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Littérature scientifique sur le sujet « Fluorescent Metal Nanoclusters »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Fluorescent Metal Nanoclusters"

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Liu, Mingxian, Fenglin Tang, Zhengli Yang, Jing Xu et Xiupei Yang. « Recent Progress on Gold-Nanocluster-Based Fluorescent Probe for Environmental Analysis and Biological Sensing ». Journal of Analytical Methods in Chemistry 2019 (2 janvier 2019) : 1–10. http://dx.doi.org/10.1155/2019/1095148.

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Gold nanoclusters (AuNCs) are one of metal nanoclusters, which play a pivotal role in the recent advances in the research of fluorescent probes for their fluorescence effect. They are favored by most researchers due to their strong stability in fluorescence and adjustability in fluorescence wavelength when compared to traditional organic fluorescent dyes. In this review, we introduce various synthesis strategies of gold-nanocluster-based fluorescent probes and summarize their application for environmental analysis and biological sensing. The use of gold-nanocluster-based fluorescent probes for the analysis of heavy metals and inorganic and organic pollutants is covered in the environmental analysis while biological labeling, imaging, and detection are presented in biological sensing.
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He, Ying. « Application of Biomimetic Nanomaterials in Biological Detection and the Intelligent Recognition Method of Nanoparticle Images ». Journal of Nanoelectronics and Optoelectronics 16, no 1 (1 janvier 2021) : 23–30. http://dx.doi.org/10.1166/jno.2021.2904.

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New nanomaterials (metal nanoclusters, graphene, etc.) are favored by researchers due to their unique properties and are widely used in biomedical detection. The excellent fluorescence characteristics of gold nanoclusters are utilized to develop a fast and highly sensitive bionic nanomaterial with non-label and dual functions, which can detect silver ions and mercury ions and study the particularity of TEM nanoparticle images. The particle segmentation of TEM nanoparticle images is studied to compare the traditional watershed algorithm and watershed transformation algorithm. The experiment results show that silver ions can enhance the fluorescence of gold nanoclusters to form gold-silver nanoclusters with strong yellow fluorescence, and mercury ions can quickly weaken the fluorescence of gold-silver nanoclusters. Based on the biomimetic nanomaterials, a dual-function fluorescent probe is designed to detect silver ions and mercury ions in lake with detection accuracy of 8 nM and 33 nM respectively; the sensing excitation of the fluorescent probe is further analyzed. Because the metal-enhanced fluorescence (MEF) effect enables the silver element and Au nanoparticles to form fluorescence-enhancing effect, the high metalphilic interaction between mercury ions and silver ions quenches the fluorescence effect of gold nanocluster; the rapid watershed transformation/region fusion method can achieve better particle image segmentation combined with the image segmentation algorithms of different TEM nanoparticles, which can be better applied to the characterization analysis of the preparation of gold nanomaterials.
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Suber, Lorenza, Luciano Pilloni, Kshitij Khanna, Giuliana Righi, Ludovica Primitivo, Martina De Angelis et Daniela Caschera. « Fine-Tuning Synthesis of Fluorescent Silver Thiolate Nanoclusters ». Journal of Nanoscience and Nanotechnology 21, no 5 (1 mai 2021) : 2816–23. http://dx.doi.org/10.1166/jnn.2021.19048.

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Noble metal thiolate nanoclusters are a new class of nanomaterials with molecular-like properties such as high dispersibility and fluorescence in the visible and infrared spectral region, properties highly requested in biomedicine for imaging, sensing and drug delivery applications. We report on three new silver phenylethane thiolate nanoclusters, differing for slight modifications of the preparation, i.e., the reaction solvent and the thiolate quantity, producing changes in the nanocluster composition as well as in the fluorescence behavior. All samples, excited in the range 250–500 nm, emit around 400 and 700 nm differing in the emission maxima and behavior. The silver thiolate nanoclusters have been characterized by way of C, H, S elemental analyses and Thermal Gravimetric Analysis (TGA) to determine the nanocluster composition, Scanning Transmission Electron Microscopy (STEM) to investigate the nanocluster morphology and UV-Vis and fluorescence spectroscopy to study their optical properties.
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Song, Chunxia, Jingyuan Xu, Ying Chen, Liangliang Zhang, Ying Lu et Zhihe Qing. « DNA-Templated Fluorescent Nanoclusters for Metal Ions Detection ». Molecules 24, no 22 (19 novembre 2019) : 4189. http://dx.doi.org/10.3390/molecules24224189.

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DNA-templated fluorescent nanoclusters (NCs) have attracted increasing research interest on account of their prominent features, such as DNA sequence-dependent fluorescence, easy functionalization, wide availability, water solubility, and excellent biocompatibility. Coupling DNA templates with complementary DNA, aptamers, G-quadruplex, and so on has generated a large number of sensors. Additionally, the preparation and applications of DNA-templated fluorescent NCs in these sensing have been widely studied. This review firstly focuses on the properties of DNA-templated fluorescent NCs, and the synthesis of DNA-templated fluorescent NCs with different metals is then discussed. In the third part, we mainly introduce the applications of DNA-templated fluorescent NCs for sensing metal ions. At last, we further discuss the future perspectives of DNA-templated fluorescent NCs in the synthesis and sensing metal ions in the environmental and biological fields.
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Ai, Lin, Min Tang, Ji Li, Hsiao Hsien Chen et Hong Meng. « Ultra-Bright 2D Assembled Copper Nanoclusters : Fluorescence Mechanism Exploration and LED Application ». Materials Science Forum 996 (juin 2020) : 20–25. http://dx.doi.org/10.4028/www.scientific.net/msf.996.20.

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Novel fluorescent nanomaterials have attracted enormous interests in the applications of illumination and display besides the traditional organic fluorophors. As potential alternatives, the environmental friendly fluorescent ultra-small organic-inorganic hybrid metal nanoclusters (size < 2 nm) is a series of powerful competitors used in illuminating field, on account of the non-poisonous, large amount of storage in earth, simple synthetic route, and relative low cost. The most important one, facile regulation of the fluorescence intensity and emission colors makes metal nanoclusters more attractive candidates for illumination application. Here, through ingeniously designing the structures of capping ligands, the highly bright copper nanoclusters are obtained, which further assemble into 2D ribbons with fluorescence quantum efficiency ascending to 36.4%. Last, the light emitting diodes with excellent performance are constructed, the emission wavelength locates at 650 nm in red region, which is suitable for plant illumination.
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Kurdekar, Aditya Dileep, L. A. Avinash Chunduri, C. Sai Manohar, Mohan Kumar Haleyurgirisetty, Indira K. Hewlett et Kamisetti Venkataramaniah. « Streptavidin-conjugated gold nanoclusters as ultrasensitive fluorescent sensors for early diagnosis of HIV infection ». Science Advances 4, no 11 (novembre 2018) : eaar6280. http://dx.doi.org/10.1126/sciadv.aar6280.

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We have engineered streptavidin-labeled fluorescent gold nanoclusters to develop a gold nanocluster immunoassay (GNCIA) for the early and sensitive detection of HIV infection. We performed computational simulations on the mechanism of interaction between the nanoclusters and the streptavidin protein via in silico studies and showed that gold nanoclusters enhance the binding to the protein, by enhancing interaction between the Au atoms and the specific active site residues, compared to other metal nanoclusters. We also evaluated the role of glutathione conjugation in binding to gold nanoclusters with streptavidin. As proof of concept, GNCIA achieved a sensitivity limit of detection of HIV-1 p24 antigen in clinical specimens of 5 pg/ml, with a detection range up to1000 pg/ml in a linear dose-dependent manner. GNCIA demonstrated a threefold higher sensitivity and specificity compared to enzyme-linked immunosorbent assay for the detection of HIV p24 antigen. The specificity of the immunoassay was 100% when tested with plasma samples negative for HIV-1 p24 antigen and positive for viruses such as hepatitis B virus, hepatitis C virus, and dengue. GNCIA could be developed into a universal labeling technology using the relevant capture and detector antibodies for the specific detection of antigens of various pathogens in the future.
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Li, Jingjing, Jun-Jie Zhu et Kai Xu. « Fluorescent metal nanoclusters : From synthesis to applications ». TrAC Trends in Analytical Chemistry 58 (juin 2014) : 90–98. http://dx.doi.org/10.1016/j.trac.2014.02.011.

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Rolband, Lewis, Liam Yourston, Morgan Chandler, Damian Beasock, Leyla Danai, Seraphim Kozlov, Nolan Marshall, Oleg Shevchenko, Alexey V. Krasnoslobodtsev et Kirill A. Afonin. « DNA-Templated Fluorescent Silver Nanoclusters Inhibit Bacterial Growth While Being Non-Toxic to Mammalian Cells ». Molecules 26, no 13 (1 juillet 2021) : 4045. http://dx.doi.org/10.3390/molecules26134045.

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Silver has a long history of antibacterial effectiveness. The combination of atomically precise metal nanoclusters with the field of nucleic acid nanotechnology has given rise to DNA-templated silver nanoclusters (DNA-AgNCs) which can be engineered with reproducible and unique fluorescent properties and antibacterial activity. Furthermore, cytosine-rich single-stranded DNA oligonucleotides designed to fold into hairpin structures improve the stability of AgNCs and additionally modulate their antibacterial properties and the quality of observed fluorescent signals. In this work, we characterize the sequence-specific fluorescence and composition of four representative DNA-AgNCs, compare their corresponding antibacterial effectiveness at different pH, and assess cytotoxicity to several mammalian cell lines.
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Romeo, María V., Elena López-Martínez, Jesús Berganza-Granda, Felipe Goñi-de-Cerio et Aitziber L. Cortajarena. « Biomarker sensing platforms based on fluorescent metal nanoclusters ». Nanoscale Advances 3, no 5 (2021) : 1331–41. http://dx.doi.org/10.1039/d0na00796j.

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Metal nanoclusters and their unique properties are increasing in importance. In this review we acknowledge their application as sensors for biomarkers and the current state in preclinical and clinical uses.
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Ren, Hong-Xin, Min-Xin Mao, Min Li, Cun-Zheng Zhang, Chi-Fang Peng, Jiang-Guo Xu et Xin-Lin Wei. « A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters ». Foods 10, no 6 (24 mai 2021) : 1178. http://dx.doi.org/10.3390/foods10061178.

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In this report, a fluorescent sensing method for paraquat based on gold nanoclusters (AuNCs) is proposed. It was found that paraquat could quench both glutathione-capped AuNCs (GSH-AuNCs) and β-cyclodextrin-modified GSH-AuNCs (GSH/β-CDs-AuNCs). The modification of β-CDs on the surface of GSH-AuNCs obviously enhanced the fluorescence intensity of GSH-AuNCs and improved the sensitivity of paraquat sensing more than 4-fold. This sensibilization was ascribed to the obvious fluorescence intensity enhancement of GSH-AuNCs by β-CDs and the “host–guest” interaction between paraquat and β-CDs. The fluorescence quenching was mainly due to the photoinduced energy transfer (PET) between GSH/β-CDs-AuNCs and paraquat. With the optimized β-CDs modification of the GSH-AuNC surfaces and under buffer conditions, the fluorescent detection for paraquat demonstrated a linear response in the range of 5.0–350 ng/mL with a detection limit of 1.2 ng/mL. The fluorescent method also showed high selectivity toward common pesticides. The interference from metal ions could be easily masked by ethylene diamine tetraacetic acid (EDTA). This method was applied to the measurement of paraquat-spiked water samples and good recoveries (93.6–103.8%) were obtained. The above results indicate that host molecule modification of fluorescent metal NC surfaces has high potential in the development of robust fluorescent sensors.
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Thèses sur le sujet "Fluorescent Metal Nanoclusters"

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Zheng, Jie. « Fluorescent noble metal nanoclusters ». Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-04182005-161511/.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2005.
Wang, Zhong Lin, Committee Member ; Whetten, Robert L., Committee Member ; El-Sayed, Mostafa A., Committee Member ; Dickson, Robert M., Committee Chair ; Lyon, Andrew L., Committee Member.
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Antoku, Yasuko. « Fluorescent Polycytosine-Encapsulated Silver Nanoclusters ». Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14568.

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Small silver nanoclusters are synthesized using polycytosines as matrices. Different size silver nanoclusters ranging from Ag1 to Ag7 exhibit bright emission maxima at blue (480nm), green (525nm), red (650nm), and IR (720nm) wavelengths with varying the excitation wavelengths. With electrophoresis, correlation of emission with mass spectra, the Ag cluster sizes are identified with blue emitters as Ag5, green emitters as Ag4, red emitters as Ag3, and IR emitters as Ag2. Ag4 and Ag5 appear to be partially oxidized while Ag2 and Ag3 are likely fully reduced. Silver cluster stability and their dynamics are observed from silver clusters encapsulated by polycytosine (Cm:Agn). From length study of polycytosine, the longer the polycytosine is, the more stable the larger clusters such as Ag5 are. In time-dependent optical measurements, isosbestic points are observed from Cm:Agn by converting red and IR species into blue and green species, while in the case of temperature-dependent optical properties, with increasing temperature, the blue (oxidized Ag5) and green (oxidized Ag4) emitters convert into the red (Ag3) and IR (Ag2) emitters. NaCl-dependent optical measurements support the assignments of oxidized and fully reduced silver emitters. Circular dichroism (CD) is used to investigate conformational changes in Cm and Cm:Agn with varying conditions (time, temperature and NaCl) and the studies indicate that no conformational changes in Cm:Agn are observed from the time and temperature, while the conformational changes in Cm:Agn are observed from the NaCl studies. From pH-dependent emission study of Cm:Agn, the silver nanocluster dynamics slow down at high pH. Using confocal microscopy technique, single molecules on IR species, C12:Ag2 are investigated and demonstrate that C12:Ag2 is brighter and more photostable than Cy5 which is known to be one of the best IR dyes. With low excitation power, molecules can be monitored for hours, giving bright blinking free, stable fluorescence. The photophysics of this new dye make it a promising candidate for single molecule studies in biological applications.
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Antoku, Yasuko. « Fluorescent polyctosine-encapsulated silver nanoclusters ». Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-02152007-084843/.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2007.
Dickson, Robert, Committee Chair ; Barry, Bridgette, Committee Member ; Fahrni, Christoph, Committee Member ; Fernandez, Facundo, Committee Member ; Srinivasarao, Mohan, Committee Member.
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Patel, Sandeep A. « Photophysics of fluorescent silver nanoclusters ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28110.

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Thesis (M. S.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009.
Committee Chair: Dickson, Robert; Committee Member: Brown, Ken; Committee Member: Curtis, Jennifer; Committee Member: Payne, Christine; Committee Member: Perry, Joseph.
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Chen, Wei-Yu, et 陳威宇. « Synthesis and Applications of Fluorescent Noble Metal Nanoclusters ». Thesis, 2014. http://ndltd.ncl.edu.tw/handle/35529139924630336284.

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博士
國立臺灣大學
化學研究所
103
Fluorescent noble metal nanoclusters (NCs) and nanodots (NDs) are interesting materials and widely employed in the biosensing and bioimaging, mainly because of their unique optical and catalytic properties, including strong fluorescence, size-dependent emission wavelengths, magnetism, and high photostability. This thesis focuses on the preparation, characterization, and application of water-soluble fluorescent noble metallic nanoclusters/nanodots (NCs/NDs). First, we have employed cytosine-rich oligonucleotides to prepare strongly fluorescent and highly photostable DNA-templated gold/silver nanoclusters (DNA–Au/Ag NCs) through the NaBH4-mediated reduction method. Electrospray ionization-mass spectrometry (ESI-MS) and inductively coupled plasma mass spectrometry (ICP-MS) were employed to characterize the DNA–Au/Ag NCs, revealing that each DNA–Au/Ag NCs contain two Au atoms and one Ag atom. Based on that fact that sulfide (S2−) ion-induced fluorescence quenching of DNA–Au/Ag NCs, we further developed a fluorescence turn-off assay for the high sensitive detection of S2− ions at concentrations as low as 0.83 nM. For preparation the functional Au NDs, we combined the biocompatible liposomes (Lip) and fluorescent 11-mercaptoundecanoic acid–gold nanodots (11-MUA–Au NDs) to prepare the 11-MUA–Au ND/Lip hybrids by incorporation of gold nanoparticles (∼3 nm) and 11-MUA molecules in hydrophobic phospholipid membranes that self-assemble to form small unilamellar vesicles. A simple and homogeneous fluorescence assay for phospholipase C (PLC) was developed on the basis of the fluorescence quenching of 11-MUA–Au ND/Lip hybrids in aqueous solution. The fluorescence of the 11-MUA–Au ND/Lip hybrids is quenched by oxygen (O2) molecules in solution, and quenching is reduced in the presence of PLC. PLC catalyzes the hydrolysis of phosphatidylcholine units from Lip to yield diacylglycerol (DAG) and phosphocholine (PC) products, leading to the decomposition of Lip. The diacylglycerol further interacts with 11-MUA–Au NDs via hydrophobic interactions, leading to inhibition of O2 quenching. The 11-MUA–Au ND/Lip probe provides a limit of detection of 0.21 nM for PLC, with high selectivity over other proteins, enzymes, and phospholipases. For preparation of self-assembly Au NDs, hybridized ligands were used to etching and stabilization of gold nanoparticles (~3 nm). These NDs were employed to detect nitrite based on analyte-induced photoluminescence (PL) quenching. 11-Mercaptoundecanol (11-MU) and its complexes with amphiphilic ligands (ALs) etch Au nanoparticles through hydrophobic interactions and form a densely packed ligand shell on the surface of each core in the as-formed Au NDs. We tested such ALs as three fatty acids and three quaternary ammonium surfactants with alkyl chain lengths of 10–16 carbons. The results show that chain length, ligand density, and functional group (charge) of ALs play important roles in determining the optical properties of Au NDs. Tetradecanoic acid (TA)/11-MU–Au NDs are highly dispersible in aqueous solution and allow detection of nitrite down to 40 nM with selectivities (>100-fold) greater than that for common ions present in natural (lake and sea) water samples. We further prepared antimicrobial Au NDs which surfaces were co-immobilized with antibacterial peptide (surfactin; SFT) and 1-dodecanethiol (DT). SFT, a cyclic lipopeptide, has been credited with antibacterial, antiviral, antifungal, anti-mycoplasma and hemolytic activities. The hybrid SFT/DT-capped Au NDs (SFT/DT-Au NDs) were prepared through the self-assembly of antimicrobial peptides (SFT) on DT-anchored Au NDs by the nonspecific hydrophobic interactions between the alkyl chains of the SFT and the DT molecules. Relative to SFT and DT-Au NDs, SFT/DT-Au NDs possessed superior antimicrobial activity toward non-multi-drug resistant (non-MDR) Escherichia coli (E. coli), Proteus vulgaris (P. vulgaris), Proteus vulgaris (P. vulgaris), Salmonella enterica serovar Enteritidis (S. enteritidis), and Staphylococcus aureus (S. aureus) bacteria as well as the multi-drug resistant (MDR) bacteria, methicillin-resistant S. aureus (MRSA). We demonstrated the water solubility, PL as well as antibacterial activity of Au NDs were highly dependent on the ligand ratio of SFT/DT on Au NDs. In vitro haemolysis and cytotoxicity analyses of SFT/DT-Au NDs have revealed their insignificant haemolysis in red blood cells (RBCs) and low toxicity in selected cell lines.
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Wu, Yun-Tse, et 吳昀澤. « Template-assisted Synthesis of Metal Nanoclusters and their Application as a Fluorescent Sensor ». Thesis, 2016. http://ndltd.ncl.edu.tw/handle/44993279935039299105.

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碩士
國立中山大學
化學系研究所
104
This study utilized templates to support the synthesis of gold nanoclusters. Having the advantages of high performance on fluorescence, longer fluorescence lifetime, and good biocompatibility, it is suitable for us to use this kind of materials to design biosensors. After templates modified, we could get a better detection results by a mothods of ratiometric fluorescence sensing system, and we apply this probe for biochemistry detection and cellular imaging on the first study. Besides, addition silver nitrate to gold nanoclusters gave the generation of bimetallic alloy nanoclusters. With the properties entirely changed, we designed a brand new sensing system for nucleotides detection on the second study. (A) Gold Nanoclusters-Based Fluorescent Probe for Simultaneous Sensing of pH and Temperature and Its Application to Cellular Imaging and Logic Gates This study describes the synthesis of a dual emission probe, FITC/BSA-AuNCs, for the fluorescent ratiometric sensing of temperature and pH change. Green-emitting fluorescein-5-isothiocyanate (FITC) was labeled on bovine serum albumin (BSA) by conjugating the isothiocyanate groups to the amino groups. This FITC-capped BSA acted as a template for the synthesis of red-emitting gold nanoclusters (AuNCs) under alkaline conditions. As a result, FITC/BSA-AuNCs could emit dual fluorescence at 525 and 670 nm at single wavelength excitation, which are sensitive to the pH and temperature change, respectively. The temperature-dependent fluorescence of the AuNCs enabled FITC/BSA-AuNCs to ratiometrically detect the temperature change with the resolution better than 1.5 ℃ as the FITC was used as an internal standard. Meanwhile, the pH-induced fluorescence change of FITC enabled to ratiometrically probe the pH change with the resolution of 0.5-pH unit as the fluorescence of the AuNCs remained almost constant under identical conditions. Based on this concept, this study firstly developed AuNC-based probe for simultaneous detection of pH and temperature change with a linear range from pH 6.0–8.0 and from 21 ℃–41 ℃, respectively. Since trypsin can digest BSA to peptide fragments, a dramatically decreased in the fluorescence intensity at 670 nm of FITC/BSA-AuNCs was observed in the presence of increasing the logarithmic concentration of trypsin. This finding enable us to ratiometrically detect trypsin with a detection limit of 131 pg/mL and a linear range of 10-8 to 10-4 g/mL. The successful quantification of trypsin in human urine demonstrated that FITC/BSA-AuNCs is capable of sensing trypsin in complex matrix. Three-input AND logic gates were then designed by using temperature, pH, and trypsin as inputs. Finally, the practicality of utilizing FITC/BSA-AuNCs to determine temperature and pH changes in HeLa cells is also achieved. (B) Synthesis of DNA-templated bimetallic nanoclusters for fluorescent sensing of target nucleic acid by shift in maximum emission wavelength Under UV light irradiation and heating, we develop a simple, nontoxic, and facile way to synthesize gold nanoclusters and bimetallic nanoclusters (A30-AuAgNCs) by using poly adenosine as the templates. The synthesis steps were divided into two parts: First, we put poly adenosine, HAuCl4 and citrate buffer together to serve as a precursor. After 24-h UV light irradiation, a fluorescent gold nanoclusters were generated, and name as A30-AuNCs. Under 290 nm excitation light, A30-AuNCs could emit 480 nm emission light. Next, we add silver nitrate into this gold nanoclusters, and then put it into 90 ℃ oven for incubation. After 2 hours, the final product A30-AuAgNCs was generated. Take the advantage of this method, the emission wavelength of this bimetallic nanoclusters could entirely red shift 70 nm against A30-AuNCs, which is more suitable for biochemical sensing. The production of A30-AuAgNCs could well confirm by transmission electron microscope (TEM), The generation of silver atoms was also validated by inductively coupled plasma mass spectrometry (ICP-MS) and X-ray Photoelectron Spectrometer (XPS), the element ratio of gold and silver was 4:1. After understanding the fluorescence reversibility of salt effect from A30-AuAgNCs, we recommended that the silver atoms may surround the golden core. Since the theoretical calculation of A30-AuAgNCs fluorescence from Jellium model indicates the result of Au8, we infer the structure of A30-AuAgNCs should be Au8Ag2. Moreover, this nucleotide-templates bimetallic nanoclusters could show the ability of sensing target-DNA (tDNA) by changing the A30 to pDNA, which is consisted with A30 and a additional recognition part. As the concentration of pDNA rise, the pDNA-AuAgNCs fluorescence wavelength become smaller (blue shift). The linear range of quantification is 0.25~2 μM.
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Tsai, Peiying, et 蔡沛穎. « Toward The Effect Of Interaction Between Metal Nanoclusters And Organic Dyes On Fluorescence ». Thesis, 2012. http://ndltd.ncl.edu.tw/handle/35810768892228604551.

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碩士
義守大學
生物技術與化學工程研究所
100
Metal nanoclusters (NCs) have attracted a great deal of attention because of their promising applications in optoelectronics, catalysis, biological sciences, and sensing. Considerable research has focused on different strategies for effectively producing fluorescent metal nanoclusters. In the top-down approaches, colloidal nanoparticles (NPs) have been synthesized first, and then etched by chemical compounds to form NCs. Alternatively, the bottom-up methods, in which metal cations were reduced with the presence of different stabilizing ligands. A facile bottom-up process for producing fluorescent gold nanoclusters (AuNCs) was revealed in this study. The formation of AuNCs was confirmed by TEM. Two blue and one green fluorescent bands were developed on a TLC plate. The quantum yield of the crude product was determined to be 31.4%. However, with a similar process, but free of gold salt reactant, a blue fluorescent band was also observed. We thus conclude that AuNCs and organic dyes were simultaneously formed in this process for AuNCs production. A silica gel chromatography was employed to separate the crude products into four fractions, with quantum yields of 0%, 23.5% (strong blue fluorescence), 14.7% (weak blue fluorescence), and 3.7% (green fluorescence).The crude mixture exhibited the highest quantum yield, compared with those of isolated fractions, suggesting a fluorescence enhancement caused by the interaction between AuNCs and organic dyes.
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Kuppan, Balamurugan. « Self-assembly of Luminescent Metal Nanoclusters, Supramolecular Bile salt based Gels and their Soft Nanocomposites ». Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5421.

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Chapitres de livres sur le sujet "Fluorescent Metal Nanoclusters"

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Xu, Jie, et Li Shang. « Fluorescent Metal Nanoclusters for Bioimaging ». Dans Fluorescent Materials for Cell Imaging, 97–128. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5062-1_5.

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Bothra, Shilpa, et Suban K. Sahoo. « Atomically Precise Fluorescent Metal Nanoclusters as Sensory Probes for Metal Ions ». Dans Emerging Trends in Advanced Spectroscopy, 165–87. New York : River Publishers, 2022. http://dx.doi.org/10.1201/9781003338093-18.

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Bothra, Shilpa, et Suban K. Sahoo. « Atomically precise fluorescent metal nanoclusters ». Dans Sensing and Biosensing with Optically Active Nanomaterials, 207–42. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-323-90244-1.00013-6.

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María José Santillán, Jesica, David Muñetón Arboleda, Valeria Beatriz Arce, Lucía Beatriz Scaffardi et Daniel Carlos Schinca. « A Simple and “Green” Technique to Synthesize Metal Nanocolloids by Ultrashort Light Pulses ». Dans Colloids - Types, Preparation and Applications [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94750.

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In this chapter Ag, Ni and Fe nanocolloids synthesized by “green” ultrashort pulse laser ablation of solid metal targets using different pulse energies and liquid media are characterized by different techniques. Optical extinction spectroscopy (OES), micro-Raman spectroscopy (MRS), transmission electron microscopy (TEM) and electron diffraction (ED) were independently used to analyze optical, morphological and compositional properties of the generated nanocolloids. In a deeper way, the stability characteristics of Ag nanocolloids in aqueous solutions with different stabilizers were studied owing to their potential use in biocompatible compounds. Besides, due to their interesting applications, few atoms Ag nanoclusters (NCs) were synthesized using the same ablation technique, analyzing their fluorescent and photocatalytic properties. On the other hand, to expand the characterization of the nanocolloids, their magnetic behavior was inspected for the Ni and Fe by vibrating sample magnetometry (VSM).
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Actes de conférences sur le sujet "Fluorescent Metal Nanoclusters"

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Baba, Tsutomu, Hidekazu Ishitobi, Kyoko Masui et Yasushi Inouye. « Synthesis and evaluation of fluorescent palladium nanoclusters ». Dans 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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Yuan, Xun, Zhentao Luo, Jim Yang Lee et Jianping Xie. « Synthesis of Highly Fluorescent and Monodisperse Metal Nanoclusters ». Dans 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore : Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_666.

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Vogel, M., S. Matys, K. Pollmann et J. Raff. « P4.08 - Detection of metal ions using fluorescent gold nanoclusters ». Dans 13. Dresdner Sensor-Symposium 2017. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2017. http://dx.doi.org/10.5162/13dss2017/p4.08.

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Ai, Lin, et Hong Meng. « Full Color Emission of Fluorescent Metal Nanoclusters Regulated by Doping Heteroatom ». Dans 2020 International Conference on Artificial Intelligence and Electromechanical Automation (AIEA). IEEE, 2020. http://dx.doi.org/10.1109/aiea51086.2020.00129.

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Perry, Karima J., Paul Roberts, Richard T. Agans, Saber M. Hussain, Shashi P. Karna et Raj K. Gupta. « Protein-Templated Fluorescent Metal Nanoclusters as Photonic Pressure Sensors for Neuronal Cells ». Dans 2022 IEEE 22nd International Conference on Nanotechnology (NANO). IEEE, 2022. http://dx.doi.org/10.1109/nano54668.2022.9928622.

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Yeh, Hsin-Chih, Jaswinder Sharma, Hyojong Yoo, Jennifer S. Martinez et James H. Werner. « Photophysical characterization of fluorescent metal nanoclusters synthesized using oligonucleotides, proteins and small molecule ligands ». Dans BiOS, sous la direction de Samuel Achilefu et Ramesh Raghavachari. SPIE, 2010. http://dx.doi.org/10.1117/12.842192.

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Burratti, L., E. Ciotta, E. Bolli, M. Casalboni, F. De Matteis, R. Francini, S. Casciardi et P. Prosposito. « Synthesis of fluorescent silver nanoclusters with potential application for heavy metal ions detection in water ». Dans 15th International Conference on Concentrator Photovoltaic Systems (CPV-15). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5123568.

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