probed by SERRS (surface-enhanced resonance Raman scattering). Formation of dimers and small aggregates has been established by TEM (transmission electron microscopy) and SEM (scanning electron microscopy). SE(R)RS spectral measurements from specific locations of samples containing molecularly-linked dimers and aggregates have shown temporal fluctuations (blinking) of the SE(R)RS signal, which indicates, that the signal likely originates from molecules located in the strong, nanoscale localized optical fields dubbed hot spots. In addition to that, characteristic bands of graphitic carbon were observed in the spectra and their intensities (together with the spectral background intensities) strongly varied with time and from one spectrum to another. One of the possible explanations of these observations is a photochemical and/or thermal decomposition of the molecules located in hot spots combined with diffusion of unperturbed molecules into hot spots.
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Mehigan, Sam, and Eithne McCabe. "A consideration of silver nanoparticle aggregates with a view to SERS." In SPIE Photonics Europe, edited by David L. Andrews, Jean-Michel Nunzi, and Andreas Ostendorf. SPIE, 2014. http://dx.doi.org/10.1117/12.2059866.

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Kim, Joon Heon, Jung Su Park, and Min-Gon Kim. "Strong hyper-Rayleigh scattering from silver nanoparticle aggregates to be used for the optical bio-sensing assay." In Nano-Bio Sensing, Imaging and Spectroscopy, edited by Shin Won Kang, Seung-Han Park, Luke P. Lee, Ki-Bong Song, and Yo Han Choi. SPIE, 2013. http://dx.doi.org/10.1117/12.2018703.

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Ma, Qianli, and Haisheng Fang. "Viscosity Prediction of Water-Based Silver Nanofluid Using Equilibrium Molecular Dynamics." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65831.

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Nanofluids containing silver (Ag) nanoparticles have been used in three dimensional ink-jet printing (3DP) in recent years. Rheological properties of the nanofluids, for example, viscosity, play significant roles during the application. In this paper, viscosity of Ag-water nanofluid has been predicted using the equilibrium molecular dynamics method. The influencing factors of the viscosity, including temperature, nanoparticle size, nanoparticle concentration and nanoparticle aggregation, have been investigated. By screening the existing water models, TIP4P/2005 model is found the most suitable for viscosity calculation under the temperature range. The weight fraction of the nanoparticles, which proves more appropriate, is used during the study of the concentration effect instead of volume fraction. The results show that the viscosity of the nanofluid goes up by decreasing temperature or increasing nanoparticle concentration. Furthermore, as the nanoparticles get smaller, or aggregate, the viscosity increases slightly.
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Zuojun Zhang, Li Chen, Gang Chen, Chunhong Lai, and Hui Zhou. "Silver nanoparticles aggregate on passivated copper foil for Surface-enhanced Raman scattering." In 2013 8th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2013. http://dx.doi.org/10.1109/nems.2013.6559780.

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Melnikau, D., D. Savateeva, Y. K. Gun'ko, and Y. P. Rakovich. "Enhanced chiroptical properties of a hybrid material consisting of J-aggregates and silver nanoparticles." In 2014 16th International Conference on Transparent Optical Networks (ICTON). IEEE, 2014. http://dx.doi.org/10.1109/icton.2014.6876652.

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Starovoytov, A. A., R. D. Nabiullina, and I. A. Gladskikh. "Features of Optical Properties of Organometallic Films of Pseudoisocyanine J-aggregates and Inhomogeneous Ensembles of Silver Nanoparticles." In 2018 International Conference Laser Optics (ICLO). IEEE, 2018. http://dx.doi.org/10.1109/lo.2018.8435544.

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Polischuk, Vladimir A., Anton A. Starovoytov, Rezida D. Nabiullina, Igor A. Gladskih, Peter S. Parfenov, and Aisylu N. Kamalieva. "Plasmon-exciton interaction in the thin film of inhomogeneous ensemble of silver nanoparticles and cyanine J-aggregates." In Nanophotonics, edited by David L. Andrews, Jean-Michel Nunzi, Andreas Ostendorf, and Angus J. Bain. SPIE, 2018. http://dx.doi.org/10.1117/12.2307246.

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Arif, Moh Syaiful, Erika Risdayana, Ika Yekti Liana Sari, and Aman Sentosa Panggabean. "Synthesis of silver nanoparticles (AgNPs) using aggregate mangrove leaf extract (Sonneratia alba) for colorimetric analysis of chloramphenicol." In THE 3RD INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCES (THE 3RD ICMSc): A Brighter Future with Tropical Innovation in the Application of Industry 4.0. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0112721.

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