Готові списки джерел за темами / Blue emitting gold nanoclusters

Добірка наукової літератури з теми "Blue emitting gold nanoclusters"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Blue emitting gold nanoclusters"

Molaabasi, Fatemeh, Saman Hosseinkhani, Ali Akbar Moosavi-Movahedi, and Mojtaba Shamsipur. "Hydrogen peroxide sensitive hemoglobin-capped gold nanoclusters as a fluorescence enhancing sensor for the label-free detection of glucose." RSC Advances 5, no. 42 (2015): 33123–35. http://dx.doi.org/10.1039/c5ra00335k.

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Lee, Eun Sung, Byung Seok Cha, Seokjoon Kim, and Ki Soo Park. "Synthesis of Exosome-Based Fluorescent Gold Nanoclusters for Cellular Imaging Applications." International Journal of Molecular Sciences 22, no. 9 (April 23, 2021): 4433. http://dx.doi.org/10.3390/ijms22094433.

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In recent years, fluorescent metal nanoclusters have been used to develop bioimaging and sensing technology. Notably, protein-templated fluorescent gold nanoclusters (AuNCs) are attracting interest due to their excellent fluorescence properties and biocompatibility. Herein, we used an exosome template to synthesize AuNCs in an eco-friendly manner that required neither harsh conditions nor toxic chemicals. Specifically, we used a neutral (pH 7) and alkaline (pH 11.5) pH to synthesize two different exosome-based AuNCs (exo-AuNCs) with independent blue and red emission. Using field-emission scanning electron microscopy, energy dispersive X-ray microanalysis, nanoparticle tracking analysis, and X-ray photoelectron spectroscopy, we demonstrated that AuNCs were successfully formed in the exosomes. Red-emitting exo-AuNCs were found to have a larger Stokes shift and a stronger fluorescence intensity than the blue-emitting exo-AuNCs. Both exo-AuNCs were compatible with MCF-7 (human breast cancer), HeLa (human cervical cancer), and HT29 (human colon cancer) cells, although blue-emitting exo-AuNCs were cytotoxic at high concentrations (≥5 mg/mL). Red-emitting exo-AuNCs successfully stained the nucleus and were compatible with membrane-staining dyes. This is the first study to use exosomes to synthesize fluorescent nanomaterials for cellular imaging applications. As exosomes are naturally produced via secretion from almost all types of cell, the proposed method could serve as a strategy for low-cost production of versatile nanomaterials.

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Chiechio, Regina M., Solène Ducarre, Célia Marets, Aurélien Dupont, Pascale Even-Hernandez, Xavier Pinson, Stéphanie Dutertre, et al. "Encapsulation of Luminescent Gold Nanoclusters into Synthetic Vesicles." Nanomaterials 12, no. 21 (November 2, 2022): 3875. http://dx.doi.org/10.3390/nano12213875.

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Gold nanoclusters (Au NCs) are attractive luminescent nanoprobes for biomedical applications. In vivo biosensing and bioimaging requires the delivery of the Au NCs into subcellular compartments. In this view, we explore here the possible encapsulation of ultra-small-sized red and blue emitting Au NCs into liposomes of various sizes and chemical compositions. Different methods were investigated to prepare vesicles containing Au NCs in their lumen. The efficiency of the process was correlated to the structural and morphological aspect of the Au NCs’ encapsulating vesicles thanks to complementary analyses by SAXS, cryo-TEM, and confocal microscopy techniques. Cell-like-sized vesicles (GUVs) encapsulating red or blue Au NCs were successfully obtained by an innovative method using emulsion phase transfer. Furthermore, exosome-like-sized vesicles (LUVs) containing Au NCs were obtained with an encapsulation yield of 40%, as estimated from ICP-MS.

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Lopez, Anand, and Juewen Liu. "DNA-templated fluorescent gold nanoclusters reduced by Good’s buffer: from blue-emitting seeds to red and near infrared emitters." Canadian Journal of Chemistry 93, no. 6 (June 2015): 615–20. http://dx.doi.org/10.1139/cjc-2014-0600.

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DNA-templated fluorescent gold nanoclusters (AuNCs) have been recently prepared showing higher photostability than the silver counterpart. In this work, we examined the effect of pH, DNA length, DNA sequence, and reducing agent. Citrate, HEPES, and MES produce blue emitters, glucose and NaBH4 cannot produce fluorescent AuNCs, while ascorbate shows blue emission even in the absence of DNA. This is the first report of using Good’s buffer for making fluorescent AuNCs. Dimethylamine borane (DMAB) produces red emitters. Poly-C DNA produces AuNCs only at low pH and each DNA chain can only bind to a few gold atoms, regardless of the DNA length. Otherwise, large nonfluorescent gold nanoparticles (AuNPs) are formed. Each poly-A DNA might template a few independent AuNCs. The blue emitters can be further reduced to form red emitters by adding DMAB. The emission color is mainly determined by the type of reducing agent instead of DNA sequence.

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Tahir, Fernando Lazaro Freire Jr, Ricardo Q. Aucelio, Marco Cremona, Juliana da S. Padilha, Giancarlo Margheri, Quaid Zaman, et al. "Quenching of the Photoluminescence of Gold Nanoclusters Synthesized by Pulsed Laser Ablation in Water upon Interaction with Toxic Metal Species in Aqueous Solution." Chemosensors 11, no. 2 (February 5, 2023): 118. http://dx.doi.org/10.3390/chemosensors11020118.

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Sensors for the detection of heavy metal ions in water are in high demand due to the danger they pose to both the environment and human health. Among their possible detection approaches, modulation of the photoluminescence of gold nanoclusters (AuNCs) is gaining wide interest as an alternative to classical analytical methods based on complex and high-cost instrumentation. In the present work, luminescent oxidized AuNCs emitting in both ultraviolet (UV) and visible (blue) regions were synthesized by pulsed laser ablation of a gold target in NaOH aqueous solution, followed by different bleaching processes. High-resolution electron microscopy and energy-dispersive X-ray scattering confirmed the presence of oxygen and gold in the transparent photoluminescent clusters, with an average diameter of about 3 nm. The potentialities of the bleached AuNCs colloidal dispersions for the detection of heavy metal ions were studied by evaluating the variation in photoluminescence in the presence of Cd2+, Pb2+, Hg2+ and CH3Hg+ ions. Different responses were observed in the UV and visible (blue) spectral regions. The intensity of blue emission decreased (no more than 10%) and saturated at concentrations higher than 20 ppb for all the heavy metal ions tested. In contrast, the UV band emission was remarkably affected in the presence of Hg2+ ions, thus leading to signal variations for concentrations well beyond 20 ppb (the concentration at which saturation occurs for other ions). The limit of detection for Hg2+ is about 3 ppb (15 nmol/L), and the photoluminescence intensity diminishes linearly by about 75% up to 600 ppb. The results are interpreted based on the ligand-free interaction, i.e., the metallophilic bonding formation of Hg2+ and Au+ oxide present on the surface of the UV-emitting nanoclusters.

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Xu, Shenghao, Xin Lu, Chenxi Yao, Fu Huang, Hua Jiang, Wenhao Hua, Na Na, Haiyan Liu, and Jin Ouyang. "A Visual Sensor Array for Pattern Recognition Analysis of Proteins Using Novel Blue-Emitting Fluorescent Gold Nanoclusters." Analytical Chemistry 86, no. 23 (November 17, 2014): 11634–39. http://dx.doi.org/10.1021/ac502643s.

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Moreaud, Laureen, Janak Prasad, Serges Mazères, Cécile Marcelot, Clothilde Comby-Zerbino, Rodolphe Antoine, Olivier Heintz, and Erik Dujardin. "Facile one-pot synthesis of white emitting gold nanocluster solutions composed of red, green and blue emitters." Journal of Materials Chemistry C 10, no. 6 (2022): 2263–70. http://dx.doi.org/10.1039/d1tc04874k.

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Yen, Yao-Te, Ting-Yueh Chen, Chun-Yu Chen, Chi-Lun Chang, San-Chong Chyueh, and Huan-Tsung Chang. "A Photoluminescent Colorimetric Probe of Bovine Serum Albumin-Stabilized Gold Nanoclusters for New Psychoactive Substances: Cathinone Drugs in Seized Street Samples." Sensors 19, no. 16 (August 15, 2019): 3554. http://dx.doi.org/10.3390/s19163554.

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Screening of illicit drugs for new psychoactive substances—namely cathinone—at crime scenes is in high demand. A dual-emission bovine serum albumin-stabilized gold nanoclusters probe was synthesized and used for quantitation and screening of 4-chloromethcathinone and cathinone analogues in an aqueous solution. The photoluminescent (PL) color of the bovine serum albumin-stabilized Au nanoclusters (BSA-Au NCs) probe solution changed from red to dark blue during the identification of cathinone drugs when excited using a portable ultraviolet light-emitting diodes lamp (365 nm). This probe solution allows the PL color-changing point and limit of detection down to 10.0 and 0.14 mM, respectively, for 4-chloromethcathinone. The phenomenon of PL color-changing of BSA-Au NCs was attributed to its PL band at 650 nm, quenching through an electron transfer mechanism. The probe solution was highly specific to cathinone drugs, over other popular illicit drugs, including heroin, cocaine, ketamine, and methamphetamine. The practicality of this BSA-Au NCs probe was assessed by using it to screen illicit drugs seized by law enforcement officers. All 20 actual cases from street and smuggling samples were validated using this BSA-Au NCs probe solution and then confirmed using gas chromatography–mass spectrometry. The results reveal this BSA-Au NCs probe solution is practical for screening cathinone drugs at crime scenes.

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Kennedy, Thomas A. C., James L. MacLean, and Juewen Liu. "Blue emitting gold nanoclusters templated by poly-cytosine DNA at low pH and poly-adenine DNA at neutral pH." Chemical Communications 48, no. 54 (2012): 6845. http://dx.doi.org/10.1039/c2cc32841k.

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Putra, Ridwan P., Yoshinori Ikumura, Hideyuki Horino, Akiko Hori, and Izabela I. Rzeznicka. "Adsorption and Conformation of Bovine Serum Albumin with Blue-Emitting Gold Nanoclusters at the Air/Water and Lipid/Water Interfaces." Langmuir 35, no. 50 (November 25, 2019): 16576–82. http://dx.doi.org/10.1021/acs.langmuir.9b02831.

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Дисертації з теми "Blue emitting gold nanoclusters"

Cheng, Kai-Ping, and 鄭凱平. "Applications of gold nanoclusters in light-emitting diodes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/rtx469.

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碩士
中原大學
物理研究所
105
This thesis aims at realizing a light-emitting diode using which yellow-light-emitting gold nanoclusters were blend with blue-light-emitting orangic host materials as an emissive layer. The TOP-capped Au NCs were prepared by sonochemical method. The structure used in this thesis is ITO/PEDOT:PSS/EML/LiF/Al. Blue light-emitting host material PVK, electron transport material PBD, hole transport material TPD and yellow light-emitting material TOP-capped Au NCs blended with volume ratio(PVK:PBD:TPD:Au NCs =61:24:9:282. The excition generation can be achieved via charge trapping, Förster energy transfer from the host to the Au NCs, or through interfacial exciplex states. White light LEDs can be generated through mixing the electroluminescence from two complementary colors. Using the instrument measurement device brightness, current density, current efficiency, power efficiency and CIE chromaticity. We successfully demonstrated the white-LEDs based on non-toxic Au NCs with a current efficiency of 0.32 Cd/A and CIE chromaticity coordinates of (0.27, 0.33) were obtained from our experimental analysis, which is quite close to the ideal pure white emission coordinates (0.33, 0.33). However, the utilization of toxic elements such as lead cadmium in current optoelectronic devices on the basis of colloidal quantum dots raises environmental concerns. Here we demonstrate for the first time that white-light-emitting diodes can be achieved by utilizing non-toxic and environment-friendly gold nanoclusters.

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Тези доповідей конференцій з теми "Blue emitting gold nanoclusters"

Baba, Tsutomu, Hidekazu Ishitobi, Kyoko Masui, and Yasushi Inouye. "Synthesis and evaluation of fluorescent palladium nanoclusters." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.8a_a409_3.

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Metal nanoclusters consisting of a few to several tens of atoms have discrete energy states due to quantum size effects, which allows them to emit fluorescent. The fluorescent wavelength is dependent on the size of metal nanoclusters [1]. Much of studies on fluorescent metal nanoclusters have been focused on gold and silver. Recently we have succeeded in synthesizing platinum (Pt) nanoclusters which emit blue to yellow fluorescence [2-5]. Here we report on synthesis of fluorescent nanoclusters consisting of palladium (Pd) atoms.

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