INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Zexiao Zheng,Xukai Li,Laisheng Li,Yiming Tang
Quaternary semiconductor film consists of ZnO, ZnSe, CdSe and MoS 2 was designed to establish a core-shell structure to achieve the photoelectrochemical oxidation of amoxicillin . The hybrid photoelectrode was fabricated on a FTO substrate from bath deposition methods . The hierarchical ZnSe/CdSe/MoS 2 shell was covered uniformly on ZnO nanorod core which provided a direct pathway for electron transfer , large surface area to enhance light absorption and increase active sites. The quaternary photoelectrode exhibited a photocurrent density of 26.86 mA/cm 2 at 0 V vs. Ag/AgCl under UV–visible light illumination, which was 31.9 times, 16.7 times and 1.6 times of that of the bare ZnO nanorods, binary ZnO/ZnSe and ternary ZnO/ZnSe/CdSe photoelectrodes, respectively. 10 ppm of amoxicillin was completely degraded in 30 min by the quaternary working electrode with an applied bias of 0.5 V vs. Ag/AgCl. The reusability and stability of quaternary electrode was demonstrated by 3-run recycling experiments. The enhanced photoelectrochemical performance of quaternary photoelectrode can be attributed to the enhancement of light absorption and increased active sites from the coverage of visible-active layers, the accelerated charge separation from the formation of p-n junction and reduced photocorrosion of CdSe from the protection of MoS 2 on the surface.
研究领域:
环境科学
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材料科学
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Ying Wang,Jiaru Peng,Yangfan Xu,Ruiyang Zhao,Jishu Han,Lei Wang
Photocatalytic water splitting to produce hydrogen has attracted extensive attention and exhibited broad development prospects. In this work, CuInS 2 microflowers were fabricated through the solvothermal method , and decorated with CdSe quantum dots on the surface. As-prepared CdSe/CuInS 2 microflowers exhibited high photocatalytic hydrogen production activity (10610.37 μmol g −1 h −1 ) and high AQE of 48.97% at 420 nm. The enhanced photocatalytic hydrogen production activity owing to the construction of p-n heterostructure improved light absorption ability, increased electrons transfer efficiency and reduced recombination of photo-induced electrons and holes. Moreover, high stability and cyclic utilization of CdSe/CuInS 2 microflowers were beneficial to photocatalytic hydrogen production application.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 48
·期 3
·1067-1074
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IF 4.099
Feifei Mei,Jinfeng Zhang,Kai Dai,Guangping Zhu,Changhao Liang
Recently, cadmium selenide (CdSe) has been deeply studied because of its excellent photocatalytic hydrogen (H2) production performance. However, pure CdSe has poor stability and severe photocorrosion, which seriously affect its application prospect. In this work, we successfully deposit Bi2MoO6 on an inorganic–organic CdSe-diethylenetriamine (DETA) hybrid to design Bi2MoO6/CdSe-DETA composites by an in situ solvothermal method. The morphology, crystal structure, electrochemical properties, H2 evolution performance and the photostability of Bi2MoO6/CdSe-DETA composites are explored using various techniques. The results show that the as-prepared Bi2MoO6/CdSe-DETA composites exhibit excellent photocatalytic performance and photostability under visible light irradiation. Among them, the Bi2MoO6/CdSe-DETA hybrid system exhibits excellent photocatalytic H2 production performance (5.92 mmol g−1 h−1), which is approximately 3.6 and 1.8 times higher than that of pure CdSe and CdSe-DETA, respectively. After 4 cycles, the photocatalyst still maintains high H2 production. This study develops a new type of photocatalyst that can respond to visible light. This provides an effective way to solve the energy problem by using solar energy.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Zhen-Hao Tian,Meng Shao,Xin-Yu Zhao,Yu-Jun Wang,Ke Wang,Jian-Hong Xu
Morphology control of CdSe nanoparticles was essential for their potential applications. Different shapes of CdSe nanoparticles could be synthesized in flask reactors. However, there were few researches using microreactors to control the morphologies of CdSe nanoparticles. In this article, a microfluidic approach was developed to synthesize anisotropic CdSe nanoparticles. The nucleation stage (or seed preparation stage) and crystal growth stage were separated, and PFPE was used to form segmented microreactors for the growth stage. The influence of different conditions, such as nucleation temperatures, crystal seeds concentration, the overall ratio of Cd to Se, and monomer concentration for growth stage, on the shape control of CdSe nanoparticles was studied. Branched shape CdSe nanoparticles with high monodispersity were obtained.
研究领域:
材料科学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yangfan Xu,Yue Han,Ruiyang Zhao,Jishu Han,Lei Wang
Photocatalytic hydrogen production technology from water is a more effective and promising method to solve energy and environmental crises. In this work, flowerlike CaMoO4 microspheres were successfully synthesized by an ultrasonic precipitation method and modified with variable concentrations of CdSe NCs. CdSe/CaMoO4 microspheres showed increased light absorption ability, larger relative surface area, lower electrochemical impedance, and longer fluorescence lifetime. The photocatalytic hydrogen production rate of CdSe/CaMoO4 microspheres could reach up to 10 162.33 μmol g–1 h–1. The constructed type-I heterostructure improved the separation of photogenerated electrons and inhibited the rapid recombination of photogenerated electrons and holes, thus enhancing the photocatalytic hydrogen production performance. CdSe/CaMoO4 with high hydrogen production activity would be an efficient photocatalyst for hydrogen production applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2012
·
IF 3.898
Xuelin Fang,Min Han,Guofei Lu,Wenwen Tu,Zhihui Dai
A competitive immunosensor using CdSe quantum dots (QDs) as a label was highly proposed for the detection of a tumor marker. CdSe QDs were characterized by transmission electron microscope image, photoluminescence spectra and ultraviolet–visible absorption spectra. The fabrication process of the immunosensor was traced with electrochemical impedance spectra. Using α-fetoprotein (AFP) as a model, a simple electrochemiluminescence immunosensing platform based on CdSe QDs using competitive binding between conjugated antibody-CdSe QDs and free AFP with immobilized AFP on Au electrode was developed. Under the optimum conditions, the proposed electrochemiluminescence method could detect AFP ranging from 0.05 to 100 μg/L with a detection limit of 0.005 μg/L. The proposed immunosensor showed good analytical performance and was successfully applied to detecting level of AFP in human serum samples, which would provide a new and promising direction for clinical application.
研究领域:
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2011
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IF 1.304
Huirui Zhou,Ke Tao,Yunqi Sui,Kang Sun
The heterogeneous nucleation and growth of CdSe domains on the Fe 3 O 4 seed nanocrystals are hard to be controlled because of significant lattice mismatch between Fe 3 O 4 and CdSe nanocrystals. Current study exploits the choice of surface ligand and crystal morphology for Fe 3 O 4 seed to investigate ways to overcome the energy barrier imposed by the lattice mismatch for the promotion and control of subsequent growth of CdSe nanocrystals on seeded crystals. Results indicate that the growth of CdSe domains on seed nanocrystals not only depends on the affinity of ligands toward seed nanocrystals, but also is affected by the seed ligands in a similar way to synthesizing individual second-domain nanocrystals. Furthermore, preferential growth of CdSe domains on the corner of cubic seeds are observed, and cubic Fe 3 O 4 nanocrystals are favored for the heterogeneous nucleation of CdSe as opposed to spherical ones. A three-stage growth model (heterostructures formation, the adsorption of Se and the heterogeneous nucleation and growth) is proposed, where choice of ligands, geometry features, such as surface curvature and defects are found to have significant impact to overcome energy barrier from lattice mismatch.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Wang Jing,Peng Xiao,Li Daquan,Jiang Xiaochun,Pan Zaifa,Chen Aimin,Huang Liang,Hu Jun
A dually emitting quantum dot nanohybrid was designed for the fluorometric 2-wavelength determination of ascorbic acid (AA). The nanohybrid consists of red-emitting CdTe quantum dots (QDs) covalently linked to the surface of silica nanoparticles containing green-emitting CdSe QDs. The fluorescence of the red-emitting CdTe QDs (peaking at 616 nm) is first quenched by addition of KMnO 4 due to oxidation under formation of CdTeO 3 and TeO 2 . On addition of AA, the red fluorescence is restored due to the reduction of surface CdTeO 3 /TeO 2 to form CdTe. The green fluorescence of the green-emitting CdSe QDs (peaking at 522 nm), in contrast, remains constant and its intensity serves as a reference signal. Both kinds of QDs can be photoexcited at 380 nm. An easily distinguishable transition in fluorescence (from green to orange-red) can be observed on increasing the amount of added AA. Under optimal conditions, the ratio of the intensities of the red and the green fluorescence increases linearly in the 0.1 to 5.0 μM AA concentration range, and the detection limit is as low as 35 nM. The assay was successfully applied to the quantitation of AA in (spiked) fruit juice samples.
A new dually emitting CdSe@SiO 2 @CdTe nanohybrid was designed for ratiometric ultrasensitive fluorometric detection of ascorbic acid in fruit juice samples.
研究领域:
分析化学
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纳米技术
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Yongze Xie,Min Zhang,Qianyun Bin,Shilei Xie,Lu'an Guo,Faliang Cheng,Weizhong Lv
The fast and accurate detection of Carcinoembryonic Antigen (CEA) plays an important role in clinical cancer treatment and therapy. An ultrasensitive photoelectrochemical (PEC) immunosensor for the detection of CEA was constructed using CdSe@BiVO 4 co-sensitized TiO 2 nanorods as photoactive materials. TiO 2 nanorods were assembled on the FTO modified electrode to immobilize capture antibodies. With a sandwich immunoassay format, CEA and signal antibodies labelled CdSe@BiVO 4 were introduced in sequence via specific immunoreaction, and the ultrahigh sensitivity of this immunoassay results from the following three aspects. Firstly, the co-sensitization of BiVO 4 and CdSe extends the absorption range of TiO 2 from ultraviolet region to visible light region, which can adequately utilize the light energy; Secondly, the effective matching of energy levels among TiO 2 , CdSe and BiVO 4 accelerates the separation and transfer of photogenerated electron-hole pairs and significantly improves the PEC performance; Finally, the introduced Au evidently expedites the interfacial electron transfer from TiO 2 to FTO electrode, further resulting in noticeably increased photocurrent . Based on multiple signal amplification strategy, a largely linear detection range from 0.01 ng mL −1 to 50 ng mL −1 with a low detection limit (0.5 pg mL −1 ) were obtained. In addition, the prepared immunosensor with attractive properties provides a promising platform for PEC detection.
研究领域:
生物医学工程
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肿瘤学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Rujing Ban,Zhengyan Xu,Yang Yang,Dayong Fan,Huidan Lu,Yongping Liu
This work synthesized ultrathin 2D CdSe nanosheets by a facile solvothermal method. The morphology, structure, composition, and thermal stability of the samples were studied and analyzed using transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), infrared spectra (IR), and thermogravimetric (TG) methods. Results demonstrated that stable wurtzite-structured CdSe nanosheets with 2-3 nm thickness were successfully fabricated. UV-Vis absorption spectroscopy (UV-Vis) and fluorescence spectroscopy analysis exhibited the characteristic absorption peaks and fluorescence emission peaks of CdSe nanosheets with narrow full-width half-maximums (fwhm) and slight Stokes shift, implying ultrathin structure. Photoelectrochemical (PEC) measurement declared a fast and stable photo-response for the as-prepared CdSe ultrathin nanosheets. With the reaction temperature increasing, the PEC activity enhanced due to the decreased nanosheets thickness. This paper provides a new route for the synthesis of CdSe ultrathin nanosheets and their application in the field of photoelectrochemical catalysis.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Ying Yang,Zheng Yuan,Xing-Pei Liu,Qiao Liu,Chang-Jie Mao,He-Lin Niu,Bao-Kang Jin,Sheng-Yi Zhang
The detection and speciation analysis of metal-ion is very important for environmental monitoring. A novel electrochemical biosensor for Nickel(II) detection based on a DNAzyme-CdSe nanocomposite was developed. We firstly hybridized with capture probe (DNA1) and sequentially with DNA (DNA2) on the gold electrode. Then CdSe QDs were incorporated the specific recognition of DNA2 by covalent assembling. Upon addition of nickel ion into the above system, the substrate strand of the immobilized DNAzyme was catalytically cleaved by target Ni 2+ , resulting in disassociation of the shorter DNA fragments containing CdSe QDs. The remaining CdSe QDs on the electrode surface detected by differential pulse anodic stripping voltammetry (DPASV). Under optimal conditions, the as-prepared sensor exhibited high sensitivity and fast response to Ni 2+ with the linear range from 20 nM to 0.2 mM and a low detection limit of 6.67 nM. The prepared biosensor also shows good stability and good reproducibility and high selectivity toward target Ni 2+ against other metal ions because of highly specific Ni 2+ -dependent DNAzyme. Thus, our strategy has a good potential in the environment surveys.
研究领域:
环境科学
·
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wenqian Luan,Yuye Yan,Jianxiang Wang,Yingxia Zong,Ruiyang Zhao,Jishu Han,Lei Wang
Conversion of water into renewable hydrogen energy using solar energy is one of the ideal methods to address the current environmental pollution and increasing energy demand. Thus developing the photocatalyst with high efficiency, stability, and a low electron-hole recombination rate becomes very important. In this paper, Zn 3 In 2 S 6 microspheres were synthesized by hydrothermal method, and then In-doped CdSe nanoparticles were loaded on the surface of Zn 3 In 2 S 6 microspheres to form Cd 0.9 In 0.1 Se/Zn 3 In 2 S 6 type II heterojunction. Under simulated sunlight irradiation, the photocatalytic hydrogen production of Cd 0.9 In 0.1 Se/Zn 3 In 2 S 6 reached 11.41 mmol h −1 g −1 , which was 4.61 times and 1.97 times that of Cd 0.9 In 0.1 Se and Zn 3 In 2 S 6 , respectively. The experimental results showed that the formation of type II heterojunction could improve the photocatalytic hydrogen production efficiency by shortening the charge transport distance and inhibiting the recombination of electron-hole pairs. This work will provide new ideas and insights for the development of photocatalytic hydrogen production technology.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
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