SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Shuo Geng,Shu Min Lin,Nian Bing Li,Hong Qun Luo
As an important heavy metal ion, copper has the negative influence on otherwise healthy individuals, so establishing a valid way for the highly efficient, sensitive, and quantitative determination of Cu 2+ ion becomes an emergency in the environmental analysis. In the present work, water-soluble luminescent ZnO quantum dots (QDs) capped by polyethylene glycol (PEG) have been synthesized by a simple solution method. The PEG capped ZnO QDs (PEG@ZnO QDs) showed yellow fluorescence. High-resolution transmission electron microscopy, UV–vis absorption spectroscopy, Fourier transform infrared spectroscopy, and luminescence spectroscopy were applied to elucidate the properties of the PEG@ZnO QDs. In addition, the yellow fluorescence of the PEG@ZnO QDs was quenched when Cu 2+ ion was added to the PEG@ZnO QDs solutions. Therefore, a novel fluorescent probe was designed to detect Cu 2+ in water solution. The linear relationships were 10–200 nM and 2–10 μM, respectively, with the detection limit for Cu 2+ at 3.33 nM according to 3σ/slope (where σ denotes the standard deviation of the blank measures). The proposed sensor of the PEG@ZnO QDs has also been used in natural water samples to examine the availability of this method. In addition, the quenching mechanism was discussed, which may be attributed to the aggregation induced quenching.
研究领域:
环境分析
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材料科学
·
分析化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Gang Shu,Dan Xu,Songtao Xie,Li-Jen Chang,Xinyue Liu,Jianqing Yang,Yunchun Li,Xianxiang Wang
This study aimed to develop a novel ZnO-quantum dots-Chitosan biocomposite dressing (CS-ZnO QDs) with improved antioxidant, antibacterial, and potential infected wound healing effects. CS-ZnO QDs were synthesized successfully by incorporating ZnO QDs into chitosan, and in vitro antioxidant, antibacterial and anti-biofilms tests were conducted. Furthermore, the therapeutic effects of CS-ZnO QDs for infected wound healing were investigated. The results of the character study revealed steady compatibility between chitosan and ZnO QDs. Nonetheless, the in vitro antioxidant and antibacterial studies showed that CS-ZnO QDs had better antioxidant activity, inhibitory effects against methicillin-resistant Staphylococcus aureus (MRSA), and a vigorous eradication of bacterial biofilms compared to ZnO-QDs and CS alone. CS-ZnO QDs presented stable cyto-compatibility in NIH/3T3s cells. In addition, CS-ZnO QDs facilitated MRSA-infected wound healing by inhibition of bacterial growth, regulation of the NFκB-p65 pathway to alleviate inflammation, improve wound repairing in an adequate environment, and directly enhance re-epithelialization and collagen deposition.
研究领域:
生物材料学
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医学
·
微生物学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Wen-Jie Wu,Qi Zhao,Rui Zhou,Ya-Chuan Liang,Wen-Bo Zhao,Chong-Xin Shan
An europium functionalized ZnO quantum dots (QDs) ratiometric fluorescent nanoprobe is designed to establish a real time, on-site visual, and highly sensitive probe method for tetracycline (TC). The yellow-emitting ZnO QDs serves as the internal reference, while the Eu 3+ chelated on the surface of ZnO QDs is used as the signal reporting unit. This nanoprobe exhibits rapid response, excellent selectivity, and high sensitivity with a detection limit of 4 nM in detecting the levels of TC. In addition, fluorescence of the nanoprobe can change from yellow to red as the concentration of TC increases. Thus, naked eye detection of TC was realized using the test paper processed by nanoprobe, followed by RGB value analysis function on the mobile phone APP.
研究领域:
分析化学
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纳米技术
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环境科学
·
生物技术
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shuo Geng,Shu Min Lin,Shi Gang Liu,Wei Zhang,Nian Bing Li,Hong Qun Luo
We synthesized polyethyleneimine capped ZnO quantum dots (PEI-ZnO QDs) which dispersed well in ethanol by using a two-step method. UV–visible absorption spectroscopy, photoluminescence, Fourier transform infrared spectroscopy, high resolution transmission electron microscope, and field emission scanning electron microscope were used to characterize the as-prepared PEI-ZnO QDs. It emitted green-yellow fluorescence (527 nm) for excitation at 355 nm. We used the PEI-ZnO QDs to determine the alcoholic strength because of its different property in water and ethanol which caused decrease in the PEI-ZnO QDs fluorescence intensity with increasing water content. With this method, we determined the alcoholic strength of different artificial samples with a linear range from 20% to 60% vol and detected commercial spirits with satisfactory results.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 55
·50173-50179
·
IF 3.289
Song Li,Song Ye,Tianhua Liu,Zhuang Guo,Huiyun Wang,Deping Wang
ZnO quantum dots (QDs) with tunable size and photoluminescence can be achieved simply by controlling their growth during the sol–gel synthesis process. However, the role of alkali metal hydroxide MOH (M = Li, Na or K) as the reactant in the growth of ZnO QDs is still controversial. In this work, we carried out a comprehensive study on the growth of ZnO QDs by using different types of MOH as the reactant under different reaction temperatures and in different solvents. The results reveal that the growth of ZnO QDs is considerably governed by MOH through the co-effect of OH− and M+ ions, which can facilitate and hinder the growth, respectively. Further investigations suggest that the hindering effect caused by M+ cations is strongly dependent on the amount of OH− anions around the ZnO QD surface and follows the trend of Li+ > Na+ > K+. Moreover, the dual role of the reactant MOH can also be confirmed when altering reaction temperature and solvent. The photoluminescence of ZnO QDs shows size-dependence and can be easily tuned over a wide range from purple to yellow via adjusting the reaction parameters. This research establishes a fundamental understanding on the growth of ZnO QDs from the role of the reactant MOH point of view, which may benefit the controllable growth of ZnO QDs.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 12
·124003
·
IF 2.07
Xinli Wang,Jin Li
Doping is an effective functional modification method for improving the optical, electrical, and magnetic properties of semiconductors. Here, Cd-doped wurtzite ZnO-quantum-dot (ZQ) zero-dimensional nanomaterials were successfully prepared via liquid-phase synthesis. The experimental results showed that Cd doping can effectively shorten the bandgap, where the optical bandgap range of Cd-doping photocatalysts were 3.31–3.36 eV; in particular, the Cd5-ZQ (Cd contents of 0.5 wt%) sample reduced the bandgap from 3.39 to 3.31 eV compared to that of pure ZQ. This is consistent with the experimental results, where the simulation calculation results indicated the bandgap reduced from 3.107 to 2.912 eV after introducing Cd. Photoluminescence spectroscopy results confirmed the Cd-ion dopants efficiently capture excited electrons and further prolongs the charge lifetime. The degradation of a methylene blue solution under simulated solar light irradiation revealed that the photocatalytic properties of Cd-ZQ nanomaterial with suitable dopant concentration (Cd content 0.5 wt%) was significantly better than those of pure ZQ. The underlying mechanism involves a synergistic effect, and a reasonable and convenient strategy for uprate performance is presented.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 37
·375001
·
IF 3.874
Yue Yang,Tong Zou,Rongjun Zhao,Yulin Kong,Linfeng Su,Dian Ma,Xuechun Xiao,Yude Wang
In this work, an efficient and stable fluorescent probe for Al3+ was established. The fluorescent probe based on the fluorescence 'turn-on' mode of zinc sulfide crystal composite zinc oxide quantum dots (ZnS/ZnO QDs). The ZnS/ZnO QDs were synthesized via two-step method using L-Cysteine (L-Cys) as a sulfur source and stabilizer. In the synthesis of ZnS/ZnO QDs, the fluorescence of zinc oxide quantum dots (ZnO QDs) decreased and its stability increased in aqueous solution after the addition of L-Cys. In addition, the as-synthesized ZnS/ZnO QDs shows fluorescent enhancement to Al3+. The ZnS/ZnO QDs based fluorescence 'turn-on' probe presented wide linear ranges (1 nM–8 μM and 8–100 μM). The availability of as-established sensing probe was also estimated by real water sample tests. Furthermore, the fluorescent enhancing mechanism was carried out by recording the fluorescent lifetime of samples, which might be related to the QDs dispersion and charge transfer weaken.
研究领域:
分析化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 26
·10282-10293
·
IF 8.262
Yidong Zhang,Baoping Lin,Junchuan Wang,Jiahui Tian,Ying Sun,Xueqin Zhang,Hong Yang
Currently, the development of two kinds of materials from a single precursor has been an important frontier in material synthesis. In this study, we have successfully fabricated a single precursor using metal–organic frameworks (MOFs) (zeolitic imidazolate framework, ZIF-8) and carbon nanotubes (CNTs). ZnO quantum dots (QDs)/carbon/CNTs and porous N-doped carbon/CNTs have been selectively synthesized from a single ZIF-8/CNTs template. When the two derived materials were used for supercapacitor electrodes, they showed high capacitance values (185 F g−1 g for ZnO QDs/carbon/CNTs at 0.5 A g−1 and 250 F g−1 g for porous N-doped carbon/CNTs at 1 A g−1, respectively). Further, an all-solid-state asymmetric supercapacitor (ASC) device using ZnO QDs/carbon/CNTs as the positive electrode and porous N-doped carbon/CNTs as the negative electrode was fabricated, and this device could reach a working potential of 1.7 V, delivering a maximum energy density of 23.6 W h kg−1 and a maximum power density of 16.9 kW kg−1, which are better than those of the ZnO-based symmetric or asymmetric supercapacitor devices.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 64
·e202201682
·
IF 5.02
Longbin Xian,Nanlin Zhang,Zufu Luo,Xiaolin Zhang,Chonglin Yuan,Xiuting Li
Graphical Cyclic voltammetry (CV) is employed to determine the band edges and trap states of ZnO QDs with different surface ligands. It is demonstrated that the ZnO QDs without surface ligands mainly have oxygen interstitial defects whilst the ZnO QDs covered with ligands contain oxygen vacancies. The electronic structure of quantum dots (QDs) including band edges and possible trap states is an important physical property for optoelectronic applications. The reliable determination of the energy levels of QDs remains a big challenge. Herein we employ cyclic voltammetry (CV) to determine the energy levels of three types of ZnO QDs with different surface ligands. Coupled with spectroscopic techniques, it is found that the onset potential of the first reductive wave is likely related to the conduction band edges while the first oxidative wave originates from the trap states. The determined specific energy levels in CV further demonstrates that the ZnO QDs without surface ligands mainly have oxygen interstitial defects whilst the ZnO QDs covered with ligands contain oxygen vacancies. The present electrochemical method offers a powerful and effective way to determine the energy levels of wide bandgap ZnO QDs, which will boost their device performance.
研究领域:
材料科学
·
电化学
·
半导体物理
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DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Xiao Huang,Chun Chen,Xinting Zhu,Xi Zheng,Sanhua Li,Xingquan Gong,Zuli Xiao,Nian Jiang,Cangyan Yu,Caixia Yi
Tyrosinase inhibitors could effectively limit the activity of tyrosinase in melanocytes to reduce the excessive synthesis and deposition of melanin. However, low skin permeability and lacking in targeting greatly restricted their application. Herein, ZnO quantum dots were synthesized by gel-sol method and grafted with BQ-788, which have been employed as transdermal and targeting carrier to delivery ellagic acid to melanocytes. Ellagic acid loaded ZnO quantum dots with the size distribution of around 9 nm could targetedly bind to melanocytes and enter the melanocytes by endocytosis within 1 h. The ellagic acid release behavior was controlled by the decreasing of pH via the rapid dissolution of ZnO. When the concentration of BQ-788/EA@ZnO was 12.5 μg/mL, the inhibition rate on tyrosinase activity and melanin deposition were up to 44.23 ± 4.97% and 37.50 ± 5.23%, respectively. In view of their good biocompatibility, they were of great potential in clinically external application for tyrosinase inhibition.
研究领域:
药学
·
生物医学工程
·
皮肤科学
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产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-8
·
IF 5.578
Li Shuying,Sun Zongzhao,Li Rui,Dong Minmin,Zhang Liyan,Qi Wei,Zhang Xuelin,Wang Hua
Multicolor ZnO quantum dots (QDs) were synthesized and further modified with hydrophobic hexadecyltrimethoxysilane (HDS) and then hydrophilic aminopropyltriethoxysilane (APS) bilayers, resulting in amine-functionalized ZnO@HDS@APS nanocomposites with tunable fluorescence from blue to green yellow. Systematic investigations verify that the resulting ZnO@HDS@APS could display extremely high stability in aqueous media and unexpectedly, dramatically-enhanced fluorescence intensities, which are about 10-fold higher than those of bare ZnO QDs. The feasibility of the as-prepared ZnO nanocomposites for blood, cell and tissue imaging was preliminarily demonstrated, promising the wide bio-applications for cell or tissue imaging, proteome analysis, drug delivery and molecular labeling.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 6
·45831
·
IF 1.86
Jing Zhang,Liqun Chen,Jiada Chen,Dan Wu,Jie Feng
We demonstrated an extremely facile way to fabricate inorganic–organic microgels with pH sensitivity and fluorescence. Aqueous dextran microgels are crosslinked by ZnO quantum dots (QDs). The ZnO@Dextran microgels were synthesized by simply mixing amino-modified ZnO (ZnO QDs) with carboxymethyl dextran (CMD) while stirring. The hybrid microgels showed an average diameter of ∼5 μm and strong fluorescence under ultraviolet (365 nm) irradiation. Up to 79.3 wt % of ZnO QDs were loaded into microgels. The ZnO QDs crosslinkage in the hybrid microgels structure enabled the microgels to degrade under mild acidic environment due to pH sensitivity of ZnO QDs. After loading of doxorubicin (Dox), the microgels were used as drug carriers for pH-controlled release of Dox. The degradation of the microgels and the release of loaded cargos could be monitored by detecting fluorescence intensity of the microgels. Moreover, owing to the cytotoxicity of ZnO QDs at their destination, drug-loaded ZnO@Dextran microgels can be used for synergistic therapy. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45831.
研究领域:
材料科学
·
生物医学工程
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）