SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2014
·
IF 2.129
Fang fei Liu,Ying Yu,Bi xia Lin,Xiao gang Hu,Yu juan Cao,Jian zhong Wu
Daminozide (B9) is a growth inhibitor with important regulatory roles in plant growth and development. Locating and quantifying B9-binding proteins in plant tissues will assist in investigating the mechanism behind the signal transduction of B9. In this study, red fluorescent Mn-doped CdTe quantum dots (CdTeMn QDs) were synthesized by a high-temperature hydrothermal process. Since CdTeMn QDs possess a maximum fluorescence emission peak at 610 nm, their fluorescence properties are more stable than those of CdTe QDs. A B9-CdTeMn probe was synthesized by coupling B9 with CdTeMn QDs. The fluorescence intensity of the probe is double that of CdTeMn QDs; its fluorescence stability is also superior under different ambient conditions. The probe retains the biological activity of B9 and is unaffected by interference from the green fluorescent protein present in plants. Therefore, we used this probe to label B9-binding proteins selectively in root tissue sections of mung bean seedlings. These proteins were observed predominantly on the surfaces of the cell membranes of the cortex and epidermal parenchyma.
研究领域:
植物学
·
分子生物学
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DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4648-4652
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IF 1.556
Li Yansheng,Wang Wenqian,Zhao Dan,Chen Peng,Du Hongwu,Wen Yongqiang,Zhang Xueji
In this manuscript, we demonstrate a novel, facile and environmentally friendly method to directly obtain CdTe/ZnSe core/shell QDs in the aqueous phase based on the method of epitaxial growth of ZnSe shells on CdTe cores. The ZnSe shell and the capping reagent glutathione of the CdTe/ZnSe
core/shell QDs greatly increased the biocompatibility and stability of the original CdTe cores. The optical property of the as-prepared CZ QDs could be controlled by precisely adjusting the size of CdTe cores, which showed broad emission spectra from 530 to 688 nm. The crystalline structure
of the CZ QDs was extensively characterized by XRD, TEM and HRTEM, etc. Furthermore, since there were several functional groups on glutathione molecules, the QDs could be potentially used for connecting other functional small molecules, biomolecules or nanoparticles. Such QDs have bright future
perspectives in the development biological and nanomedical fields.
研究领域:
纳米医学
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生物学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
·
IF 3.782
Hui Feng,Niu Tang,Songbai Zhang,Bo Liu,Qingyun Cai
A novel (CdS-Mn/MoS 2 /CdTe)-sensitized TiO 2 nanotube arrays (NTAs) photoelectrode has been prepared by electrodeposite, successive ionic layer adsorption and reaction (SILAR) coupled with hydrothermal method . When a ZnS layer was added on the top of CdS-Mn/MoS 2 /CdTe/TiO 2 , a notable red-shift and high absorption was observed in the visible light region. The photocurrent density (mA/cm 2 ) systematically increases from TiO 2 NTAs (0.43), CdTe/TiO 2 (1.09), MoS 2 /CdTe/TiO 2 (1.80), CdS-Mn/MoS 2 /CdTe/TiO 2 (2.40), to ZnS/CdS-Mn/MoS 2 /CdTe/TiO 2 (3.41) under visible light irradiation, due to the type-II semiconductor heterostructures comprising multiple components with a staggered band offset. Such a heterostructure possesses an enhanced photocatalytic performance towards degradation of organic contaminant, e.g. P-Nitrophenol (PNP) and Rhodamine B (RhB) .
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2023
·
IF 2.2
Li Junqian,Xiong Ao,Mao Bingshuang
Inorganic quantum dots (QDs) are used in color displays because of wide photo-absorption and controllable photoluminescence (PL) colors, but their PL stability may be low due to surface defects. To overcome it, we prepared CdTe QDs with different sizes (~ 3.8, 4.4 and 5.0 nm) and poly(glycidyl methacrylate) (PGMA)/CdTe composite films. An increased size of QDs made them emit the green, yellow and red light successively. With an increased PL emission wavelength, the films emitted bright light with various colors. Compared to QDs solutions, the composite films have the almost unchanged fluorescence emission wavelengths (536–612 nm) and high PL intensity. The latter has an improved PL stability under optical and thermal conditions. The green-emitting film maintains ~ 81% of PL intensity after 24 h of photo-irradiation as well as ~ 91% of PL intensity at 120 °C. The green and white light-emitting diode (LED) devices were prepared using composite films, and the fluorescent emissions with bright colors were acquired. This study provides a valuable guideline for preparing the polymer/inorganic quantum dot composite films used in the LED poster display screens with bright stable fluorescence emissions.
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
Progress in Natural Science-Materials International
·
2021
·
IF 3.607
Jiaojiao Zheng,Bing Bai,Qiumei Di,Zhuoli Jiang,Meng Xu,Jiatao Zhang
In II-VI group, the doping in CdTe nanocrystals (NCs) is more difficult than other chalcogenides. In this communication, CdTe nanocrystals containing Cu impurities were carefully synthesized based on controlled reverse cation exchange process between as-prepared Cu 7 Te 5 nanocubes and Cd 2+ ions. By well-defined Cu 7 Te 5 nanocubes, the obtained CdTe NCs kept the original morphology. The concentration of Cu impurities in CdTe NCs was controlled by the regulation such reverse cation exchange. Additionally, the regulation from band gap (BG) photoluminescence (PL) to the coexistence of the bandgap emission, dopant emission, and surface-state emission was realized. This tailoring from undoped to doped emission in the case of Cu impurities is helpful to study the Cu related doping in telluride NCs.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2011
·
IF 1.77
Shenguang Ge,Juanjuan Lu,Lei Ge,Mei Yan,Jinghua Yu
A novel procedure for the determination of deltmethrin (DM) is reported. The water-soluble CdTe quantum dots (QDs) and highly fluorescent silica molecularly imprinted nanospheres embedded CdTe QDs (CdTe–SiO 2 -MIPs) were prepared and characterized by fluorescence spectroscopy, UV–vis spectroscopy, TEM and IR. The fluorescence nanosensor based CdTe–SiO 2 -MIPs is developed. The possible quenching mechanism is discussed by DM. Under optimal conditions, the relative fluorescence intensity of CdTe–SiO 2 -MIPs decreased with increasing DM by a Stern–Volmer type equation in the concentration range of 0.5–35.0 μg mL −1 , the corresponding detection limit is 0.16 μg mL −1 . The developed sensor based on CdTe–SiO 2 -MIPs was applied to determine DM in fruit and vegetable samples.
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
AICHE JOURNAL
·
2015
·Vol. 62
·期 2
·580-588
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IF 2.748
Zhixing Zhao,Xiao-Qiao Wang,Luting Ling,Cai-Feng Wang,Su Chen
The bottleneck of large-scale production of semiconductor quantum dots (QDs) is how to solve heavy metal ions waste water and the rapid separation during industrial process. A facile strategy for fabricating CdTe@Ca(OH) 2 nanocrystals exhibiting both improved photoluminescence (PL) stability and prolonged PL lifetime via an economical coprecipitating technology is reported herein. The procedure on capping CdTe QDs into Ca(OH) 2 crystals can enable the products to be easily filtrating separation and the content of residual Cd 2+ filtrate solution to be reached to 0.238 ppm level. Also, fluorescent rod-like heterocrystals by addition of saturated CaCl 2 solution is constructed. CdTe@Ca(OH) 2 nanocrystals is utilized further as phosphor powders to construct white light emitting diode (WLED). The WLED presented, here, has good photoelectric properties with color rendering index of 82.4 at 350 mA, a color temperature of 4643 k, and Commission Internationale de L'Eclairage coordinate of (0.3548, 0.3532), belonging to the white gamut, showing great potential in industrial application. © 2015 American Institute of Chemical Engineers AIChE J , 62: 580–588, 2016
研究领域:
材料科学
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化学工程
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光学工程
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Jian Zhu,Zhu-Jun Zhao,Jian-Jun Li,Jun-Wu Zhao
Mercury ions-induced fluorescence quenching properties of CdTe quantum dots (QDs) have been studied using the fluorescence spectroscopic techniques. By using the hydrothermal method , the CdTe QDs with different particles sizes from 1.98 to 3.68 nm have been prepared, and the corresponding fluorescence emission wavelength is changed from 518 to 620 nm. The fluorescence of QDs is enhanced after linking Bovine serum albumin (BSA) onto the surface of the QDs. Experimental results show that the fluorescence intensity of BSA-coated CdTe QDs could be effectively quenched when Hg 2 + react with BSA-coated CdTe QDs. Interestingly, both the sensing sensitivity and selectivity of this fluorescence probe could be improved when the particle size of the QDs decreases. Thus the BSA-coated CdTe QDs with green fluorescence emission have better advantages than the BSA-coated CdTe QDs with red fluorescence for Hg 2 + detection. Interference experiment results indicate that the influence from other metal ions could be neglected in the detection, and the Hg 2 + could be specifically detected. By using this BSA-coated CdTe QDs-based fluorescence probe, the Hg 2 + could be detected with an ultra-low detection limit of nanomole level, and the linear range spans a scope from 0.001 to 1 μmol/L.
研究领域:
分析化学
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环境科学
·
生物医学
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DOI
高影响因子
Analytical Methods
·
2013
·Vol. 5
·期 13
·3228-3234
·
IF 1.855
Yizhong Shen,Shaopu Liu,Jian Wang,Dan Li,Youqiu He
A sensitive and simple method for the determination of ellagic acid (EA) was developed based on the fluorescence quenching effect of EA for glutathione (GSH)-capped CdTe quantum dots (QDs). Under optimum conditions, a good linear relationship was obtained from 0.3118 to 55.0 μg mL−1 with a correlation coefficient of 0.9983, and the detection limit (3σ/K) was 0.0936 μg mL−1. The fluorescence quenching mechanism has been proposed on the basis of electron transfer supported by ultraviolet-visible (UV-vis) absorption, fluorescence (FL) spectroscopy and the measurement of fluorescence lifetime. The method has been applied to the determination of EA in synthetic samples and fresh urine samples of healthy humans with satisfactory results. The proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation.
研究领域:
分析化学
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生物医学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 81
·77963-77967
·
IF 3.289
Jinhua Du,Shuhong Xu,Chunlei Wang,Jiangyong Pan,Jing Chen,Li Zhu,Changgui Lv,Yiping Cui
The first aqueous red CdTe QD-LED was fabricated with the structure of ITO/PEDOT:PSS/PVK/CdTe QDs/ZnO/Al. The device has been considered to be an advanced aqueous QD-LED, which demonstrated a turn-on voltage of about 5 V. Further, its current density and brightness would also reach 92 mA cm−2 and 58 cd m−2 at the voltage of 10 V. Moreover, we found that there were two essential factors for fabricating an aqueous QD-LED successfully: (1) adding wet agent to the QD solution, (2) removing the composite ions remaining in the QD solution. Meanwhile, the EL intensity of the aqueous QD-LEDs will perform better if the solution of QDs is acidic. These results offer a promising approach to the further development of aqueous QD-LEDs.
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 13
·4860-4866
·
IF 1.938
Xuanping Tan,Shaopu Liu,Yizhong Shen,Youqiu He,Yusha Liu,Jidong Yang
A sensitive and simple method for the determination of fleroxacin (FLO) was developed based on the changes of dual-wavelength fluorescence signals of glutathione (GSH)-capped CdTe quantum dots (QDs). Under optimum conditions, a linear calibration plot of the quenched fluorescence intensity at 555 nm against the concentration of FLO was observed in the range of 0.0262–35.0 μg mL−1 with a correlation coefficient (R) of 0.9992. Meanwhile, a linear calibration plot of the enhanced fluorescence intensity at 429 nm against the concentration of FLO was observed in the range of 0.1966–35.0 μg mL−1 with a correlation coefficient (R) of 0.9986. The corresponding detection limits (3σ/K) are 17.93 ng mL−1 at 555 nm and 59.58 ng mL−1 at 429 nm. In addition, a detailed reaction mechanism has also been proposed on the basis of electron transfer supported by ultraviolet-visible (UV-vis) absorption, fluorescence (FL) spectroscopy and the measurement of fluorescence lifetime. The method has been applied for the determination of FLO in pharmaceutical preparations with satisfactory results. The proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation.
研究领域:
分析化学
·
生物医学
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2015
·Vol. 25
·期 5
·1397-1402
·
IF 1.927
Cao Yujuan,Wei Jiongling,Wu Wei,Wang Song,Hu Xiaogang,Yu Ying
In the present work, the CdTe quantum dots were covalently conjugated with permethylated- β -cyclodextrin (OMe- β -CD) using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride as cross-linking reagent. The obtained functional quantum dots (OMe- β -CD/QDs) showed highly luminescent, water solubility and photostability as well as good inclusion ability to malachite green. A sensitive fluorescence method was developed for the analysis of malachite green in different samples. The good linearity was 2.0 × 10 −7 –1.0 × 10 −5 mol/L and the limit of detect was 1.7 × 10 −8 mol/L. The recoveries for three environmental water samples were 92.0–108.2 % with relative standard deviation (RSD) of 0.24–1.87 %, while the recovery for the fish sample was 94.3 % with RSD of 1.04 %. The results showed that the present method was sensitive and convenient to determine malachite green in complex samples.
The analytical mechanism of OMe-β-CD/QDs and its linear response to MG
研究领域:
分析化学
·
环境科学
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DOI
PubMed
高影响因子
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