Analytical Methods
·
2014
·Vol. 7
·期 4
·1395-1400
·
IF 1.938
Li Wang,Di Luo,Dongdong Qin,Duoliang Shan,Xiaoquan Lu
This paper reports the electrochemiluminescence (ECL) behavior of CdSe/ZnS with K2S2O8 as the coreactant. The effects of pH, K2S2O8 concentration, the duration of the reaction of 4-ATP with GCE and the duration of the reaction of 4-ATP/GCE with QDs on ECL intensity were studied in detail. A possible ECL reaction mechanism was then proposed. In addition, it was observed that the ECL intensity was efficiently quenched by trace amounts of heavy metal ion. Based on the quenching effect of Pb2+ upon the ECL of CdSe/ZnS QDs, a QDs-ECL sensor was constructed to detect Pb2+ in preserved duck egg. The sensor showed good reproducibility and stability.
研究领域:
分析化学
·
电化学
·
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 29
·3582-3588
·
IF 2.073
Jieying Li,Mao Mao,Feng Wu,Qiang Li,Luyao Wei,Lan Ma
In this study, highly fluorescent amino-functionalized CdSe/ZnS core/shell quantum dots (CdSe/ZnS QDs) coated with amphiphilic N-alkylated poly(ethyleneimine) have been synthesized and applied as fluorescent probes in lateral flow immunoassay (LFIA) strips for on-site determination of aflatoxin B1 (AFB1). The amino-functionalized QDs were used to combine with anti-AFB1 via thiol-maleimide conjugation and they effectively enhanced the detection sensitivity. The test strip had high sensitivity for AFB1 from 0.001 ng mL−1 to 10 ng mL−1 with a low limit of detection (LOD) of 0.005 ng mL−1, which was much lower than the allowable concentration by the European Commission (EC) (2.0 μg kg−1) and FDA (20 μg kg−1). The IC50 value was calculated to be 0.025 ng mL−1. The reproducibility and recovery tests showed that the quantitative results were accurate, and it could be used for rapid on-site detection of AFB1 in cereal products.
研究领域:
分析化学
·
食品安全
·
纳米技术
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2022
·期 4
·e202100944
·
IF 2.524
Yichang Lin,Sheng Liu
Graphical Photocathodic protection is promising to harvest solar light for corrosion protection of metals. Benefiting from a considerably enhanced absorption for visible light and a significantly increased transfer efficiency for photogenerated charges, the as-prepared ZnO/ZnSe/CdSe photoanode exhibits a superior photocathodic protection performance for the coupled 304 stainless steel under illumination. Photocathodic protection technology is emerging to harvest solar light for electrochemical corrosion protection of metals. Herein, ZnO/ZnSe/CdSe heterostructured nanowire arrays were synthesized on conductive glass substrates by a two-step ion-exchange reaction in ZnO nanowire arrays. The as-prepared ZnO/ZnSe/CdSe core/shell nanostructure was unveiled by XRD, SEM, TEM, EDAX elemental mapping, and XPS analyses. The ZnO/ZnSe/CdSe ternary heterojunction photoanode exhibits a considerably enhanced absorption for visible light and a significantly increased separation, transfer, and collection efficiencies for photogenerated charges. When working as photoanodes, the as-deigned ZnO/ZnSe/CdSe heterostructured nanowire arrays demonstrates a superior photocathodic protection performance for the coupled 304 stainless steel under illumination with AM 1.5G.
研究领域:
材料科学
·
纳米技术
·
电化学
·
腐蚀防护
·
可再生能源
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·1-8
·
IF 2.7
Wang Dongyang,Zou Wenhua,Chen Yexin,Duan Junhong
In this work, different percentages of Eu-doped TiO 2 nanoparticles were synthesized by sol–gel method. The bandgap and conduction band minimum (CBM) of TiO 2 nanoparticles doped by 0.075 at% Eu element is reduced from 3.43 and – 3.93 eV to 3.09 and – 4.25 eV, respectively, deduced from the results of ultraviolet–visible (UV–Vis) absorption spectroscopy and ultraviolet photoelectron spectroscopy (UPS) measurement compared with un-doped TiO 2 . As the increase of Eu concentration, short-circuit photocurrent density J sc of CdSe quantum dot-sensitized solar cells (QDSCs) increases from 10.86 to 13.86 mA/cm 2 , while open-circuit voltage V oc is almost invariable. Optimal power conversion efficiency (PCE) of 4.03% is achieved for CdSe QDSCs with 0.075 at% Eu-doped TiO 2 film. Compared with un-doped devices, the decrease of the chemical capacitance C μ and the increase of recombination resistance R rec of QDSCs based on the 0.075 at% Eu-doped TiO 2 photoanodes can facilitate charge extraction and suppress charge recombination at the TiO 2 /electrolyte interface.
研究领域:
光伏技术
·
纳米材料
·
半导体物理
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lin Wang,Jing Han,Yijiang Wu,Yaping Zhang,Qiang Zhang,Xuejiao Tan,Yingzi Yang,Weibing Li,Yuyu Bu,Jin-Ping Ao
In this paper, a ZnSe layer was formed by in-situ conversion on the surface of ZnO nanorod array, and then CdSe layer was transformed from the ZnSe layer by ion exchange method. Subsequently, a p-type poly 3,4-ethylenedioxythiophene (PEDOT) ultrathin conductive layer was deposited on the surface of CdSe by multi-current step deposition method. The separation and transmission processes of the photogenerated carriers were studied by analyzing the results of electrochemical impedance spectroscopy (EIS) and intensity modulated photocurrent/photovoltage spectroscopy (CIMPS/CIMVS). The in-situ growth method could reduce the interface barrier between ZnO and CdSe and optimize the interface exchange process of the photogenerated charge carriers. Meanwhile, the p-n junction constructed between PEDOT and CdSe layer could improve the separation efficiency of the photogenerated charge carriers. Therefore, PEDOT layer significantly promote the photoelectrochemical performance by passivating the surface state of CdSe and suppressing the secondary recombination of the photogenerated charge carriers.
研究领域:
材料科学
·
光电化学
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Linxi Wang,Xudong Qian,Yang Ren,Hairui Lei,Xiaofei Hu,Dongdong Chen,Jiongzhao Li,Xiaogang Peng
The CdS shells are epitaxially grown onto monodisperse zinc-blende CdSe core nanocrystals in octadecene mixed with fatty amines, with the volume fraction of fatty amines in the epitaxy solution (VNH2) varying between 0 and 100%. The shape─except the nanoplatelets from the reactions with medium VNH2 (especially 20% VNH2)─and surface ligands of the resulting CdSe/CdS core/shell nanocrystals from all reactions can be unified through a two-step surface treatment. The internal lattice defects originated from zinc-blende/wurtzite stacking fault(s), i.e., wurtzite lattice domain(s) in the CdS shells and twin fault(s) in the zinc-blende region, can be systematically controlled by varying the VNH2 and remain unaltered during the surface treatments. Both twin faults and wurtzite CdS lattice domains neither affect the electronic structure of the core/shell nanocrystals nor create internal electronic defects for the nanocrystals. Photoluminescence decay dynamics of the dot-shaped core/shell nanocrystals with solely twin faults can be mono-exponential and near-unity radiative decay, but photoluminescence of those with wurtzite CdS domains would always decay with double-exponential even if the photoluminescence quantum yield is unity. The results here imply that the most common lattice defects related to the stacking faults for II–VI and III–V semiconductor nanocrystals can be managed for achieving high-quality optical properties.
研究领域:
材料科学
·
纳米技术
·
半导体物理
·
光学性质
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Liang Li,Chao-qun Wu,Zhi-xuan Zhang,Nan Zhang,Ting Huang,Yong Wang
The rapid development of modern industry has exacerbated water pollution, posing significant threats to environmental sustainability and human health. Semiconductor heterostructures have emerged as a promising strategy to enhance the photochemical properties and catalytic activity of heterogeneous catalysts, offering a viable solution to water pollution challenges. In this study, a series of CeO2/CdSe catalysts was successfully synthesized via chemical deposition. The results demonstrate that CdSe nanoparticles could effectively modulate the band gap, enhance visible light absorption ability, and improve the photochemical performance of CeO2/CdSe composites. The catalytic activity and practical application prospects of the as-synthesized samples were evaluated by reducing hexavalent chromium (Cr(VI)) and decomposing tetracycline hydrochloride (TCH). CeO2/CdSe composites exhibited significantly higher photocatalytic activities compared to pure CdSe and CeO2. Notably, CeO2/0.6CdSe demonstrated the highest photocatalytic activity, achieving 93.6% removal of Cr(VI), which was 4.39 and 1.77 times as high as those of pure CeO2 and CdSe in sequence. Furthermore, CeO2/0.6CdSe achieved a remarkable TCH removal rate of 97.0%. The enhanced photocatalytic performance of CeO2/0.6CdSe is attributed to the formation of heterojunction structures between CdSe and CeO2, which facilitates efficient charge separation and transfer. Cyclic experiments confirmed the excellent anti-interference ability and sustainability of CeO2/0.6CdSe. Reduction mechanisms of Cr(VI) and degradation mechanisms of TCH were thoroughly investigated, with DFT mechanistic analysis providing further insights into the superior catalytic activity of CeO2/0.6CdSe. This work highlights the potential of CeO2/0.6CdSe as a highly efficient photocatalyst with broad applications in wastewater treatment.
研究领域:
环境科学
·
材料化学
·
纳米技术
·
光催化
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 1
·1-10
·
IF 5.479
Wen Shao-Hua,Liang Ru-Ping,Zeng Hui-Hui,Zhang Li,Qiu Jian-Ding
A ratiometric fluorometric method is described for the determination of arsenate via its inhibitory effect on the activity of the enzyme acid phosphatase. A nanoprobe was designed that consists of CdSe/ZnS quantum dots (QDs) coated with the terbium(III) complex of guanosine monophosphate (Tb-GMP). The nanoprobe was synthesized from carboxylated QDs, Tb(III) and GMP via binding of Tb(III) by both the carboxy and the phosphate groups. The nanoprobe, under single-wavelength excitation (at 280 nm), displays dual (red and green) emission, with peaks at around 652 nm from the QDs, and at 547 nm from the Tb-GMP coordination polymers. It is shown to be a viable nanoprobe for fluorometric determination of As(V) detection through it inhibitory action on the activity of acid phosphatase (ACP). The enzyme destroys the Tb-GMP structure via hydrolysis of GMP, and hence the fluorescence of the Tb-GMP complex is quenched. In contrast, the fluorescence of the CdSe/ZnS QDs remains inert to ACP. It therefore can serve as an internal reference signal. In the presence of arsenate (an analog of phosphate), the activity of ACP is inhibited due to competitive binding. Thus, hydrolysis of GMP is prevented. These findings were used to design a ratiometric fluorometric method for the quantification of As(V). The ratio of fluorescences at 547 and 652 nm increases linearly in the 0.5 to 200 ppb As(V) concentation range, and the limit of detection is 0.39 ppb. Under a UV lamp, the probe shows distinguishable color from green to red on increasing the concentration of As(V).
Schematic illustration of CdSe/ZnS quantum dot coated with carboxy-PEG and modified with the terbium(III)-GMP complex as a fluorescent nanoprobe for ratiometric determination of arsenate via its inhibition of ACP activity.
研究领域:
生物化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Progress in Natural Science-Materials International
·
2022
·
IF 4.269
Xue Li,Jinhua Li,Wentao Yang,Dandan Han,Na Yao,Hongbin Zhao,Xueying Chu,Xuemei Liang,Chunguang Bi,Chunfeng Wang,Guilian Yang
An ultrasensitive and selective sandwich-type fluorescent immunosensor based on fluorescence resonance energy transfer (FRET) between CdSe/ZnS quantum dots (QDs) and Au nanorods (AuNRs) was developed for the rapid detection of porcine reproductive and respiratory syndrome virus (PRRSV). Modified CdSe/ZnS QDs and AuNRs were bioconjugated with primary antibodies M and GP5, respectively. When the target antigen was present, a well-known sandwich-type form CdSe/ZnS QDs-M antibody-antigen-GP5 antibody-AuNRs was produced, and thus reducing the distance between the QDs and NRs. As a result, FRET occurred and the fluorescence intensity of CdSe/ZnS QDs decreased, and this decrease was used to determine the antigen concentration. Ultrasensitive detection of PRRSV at low concentrations in swine serum was achieved with a limit of detection of 0.55 TCID 50 /mL and a linear detection range of 10 1 –3.5 × 10 4 TCID 50 /mL. Therefore, the fluorescent immunosensor is selective and highly sensitive; specifically, it can detect PRRSV at low concentrations in swine serum over a large concentration range. This proposed detection method can facilitate the development of high-performance fluorescent immunosensors for the detection of PRRSV and other antigens.
研究领域:
生物传感器
·
纳米技术
·
病毒学
·
兽医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 17
·22024-22034
·
IF 2.478
Li Hong,Jiao Jinxu,Ye Qi,Wu Zhixin,Luo Donglian,Xiong Dehua
Quantum dots (QDs) attract extensive attention because of their excellent optoelectronic performance. However, few research has been done on the synthesis of core–shell QDs by one-step thermal injection. Here the CdSe/ZnS core–shell QDs were successfully synthesized by a one-step thermal injection method. The synthesis process of CdSe/ZnS core–shell QDs was investigated from two aspects of reaction time and oleic acid dosage. The results suggest that the reaction time and the dosage of oleic acid have important effects on the optical properties of CdSe/ZnS core–shell QDs. The action mechanism of oleic acid was also explained in this paper. Moreover, highly efficient green quantum dot light-emitting diodes (QLEDs) were fabricated with CdSe/ZnS core–shell QDs on ITO glass substrate by rotary coating method. The minimum starting voltage of 1.91 V and the maximum brightness of 12,057 cd m −2 were achieved in the QLEDs. This study is of great significance for the development of the synthesis of core–shell QDs by one-step thermal injection and QLEDs.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
半导体物理
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 26
·2200725
·
IF 29.698
Kanghua Li,Xuke Yang,Yue Lu,Jiayou Xue,Shuaicheng Lu,Jiajia Zheng,Chao Chen,Jiang Tang
Silicon-based tandem solar cells are regarded as one of the most feasible ways to break the single-junction Shockley–Queisser limit efficiency and further reduce the cost of solar electricity. Recently, wide-bandgap ( ≈ 1.7 eV) perovskite solar cells have drawn intense research interest as the top cell for Si-based tandem devices. Despite significant progress in device efficiency, the unsatisfactory stability of perovskites is still a huge concern. Besides halide perovskites, there are many inorganic semiconductors worthy of investigation. It is believed that cadmium selenide, a binary compound enjoying outstanding optoelectronic properties, high stability, and low cost, is very promising as the top cell for Si-based tandem devices. Herein, the CdSe thin-film solar cells that have been neglected for 3 decades are revisited. Using rapid thermal evaporation, high-quality CdSe thin films with large grain size, high-photoluminescence, small Stokes shift, and intrinsic n-type conductivity are obtained. Furthermore, CdSe solar cells are redesigned and a champion efficiency of 6.00% is achieved. Through in-depth analysis, it is identified that bulk and interface defects limit the open-circuit voltage and hence device performance. This work highlights the great potential of CdSe solar cells as top cells for Si-based tandem devices.
研究领域:
光伏技术
·
材料科学
·
半导体器件
·
可再生能源
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Xiaowei Li,Ruixue Chen,Huidong Sui,Xiaoxian Yuan,Meng Li,Kun Yang,Ling Li,Wenming Zhang,Yucang Zhang
Flower-like NiO nanoparticles was successfully synthetized by homogeneous precipitation. A novelty modified (CH 3 ) 4 N) 2 S/((CH 3 ) 4 N) 2 S n electrolyte was introduced in solar cell successfully and NiS was used as the counter electrode. Moreover, CdSe sensitized p-type NiO was synthesized by chemical bath deposition (CBD) in a precursor solution to ensure the nanosized flower-like NiO films obtain a better uniformity and high penetration. Meanwhile, a series of parallel experiment were designed to investigate the effect of different CdSe deposition layers on the photoelectric characteristic of the cell. The result showed that when the film was eight layers, the maximum efficiency of 1.06% had been achieved, with a significantly open circuit voltage ( V oc ) of 0.755 V, a fill factor (ff) of 0.27% and a short circuit current density ( J sc ) of 5.21 mA cm −2 .
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
电化学
✓ 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）