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Journal articles on the topic 'Ag nanostar'

Author: Grafiati

Published: 1 April 2023

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1

Petriev, Iliya, Polina Pushankina, Ivan Lutsenko, Nikita Shostak, and Mikhail Baryshev. "Synthesis, Electrocatalytic and Gas Transport Characteristics of Pentagonally Structured Star-Shaped Nanocrystallites of Pd-Ag." Nanomaterials 10, no. 10 (October 21, 2020): 2081. http://dx.doi.org/10.3390/nano10102081.

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The method of synthesis of bimetallic Pd–Ag pentagonally structured catalyst “nanostar” on the surface of Pd-23%Ag alloy films has been developed. The resulting catalyst was studied as a highly active functional layer for methanol oxidation reaction (MOR) in alkaline media and the intensification of hydrogen transport through the Pd-23%Ag membrane in the processes of hydrogen diffusion purification. A modifying layer with a controlled size, composition and excellent electrocatalytic activity was synthesized by electrochemical deposition at a reduced current density compared to classical methods. The low deposition rate affects the formation of pentagonally structured nanocrystallites, allowing Pd and Ag particles to form well-defined structures due to the properties of the surfactant used. Electrochemical studies have demonstrated that the catalyst synthesized by the “nanostar” method shows better electrocatalytic activity in relation to MOR and demonstrates a higher peak current (up to 17.82 µA cm−2) in comparison with one for the catalyst synthesized by the “nanoparticle” method (up to 10.66 µA cm−2) in a cyclic voltammetric study. The nanostar catalyst electrode releases the highest current density (0.25 µA cm−2) for MOR and demonstrates higher catalytic activity for the oxidation of possible intermediates such as sodium formate in MOR. In the processes of diffusion membrane purification of hydrogen, a multiple increase in the density of the penetrating flux of hydrogen through the membranes modified by the “nanostar” catalyst (up to 10.6 mmol s−1 m−2) was demonstrated in comparison with the membranes modified by the “nanoparticles” method (up to 4.49 mmol s−1 m−2). Research data may indicate that the properties of the developed pentagonally structured catalyst “nanostar” and its enhanced activity with respect to reactions involving hydrogen increase the desorption activity of the membrane, which ultimately accelerates the overall stepwise transfer of hydrogen across the membrane.

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2

Garcia-Leis, Adianez, Armida Torreggiani, Jose Vicente Garcia-Ramos, and Santiago Sanchez-Cortes. "Hollow Au/Ag nanostars displaying broad plasmonic resonance and high surface-enhanced Raman sensitivity." Nanoscale 7, no. 32 (2015): 13629–37. http://dx.doi.org/10.1039/c5nr02819a.

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3

Li, Aike, Lijuan Tang, Dan Song, Shanshan Song, Wei Ma, Liguang Xu, Hua Kuang, et al. "A SERS-active sensor based on heterogeneous gold nanostar core–silver nanoparticle satellite assemblies for ultrasensitive detection of aflatoxinB1." Nanoscale 8, no. 4 (2016): 1873–78. http://dx.doi.org/10.1039/c5nr08372a.

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4

He, Guangyuan, Xiaoyu Han, Shiyi Cao, Kaimin Cui, Qihang Tian, and Jihong Zhang. "Long Spiky Au-Ag Nanostar Based Fiber Probe for Surface Enhanced Raman Spectroscopy." Materials 15, no. 4 (February 17, 2022): 1498. http://dx.doi.org/10.3390/ma15041498.

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The detection performances of noble metal-based surface enhanced Raman spectroscopy (SERS) devices are determined by the compositions and geometries of the metal nanostructures, as well as the substrates. In the current study, long spiky Au-Ag alloy nanostars were synthesized, and both core diameters and spike lengths were controlled by Lauryl sulfobetaine concentrations (as the nanostructure growth skeleton). The long spiky star geometries were confirmed by transmission electron micrograph images. Elements energy dispersive spectrometer mapping confirmed that Au and Ag elements were inhomogeneously distributed in the nanostructures and demonstrated a higher Ag content at surface for potential better SERS performance. Selected synthesized spiky nanostars were uniformly assembled on multi-mode silica fiber for probe fabrication by silanization. The SERS performance were characterized using crystal violet (CV) and rhodamine 6G (R6G) as analyte molecules. The lowest detection limit could reach as low as 10−8 M, with a 6.23 × 106 enhancement factor, and the relationship between analyte concentrations and Raman intensities was linear for both CV and R6G, which indicated the potential qualitative and quantitative molecule detection applications. Moreover, the fiber probes also showed good reproducibility and stability in the ambient atmosphere.

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5

Petriev, I. S., S. N. Bolotin, V. Yu Frolov, and M. G. Baryshev. "Synthesis and gas transport parameters of membranes modified by starshaped nanocrystalline palladium." Доклады Академии наук 486, no. 2 (May 27, 2019): 163–67. http://dx.doi.org/10.31857/s0869-56524862163-167.

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Methods have been developed to modify the surface of Pd-23%Ag alloy films in order to increase the rate of hydrogen transfer with appearance of palladium coatings of the “nanostar” and “nanopore” types. The gas transport parameters of the membranes which surface is activated using the developed methods were investigated. The modification of surface of Pd-Ag films synthesized by star-like palladium nanocrystallites allows achieving a hydrogen flux density of up to 0.75 mmol / (s × m2) - that is 1.7 times more than in case of modification modified by “nanopore” type coating of sufficiently thin palladium membranes (< 10 µm) under low temperature (<100 °C) and pressure (<0.6 MPa).

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6

Wang, Huafeng, Ting Fang, Hua Liu, Tianxiang Wei, and Zhihui Dai. "Gold Nanostar-Based Sensitive Catechol Plasmonic Colorimetric Sensing Platform with Ultra-Wide Detection Range." Chemosensors 10, no. 11 (October 25, 2022): 439. http://dx.doi.org/10.3390/chemosensors10110439.

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High sensitivity and a wide detection range are always the pursuit of sensor design. In this work, gold nanostars (Au NSs) featuring the shape of sea urchins with an absorption peak at the near infrared region (822 nm) were prepared. We proposed a Au NSs-based plasmonic colorimetric sensing platform for ultrasensitive catechol (CC) detection with a wide detection range from 3.33 nM to 107 μM and a limit of detection (LOD) at 1 nM. The target analyte, CC, was used to reduce silver ions (Ag+) to form silver (Ag) coating on the surface of Au NSs, which caused a blue-shift in the localized surface plasmon resonance (LSPR) of Au NSs. With the gradual increase in CC concentration, the Ag coating on the surface was gradually nucleated, and the LSPR blue-shift carried on. This strategy yields a wide LSPR shift by as much as 276 nm for plasmonic effects, enabling an ultra-wide range and the ultrasensitive detection of CC. This work will facilitate the research of target-mediated LSPR sensors and their wide application in environmental monitoring, food safety, and disease diagnosis.

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7

Zhao, Yuan, Xiyu Li, Yu Liu, Lichun Zhang, Feifei Wang, and Yalin Lu. "High performance surface-enhanced Raman scattering sensing based on Au nanoparticle-monolayer graphene-Ag nanostar array hybrid system." Sensors and Actuators B: Chemical 247 (August 2017): 850–57. http://dx.doi.org/10.1016/j.snb.2017.03.063.

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8

Ke, Yan, Bin Chen, Mengen Hu, Ningning Zhou, Zhulin Huang, and Guowen Meng. "In-Situ Monitoring the SERS Spectra of para-Aminothiophenol Adsorbed on Plasmon-Tunable Au@Ag Core–Shell Nanostars." Nanomaterials 12, no. 7 (March 31, 2022): 1156. http://dx.doi.org/10.3390/nano12071156.

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Plasmon-induced photocatalysis on noble metal surfaces has attracted broad attention due to its application in sunlight energy conversion, while the selectivity of plasmonic platforms remains unclear. Herein, we present the controlled plasmon-mediated oxidation of para-aminothiophenol (p-ATP) by employing Au@Ag core–shell nanostars with tunable tip plasmons in visible–near-infrared range as reactors. In-situ Raman measurements indicate that Au@Ag core–shell nanostars essentially promote the conversion of p-ATP to 4,4′-dimercaptoazobenzene (DMAB) due to hot carriers excited by localized surface plasmon resonance. Au@Ag nanostars with plasmon modes under resonant light excitation suggested higher catalytic efficiency, as evidenced by the larger intensity ratios between 1440 cm−1 (N=N stretching of DMAB) and 1080 cm−1 shifts (C–S stretching of p-ATP). Importantly, the time-dependent surface-enhanced Raman scattering spectra showed that the conversion efficiency of p-ATP was mainly dictated by the resonance condition between the tip plasmon mode of Au@Ag core–shell nanostars and the excitation light, as well as the choice of excitation wavelength. These results show that plasmon bands of metal nanostructures play an important role in the efficiency of plasmon-driven photocatalysis.

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9

Reyes Gómez, Faustino, Rafael Rubira, Sabrina Camacho, Cibely Martin, Robson da Silva, Carlos Constantino, Priscila Alessio, Osvaldo Oliveira, and J. Mejía-Salazar. "Surface Plasmon Resonances in Silver Nanostars." Sensors 18, no. 11 (November 8, 2018): 3821. http://dx.doi.org/10.3390/s18113821.

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The recent development of silver nanostars (Ag-NSs) is promising for improved surface-enhanced sensing and spectroscopy, which may be further exploited if the mechanisms behind the excitation of localized surface plasmon resonances (LSPRs) are identified. Here, we show that LSPRs in Ag-NSs can be obtained with finite-difference time-domain (FDTD) calculations by considering the nanostars as combination of crossed nanorods (Ag-NRs). In particular, we demonstrate that an apparent tail at large wavelengths ( λ ≳ 700 nm) observed in the extinction spectra of Ag-NSs is due to a strong dipolar plasmon resonance, with no need to invoke heterogeneity (different number of arms) effects as is normally done in the literature. Our description also indicates a way to tune the strongest LSPR at desired wavelengths, which is useful for sensing applications.

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Moraes, Beatriz R., Nathalia S. Campos, Alvaro C. C. Barra, and Celly M. S. Izumi. "Surface-Enhanced Raman Scattering of MEH-PPV on Gold and Silver Nanoparticles." Journal of Spectroscopy 2018 (2018): 1–6. http://dx.doi.org/10.1155/2018/6924758.

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The interaction of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) with Au or Ag nanospheres, Au nanostars, and Ag nanoprisms was investigated using surface-enhanced Raman scattering (SERS). The SERS investigation showed that adsorption of MEH-PPV strongly depends on the nature of the nanoparticle surface. On gold nanostars that present a thick layer of capping polymer, SERS spectrum is only observed in relatively concentrated MEH-PPV solution (1 mmol L−1). On the other hand, Au and Ag nanospheres present SERS spectra down to 10−6 mol L−1 and no chemical interaction of MEH-PPV and metal surface is observed. The spectra of MEH-PPV on Ag nanoprisms with PVP as stabilizing agent suggest that the capping polymer induces a planar conformation of MEH-PPV and consequently an increase of conjugation length. These results give support for the application of MEH-PPV on optoelectronics in which interfacial effects are critical in the device efficiency and stability.

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11

Bido, Ariadne T., Britta G. Nordberg, Marit A. Engevik, Nathan C. Lindquist, and Alexandre G. Brolo. "High-Speed Fluctuations in Surface-Enhanced Raman Scattering Intensities from Various Nanostructures." Applied Spectroscopy 74, no. 11 (July 17, 2020): 1398–406. http://dx.doi.org/10.1177/0003702820940391.

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The observation of single molecule events using surface-enhanced Raman scattering (SERS) is a well-established phenomenon. These events are characterized by strong fluctuations in SERS intensities. High-speed SERS intensity fluctuations (in the microsecond time scale) have been reported for experiments involving single metallic particles. In this work, the high-speed SERS behavior of six different types of nanostructured metal systems (Ag nanoshells, Ag nanostars, Ag aggregated spheres, Au aggregated spheres, particle-on-mirror, and Ag deposited on microspheres) was investigated. All systems demonstrated high-speed SERS intensity fluctuations. Statistical analysis of the duration of the SERS fluctuations yielded tailed distributions with average event durations around 100 μs. Although the characteristics of the fluctuations seem to be random, the results suggest interesting differences between the system that might be associated with the strength distribution and density of the localized SERS hotspots. For instance, systems with more localized fields, such as nanostars, present faster fluctuation bursts compared to metallic aggregates that support spread-out fields. The results presented here appear to confirm that high-speed SERS intensity fluctuations are a fundamental characteristic of the SERS effect.

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12

Kaur, Gagandeep, Swati Tanwar, Vishaldeep Kaur, Rathindranath Biswas, Sangeeta Saini, Krishna Kanta Haldar, and Tapasi Sen. "Interfacial design of gold/silver core–shell nanostars for plasmon-enhanced photocatalytic coupling of 4-aminothiophenol." Journal of Materials Chemistry C 9, no. 42 (2021): 15284–94. http://dx.doi.org/10.1039/d1tc03733a.

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An interfacial designing procedure is presented for the fabrication of bimetallic hybrid nanomaterials to serve as highly efficient SERS substrate and plasmon driven catalyst for dimerization reaction of PATP utilizing Au/Ag core–shell nanostars.

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13

Revnic, Radu Nicolae, Gabriela Fabiola Știufiuc, Valentin Toma, Anca Onaciu, Alin Moldovan, Adrian Bogdan Țigu, Eva Fischer-Fodor, Romulus Tetean, Emil Burzo, and Rareș Ionuț Știufiuc. "Facile Microwave Assisted Synthesis of Silver Nanostars for Ultrasensitive Detection of Biological Analytes by SERS." International Journal of Molecular Sciences 23, no. 15 (August 8, 2022): 8830. http://dx.doi.org/10.3390/ijms23158830.

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We report a very simple, rapid and reproducible method for the fabrication of anisotropic silver nanostars (AgNS) that can be successfully used as highly efficient SERS substrates for different bioanalytes, even in the case of a near-infra-red (NIR) excitation laser. The nanostars have been synthesized using the chemical reduction of Ag+ ions by trisodium citrate. This is the first research reporting the synthesis of AgNS using only trisodium citrate as a reducing and stabilizing agent. The key elements of this original synthesis procedure are rapid hydrothermal synthesis of silver nanostars followed by a cooling down procedure by immersion in a water bath. The synthesis was performed in a sealed bottom flask homogenously heated and brought to a boil in a microwave oven. After 60 s, the colloidal solution was cooled down to room temperature by immersion in a water bath at 35 °C. The as-synthesized AgNS were washed by centrifugation and used for SERS analysis of test molecules (methylene blue) as well as biological analytes: pharmaceutical compounds with various Raman cross sections (doxorubicin, atenolol & metoprolol), cell lysates and amino acids (methionine & cysteine). UV-Vis absorption spectroscopy, (Scanning) Transmission Electron Microscopy ((S)TEM) and Atomic Force Microscopy (AFM) have been employed for investigating nanostars’ physical properties.

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14

Kohansal, Fereshteh, Ahmad Mobed, Mohammad Hasanzadeh, Ali Ahmadalipour, and Nasrin Shadjou. "Synthesis, characterization, and application of gold nanostars for the identification of 2-Arachidonoyl glycerol." Medical Journal of Tabriz University of Medical Sciences 44, no. 4 (October 16, 2022): 290–304. http://dx.doi.org/10.34172/mj.2022.036.

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Background. The endocannabinoid system (ECS) is a complex of neurotransmitters in the central nervous system (CNS) and plays a key role in regulating cognitive and physiological processes. Also, 2-Arachidonoylglycerol (2-AG) is one of the imperative endocannabinoids with key roles in the CNS. It acts as a signaling lipid and activates the cannabinoid CB1 receptor. In addition, 2-AG is involved in a variety of physiological functions such as energy balance, emotion, pain sensation, cognition, and neuroinflammation. Hence, rapid and specific diagnosis of 2-AG is of great importance in medical neuroscience. Routine methods used in detection of 2-AG are not sensitive and specific. Therefore, the development of new methods in this area has been one of the most important research areas in recent years. Methods. Herein, an innovative immunosensor was developed for quantification of 2-AG. To this end, gold nanostars (GNSs) were synthesized and conjugated with a specific biotinylated antibody activated by EDC/NHS against 2-AG. The resultant bio-conjugate was immobilized on the gold electrode surface and used to detect and analyze 2-arachidonylglycerol antigen by cyclic voltammetry (CV), square wave voltammetry (SWV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy techniques. Results. For the first time, 2-AG protein was measured with an excellent linear range of 0.00048-1 ng/L and lower limit of quantification of 0.00048 ng/L by electroanalysis method. The designed immunosensor showed high sensitivity and specificity in the presence of interfering antigens, which proved its appropriate use in the diagnosis of neurological disorders. Conclusion. The remarkable achievement of the present study is the development of a new immunosensor for the sensitive and accurate detection of 2-AG. The fabricated sensor substrate showed good analytical results for the target analyte. Regardless of the appropriate sensitivity and selectivity of the designed biosensor, the stability of the sensor is low and it is recommended to use it immediately after preparation. Also, the immunosensor engineered in this research was very economical and had a very fast and good performance compared to the usual and traditional methods for detecting 2-AG. Practical Implications. For the first time, 2-AG protein was measured with an excellent linear range of 0.00048-1 ng/L and lower limit of quantification of 0.00048 ng/L by electro analysis method. The designed immunosensor showed high sensitivity and specificity in the presence of interfering antigens, which proved its appropriate use in the diagnosis of neurological disorders.

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Grisoli, Pietro, Lorenzo De Vita, Chiara Milanese, Angelo Taglietti, Yuri Diaz Fernandez, Margaux Bouzin, Laura D’Alfonso, et al. "PVA Films with Mixed Silver Nanoparticles and Gold Nanostars for Intrinsic and Photothermal Antibacterial Action." Nanomaterials 11, no. 6 (May 25, 2021): 1387. http://dx.doi.org/10.3390/nano11061387.

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PVA films with embedded either silver nanoparticles (AgNP), NIR-absorbing photothermal gold nanostars (GNS), or mixed AgNP+GNS were prepared in this research. The optimal conditions to obtain stable AgNP+GNS films with intact, long lasting photothermal GNS were obtained. These require coating of GNS with a thiolated polyethylene glycol (PEG) terminated with a carboxylic acid function, acting as reticulant in the film formation. In the mixed AgNP+GNS films, the total noble metal content is <0.15% w/w and in the Ag films < 0.025% w/w. The slow but prolonged Ag+ release from film-embedded AgNP (8–11% of total Ag released after 24 h, in the mixed films) results in a very strong microbicidal effect against planktonic Escherichia coli and Staphylococcus aureus bacterial strains (the release of Au from films is instead negligible). Beside this intrinsic effect, the mixed films also exert an on-demand, fast hyperthermal bactericidal action, switched on by NIR laser irradiation (800 nm, i.e., inside the biotransparent window) of the localized surface plasmon resonance (LSPR) absorption bands of GNS. Temperature increases of 30 °C are obtained using irradiances as low as 0.27 W/cm2. Moreover, 80–90% death on both strains was observed in bacteria in contact with the GNS-containing films, after 30 min of irradiation. Finally, the biocompatibility of all films was verified on human fibroblasts, finding negligible viability decrease in all cases.

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Parmigiani, Miriam, Benedetta Albini, Giovanni Pellegrini, Marco Genovesi, Lorenzo De Vita, Piersandro Pallavicini, Giacomo Dacarro, Pietro Galinetto, and Angelo Taglietti. "Surface-Enhanced Raman Spectroscopy Chips Based on Silver Coated Gold Nanostars." Nanomaterials 12, no. 20 (October 14, 2022): 3609. http://dx.doi.org/10.3390/nano12203609.

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Surface-enhanced Raman scattering (SERS) is becoming widely used as an analytical tool, and the search for stable and highly responsive SERS substrates able to give ultralow detection of pollutants is a current challenge. In this paper we boosted the SERS response of Gold nanostars (GNS) demonstrating that their coating with a layer of silver having a proper thickness produces a 7-fold increase in SERS signals. Glass supported monolayers of these GNS@Ag were then prepared using simple alcoxyliane chemistry, yielding efficient and reproducible SERS chips, which were tested for the detection of molecules representative of different classes of pollutants. Among them, norfloxacin was detected down to 3 ppb, which is one of the lowest limits of detection obtained with this technique for the analyte.

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LI, Manli, Yuan ZHAO, Malin CUI, Chan WANG, and Qijun SONG. "SERS-active Ag Nanostars Substrates for Sensitive Detection of Ethyl Carbamate in Wine." Analytical Sciences 32, no. 7 (2016): 725–28. http://dx.doi.org/10.2116/analsci.32.725.

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18

Tian, Qihang, Shiyi Cao, Guangyuan He, Yuting Long, Xuedong Zhou, Jihong Zhang, Jun Xie, and Xiujian Zhao. "Plasmonic Au-Ag alloy nanostars based high sensitivity surface enhanced Raman spectroscopy fiber probes." Journal of Alloys and Compounds 900 (April 2022): 163345. http://dx.doi.org/10.1016/j.jallcom.2021.163345.

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Rubira, Rafael Jesus Gonçalves, Sabrina Alessio Camacho, Cibely Silva Martin, Jorge Ricardo Mejía-Salazar, Faustino Reyes Gómez, Robson Rosa da Silva, Osvaldo Novais de Oliveira Junior, Priscila Alessio, and Carlos José Leopoldo Constantino. "Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS)." Sensors 20, no. 1 (December 18, 2019): 15. http://dx.doi.org/10.3390/s20010015.

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Detection of the drug Levodopa (3,4-dihydroxyphenylalanine, L-Dopa) is essential for the medical treatment of several neural disorders, including Parkinson’s disease. In this paper, we employed surface-enhanced Raman scattering (SERS) with three shapes of silver nanoparticles (nanostars, AgNS; nanospheres, AgNP; and nanoplates, AgNPL) to detect L-Dopa in the nanoparticle dispersions. The sensitivity of the L-Dopa SERS signal depended on both nanoparticle shape and L-Dopa concentration. The adsorption mechanisms of L-Dopa on the nanoparticles inferred from a detailed analysis of the Raman spectra allowed us to determine the chemical groups involved. For instance, at concentrations below/equivalent to the limit found in human plasma (between 10−7–10−8 mol/L), L-Dopa adsorbs on AgNP through its ring, while at 10−5–10−6 mol/L adsorption is driven by the amino group. At even higher concentrations, above 10−4 mol/L, L-Dopa polymerization predominates. Therefore, our results show that adsorption depends on both the type of Ag nanoparticles (shape and chemical groups surrounding the Ag surface) and the L-Dopa concentration. The overall strategy based on SERS is a step forward to the design of nanostructures to detect analytes of clinical interest with high specificity and at varied concentration ranges.

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Zhao, Jing, Chen Wu, Lipeng Zhai, Xiaofeng Shi, Xin Li, Guojun Weng, Jian Zhu, Jianjun Li, and Jun-Wu Zhao. "A SERS-based immunoassay for the detection of α-fetoprotein using AuNS@Ag@SiO2core–shell nanostars." Journal of Materials Chemistry C 7, no. 27 (2019): 8432–41. http://dx.doi.org/10.1039/c9tc01890e.

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Zhu, Jian, Xiao-Hong Chen, Jian-Jun Li, and Jun-Wu Zhao. "The synthesis of Ag-coated tetrapod gold nanostars and the improvement of surface-enhanced Raman scattering." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 211 (March 2019): 154–65. http://dx.doi.org/10.1016/j.saa.2018.12.001.

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Zalaffi, Maria Sole, Lucio Litti, Patrizia Canton, Moreno Meneghetti, Ligia Maria Moretto, and Paolo Ugo. "Preparation and characterization of Ag-nanostars@Au-nanowires hierarchical nanostructures for highly sensitive surface enhanced Raman spectroscopy." Nano Express 1, no. 2 (July 7, 2020): 020006. http://dx.doi.org/10.1088/2632-959x/aba104.

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Li, Jian-Jun, Chen Wu, Jing Zhao, Guo-Jun Weng, Jian Zhu, and Jun-Wu Zhao. "Synthesis and SERS activity of super-multibranched Au Ag nanostructure via silver coating-induced aggregation of nanostars." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 204 (November 2018): 380–87. http://dx.doi.org/10.1016/j.saa.2018.06.080.

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Ye, Ziwei, Chunchun Li, Maurizio Celentano, Matthew Lindley, Tamsin O’Reilly, Adam J. Greer, Yiming Huang, et al. "Surfactant-free Synthesis of Spiky Hollow Ag–Au Nanostars with Chemically Exposed Surfaces for Enhanced Catalysis and Single-Particle SERS." JACS Au 2, no. 1 (December 16, 2021): 178–87. http://dx.doi.org/10.1021/jacsau.1c00462.

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Li, Jian-Jun, Xiao-Hong Chen, Guo-Jun Weng, Jian Zhu, and Jun-Wu Zhao. "A highly specific and sensitive fluorescence quenching probe for carcinoembryonic antigen detection based on tetrapod Au nanostars with Ag coating." Materials Today Communications 25 (December 2020): 101373. http://dx.doi.org/10.1016/j.mtcomm.2020.101373.

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Zalaffi, Maria Sole, Ines Agostinelli, Najmeh Karimian, and Paolo Ugo. "Ag-Nanostars for the Sensitive SERS Detection of Dyes in Artistic Cross-Sections—Madonna della Misericordia of the National Gallery of Parma: A Case Study." Heritage 3, no. 4 (November 12, 2020): 1344–59. http://dx.doi.org/10.3390/heritage3040074.

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In historical paintings, the detection of low amounts of pigments and dyes by Raman spectroscopy can sometimes be challenging, in particular for fluorescent dyes. This issue can be overcome by using SERS (surface-enhanced Raman spectroscopy) which takes advantage of the properties of nanostructured metal surfaces to quench fluorescence and enhance Raman signals. In this work, silver nanostars (AgNSs) are applied for the first time to real art samples, in particular to painting cross-sections, exploiting their effective SERS properties for pigment identification. The case study is the Madonna della Misericordia of the National Gallery of Parma (Italy). Cross-sections were analyzed at first by optical microscopy, SEM-EDS, and micro-Raman spectroscopy. Unfortunately, in some cross-sections, the application of conventional Raman spectroscopy was hindered by an intense background fluorescence. Therefore, AgNSs were deposited and used as SERS-active agent. The experimentation was successful, allowing us to identify a modern dye, namely copper phthalocyanine. This result, together with the detection of other modern pigments (titanium white) and expert visual examination, allowed to reconstruct the painting history, postdating its realization from the 15th century (according to the Gallery inventory) to 19th century with a heavy role of recent (middle 20th century) restoration interventions.

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Yao, Yao, Tianyu Chen, Wei Mao, Yi Zhong, Shuaishuai Dai, Xuemin Zeng, Chang Liu, et al. "Three-dimensional DNA/Ni-Fe layered double oxide frame networks-induced “cusp-exposure” of Au@Ag nanostars for ultrasensitive determination of kanamycin." Sensors and Actuators B: Chemical 343 (September 2021): 130082. http://dx.doi.org/10.1016/j.snb.2021.130082.

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Tran, Vi, Christian Thiel, Jan Taro Svejda, Mandana Jalali, Bernd Walkenfort, Daniel Erni, and Sebastian Schlücker. "Probing the SERS brightness of individual Au nanoparticles, hollow Au/Ag nanoshells, Au nanostars and Au core/Au satellite particles: single-particle experiments and computer simulations." Nanoscale 10, no. 46 (2018): 21721–31. http://dx.doi.org/10.1039/c8nr06028b.

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Kaur, Vishaldeep, Mridu Sharma, and Tapasi Sen. "DNA Origami-Templated Bimetallic Nanostar Assemblies for Ultra-Sensitive Detection of Dopamine." Frontiers in Chemistry 9 (December 23, 2021). http://dx.doi.org/10.3389/fchem.2021.772267.

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The abundance of hotspots tuned via precise arrangement of coupled plasmonic nanostructures highly boost the surface-enhanced Raman scattering (SERS) signal enhancements, expanding their potential applicability to a diverse range of applications. Herein, nanoscale assembly of Ag coated Au nanostars in dimer and trimer configurations with tunable nanogap was achieved using programmable DNA origami technique. The resulting assemblies were then utilized for SERS-based ultra-sensitive detection of an important neurotransmitter, dopamine. The trimer assemblies were able to detect dopamine with picomolar sensitivity, and the assembled dimer structures achieved SERS sensitivity as low as 1 fM with a limit of detection of 0.225 fM. Overall, such coupled nanoarchitectures with superior plasmon tunability are promising to explore new avenues in biomedical diagnostic applications.

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Kaur, Vishaldeep, Swati Tanwar, Gagandeep Kaur, and Tapasi Sen. "DNA‐Origami‐Based Assembly of Au@Ag Nanostar Dimer Nanoantennas for Label‐Free Sensing of Pyocyanin." ChemPhysChem, December 17, 2020. http://dx.doi.org/10.1002/cphc.202000805.

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Berlina, Anna N., Maria Y. Ragozina, Nadezhda S. Komova, Kseniya V. Serebrennikova, Anatoly V. Zherdev, and Boris B. Dzantiev. "Сomparison of Au, Au-Pt, and Au-Ag nanoparticles as markers for immunochromatographic determination of nonylphenol." Chimica Techno Acta 10, no. 1 (December 19, 2022). http://dx.doi.org/10.15826/chimtech.2023.10.1.03.

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Gold spherical nanoparticles, gold-platinum nanoflowers, and gold-silver nanostars were obtained and compared as labels for immunochromatographic analysis. The nanoparticles were synthesized by chemical reduction from various precursors and then conjugated with staphylococcal protein A to be used in indirect immunochromatographic determination of nonylphenol. The results obtained were evaluated in terms of analytical characteristics and R2 value, as well as the color intensity of the test band. According to the comparison results, it was revealed that the R2 value varied from 0.82 for the gold-silver nanostars to 0.96 for the spherical gold nanoparticles. The working range of determined concentrations was from 2 to 100 μg/mL for unspherical and from 2 to 50 μg/mL – for spherical markers used; the analysis time was 20 min.

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"Industry Watch." Asia-Pacific Biotech News 11, no. 23n24 (December 30, 2007): 1534–47. http://dx.doi.org/10.1142/s0219030307001668.

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GlaxoSmithKline and OncoMed Pharmaceuticals Form Strategic Alliance to Develop Cancer Stem Cell Antibody Therapeutics. BioArctic Neuroscience and Eisai Enter Into Exclusive Licensing Agreement with Novel Antibody Treatment for Alzheimer's Disease. Japan Bioventures Today — Japan Animal Referral Medical Center. Agilent Technologies Collaborates with BioNanomatrix to Develop Genetic Analysis System. Eisai Opens Regional Clinical Research Center in Singapore. GE Healthcare and Novavax to Develop and Market Pandemic Infuenza Solution. Nanostart AG Marks Entry into Asia as Lead Investor in Singapore's Biomed Start-Up Curiox Biosystems. QIAGEN and Bio*One Capital Enter into Joint Venture to Develop Molecular Diagnostics Products. Binex and MaxCyte Collaborate on Cancer Immunotherapy Research.

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Atta, Supriya, and Tuan Vo-Dinh. "Ultra-trace SERS detection of cocaine and heroin using bimetallic gold–silver nanostars (BGNS-Ag)." Analytica Chimica Acta, February 2023, 340956. http://dx.doi.org/10.1016/j.aca.2023.340956.

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Chen, Xiao-Hong, Jian Zhu, Jian-Jun Li, and Jun-Wu Zhao. "A plasmonic and SERS dual-mode iodide ions detecting probe based on the etching of Ag-coated tetrapod gold nanostars." Journal of Nanoparticle Research 21, no. 7 (July 2019). http://dx.doi.org/10.1007/s11051-019-4604-4.

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Kist, Jennifer A., Jeremy B. Essner, Jonathan D. Woodward, and Gary A. Baker. "Silver‐mediated Squaric Acid Reduction as a Facile, Ambient‐temperature and Seedless Route to Tunable Bimetallic Au/Ag Nanostars and Nanosnowflakes." ChemNanoMat, June 16, 2022. http://dx.doi.org/10.1002/cnma.202200189.

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