GREEN CHEMISTRY
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2015
·Vol. 17
·期 8
·4482-4488
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IF 8.02
Xiaojiao Kang,Yanchun Yang,Lijian Huang,Ying Tao,Lan Wang,Daocheng Pan
Water-soluble CuInSe2/ZnS (CISe/ZnS) and AgInSe2/ZnS (AISe/ZnS) core/shell quantum dots (QDs) on a multigram scale have been synthesized by using gelatin and thioglycolic acid as dual stabilizers in an electric pressure cooker. The core/shell QDs present composition-tunable emission in the range of 582 nm to 686 nm with a maximum PLQY of 23.3%. The core/shell QDs also exhibit good water/buffer stability. The red-emitting CISe/ZnS QDs are applied as wavelength converters to achieve warm white light-emitting diodes.
研究领域:
材料科学
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光学
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纳米技术
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DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 20
·4056-4063
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IF 1.915
Shifeng Li,Li Zhang,Lei Chen,Yiman Zhong,Yonghong Ni
ZnSe quantum dots (QDs) with a homogeneous size distribution and good stability were synthesized by the reaction of zinc acetate and NaHSe in the presence of glutathione (GSH). The obtained ZnSe QDs were characterized using transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). Simultaneously, UV-visible spectroscopy (UV-vis) was performed and the fluorescence properties of ZnSe QDs were investigated. The effect of ZnSe QDs on the luminol–potassium periodate (KIO4) chemiluminescence (CL) system, a popular model CL system, was researched. It was found that as-prepared ZnSe QDs could strongly enhance the chemiluminescence (CL) of the luminol–KIO4 system. To discuss the mechanism of the CL enhancement, we studied the UV-vis and CL spectra of the luminol–KIO4–ZnSe QDs system. The CL enhancement should be attributed to the oxidation of luminol to its excited state by KIO4, under the catalysis of ZnSe QDs, which caused strong light emission. It was found that rutin, p-t-butylprocatechol, catechol, paracetamol, resorcinol and tryptophan could markedly inhibit the CL of the luminol–KIO4–ZnSe QDs system among 17 kinds of amino acids and 23 other kinds of organics. The above phenomena presented good linear relations. Thus, effective methods to detect them were developed.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 26
·15757-15765
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IF 10.733
Rui Xu,Lulu Huang,Jian Zhang,Di Li,Jizi Liu,Jiang Liu,Jun Fang,Meiyu Wang,Guodong Tang
Thermoelectric materials that can directly convert thermal energy into electrical energy have great potential in solving the present energy crisis. SnSe has emerged as one of the most intriguing new thermoelectric materials since the discovery of the excellent thermoelectric properties of its single crystals. Here, we develop a new solution synthesized method (in situ magnetic field-assisted hydrothermal synthesis) for achieving new nanostructured SnSe integrated with Se quantum dots. The critical nucleation energy reduces and the nucleation rate increases during the hydrothermal synthesis process as a high magnetic field is applied, which leads to the presence of the homogeneous distribution of Se quantum dots and smaller nano grains. Enhanced density of states and the energy filtering effect contribute towards a significant enhancement in the Seebeck coefficient and power factor (PF) due to the Se quantum dots and smaller nano grains. The enhanced density of states was directly identified by ultraviolet photoelectron spectroscopic measurements. With the aid of a high magnetic field in solution chemistry, these materials maintain low thermal conductivity due to the Se quantum dots, smaller nano grains and nanoprecipitates. Benefiting from the enhanced power factor and reduced thermal conductivity, a high figure of merit (ZT) of ∼2.0 at 873 K was achieved in a Se quantum dot/Sn0.99Pb0.01Se nanocomposite. This work paves the way for the design of prospective thermoelectric materials by applying an external high magnetic field.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Jilei Chen,Lu Zhang,Shulan Li,Feng-Lei Jiang,Peng Jiang,Yi Liu
Copper indium selenide (CISe) quantum dots (QDs) are a class of extremely appealing candidates for various biological applications due to their composition- and size-dependent photoluminescence and low toxicity. However, the synthesis of high-quality water-soluble CISe QDs with controlled composition in the aqueous phase is still a great challenge, which limits their biological applications. Moreover, the effects of the copper content in CISe QDs on the fluorescence and the corresponding mechanism are still subject to debate. Herein, a composition-tunable aqueous synthesis of high-quality Cu-deficient CISe QDs was presented, and the effects of the copper content on the fluorescence of CISe QDs was studied by the time-resolved fluorescence. The composition of CISe QDs could be flexibly controlled by manipulating the reaction temperature, the reaction time, and the Cu/In precursor ratio. The time-resolved fluorescence of CISe QDs with different Cu/In ratios suggested that the donor–acceptor pair (DAP) recombination was enhanced gradually with the increase of copper vacancies, resulting in the enhancement of fluorescence. However, if copper vacancies achieved an excessive concentration, the fluorescence would decrease possibly due to Auger recombination. The optimized CISe QDs with the maximum quantum yield of 10.3% were obtained with the Cu/In ratio, reaction temperature, and reaction time of 1/5, 170 °C, and 1 h, respectively. Based on the intense emission of the Cu-deficient CISe QDs, a highly sensitive “turn-on” fluorescent probe was developed for the detection of adenosine triphosphate (ATP) in living cells with a limit of detection of 56 nM. This work provides a paradigm for the aqueous-phase synthesis and applications of ternary I–III–VI QDs.
研究领域:
生物化学
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纳米医学
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分析化学
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DOI
高影响因子
NANO
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2020
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IF 1.566
Weili Li,Hongchao Geng,Lu Yao,Haiyan Xu,Yongjun Han,Pengtao Sheng
Oil phase CuInSe 2 quantum dots (CISe QDs) were synthesized via a hot-injection method, exhibiting a near-infrared (NIR) emission wavelength of 710 nm with poor fluorescence intensity. Therefore, we address this challenge by introducing two strategies: doping and ligand exchange. First, Zn was used as a dopant to improve the fluorescent properties of CISe QDs synthesized by the same method. The PL peak position of the resulting Zn–CuInSe (ZnCISe) QDs could be tuned from 600 nm to 662 nm, and the PL intensity of the QDs was greatly improved. Except that, this Zn doping strategy can help to improve the fluorescence lifetime and reduce defects, leading to increased quantum yield. Next, the aqueous phase transfer of ZnCISe QDs was achieved through an efficient ligand exchange strategy using glutathione (GSH) as the bifunctional ligand. Mercaptoacetic acid (MPA) was also used as an essential additive for GSH ligand exchange. With this method, we obtained high-quality hydrophilic ZnCISe QDs with particle sizes less than 3 nm and good monodispersity. In addition, DLS measurements showed a unimodal peak shape of the hydrated ZnCISe QDs in ultrapure water with particle sizes ranging from 7 nm to 40 nm. Finally, the cytotoxicity studies revealed that the viabilities of the cells incubated with ZnCISe QDs from 1 μ g/mL to 18 μ g/mL remained at levels greater than 90%, which indicates that QDs with good biocompatibility are promising fluorescent probes.
研究领域:
材料科学
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生物医学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 14
·6540-6550
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IF 3.3
Guoxu Ni,Yingjie Zhang,Yuzheng Li,Chengxiao Xu,Jinjie Zhang,Peipei Huo,Bo Liu
Metal selenides are considered outstanding potential anodic materials of sodium ion batteries due to their large specific capacity. However, their actual application is heavily restricted because of the unfavorable volume expansion, inferior cycling stability, as well as inactive kinetics. To solve this problem, the structure of SnSe@f-Ti3C2 was rationally designed and synthesized via a simple one-pot solvothermal process for the first time in this work. The high-capacity 0D SnSe quantum dots grow in situ and are characterized as homogeneously distributed on the 2D conductive MXene sheet via the electrostatic attraction of Sn ions and MXene. The SnSe@f-Ti3C2 composite exhibits a remarkably increased capacity of 540 mA h g−1 at 0.05 A g−1 and excellent cycle performance of 97.79% retention ratio after 100 cycles at 0.5 A g−1. The outstanding electrochemical performance of the SnSe@f-Ti3C2 hybrid was mainly attributed to the synergy between 0D SnSe with high capacitance and the 2D MXene sheet with superior conductivity. On one hand, 0D SnSes act as pillars between MXene layers in order to prevent the stacking of MXene nanosheets. On the other hand, the fast electron/ion transport capability and large specific surface area provided by MXene as a conductive skeleton facilitates favorable transfer kinetics as well as close contact in the electrolyte/electrode interface.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 30
·8379-8389
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IF 3.637
Geng Hongchao,Qiao Yan,Jiang Ning,Li Chenyi,Zhu Xingqi,Li Weili,Cai Qingyun
Bacteria are everywhere and pose severe threats to human health and safety. The rapid classification and sensitive detection of bacteria are vital steps of bacterial community research and the treatment of infection. Herein, we developed optical property–superior and heavy metal–free ZnCuInSe quantum dots (QDs) for achieving rapid discrimination of Gram-positive/Gram-negative bacteria by the naked eye; driven by the structural differences of bacteria, ZnCuInSe QDs are effective in binding to Gram-positive bacteria, especially Staphylococcus aureus ( S . aureus ), in comparison with Gram-negative bacteria and give discernable color viewed by the naked eye. Meanwhile, based on its distinctive fluorescence response, the accurate quantification of S . aureus was investigated with a photoluminescence system in the concentration ranges of 1 × 10 3 to 1 × 10 11 CFU/mL, with a limit of detection of 1 × 10 3 CFU/mL. Furthermore, we demonstrated the feasibility of ZnCuInSe QDs as a fluorescence probe for imaging S . aureus . This simple strategy based on ZnCuInSe QDs provides an unprecedented step for rapid and effective bacterial discrimination, detection, and imaging.
研究领域:
微生物学
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生物医学工程
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光学
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 50
·505406
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IF 3.874
Chenyuan Zhao,Yuxiang Zhou,Tianyu Shi,Desong Guo,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
The low sulfur utilization, cycling instability, and sluggish kinetics are the critical obstructions to practical applications of lithium–sulfur batteries (LSBs). Constructing sulfur hosts with high conductivity, suppressed shuttle effect, and rapid kinetics is essential for their practical application in LSBs. Here, we synthetically utilized the merits of ZnSe quantum dots (QDs) and layered Ni(OH)2 to boost the performance of LSBs. A novel core–shell ZnSe-CNTs/S@Ni(OH)2 was constructed using the ZnSe-CNTs network as framework to load sulfur and following with Ni(OH)2 encapsulation. The CNT network decorated with ZnSe QDs not only serves as a conductive framework providing fast electron/ion transfer channels, but also limits polysulfide diffusion physically and chemically. Layered Ni(OH)2, the wrinkled encapsulation, not only permits fast electron/ion transfer, but also buffers the expansion, confines active materials, and limits the polysulfide dissolution chemically. When used as a cathode, ZnSe-CNTs/S@Ni(OH)2 presents enhanced electrochemistry performance compared with ZnSe-CNTs/S and CNTs/S. The average specific capacity decreases from 1021.9 mAh g−1 at 0.2 C to 665.0 mAh g−1 at 2 C, showing rate capacity much higher than ZnSe-CNTs/S and CNTs/S. After 150 cycles, the capacity at 0.5 C slowly reduces from 926.7 to 789.0 mAh g−1, showing high retention of 85.1%. Therefore, our investigation provides a new strategy to construct a promising sulfur cathode for LSBs.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Nanoscale Advances
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2021
·Vol. 3
·期 8
·2334-2342
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IF 4.553
Senlin Qu,Xin Yuan,Yu Li,Xingyang Li,Xiujuan Zhou,Xiaogang Xue,Kexiang Zhang,Juan Xu,Changlai Yuan
The composition and defect tolerance of CuInSe2 (CISe) quantum dots (QDs) provide a scaffold to design defects via tailoring the elemental ratio or distributions for boosting photocatalytic H2 evolution (PHE). Herein, a ligand-assisted two-step aqueous method was developed to prepare defect CISe quantum dots for the first time. UV-vis, XPS, HRTEM, and HADDF investigations confirmed the typical double-absorption edges of copper vacancy defects and indium substituted at copper site defects in the structure constructed through initial synthesis tuned by Cu/In ratio and the ensued coarsening. The steady-transient PL suggested that the D–A recombination with prolonged PL lifetime dominated the emission of composition-optimized CuInSe2 with the Cu/In ratio of 1/4 (CISe-1/4). Further transient photocurrent and electrochemical impedance spectroscopy investigations demonstrated that surface defects in the structure favor the carriers' separation/transportation. The CISe-1/4 exhibited a superior PHE rate of 722 μmol g−1 h−1, about 23 times higher than that of the initially synthesized CISe-1/4 nucleus (31 μmol g−1 h−1), with a maximum apparent quantum efficiency (AQE) of 1.3%. The analysis of energy levels and the coulombic interaction energy of electron–hole (Je/h) based on Raman, extending UV-vis spectra investigations suggested that surface defects resulted in decreased Je/h of CISe-1/4, favoring the enhanced PHE of this structure. This work is expected to provide a reference for designing effective non-noble metal I–III–VI photocatalysts.
研究领域:
材料科学
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化学
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能源科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Mengchun Zhu,Shengyi Yang,Guanzhen Zou,Haiyuan Xin,Zhenhua Ge,Ying Wang,Bingsuo Zou,Yurong Jiang
As a promising material, lead selenide (PbSe) colloidal quantum dots (CQDs) are widely studied for its applications in the next generation photodetectors due to their solution-processability and low cost. However, the (100) surfaces PbSe QDs are usually passivated incompletely by the traditional liquid-phase ligand exchange with the halogen ligands when the diameter of PbSe QDs is larger than 5.0 nm. As compared to the traditional strategies of the halogen ligands, in this work methylammonium acetate (MAAc) was added as an additive into the PbI 2 ligand solution to form the perovskite intermediate (i.e. MAPbI 3-x Ac x ) as the ligand attached onto the (100) face of PbSe, in this way, to enhance the surface passivation and the dispersion of PbSe CQDs. Therefore, the as-synthesized infrared photodetector ITO/ZnO/PbSe-MAPbI 3-x Ac x /Ag showed decreased dark current by more than five-fold, and thus its device performance is enhanced greatly. As a result, a high photoresponsivity of 0.32 mA/W with a specific detectivity of 1.16 × 10 11 Jones was obtained from the photodetector ITO/ZnO/PbSe-MAPbI 3-x Ac x /Ag under 47.8 µW/cm 2 1550 nm illumination. Thus, it provides a supplemental solution to completely surface-passivate CQDs in large size for next generation optoelectronics.
研究领域:
材料科学
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光电技术
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DOI
高影响因子
Journal of Materials Chemistry C
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2025
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IF 5.1
Lizhao Nie,Linqi Chen,Jingzhou Li,Yijing Wang,Xiaoxia Wang,Long Zhang,Hongxing Dong,Anlian Pan
Copper indium selenide (CISe) quantum dots (QDs), a class of narrow bandgap and environmentally friendly QDs, have been developed rapidly for application in the fields of biomedicine, solar cells, and telecommunications. However, synthesizing CISe QDs that emit beyond 800 nm while maintaining high photoluminescence quantum yields (PLQY) remains a significant challenge. Herein, we employed a hot injection solution method to synthesize high-quality core–shell structure Zn:CuInSe2/ZnS QDs by adjusting the stoichiometric ratio of the CISe core and doping with Zn2+. The fabricated QDs exhibit a high PLQY of 62.7% at an emission wavelength of 810 nm with excellent photochemical stability and a large Stokes shift (150 nm). This can be attributed to pre-doping, which suppresses the cation exchange between Zn2+ and Cu+ or In3+ during the shelling process, and the passivation effects of ZnS on surface defects of the QDs. Furthermore, we demonstrate their application by using a home-built optical wireless communication (OWC) test platform, and the prepared QDs exhibit a modulation bandwidth of 3.23 MHz. With a bit error rate (BER) below the forward error correction (FEC) threshold of 0.0038, the system is capable of achieving a maximum data transmission rate of 14 Mbps. The synthesized high-efficiency PLQY Zn:CuInSe2/ZnS QDs could be expected to promote the development of near-infrared (NIR) wireless communications.
研究领域:
材料科学
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光电子学
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通信工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
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IF 7.3
Yang Hao,Jingkun Ren,Mengxue Sun,Xiaoxiao Geng,Yaohui Gu,Yuan Li,Yuying Hao
SnSe quantum dots (QDs) exhibit exceptional photoelectric and thermoelectric properties, making them highly promising for a wide range of applications in both photoelectric and thermoelectric devices. However, the scalable production of high-quality SnSe QDs with high yield remains a significant challenge. In this study, we present a borax-assisted ball-milling and sonication-assisted solvent exfoliation method to prepare SnSe QDs with lateral sizes on the scale of 5 nm from SnSe single crystals. The resulting SnSe QDs feature pristine surfaces, high crystallinity, and an impressive yield of 43.3%. The thin film formed by these pristine SnSe QDs displays a broad band gap and strong photoluminescence. In addition, a SnSe QDs thin film is utilized as an electron transfer layer (ETL) in n-i-p perovskite solar cells (PSCs), achieving a photoelectric conversion efficiency (PCE) of 21.33%, approaching the PCE (22%) of SnO2-based PSCs and significantly higher than the PCE of 14.49% observed in PSCs without an ETL. Furthermore, when the SnSe QD thin film is modified by streptomycin sulfate, the PCE of the corresponding PSC increases to 23.20%. This method for preparing SnSe QDs not only facilitates large-scale production but also opens up new avenues for a comprehensive exploration of their performance potential and shows the prospect of SnSe QD application in optoelectronic devices.
研究领域:
材料科学
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能源科学
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纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）