SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Li Fu,Aiwu Wang,Kefeng Xie,Jiangwei Zhu,Fei Chen,Henggang Wang,Huaiwei Zhang,Weitao Su,Zhenguang Wang,Cangtao Zhou,Shuangchen Ruan
Sensitive and low-cost determination of Ag + is important due to the potential risk of Ag + increasingly applied in various fields. In this work, we report an extremely simple electrochemical sensor for the Ag + determination based on the sulfur quantum dots (SQDs) modified Au electrode. The SQDs were synthesized by a top-down method through alkali etching of bulk sulfur powder, which were then directly used for Au electrode surface modification due to the high affinity between Au and S atoms. The strong binding between Ag and S makes the modified electrode highly sensitive for Ag + sensing. The theoretical investigation was carried out by calculating the bond length and binding strength between Ag and S. Since the non-conductive nature of the SQDs, the amount of modifier is a crucial factor for the sensing performance. Under optimum condition, the proposed sensor showed a linear detection range of 0.1 nM to 3 μM with a detection limit of 71 pM.
研究领域:
分析化学
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材料科学
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 13
·2207
·
IF 5.719
Xin Li,Xiaobin Wang,Wei Guo,Feng Luan,Chunyuan Tian,Xuming Zhuang,Lijun Zhao
In this paper, the SQDs@MnO2NS as the probe was applied to construct a novel “turn-on” fluorescent sensor for sensitive and selective detection of hydrazine (N2H4). Sulfur quantum dots (SQDs) and MnO2nanosheets (MnO2NS) were simply mixed, through the process of adsorption to prepare the architectures of SQDs@MnO2NS. The fluorescent emissions of SQDs@MnO2NS play a key role to indicate the state of the sensor. According to the inner filter effect (IFE) mechanism, the state of the sensor at the “off” position, or low emission, under the presence of MnO2NS, is which the ultraviolet and visible spectrum overlaps with the fluorescence emission spectrum of SQDs. Under the optimal conditions, the emission was gradually recovered with the addition of the N2H4, since the N2H4as a strong reductant could make the MnO2NS converted into Mn2+, the state of the sensor at the “on”. Meanwhile, the fluorescent sensor possesses good selectivity and high sensitivity, and the detection concentration of N2H4with a wide range from 0.1 µM to 10 mM with a detection limit of 0.072 µM. Furthermore, actual samples were successful in detecting certain implications, indicating that the fluorescent sensor possesses the potential application ability to monitor the N2H4in the water.Keywords:sulfur quantum dots;MnO2nanosheet;hydrazine;fluorescence probe
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Zeming Huang,Yin Gao,Zhengyu Huang,Donglin Chen,Jiahui Sun,Li Zhou
Exploring an effective sensor to detect Fe 3+ and phytic acid (PA) is of great importance because the levels of Fe 3+ and PA have a vital impact on human health. Herein, we report a metal-free fluorescent nanoprobe for sensitive and selective sensing of Fe 3+ and PA based on the sulfur quantum dots (SQDs). The SQDs with high fluorescence quantum yield (17.6%) and low cytotoxicity can be directly synthesized from cheap elemental sulfur by one-pot reaction. The SQDs display responsive and selective fluorescence “on–off-on” behavior towards Fe 3+ and PA based on the introduction and elimination of electron transfer effect. The addition of Fe 3+ can cause non-radiative electron transfer associated with fluorescence quenching of SQDs, while the addition of PA enables SQDs/Fe 3+ complex release Fe 3+ to recover the fluorescence of SQD S . By utilizing these SQDs as a fluorescent nanoprobe, it shows good linear relationship for Fe 3+ and PA in the range of 0.05–120 µM and 0–12 µM, respectively. Moreover, its limit of detection (LOD) for Fe 3+ and PA can reach as low as 102 and 73.5 nM, respectively, which compares favorably to many reported fluorescent probes. Additionally, the use of this SQDs-based sensor to detect PA in fresh carrot and lettuce samples was examined with satisfactory performance.
研究领域:
生物化学
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分析化学
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纳米医学
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DOI
高影响因子
Chemical & Biomedical Imaging
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2024
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IF 0
Li Zhao,Tianjian Sha,Yufu Liu,Qingsong Mei,Haibin Li,Pinghua Sun,Haibo Zhou,Huaihong Cai
The large-scale preparation of fluorescent nanomaterials with laboratory-relevant chemical and optical properties will greatly forward their consumer market applications; however, it still remains challenging. In this work, a universal strategy was developed for the rapid and large-scale synthesis of fluorescent sulfur quantum dots that recently has drawn great attention because of their unique optical characteristics. From the fact that empty 3d orbitals of sulfide species are able to bind with lone-pair π electrons of the heteroatomic groups, many amino-group containing compounds, such as amino acid and polyethylenimine molecules, were exploited to synthesize sulfur quantum dots. This 10 min preparation period endowed sulfur quantum dots with bright blue fluorescence and also chirality. Due to the user-friendly and rapid operation, this strategy can be extended to the large-scale synthesis of sulfur quantum dots with a yield of 16.844 g for one batch of experiment. Moreover, it was found that the sulfur quantum dots exhibited a reversible temperature-dependent luminescent property with a sensitivity of 0.72%/°C, which showed excellent intracellular temperature monitoring capability for inflammation-related disease diagnostics.
研究领域:
材料科学
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生物医学工程
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纳米技术
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DOI
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2021
·Vol. 38
·期 4
·2000332
·
IF 3.31
Jiehao Lei,Zeming Huang,Pengxiang Gao,Jiahui Sun,Li Zhou
As a new class of metal-free fluorescent dots, sulfur quantum dots (SQDs) have attracted more and more attention because of their unique properties and promising applications in many fields. However, synthesizing SQDs with high optical stability and stimuli-responsive fluorescence is still in its infancy. Herein, a simple one-pot strategy is reported for preparing polyvinyl alcohol (PVA)-capped SQDs from cheap elemental sulfur by employing PVA as ligand. The as-prepared SQDs with size in range of 1.5–5 nm show fine water dispersibility and stability, bright fluorescence, good optical stability, and low cytotoxicity, which make them potential for cell imaging. In addition, the SQDs show sensitive and selective fluorescence quenching behavior toward Fe 3+ with a detection limit of 92 × 10 −9 m . Meanwhile, the SQDs also present temperature-dependent fluorescence and hold promise for working as a nanothermometer. For the first time, the utilization of SQDs for monitoring of Fe 3+ and temperature in the interior of cells is confirmed in this study. This work thus opens new opportunities for expanding the application fields of SQDs.
研究领域:
材料科学
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生物医学工程
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yue Lu,Jingnan Zhao,Guofeng Zhao,Peiyu Yi,Liyuan Duan,Huinan Sun,Qilei Liu,Qingwei Meng
Sulfur quantum dots, a new type of non-metallic quantum dots, have gained widespread attention as a promising alternative material. In this work, we synthesized aqueous sulfur quantum dots modified with α -cyclodextrin (CD-S dots) by hydrothermal method. Under visible light irradiation, CD-S dots could promote the dehydrogenative cross-coupling reaction of alcohols and amines to produce imine products. We demonstrated the host-guest interaction between the ligand of CD-S dots and benzyl alcohol through experiments such as nuclear magnetic resonance (NMR) spectroscopy. Consequently, benzyl alcohol could easily approach the surface of CD-S dots without being affected by the ligand, and then it could be oxidized by holes. It was suggested that CD-S dots reduced the barriers of carrier transfer through host-guest interactions with benzyl alcohol, and improved the selectivity and efficiency of the reaction. Our work provided ideas for the application of emerging sulfur quantum dots in selective organic synthesis. Based on the rich tunability of quantum dot materials, various efficient and eco-friendly catalytic systems are expected to be developed.
研究领域:
材料科学
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有机化学
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光催化技术
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Xiaohui Peng,Ya Wang,Qingying Wang,Jiaojiao Tang,Maosen Zhang,Xiupei Yang
In this work, sulfur quantum dots (TPA-SQDs) protected by terephthalic acid as a stabilizer were synthesized using a one-pot method. When excited at 310 nm, the synthesized TPA-SQDs solution emitted strong blue fluorescence at 428 nm, and the absolute quantum yield was as high as 85.99%. The proposed SQDs can be used as a fluorescent probe to specifically quench tartrazine (TZ), showing a good linear relationship (R 2 = 0.996) at TZ concentrations of 0.1–20 μM, with a detection limit of 39 nM. By analysing the fluorescence lifetime, UV–Vis absorption spectrum and zeta potential of the assay system, it can be speculated that the fluorescence quenching mechanism of TZ on TPA-SQDs is the inner filter effect (IFE). The proposed method was applied to the detection of TZ in vitamin water and orange juice, and the results were consistent with the determination results by high-performance liquid chromatography. The recoveries and relative standard deviations were 93.2–102.6% and 1.34–2.88%, respectively, which provided an alternative method for the determination of TZ in beverages or other food samples.
研究领域:
分析化学
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食品科学
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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 LUMINESCENCE
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2023
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IF 3.6
Yongfeng Liu,Xiuwen Shao,Zhaoju Gao,Xiaolin Zhu,Zhangcheng Pan,Yupeng Ying,Jinpeng Yang,Wei Pei,Jia Wang
Sulfur quantum dots (SQDs), as a novel metal-free fluorescent material, are getting increasingly tremendous attention in metal ion detection, especially for Fe 3+ , due to the merits of antimicrobial potential, low toxicity, and exciting optoelectronic properties. However, sensing mechanism of SQD based fluorescent probe for Fe 3+ is not clear yet, and high sensitivity and large detection range remain a challenge. Here, we report the synthesis of hydrophilic SQDs as a fluorescent nanoprobe for Fe 3+ via a fluorescent turn-off mode. We systematically studied the quenching mechanism by ultraviolet–visible absorption spectra , steady-state and time-resolved photoluminescent spectra, and temperature-dependent quenching constants. Results unclearly evidenced the quenching behavior to both inner filter effect and static quenching. Furthermore, the nanoprobe presents a large detection range from 2.5 to 700 μM and a limit of detection low to 53.6 nM, both of which are the record performance to our knowledge. At last, it shows high selectivity toward Fe 3+ and presents no ionic strength effect in the range of investigation, which enables surprising results for Fe 3+ detection in deionized water with interference ion and real water samples.
研究领域:
分析化学
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纳米材料科学
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环境科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 3
·1089-1097
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IF 4.831
Zhang Zhihong,Duan Fenghe,He Linghao,Peng Donglai,Yan Fufeng,Wang Minghua,Zong Wei,Jia Chunxiao
A nanocomposite consisting of zinc sulfide quantum dots and polyaniline (ZnSQD@PANI) was placed on a gold electrode along with antibody against clenbuterol to give an amperometric immunosensor for clenbuterol. Compared to the use of pristine PANI, the electrode modified with the ZnSQD@PANI nanocomposite adsorbs clenbuterol antibody much better and therefore exhibits higher sensitivity to clenbuterol. The biosensor, when operated at a working potential of 0.21 V (vs. Ag/AgCl), displays a detection limit as low as 5.5 pg⋅mL −1 and works over the 0.01 to 10 ng⋅mL −1 concentration range. Related species such as salbutamol and ractopamine, urine components such as urea and uric acid, and the ions Ca(II), Na(I), and K(I) do not interfere.
A nanocomposite of zinc sulfide quantum dots and polyaniline was synthesized and utilized as the electrode material for detecting clenbuterol hydrochloride (CH). Sensing includes immunoglobulin G anchoring, adsorption of clenbuterol antibody, and detection of clenbuterol.
研究领域:
分析化学
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生物传感技术
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纳米材料科学
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DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 4
·2519-2526
·
IF 7.79
Yilun Sheng,Zhongnan Huang,Qi Zhong,Haohua Deng,Mingchun Lai,Yu Yang,Wei Chen,Xinghua Xia,Huaping Peng
Sulfur quantum dots (SQDs) are a new kind of functional nanomaterial, but several challenges still exist in relation to their synthesis and application, such as low-yield and time-consuming synthetic methods, low photoluminescence quantum yields (PLQYs), and the non-selectivity of their detection mechanisms. Herein, we report the drastic enhancement of the fluorescence performance of water-soluble SQDs via the one-pot synthesis of size-focusing QDs using ultrasound microwave radiation. The synthetic period has been greatly shortened to 2 h via the present process. Notably, the proposed SQDs exhibit a highly stable emission wavelength with a record high PLQY of 58.6%. The mechanistic study indicates that size-focusing is a key factor relating to the proposed high-performance SQDs. As they also have robust stability, the proposed SQDs show a wide range of potential applications. Inspired by the characteristic properties of the SQDs and specific analytes, a simple SQD-based fluorescence sensing platform, via a redox-reaction-mediated mechanism, has been successfully developed for the rapid and selective detection of Ce(IV). In addition, this system has been effectively applied to some Ce(IV)-related biological assays, such as ascorbic acid (AA) analysis. This work is an important breakthrough in the SQD field, opening up avenues for solving the challenging problems relating to SQD-based probes, enriching the fundamental understanding of them, and greatly extending their applications, especially in biomedicine.
研究领域:
材料科学
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分析化学
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生物医学
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Zhao Jie,Fan Zhefeng
A turn on–off fluorometric assay for clioquinol (CQ) is described here. It is based on modulation of the fluorescence of sulfur quantum dots (SQDs; best measured at excitation/emission wavelengths of 360/426 nm) by using the Zn 2+ -CQ affinity pair. Although the fluorescence enhancement effect of Zn 2+ on SQDs was not obvious, a good quenching modulation effect was observed in the presence of CQ. This resulted in a linear analytical range that is increased by two orders of magnitude (from 0.024 μM to 0.24 μM, and 0.62 μM to 30 μM), with a detection limit (3 s ) of 0.015 μM. The selectivity of the method is also improved.
Schematic illustration of the turn on-off fluorometric assay for for clioquinol (CQ) based on Zn 2+ -modulated sulfur quantum dots (SQDs).
研究领域:
分析化学
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药理学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 186
·期 1
·1-9
·
IF 5.705
Zou Wen-Sheng,Deng Ming-Yue,Wang Ya-Qin,Zhao Xiaoli,Li Wei-Hua,Huang Xian-Huai
A method is described for the detection of Cu(II). It is based on the use of a room-temperature phosphorescent probe consisting of alginate-capped and manganese(II)-doped ZnS quantum dots. The carboxy groups at the surface of the probe strongly coordinate Cu(II) to form a complex. As a result, the 4 T 1 - 6 A 1 transition of the Mn(II) ions in the probe is quenched, and the long decay time (~2.1 ms in the unquenched state) is accordingly reduced. At excitation/emission wavelengths of 316/590 nm and a delay time of 0.1 ms, the probe shows a linear response in the 0.01 to 12 μM Cu(II) concentration range. The detection limit is 6.0 nM and the RSD is 3.2% (for n = 5).
A two-step procedure is described to synthesize alginate capped manganese doped ZnS QDs. These coordinate with Cu(II) to form an absorbent complex and can be used as a phosphorescent probe for time-resolved detection of Cu(II).
研究领域:
分析化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
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