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NIR QDs

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https://www.readbyqxmd.com/read/30325545/near-infrared-luminescent-ternary-ag3sbs3-quantum-dots-by-in-situ-conversion-of-ag-nanocrystals-with-sb-c9h19coos-3
#1
Jiatao Zhang, Qiumei Di, Juwen Wang, Zhengjing Zhao, Jiajia Liu, Meng Xu, Jia Liu, Hongpan Rong, Wenxing Chen
Different from three single precursors producing colloidal ternary quantum dots (QDs), ternary Ag3SbS3 quantum dots (QDs) with efficient near-infrared (NIR) luminescence have been prepared by a new facile in-situ conversion of Ag nanocrystals (NCs) with binary Sb/S organic precursor Sb(C9H19COOS)3 under low temperature. The unprecedented construction evolution from Ag NCs to Ag3SbS3/Ag hetero-structure and final monodisperse Ag3SbS3 QDs have been demonstrated. These novel Ag3SbS3 QDs exhibit efficient NIR emission at ~1263 nm and possess high colloidal stability...
October 16, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/30235806/a-semimetal-like-molybdenum-carbide-quantum-dots-photoacoustic-imaging-and-photothermal-agent-with-high-photothermal-conversion-efficiency
#2
Wenhao Dai, Haifeng Dong, Xueji Zhang
Theranostic platforms integrating imaging diagnostic and therapeutic interventions into a single nanoplatform have attracted considerable attention for cancer-individualized therapies. However, their uncertain stability, complex pharmacokinetics, and intrinsic toxicology of multiple components hinder their practical application in clinical research. In this paper, stable and high-concentration molybdenum carbide quantum dots (Mo₂C QDs) with a diameter of approximately 6 nm and a topographic height of about 1...
September 19, 2018: Materials
https://www.readbyqxmd.com/read/30083261/self-assembled-dual-fluorescence-nanoparticles-for-cd44-targeted-delivery-of-anti-mir-27a-in-liver-cancer-theranostics
#3
Xiao Zheng, Fan Zhang, Yawei Zhao, Jing Zhang, Jianati Dawulieti, Yue Pan, Lianzhi Cui, Madi Sun, Dan Shao, Mingqiang Li, Kan He, Ming Zhang, Jing Li, Li Chen
Despite the vital role miRNA-27a plays in driving the development and progress of liver cancer, miRNA-based inhibition therapy is hampered due to its undesired degradation and off-target effects. Herein, a multifunctional nanoparticle for noninvasive tracking of targeted delivery of anti-miR-27a oligonucleotides against liver cancer was constructed. Methods: Dual-fluorescent conjugates (QD-HA-PEI) were first fabricated through crosslinking hyaluronic acid (HA), polyethyleneimine (PEI) and near-infrared (NIR) fluorescent quantum dots (QDs) via a facile one-pot approach...
2018: Theranostics
https://www.readbyqxmd.com/read/30001113/near-infrared-light-excited-and-localized-surface-plasmon-resonance-enhanced-photoelectrochemical-biosensing-platform-for-cell-analysis
#4
Ruyan Li, Wenwen Tu, Huaisheng Wang, Zhihui Dai
Under near-infrared (NIR) light of 810 nm wavelength for irradiation, a very simple and highly sensitive photoelectrochemical (PEC) biosensing platform has been established using the localized surface plasmon resonance effect of Au nanoparticles (NPs) as signal amplification for the nondestructive analysis of living cells. The water-dispersible Ag2 S quantum dots (QDs) synthesized by a one pot method were employed as photoelectrochemically active species, and they exhibited excellent PEC properties irradiated with NIR light which was chosen due to the obvious absorption and fluorescent emission in the NIR light region...
August 7, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29999078/long-lived-luminescence-of-colloidal-silicon-quantum-dots-for-time-gated-fluorescence-imaging-in-the-second-near-infrared-window-in-biological-tissue
#5
Makoto Sakiyama, Hiroshi Sugimoto, Minoru Fujii
Boron (B) and phosphorus (P) codoped silicon quantum dots (Si QDs) are dispersible in polar solvents without organic ligands and exhibit photoluminescence (PL) in the first (NIR-I) and second (NIR-II) near infrared (NIR) windows in biological tissues due to the optical transition from the donor to acceptor states. We studied the relationship between the PL wavelength, lifetime and quantum yield (QY) of the colloidal solution and the composition of the starting material for the preparation. We found that the PL lifetime and the QY are primarily determined by the composition, while the PL wavelength is mainly determined by the growth temperature...
August 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/29992458/a-novel-fluorescent-nanoparticle-for-sensitive-detection-of-cry1ab-protein-in-vitro-and-in-vivo
#6
Xiao Xu, Hao Chen, Yuancheng Cao, Yongjun Lin, Jun'an Liu
Here, we report the synthesis and characterization of CoFe2 O4 doping Ag2 S dendrimer-modified nanoparticles (CoFe2 O4 -Ag2 S DMNs) in Cry1Ab protein detection and imaging. The near-infrared Ag2 S quantum dots were first prepared by using the thermal decomposition method, followed by modification of the water-soluble quantum dots using the method of solvent evaporation and ligand exchange, and finally the fluorescent magnetic bifunctional nanoparticles were obtained by binding with CoFe2 O4 . As-prepared CoFe2 O4 -Ag2 S DMNs were characterized by fluorescence (FL) spectroscopy and transmission electron microscopy (TEM)...
July 10, 2018: Journal of Fluorescence
https://www.readbyqxmd.com/read/29878530/recent-advance-in-near-infrared-active-lead-chalcogenide-quantum-dots-preparation-post-synthesis-ligand-exchange-and-applications-in-solar-cells
#7
Aabhash Shrestha, Munkhbayar Batmunkh, Antonio Tricoli, Sheng Dai, Shi Zhang Qiao
Quantum dots (QDs) of lead chacogenides (e.g. PbS, PbSe and PbTe) are attractive near-infrared (NIR) active materials that show great potential in a wide range of applications such as photovoltaics (PV), optoelectronics, sensors, bio-electronics and many others. The successful utilization of these functional materials requires deep understanding of their synthesis, properties and material modification process. The surface ligand plays an essential role in the production of QDs, post-synthesis modification and their integration to practical applications...
June 7, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29862824/surface-engineering-of-quantum-dots-for-remarkably-high-detectivity-photodetectors
#8
Ting Shen, Bo Li, Kaibo Zheng, Tönu Pullerits, Guozhong Cao, Jianjun Tian
Ternary alloyed CdSe x Te1- x colloidal QDs trap-passivated by iodide-based ligands (TBAI) are developed as building blocks for UV-NIR photodetectors. Both the few surface traps and high loading of QDs are obtained by in situ ligand exchange with TBAI. The device is sensitive to a broad wavelength range covering the UV-NIR region (300-850 nm), showing an excellent photoresponsivity of 53 mA/W, a fast response time of ≪0.02s, and remarkably high detectivity values of 8 × 1013 Jones at 450 nm and 1 × 1013 Jones at 800 nm without an external bias voltage...
June 21, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29845127/gd-dtpa-coupled-ag-2-se-quantum-dots-for-dual-modality-magnetic-resonance-imaging-and-fluorescence-imaging-in-the-second-near-infrared-window
#9
Jiao-Jiao Ma, Ming-Xia Yu, Zheng Zhang, Wei-Guo Cai, Zhi-Ling Zhang, Hui-Li Zhu, Qing-Yuan Cheng, Zhi-Quan Tian, Dai-Wen Pang
Near-infrared (NIR) fluorescent quantum dots (QDs) are ideal platforms to fabricate multifunctional contrast agents for multimodal imaging. Herein, second near-infrared window fluorescent (NIR-II) Ag2Se QDs were coupled with gadopentetate dimeglumine injection (Gd-DTPA) for dual-modality T1-weighted magnetic resonance (MR) imaging and fluorescence imaging. In vitro experiments suggested that the prepared Ag2Se-Gd QDs exhibit low cytotoxicity, remarkable T1-weighted MR imaging, and fluorescence imaging contrast properties...
June 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/29767202/achieving-deep-red-to-near-infrared-emissions-in-sn-doped-cu-in-s-zns-quantum-dots-for-red-enhanced-white-leds-and-near-infrared-leds
#10
Jixin Chen, Ye Li, Le Wang, Tianliang Zhou, Rong-Jun Xie
Semiconductor quantum dots (QDs) are promising luminescent materials for use in lighting, display and bio-imaging, and the color tuning is a necessity for such applications. In this work, we report tunable colors and deep-red or near infrared (NIR) emissions in Cu-In-S and Cu-In-S/ZnS QDs by incorporating Sn. These QDs (with a size of 5 nm) with varying Sn concentrations and/or Cu/In ratios were synthesized by a non-injection method, and characterized by a variety of analytical techniques (i.e., XRD, TEM, XPS, absorption, photoluminescence, decay time, etc...
May 24, 2018: Nanoscale
https://www.readbyqxmd.com/read/29573571/mos-2-quantum-dots-tio-2-nanotube-arrays-an-extended-spectrum-driven-photocatalyst-for-solar-hydrogen-evolution
#11
Qun Wang, Jianying Huang, Hongtao Sun, Yun Hau Ng, Ke-Qin Zhang, Yuekun Lai
TiO2 nanotube arrays (TiO2 NTAs) decorated with molybdenum disulfide quantum dots (MoS2 QDs) were synthesized by a facile electrodeposition method and used as a composite photocatalyst. MoS2 QDs/TiO2 NTAs showed enhanced photocatalytic activity compared with pristine TiO2 NTAs for solar light-promoted H2 evolution without adding any sacrificial agents or cocatalysts. The photocatalytic activity was influenced by the amount of MoS2 QDs coated on TiO2 NTAs. The optimal composition showed excellent photocatalytic activity, achieving H2 evolution rates of 31...
May 25, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29517226/recombinant-protein-luciferase-igg-binding-domain-conjugated-quantum-dots-for-bret-coupled-near-infrared-imaging-of-epidermal-growth-factor-receptors
#12
Setsuko Tsuboi, Takashi Jin
For the highly sensitive near-infrared (NIR) optical detection of epidermal growth factor receptors (EGFRs) expressed on cancer cells, bioluminescence resonance energy transfer (BRET) coupled NIR quantum dots (QDs) are prepared by direct conjugation of his-tagged Renilla luciferase (RLuc) recombinant protein (HisRLuc·GB1) to glutathione-coated CdSeTe/CdS QDs (GSH-QDs). The recombinant protein has two functional groups consisting of a luciferase enzyme and an immunoglobulin binding domain (GB1) of protein G...
April 18, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29501065/near-infrared-quantum-dots-labelled-with-a-tumor-selective-tetrabranched-peptide-for-in-vivo-imaging
#13
Jlenia Brunetti, Giulia Riolo, Mariangela Gentile, Andrea Bernini, Eugenio Paccagnini, Chiara Falciani, Luisa Lozzi, Silvia Scali, Lorenzo Depau, Alessandro Pini, Pietro Lupetti, Luisa Bracci
BACKGROUND: Near-infrared quantum dots (NIR QDs) are a new class of fluorescent labels with excellent bioimaging features, such as high fluorescence intensity, good fluorescence stability, sufficient electron density, and strong tissue-penetrating ability. For all such features, NIR QDs have great potential for early cancer diagnosis, in vivo tumor imaging and high resolution electron microscopy studies on cancer cells. RESULTS: In the present study we constructed NIR QDs functionalized with the NT4 cancer-selective tetrabranched peptides (NT4-QDs)...
March 3, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29487699/molecular-imaging-of-toll-like-receptor-4-detects-ischemia-reperfusion-injury-during-intussusception
#14
Zhang-Chun Hu, Ya-Lan Tan, Shun-Gen Huang, Peng Pan, Xiao-Bo Liu, Jian Wang, Wan-Liang Guo
We investigated the expression of Toll-like receptor 4 (TLR4) in the acute phase of intestinal I/R injury during intussusception and evaluated whether anti-TLR4 antibody-conjugated lead sulfide quantum dots (TLR4-PbS QDs) could be used to detect and monitor the injury. We first established a mouse model of I/R injury during intussusception. TLR-PbS QDs were then intravenously administered to intestinal I/R injured mice and visualized using whole-body fluorescence imaging in the second near-infrared window (NIR-II)...
January 30, 2018: Oncotarget
https://www.readbyqxmd.com/read/29442892/facile-synthesis-of-near-infrared-emissive-cds-quantum-dots-for-live-cells-imaging
#15
Yanyan Cui, Chunfang Zhang, Li Song, Jian Yang, Zhongbo Hu, Xiangfeng Liu
CdS quantum dots (QDs) have attracted extensive attention owing to their great potential in optoelectronic nanodevices and biosensors. But their poor water solubility and high cytotoxicity restrict their practical application in live cell imaging. In addition, CdS QDs usually emit blue or green fluorescence, which also have some limitations for cell imaging due to the "water window" effect. In this study, we report a novel strategy to directly synthesize water-soluble and low-cytotoxic CdS QDs with near infrared (NIR) fluorescence through confinement into BSA templates with the mediation of L-cysteine (Cys)...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29381064/caged-molecular-glues-as-photoactivatable-tags-for-nuclear-translocation-of-guests-in-living-cells
#16
Akio Arisaka, Rina Mogaki, Kou Okuro, Takuzo Aida
We developed dendritic caged molecular glues (Caged Glue-R) as tags for nucleus-targeted drug delivery, whose multiple guanidinium ion (Gu+ ) pendants are protected by an anionic photocleavable unit (butyrate-substituted nitroveratryloxycarbonyl; BA NVOC). Negatively charged Caged Glue-R hardly binds to anionic biomolecules because of their electrostatic repulsion. However, upon exposure of Caged Glue-R to UV light or near-infrared (NIR) light, the BA NVOC groups of Caged Glue-R are rapidly detached to yield an uncaged molecular glue (Uncaged Glue-R) that carries multiple Gu+ pendants...
February 21, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29377531/ultrasmall-pb-ag-2-s-quantum-dots-with-uniform-particle-size-and-bright-tunable-fluorescence-in-the-nir-ii-window
#17
He He, Yi Lin, Zhi-Quan Tian, Dong-Liang Zhu, Zhi-Ling Zhang, Dai-Wen Pang
Ag2 S quantum dots (QDs) are well-known near-infrared fluorophores and have attracted great interest in biomedical labeling and imaging in the past years. However, their photoluminescence efficiency is hard to compete with Cd-, Pb-based QDs. The high Ag+ mobility in Ag2 S crystal, which causes plenty of cation deficiency and crystal defects, may be responsible mainly for the low photoluminescence quantum yield (PLQY) of Ag2 S QDs. Herein, a cation-doping strategy is presented via introducing a certain dosage of transition metal Pb2+ ions into Ag2 S nanocrystals to mitigate this intrinsic shortcoming...
March 2018: Small
https://www.readbyqxmd.com/read/29260851/structure-property-relations-in-giant-semiconductor-nanocrystals-opportunities-in-photonics-and-electronics
#18
Fabiola Navarro-Pardo, Haiguang Zhao, Zhiming M Wang, Federico Rosei
Semiconductor nanocrystals exhibit size-tunable absorption and emission ranging from the ultraviolet (UV) to the near-infrared (NIR) spectral range, high absorption coefficient, and high photoluminescence quantum yield. Effective surface passivation of these so-called quantum dots (QDs) may be achieved by growing a shell of another semiconductor material. The resulting core/shell QDs can be considered as a model system to study and optimize structure/property relations. A special case consists in growing thick shells (1...
March 20, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29148805/near-infrared-quantum-dot-emission-enhanced-by-stabilized-self-assembled-j-aggregate-antennas
#19
Francesca S Freyria, José M Cordero, Justin R Caram, Sandra Doria, Amro Dodin, Yue Chen, Adam P Willard, Moungi G Bawendi
Enhancing photoluminescent emission (PL) in the near-infrared-infrared (NIR-IR) spectral region has broad applications from solar energy conversion to biological imaging. We show that self-assembled molecular dye J-aggregates (light-harvesting nanotubes, LHNs) can increase the PL emission of NIR PbS quantum dots (QDs) in both liquid and solid media more than 8-fold, promoted primarily by a long-range antenna effect and efficient Förster resonance energy transfer (FRET) from donor to acceptor. To create this composite material and preserve the optical properties of the nanocrystals, we performed an in situ ligand substitution followed by a functionalization reaction using click-chemistry...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148709/nir-emitting-nanoprobes-based-on-cyclic-rgd-motif-conjugated-pbs-quantum-dots-for-integrin-targeted-optical-bioimaging
#20
N Depalo, M Corricelli, I De Paola, G Valente, R M Iacobazzi, E Altamura, D Debellis, D Comegna, E Fanizza, N Denora, V Laquintana, F Mavelli, M Striccoli, M Saviano, A Agostiano, A Del Gatto, L Zaccaro, M L Curri
Here, silica-coated PbS quantum dots (QDs) with photoluminescence emission properties in the near-infrared (NIR) region are proposed as potential effective single particle optical nanoprobes for future in vivo imaging of tumors. The dispersibility in aqueous medium of hydrophobic PbS QDs was accomplished by growing a silica shell on their surface by exploiting a base assisted water-in-oil microemulsion method. The silica-coated PbS QDs were then conjugated with a specifically designed cyclic arginine-glycine-aspartic acid (cRGD) peptide that is able to specifically recognize αvβ3 integrins, which are overexpressed in angiogenic tumor-induced vasculatures and on some solid tumors, to achieve tumor-specific targeting...
December 13, 2017: ACS Applied Materials & Interfaces
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