keyword
https://read.qxmd.com/read/37834483/acceleration-of-near-ir-emission-through-efficient-surface-passivation-in-cd-3-p-2-quantum-dots
#21
JOURNAL ARTICLE
Logan Smith, K Elena Harbison, Benjamin T Diroll, Igor Fedin
Fast near-IR (NIR) emitters are highly valuable in telecommunications and biological imaging. The most established NIR emitters are epitaxially grown Inx Ga1-x As quantum dots (QDs), but epitaxial growth has several disadvantages. Colloidal synthesis is a viable alternative that produces a few NIR-emitting materials, but they suffer from long photoluminescence (PL) times. These long PL times are intrinsic in some NIR materials (PbS, PbSe) but are attributed to emission from bright trapped carrier states in others...
September 22, 2023: Materials
https://read.qxmd.com/read/37831785/acid-resistant-near-infrared-ii-ag-2-se-quantum-dots-for-gastrointestinal-imaging
#22
JOURNAL ARTICLE
Ling-Ling Yang, Wei Zhao, Zhen-Ya Liu, Mengtian Ren, Juan Kong, Xia Zong, Meng-Yao Luo, Bo Tang, Jiahongyi Xie, Dai-Wen Pang, An-An Liu
With the development of near-infrared II (NIR-II) fluorescence imaging, Ag2 Se quantum dots (QDs) have become promising label candidates due to their negligible toxicity and narrow band gap. Despite their potential for gastrointestinal (GI) imaging, the application of Ag2 Se QDs still presents significant challenges due to issues such as fluorescence extinction or poor stability in the complex digestive microenvironment. Herein, we have proposed a novel approach to the continuous production of Se precursors using glutathione (GSH) as the reductant under acidic conditions, realizing the continuous growth of water-dispersible Ag2 Se QDs...
October 24, 2023: Analytical Chemistry
https://read.qxmd.com/read/37721358/silicon-nanomembrane-based-broadband-synaptic-phototransistors-for-neuromorphic-vision
#23
JOURNAL ARTICLE
Yue Wang, Lei Yin, Shijie Huang, Rulei Xiao, Yiqiang Zhang, Dongke Li, Xiaodong Pi, Deren Yang
Neuromorphic vision has been attracting much attention due to its advantages over conventional machine vision (e.g., lower data redundancy and lower power consumption). Here we develop synaptic phototransistors based on the silicon nanomembrane (Si NM), which are coupled with lead sulfide quantum dots (PbS QDs) and poly(3-hexylthiophene) (P3HT) to form a heterostructure with distinct photogating. Synaptic phototransistors with optical stimulation have outstanding synaptic functionalities ranging from ultraviolet (UV) to near-infrared (NIR)...
September 18, 2023: Nano Letters
https://read.qxmd.com/read/37705785/optical-properties-of-nir-photoluminescent-pbs-nanocrystal-based-three-dimensional-networks
#24
JOURNAL ARTICLE
Denis Pluta, Henning Kuper, Rebecca T Graf, Christoph Wesemann, Pascal Rusch, Joerg August Becker, Nadja C Bigall
The assembly of nanocrystals (NCs) into three-dimensional network structures is a recently established strategy to produce macroscopic materials with nanoscopic properties. These networks can be formed by the controlled destabilization of NC colloids and subsequent supercritical drying to obtain NC-based aerogels. Even though this strategy has been used for many different semiconductor NCs, the emission of NC-based aerogels is limited to the ultraviolet and visible and no near-infrared (NIR) emitting NC-based aerogels have been investigated in literature until now...
September 12, 2023: Nanoscale advances
https://read.qxmd.com/read/37686955/sub-bandgap-sensitization-of-perovskite-semiconductors-via-colloidal-quantum-dots-incorporation
#25
JOURNAL ARTICLE
G Ribeiro, G Ferreira, U D Menda, M Alexandre, M J Brites, M A Barreiros, S Jana, H Águas, R Martins, P A Fernandes, P Salomé, M J Mendes
By taking advantage of the outstanding intrinsic optoelectronic properties of perovskite-based photovoltaic materials, together with the strong near-infrared (NIR) absorption and electronic confinement in PbS quantum dots (QDs), sub-bandgap photocurrent generation is possible, opening the way for solar cell efficiencies surpassing the classical limits. The present study shows an effective methodology for the inclusion of high densities of colloidal PbS QDs in a MAPbI3 (methylammonium lead iodide) perovskite matrix as a means to enhance the spectral window of photon absorption of the perovskite host film and allow photocurrent production below its bandgap...
August 29, 2023: Nanomaterials
https://read.qxmd.com/read/37669406/room-temperature-multigram-scale-synthesis-and-conversion-mechanism-of-highly-luminescent-lead-sulfide-quantum-dots
#26
JOURNAL ARTICLE
Zhen Jia, Yu Dai, Haoyun Shao, Jingyi Xu, Qingyu Meng, Juan Qiao
PbS quantum dots (QDs) are attractive near-infrared (NIR) materials, but traditional synthetic methods require inert atmosphere and/or high temperature. Herein we develop a facile, room-temperature synthetic route for in situ halide passivated PbS QDs through controllable reactions between lead halide, N , N '-diphenyl thiourea, and oleyamine (OLA) in toluene. Contrast experiments and theoretical calculations reveal that the OLA plays a bifunctional role as a mild base to initiate the formation of PbS monomers and as a dynamic ligand to control the crystallization of PbS QDs and further ligand exchange...
September 5, 2023: Journal of Physical Chemistry Letters
https://read.qxmd.com/read/37631750/pbs-qd-coated-si-micro-hole-array-graphene-vdw-schottky-near-infrared-photodiode-for-ppg-heart-rate-measurement
#27
JOURNAL ARTICLE
Mingyuan Xu, Yinghao Cui, Tao Zhang, Mengxue Lu, Yongqiang Yu
Near-infrared (NIR) photodetectors (PDs) have attracted much attention for use in noninvasive medical diagnosis and treatments. In particular, self-filtered NIR PDs are in high demand for a wide range of biomedical applications due to their ability for wavelength discrimination. In this work, we designed and then fabricated a Si micro-hole array/Graphene (Si MHA/Gr) van der Waals (vdW) Schottky NIR photodiode using a PbS quantum dot (QD) coating. The device exhibited a unique self-filtered NIR response with a responsivity of 0...
August 16, 2023: Sensors
https://read.qxmd.com/read/37555299/building-in-biologically-appropriate-multifunctionality-in-aqueous-copper-indium-selenide-based-quantum-dots
#28
JOURNAL ARTICLE
Xiling Yang, Yun Li, Peisen Zhang, Lingfei Guo, Xiaoqi Li, Yiyang Shu, Kuiyu Jiang, Yi Hou, Lihong Jing, Mingxia Jiao
Advanced nanoplatforms equipped with different functional moieties for theranostics hold appealing promise for reshaping precision medicine. The reliable construction of an individual nanomaterial with intrinsic near-infrared (NIR) photofunction and magnetic domains is much desired but largely unexplored in a direct aqueous synthesis system. Herein, we develop an aqueous phase synthetic strategy for Mn2+ doping of ZnS shell grown on Zn-Cu-In-Se core quantum dots (ZCISe@ZnS:Mn QDs), providing the optimal NIR fluorescence quantum efficiency of up to 18...
August 9, 2023: Nanoscale
https://read.qxmd.com/read/37542962/nir-responsive-photoelectrochemical-sensing-platform-for-the-simultaneous-determination-of-tetrodotoxin-and-okadaic-acid-in-nassariidae
#29
JOURNAL ARTICLE
Chenyan Zheng, Rui Ge, Jie Wei, Tianhui Jiao, Qingmin Chen, Quansheng Chen, Xiaomei Chen
Simultaneous detection of tetrodotoxin (TTX) and okadaic acid (OA) is important for seafood safety. In this work, a novel paper electrode-based near-infrared (NIR) light-responsive photoelectrochemical (PEC) immunosensor was constructed using Ag2 S quantum dots (QDs) and NaYF4 : Yb, Er upconversion nanoparticles (UCNPs) matched with BiOI for the simultaneous detection of TTX and OA in aquatic products. A low-cost, easily prepared gold nanoparticle-functionalized paper-based screen-printed electrode with six channels was designed to immobilize OA and Ab1 of TTX...
July 29, 2023: Food Chemistry
https://read.qxmd.com/read/37431842/bifunctional-strategy-toward-constructing-perovskite-upconversion-lab-on-paper-photoelectrochemical-device-for-sensitive-detection-of-malathion
#30
JOURNAL ARTICLE
Guofu Wang, Lin Li, Huandong Zheng, Qiuyi Li, Jiali Huang, Lina Zhang, Hongmei Yang, Kang Cui, Jinghua Yu
Bifunctional nanocrystals which combine two kinds of materials into single nanoparticles hold great promise in photoelectrochemical (PEC) analysis, particularly for nanocrystals based on perovskite quantum dots (QDs) which generally exhibit excellent photoelectric activity yet poor stability and upconversion nanoparticles (UCNP) that normally suffer from negligible photoelectric activity. Therefore, to achieve good performance of the PEC bioassay platform, it is valuable to combine perovskite QDs with UCNP encapsulation and promote their advantages to form hybrid nanocrystals that are stable, NIR excitable, and photoelectric...
July 11, 2023: ACS Nano
https://read.qxmd.com/read/37417755/unveiling-the-energy-transfer-mechanism-between-aqueous-colloidal-nir-ii-quantum-dots-and-water
#31
JOURNAL ARTICLE
Hongchao Yang, Renfu Li, Ziqiang Sun, Yejun Zhang, Hongbing Zhan, Xueyuan Chen, Qiangbin Wang
Hydrophilic semiconductor quantum dots (QDs) with emission in the second near-infrared window (NIR-II) have been widely studied in bioimaging applications. In such cases, QDs are usually dispersed in water. As is known, water has strong absorbance in the NIR-II region. However, investigations on the interaction between NIR-II emitters and water molecules are ignored in previous studies. Herein, we synthesized a series of mercaptoundecanoic acid-coated silver sulfide (Ag2S/MUA) QDs with various emissions that partially or completely overlapped with the absorbance of water at 1200 nm...
July 7, 2023: Journal of Chemical Physics
https://read.qxmd.com/read/37387232/nir-quantum-dot-construction-of-a-fluorescence-anisotropy-signal-amplification-biosensor-for-sensitive-rapid-and-separation-free-detection-of-dopamine-in-serum
#32
JOURNAL ARTICLE
Jing Liu, Ming Chen, Zhi-Ling Zhang, Xuechuan Hong, Zi-Li Yu, Zhi-Quan Tian
Dopamine (DA) is an important small-molecule neurotransmitter, which is closely related to the development of many neurological diseases and has received increasing attention in the diagnosis of neurological diseases. Currently, the assays of the detection of dopamine such as electrochemical and colorimetric methods have low sensitivity, poor selectivity and susceptibility to interference, which limit the accurate quantification of dopamine. Fluorescence anisotropy immunoassay is a traditional analytical method in which the quantification is based on the change in fluorescence anisotropy values observed when fluorescence molecules are bound to a certain volume and mass of the material...
June 30, 2023: Analyst
https://read.qxmd.com/read/37330116/preparation-of-thrombin-loaded-calcium-alginate-microspheres-with-dual-mode-imaging-and-study-on-their-embolic-properties-in-vivo
#33
JOURNAL ARTICLE
Tingting Han, Luping Chen, Fengyuan Gao, Song Wang, Jian Li, Guangwen Fan, Hailin Cong, Bing Yu, Youqing Shen
Transcatheter arterial embolization (TAE) has played a huge role in the interventional treatment of organ bleeding and accidental bleeding. Choosing bio-embolization materials with good biocompatibility is an important part of TAE. In this work, we prepared a calcium alginate embolic microsphere using high-voltage electrostatic droplet technology. The microsphere simultaneously encapsulated silver sulfide quantum dots (Ag2 S QDs) and barium sulfate (BaSO4 ), and fixed thrombin on its surface. Thrombin can achieve an embolic effect while stopping bleeding...
June 15, 2023: European Journal of Pharmaceutics and Biopharmaceutics
https://read.qxmd.com/read/37306666/controllable-regulation-of-ag-2-s-quantum-dots-mediated-protein-nanoassemblies-for-imaging-guided-synergistic-pdt-ptt-chemotherapy-against-hypoxic-tumor
#34
JOURNAL ARTICLE
Mengjie He, Ziyi Cheng, Zhenkai Wang, Min Li, Huixian Liang, Heng Liu, Lijuan Yu, Linlu Zhao, Fabiao Yu
The combination of phototherapy and chemotherapy holds great potential for cancer treatment, while hypoxia in tumor as well as unexpected drug release largely restrict anticancer therapy. Inspired by the natural intelligence, herein we present for the first time a "bottom-up" protein self-assembly strategy mediated by NIR quantum dots (QDs) with multicharged electrostatic interactions to develop a tumor microenvironment (TME)-responsive theranostic nanoplatform for imaging-guided synergistic PDT/PTT/chemotherapy...
June 12, 2023: Advanced Healthcare Materials
https://read.qxmd.com/read/37294926/ala-ag-2-s-mno-2-hybrid-nanoparticles-for-near-infrared-image-guided-long-wavelength-phototherapy-of-breast-cancer
#35
JOURNAL ARTICLE
Mahshid Hashemkhani, Eda Celikbas, Minahil Khan, Alphan Sennaroglu, Havva Yagci Acar
The combination of photothermal therapy (PTT) and photodynamic therapy (PDT) based on temperature increase and the formation of reactive oxygen species (ROS), respectively, is an exciting avenue to provide local and improved therapy of tumors with minimal off-site toxicity. 5-Aminolevulinic acid (ALA) is one of the most popular PDT pro-drugs, and its efficiency improves significantly when delivered to tumors with nanoparticles (NPs). But the tumor site's hypoxic environment is a handicap for the oxygen-consuming PDT process...
June 9, 2023: ACS Biomaterials Science & Engineering
https://read.qxmd.com/read/37277958/agaus-quantum-dots-as-a-highly-efficient-near-infrared-electrochemiluminescence-emitter-for-the-ultrasensitive-detection-of-microrna
#36
JOURNAL ARTICLE
Yu-Ting Yang, Yu-Zhuo Guo, Zhao-Chen Shen, Jia-Li Liu, Ruo Yuan, Ya-Qin Chai
Herein, the novel alloyed silver gold sulfur quantum dots (AgAuS QDs) with highly efficient near-infrared (NIR) electrochemiluminescence (ECL) emission at 707 nm were successfully prepared to construct a biosensing platform for ultrasensitive detection of microRNA-222 (miRNA-222). Interestingly, AgAuS QDs revealed excellent ECL efficiency (34.91%) compared to that of Ag2 S QDs (10.30%), versus the standard [Ru(bpy)3 ]2+ /S2 O8 2- system, which benefited from the advantages of abundant surface defects and narrow bandgaps by Au incorporation...
June 5, 2023: Analytical Chemistry
https://read.qxmd.com/read/37245460/highly-efficient-near-infrared-electrochemiluminescence-resonance-energy-transfer-system-for-biosensing-nonmetallic-plasmon-mediated-well-matched-energy-donor-acceptor-pair
#37
JOURNAL ARTICLE
Meng Wei, Xiaojiao Du, Ding Jiang, Yude Zhang, Xueling Shan, Wenchang Wang, Hiroshi Shiigi, Zhidong Chen
Herein, a well-matched energy donor-acceptor pair strategy was designed to construct highly efficient NIR ECL-RET system. In detail, an ECL amplification system consisting of SnS2 quantum dots decorated Ti3 C2 MXene nanocomposites (SnS2 QDs-Ti3 C2 ) as the energy donor were developed via a one-pot method, and the nanocomposites exhibited highly efficient NIR ECL emission due to the surface-defect effect generated by the oxygen-containing functional groups in MXene. Nonmetallic plasmon hydrated defective tungsten oxide nanosheets (dWO3 •H2 O) were utilized as energy acceptors because of its strong surface plasmon resonance effect in Vis-NIR absorption range...
May 22, 2023: Biosensors & Bioelectronics
https://read.qxmd.com/read/37229815/a-novel-strategy-to-construct-activatable-silver-chalcogenide-quantum-dots-nanoprobe-for-nir-%C3%A2-fluorescence-imaging-of-hypochlorous-acid-in-vivo
#38
JOURNAL ARTICLE
Yajie Chi, Qing Hu, Shuxiao Yi, Huijiao Qu, Yan Xiao
It is necessary to develop sensitive and selective probes for real-time in vivo monitoring of hypochlorous acid (HClO) which plays a significant role in physiological and pathological processes. The second near-infrared (NIR-Ⅱ) luminescent silver chalcogenide quantum dots (QDs) have shown great potential in developing activatable nanoprobe for HClO in terms of their outstanding imaging performance in the living organism. However, the limited strategy for the construction of activatable nanoprobes severely restricts their widespread applications...
May 12, 2023: Talanta
https://read.qxmd.com/read/37161740/using-host-guest-interactions-at-the-interface-of-quantum-dots-to-load-drug-molecules-for-biocompatible-safe-and-effective-chemo-photodynamic-therapy-against-cancer
#39
JOURNAL ARTICLE
Xiaoxia Wu, Jinghui Yang, Jie Xing, Yonglei Lyu, Ruifen Zou, Xin Wang, Junlie Yao, Dinghu Zhang, Dawei Qi, Guoliang Shao, Aiguo Wu, Jianwei Li
Combining photodynamic therapy (PDT) and chemotherapy (CHT) by loading an anti-cancer drug and a photosensitizer (PS) into the same delivery nanosystem has been proposed as an effective approach to achieve synergistic effects for a safe cancer treatment. However, exploring an ideal delivery nanosystem has been challenging, because the noncovalent interactions must be maintained between the multiple components to produce a stable yet responsive nanostructure that takes into account the encapsulation of drug molecules...
May 10, 2023: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://read.qxmd.com/read/37134313/bright-fluorophores-in-the-second-near-infrared-window-hgse-cdse-quantum-dots
#40
JOURNAL ARTICLE
Ananth Kamath, Richard D Schaller, Philippe Guyot-Sionnest
Fluorophores emitting in the NIR-IIb wavelength range (1.5-1.7 μm) show great potential for bioimaging due to their large tissue penetration. However, current fluorophores suffer from poor emission with quantum yields ∼2% in aqueous solvents. In this work, we report the synthesis of HgSe/CdSe core/shell quantum dots (QDs) emitting at 1.7 μm through the interband transition. Growth of a thick shell led to a drastic increase in the photoluminescence quantum yield, with a value of 63% in nonpolar solvents...
May 3, 2023: Journal of the American Chemical Society
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