ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Weidong Cai,Zhixing Gan,Feng Nan,Shun Wang,Fuxiang Ji,Yiqiang Zhan
We present a novel and stable laminated structure to enhance the performance and stability of silicon (Si) photocathode devices for photoelectrochemical (PEC) water splitting. First, by utilizing Cu nanoparticle catalysts to work on a n+p-black Si substrate via the metal-assisted chemical etching, we can achieve the black silicon with a porous pyramid structure. The low depth holes on the surface of the pyramid caused by Cu etching not only help enhance the light capture capability with quite low surface reflectivity (<5%) but also efficiently protect the p–n junction from damage. To improve the charge migration efficiency and mitigate parasitic light absorption from cocatalysts at the same time, we drop casted quantum dots (QDs) MoS2 with the size of nanometer scale as the first layer of catalyst. Hence, we then can safely electrodeposit cocatalyst Co nanoparticles to further enhance interface transfer efficiency. The synergistic effects of cocatalysts and optimized light absorption from the morphology and QDs contributed to the overall enhancement of PEC performance, offering a promising pathway for an efficient, low cost, and stable (over 100 h) hydrogen production photocathode.
研究领域:
材料科学
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可再生能源
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光催化
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纳米技术
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半导体器件
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DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2019
·Vol. 95
·期 3
·895-900
·
IF 2.338
Qiuyue Wang,Xuehan Wang,Yiwei Wu
A simple, cheap, sensitive and selective probe for determination of DNPH in wastewater using thioglycolic acid (TGA)-coated CdTe QDs (TGA-QDs) as fluorescence probe has been established, and the properties of CdTe QDs were characterized by TEM, FT-IR, DLS, XRD and zeta potentials. CdTe QDs fluorescence is highly efficiently quenched after adding DNPH on account of electron transfer effect, and the fluorescence quenching behavior of CdTe QDs interaction with DNPH is static quenching process. A good linear relationship is observed between the relative fluorescence intensity ( F 0 / F ) and 0.06–10 ng mL −1 of DNPH. As compared with some of reported methods, LOD of this method for analysis of DNPH (0.23 ng mL −1 ) is the lowest. Masking agents of DDTC and NH 4 OH can eliminate the interference of Cu 2+ , Ag + and Hg 2+ . Hence, DNPH can be selectively and accurately detected and the established method was successfully used for detecting DNPH in wastewater with acceptable recovery of 90.6–102%.
研究领域:
环境化学
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分析化学
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纳米材料
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荧光传感
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水质监测
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高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-12
·
IF 12.264
Yang Xiaokun,Yang Ji,Khan Jahangeer,Deng Hui,Yuan Shengjie,Zhang Jian,Xia Yong,Deng Feng,Zhou Xue,Umar Farooq,Jin Zhixin,Song Haisheng,Cheng Chun,Sabry Mohamed,Tang Jiang
The hydroiodic acid was explored systematically to modify PbS quantum dots (QDs) ink process, which could remove trap states by hydroxyl ligand and improve iodine passivation on the PbS-QDs surface.
This strategy solved the essential question of PbS-QDs ink process and showed the favorable application prospects in QDs technology.
研究领域:
材料科学
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纳米技术
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高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Licai Hao,Yang Shen,Xuanhu Chen,Xiaodong Yang,Qianqian Du,Yue Bian,Liang Chen,Kun Tang,Rong Zhang,Youdou Zheng,Shulin Gu
We report the interaction between different sizes of CdTe quantum dots (CdTe QDs) and copper (II) ion (Cu 2+ ) via experimental and theoretical aspects. Different sizes of CdTe QDs are synthesized and size effects on the selectivity in the detection of Cu 2+ ions are studied. Experimental results indicate that with the size of CdTe QDs from 1.8 nm to 2.7 nm and to 3.2 nm increases, the linear range gets wider. For the smallest size of QD (QD 524 , 1.8 nm), the linear range is 1.0–5.0 × 10 −5 M with a limited detection of 2.8 × 10 −5 M. The Stern–Volmer plots at different temperatures demonstrate that the fluorescence of CdTe QDs is quenched by Cu 2+ ion through a dynamic quenching mechanism, and the physiological mechanism is analyzed. Electrons are transferred from CdTe QDs to Cu 2+ ion, and Cu 2+ ion acquire electrons and are reduced to Cu + ion, leading to fluorescence quenching . Meanwhile, with the increase in the number of transferred electrons, the phenomenon of fluorescence quenching is more obvious. In order to validate the process of electron transfer , the amount of transferred charge between Cu 2+ and CdTe QDs are calculated by using first principles density functional theory (DFT). Calculation results show that the smaller the QDs are, the more electrons they transfer. The linear range of the smaller size QDs (QD 524 ) is the narrowest, indicating fluorescence quenching is indeed the most obvious of all three sizes.
研究领域:
纳米材料
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分析化学
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量子点
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环境传感
·
理论化学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Le Wu,Zheng-Zhong Lin,Jun Zeng,Hui-Ping Zhong,Xiao-Mei Chen,Zhi-Yong Huang
A magnetic fluorescent probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was prepared using CdTe QDs and Fe 3 O 4 nanoparticles as co -nucleus and molecularly imprinted polymers (MIPs) as specific recognition sites based on a reverse microemulsion method. With the specific enrichment and magnetic separation properties, the probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was used to detect malachite green (MG) in fish samples. The TEM analysis showed that the particles of CdTe QDs/nano-Fe 3 O 4 @MIPs were spherical with average diameter around 53 nm, and a core-shell structure was well-shaped with several Fe 3 O 4 nanoparticles and CdTe QDs embedded in each of the microsphere . Quick separation of the probes from solutions could be realized with a magnet, indicating the excellent magnetic property of CdTe QDs/nano-Fe 3 O 4 @MIPs. The probe exhibited high specific adsorption towards MG and excellent fluorescence emission at λ em 598 nm. The fluorescence of CdTe QDs/nano-Fe 3 O 4 @MIPs could be linearly quenched by MG at the concentrations from 0.025 to 1.5 μmol L −1 . The detection limit was 0.014 μmol L −1 . The average recovery of spiked MG in fish samples was 105.2%. The result demonstrated that the as-prepared CdTe QDs/nano-Fe 3 O 4 @MIPs could be used as a probe to the detection of trace MG in fish samples.
研究领域:
分析化学
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食品安全
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Zhengwei Zhang,Jiao Chen,Qiulian Yang,Kai Lan,Zhengyu Yan,Jianqiu Chen
Currently, the bio-immobilization methods displayed great potential for the removal and recycle of highly toxic metals depending on their gentle and orderly regulated cellular environment. Herein, we have presented a facile and eco-friendly strategy for bio-immobilizing cadmium (Cd) ions and to harvest CdSe quantum dots (QDs) using microalgae cells as bio-reactors. The production process has good environmental benefits for recycling hazardous Cd metal. The biosynthesized CdSe QDs exhibited superior optical properties, good water-solubility, high crystallinity structure, and were monodispersed sphere nanoparticles with approximate range of 5–6 nm in size, clearly comfirmed by the inversed fluorescent microscope, Ultraviolet-visible, photoluminescence, transmission electron microscopy analyses and so on. Owning to their fluorescence quenching effect, the as-obtained CdSe QDs could be deemed as an effective fluorencent nanoprobe for imatinib detection. The linear range for imatinib was calculated to be from 10.43 μg mL −1 to 417.30 μg mL −1 with a low detection limit of 0.014 μg mL −1 . More strikingly, the possible formation mechanism of CdSe QDs in algal cells was preliminarily speculated that could be related with the intracellular GSH, which could provide new insights for the possibility for environmental transformation of poisonous metals to fluorescent QDs.
研究领域:
生物化学
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环境科学
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纳米医学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2013
·
IF 3.473
Ting Yang,Mengmeng Lu,Xiaoli Mao,Wenhong Liu,Lei Wan,Shiding Miao,Jinzhang Xu
More than 5.0 g luminescent CdS quantum dots (QDs) were synthesized via a hot-bubbling route. The synthetic parameters including temperature, growth time, feeding ratio Cd/S and capping ligands were studied to show great influence on the optical properties . Two types of CdS “magic-sized” clusters (MSCs) emitting at 313 nm and 323 nm were obtained at temperature lower than 80 °C. The PL quantum yields of the CdS QDs reaches 11.6% when trioctyphosphine oxide was used as ligand. The prepared CdS QDs have been transferred into aqueous solution via ligand exchange (LE). To expand the spectral response in photovoltaic devices, two different sizes of CdS QDs were deposited on mesoporous TiO 2 /SiO 2 electrode, and the co-sensitized solar cells (SCs) were prepared. It was found that the co-sensitized SCs show a higher conversion efficiency ( η = 1.55%) than the single sized QDs sensitized SCs ( η = 0.53%). The incident photon-to-current conversion efficiency (IPCE) of co-sensitized SCs showed two peaks at 370 nm and 460 nm which resembles the absorption peaks of the two different sized QDs.
研究领域:
材料科学
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纳米技术
·
光电子学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Hengye Chen,Shuo Wang,Haiyan Fu,Hongliang Xie,Wei Lan,Lu Xu,Lei Zhang,Yuanbin She
Silver ions , as a commonly used industrial heavy metal, tends to deposit in the body and induce many diseases. In this work, modified CdTe QDs with green and red emission were synthesized to assemble dual-QDs, which could be efficient and selective utilized for Ag + determination through the electron transfer progress between surface functional group of dual-QDs and Ag + , and the aggregation of Ag + on the surface of dual-QDs. Under the appropriate pH value and volume ratio, the interaction between the surface functional groups of assembled dual-QDs reduce the affinity of Hg 2+ in this system. The fluorescent signal of dual-QDs simultaneously attenuation or enhancement in the same proportion remove the interference of Cu 2+ and other metal ions . Therefore, this method can selectively detect Ag + without any masking agents. The linear region of detection was from 0 to 800 nmol/L (R 2 > 0.998), and low of detection (LOD) was 7.7 nmol/L, which could meet the corresponding standards of World Health Organization (WHO) and Environmental Protection Agency (EPA). This effective proposed dual-QDs ratios fluorescent probe has been applied to detect Ag + in real environment water, tea and Citri Reticulatae Pericarpium (CRP) water.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hanwen Zhu,Min Cheng,Junchun Li,Supeng Yang,Xuyong Tao,Yongqiang Yu,Yang Jiang
It has been proved that perovskite quantum dots (QDs) have great potential in optoelectronic devices because of their excellent optical performance. However, low stability against water and oxygen environment hinders the commercial application of down-conversion display films on account of its highly ionic nature and low formation energy. Here, we demonstrate a convenient method to obtain a uniform, large-area water-oxygen-resistant quantum dot-polymer composite film via illuminating FAPbBr 3 QDs and methyl methacrylate (MMA) under white light emitting diode. We find that FAPbBr 3 QDs act as photo initiators, leading to the polymerization of organic monomers around the quantum dots. The obtained FAPbBr 3 QDs-polymer nanocomposites are independently dispersed coated with about 10 nm thick polymerized methyl methacrylate (PMMA). Due to the well protection of covered PMMA, the FAPbBr 3 QDs/PMMA nanocomposites show high tolerance to water and oxygen, and the increased PLQY and lifetime indicate the reduction of non-radiative recombination centers. Furthermore, the FAPbBr 3 QDs/PMMA nanocomposites are easy to produce large area films, and no agglomeration during films production by knife coating process. Then uniform, strong fluorescence, transparent and stable blue, green and red nanocomposite films can be prepared by optimizing the viscosity via controlling the reaction time. Finally, white LED was fabricated with a Lumen Efficiency of 80.4 m/W and Color Rendering Index of 90. Our work suggests that illuminated polymerization of perovskite quantum dots under white light emitting diode provides a simple and effective method to commercialization
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产品关联
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Bin Chen,Jun Ma,Tong Yang,Lin Chen,Peng Fei Gao,Cheng Zhi Huang
A facile one-pot method was proposed to synthesis cysteamine capped CdTe QDs with a high quantum yield 30%. In the synthesis process, nitrogen protection, ultrasonic treatment, and light irradiation were unnecessary. Additionally, potassium tellurite was used instead of Te powder as Te source, avoiding of the time-consuming Te powder dissolution process . The prepared QDs were found to be Hg 2+ sensitive. The detection linear range for Hg 2+ was from 5 to 300 nM, and the detection limit was calculated to be 1 nM. The detection mechanism was mainly ascribed to the electron transfer from cysteamine capped QDs to Hg 2+ , resulting in a fluorescence quenching phenomenon. In addition, we developed a portable RGB sensing gadget with the QDs as fluorescence probe for Hg 2+ detection, and the linear range was from 5 to 200 nM. Furthermore, the gadget was applied for Hg 2+ detection in tap water sample. The results showed that the average recoveries in real tap water sample were in the range from 97.2% to 115.3%, which indicated that accuracy and precision were satisfactory for practical application requirements.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Chunxue Li,Huinan Che,Chunbo Liu,Guangbo Che,Paul. A. Charpentier,William Z. Xu,Xiuyan Wang,Lihui Liu
In this study, we report a facile and green strategy to produce graphitic carbon nitride quantum dots (g-C 3 N 4 QDs)/BiVO 4 Z-scheme nanoheterostructure, which is composed by g-C 3 N 4 QDs assembled on the surface of mesh-like BiVO 4 crystals. As compared with pure BiVO 4 , the g-C 3 N 4 QDs/BiVO 4 composite showed significantly enhanced photocatalytic performance towards degradation of rhodamine B (RhB) and Tetracycline (TC) under visible light irradiation, which is attributed to the increased surface area, (increased number of photocatalytically active sites) and the improved efficiency of separation of photogenerated electron-hole pairs through an efficient charge transfer Z-scheme system. The stability and durability of photocatalyst are also discussed in detail. Moreover, the possible enhanced photocatalytic mechanism was put forwarded and explained by the electron spin resonance (ESR) spin-trap technique and active species trapping experiments. The successful implementation of this work will have guiding significance for the preparation of photocatalysts, and provide theoretical basis and experimental guidance for future development of Z-scheme photocatalytic mechanism of the hybrid photocatalysts with better performance.
研究领域:
材料科学
·
环境科学
·
光催化
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiufeng Wang,Yunyun Zhang,Wenhui Ai,Yao Jin,Ge Chen,Zhiqing Zhang,Guodong Zhang,Ting Zhou,Fang Wang
A ratiometric fluorescence sensor based on Mn doped ZnS QDs was designed to detect ascorbic acid with highly selectivity . The synthesized Mn doped ZnS QDs showed a new luminescence performance due to new electron hole recombination center formed in the nanocrystals . The dopant-related luminescence of Mn 2+ appeared at 590 nm, and the best dopant-related luminescence effect can be obtained by changing the doping amount of Mn 2+ during the synthesis process. Ascorbic acid (AA) is known to be oxidized by Fe 3+ to generate dehydroascorbic acid (DHAA). If DHAA combined with o-phenylenediamine (OPD), a fluorescent product quinoxaline DFQ was obtained. Mixing DFQ with Mn doped ZnS QDs , two fluorescence emission appeared at 434 nm and 590 nm. After optimizing the concentration of Fe 3+ and OPD, solution pH and reaction time, the results showed a good linear relationship between AA and the ratio of F 434 /F 590 . The linear range of this ratiometric fluorescence sensor for detection of ascorbic acid were 0.5–40 μmol·L −1 and 40–80 μmol·L −1 , and the detection limit was low to 0.21 μmol·L −1 . Compared with the single fluorescence analysis method for AA detection, this work has stronger anti-interference and greatly improved sensitivity and selectivity by ratiometric fluorescence.
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
高影响因子
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