TALANTA
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2020
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IF 5.339
Yixin Liu,Binxiao Li,Yuanyuan Yao,Beibei Yang,Tongtong Tian,Yan Miao,Baohong Liu
An electrochemiluminescence (ECL) resonance energy transfer system is constructed for 17β-estradiol (E2) detection using α [email protected] nanospheres as the ECL-active substrates and Ag NCs as an efficient quencher. CdS QDs loaded onto three-dimensional (3D) urchin-like α-FeOOH nanospheres (α [email protected] nanospheres) exhibited excellent ECL responses, which is attributed to dual-amplification of α-FeOOH frameworks. The 3D hierarchical structure of the α-FeOOH nanospheres provided abundant sites for loading ECL-active species, thus significantly improving the ECL performance of substrates; While Fe 3+ presented on surface of α-FeOOH nanospheres could be reduced to Fe 2+ in negative potentials, after which might activate persulfate in a Fenton-like process, resulting in more sulfate free radicals for more effective ECL responses via electron transfer reactions. Additionally, Ag nanoclusters (Ag NCs) stabilized by single stranded oligonucleotide were introduced as quenching probes for CdS QDs owing to the well-matched donor-acceptor spectrum for efficient energy transfer, which makes them appropriate for detection of E2. The proposed strategy displayed a desirable dynamic range from 0.01 to 10 pg mL −1 with a limit of detection of 0.003 pg mL −1 . The proposed strategy based on the ECL-RET strategy offered an ideal way for E2 detection, and also revealed an alternative platform for detection of other small molecules.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Changlin Li,Shangrong Chen,Xiangxiang Gao,Wei Zhang,Yanfang Wang
The photoelectrochemical (PEC) performance of ZnO is restricted by its low light absorption ability and high recombination rate of photogenerated carriers. In order to overcome these drawbacks, ZnO/CdS/CdSe heterostructures are prepared on Zn foil substrate using facile three-step methods containing hydrothermal growth, successive ionic layer adsorption reaction (SILAR) and modified chemical bath deposition (CBD). The effects of process parameters containing the number of SILAR cycles of CdS, sensitization sequence of CdS and CdSe, and precursors of CdSe on PEC performance of ZnO/CdS/CdSe heterostructures, and ZnO NRAs on PEC performance of CdS/CdSe co-sensitizer have been scrutinized. Through CdS and CdSe co-sensitization, a layer of CdS/CdSe nanofilm is conformally deposited on ZnO nanorod arrays (NRAs) observed by transmission electron microscopy (TEM). Both the visible-light absorption ability and separation efficiency of photogenerated carriers of ZnO NRAs are significantly enhanced evidenced by UV–vis diffuse reflectance absorption spectra , photoluminescence (PL) spectra and electrochemical impedance spectra. Due to the synergistic effect of ZnO NRAs and CdS/CdSe co-sensitizer, the ZnO/CdS/CdSe heterostructures with five SILAR cycles and one modified CBD cycle (ZnO-CdS5-CdSe) show efficient PEC properties with photocurrent density of 6.244 mA/cm 2 at −0.2 V vs Ag/AgCl under light illumination of 100 mW/cm 2 , which are 57.28 and 4.73 times higher than those of pristine ZnO NRAs and CdS/CdSe clusters, respectively. Moreover, the photoconversion efficiency and incident photon to current conversion efficiency (IPCE) of the ZnO-CdS5-CdSe photoanode reach 4.381% and 80.92%, respectively. The heterostructures based on Zn foil substrate in this study can be a promising candidate for practical PEC application and other applications such as photocatalytic degradation and solar cell due to its low manufacturing cost, large-scale production and efficient PEC ability.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Jianhui Liu,Peipei Chen,Fangquan Xia,Zhen Liu,Hanbiao Liu,Jiangle Yi,Changli Zhou
A "signal on" aptasensor was fabricated for chlorpyrifos detection by a highly efficient electrochemiluminescence resonance energy transfer (ECL-RET) strategy between MoS 2 /CdS nanospheres and silver/carbon quantum dots (Ag/CQDs). Compared with the conventional MoS 2 /CdS nanosheets, the MoS 2 /CdS nanospheres have a larger specific surface area and electron density, which makes the catalytic effect on K 2 S 2 O 8 stronger and has higher luminescence intensity. As a receptor, through the synergistic effect of Ag NPs and CQDs, it has a very wide absorption band between 300 and 600 nm. The absorption band and the emission spectrum of MoS 2 /CdS completely overlap, and the high quantum yield of Ag/CQDs can achieve efficient energy resonance transfer. The proposed ECL aptasensor provided a linear range from 10 nM to 1.0 fM for chlorpyrifos detection and the detection limit of 0.35 fM (S/N = 3) under optimal experimental conditions. The method was successfully applied to the detection of chlorpyrifos in fruit and vegetable samples with satisfactory results.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Dingqiong Wei,Yao Ding,Zhaohui Li
To fabricate an efficient two-component Z-scheme system for visible light induced overall water splitting, CdS/WO 3 nanocomposites , with cubic CdS nanoparticles grown on the surface of hexagonal WO 3 nanorods , were prepared via a facile precipitation of Cd 2+ with S 2− in the presence of pre-obtained hexagonal WO 3 nanorods. MnO 2 and MoS 2 , the co-catalysts for O 2 and H 2 generation respectively, were selectively deposited on WO 3 and CdS in the CdS/WO 3 nanocomposites. The resultant MoS 2 –CdS/WO 3 –MnO 2 composites show photocatalytic activity for overall water splitting under visible light, with an optimized performance observed over 2.0%MoS 2 -0.2 CdS/WO 3 -1.0%MnO 2 . The visible light induced overall water splitting over MoS 2 –CdS/WO 3 –MnO 2 nanocomposites can be attributed to the presence of a Z-scheme charge transfer pathway in the CdS/WO 3 nanocomposites, ie, the transfer of the photo-generated electrons from the CB of WO 3 to the VB of CdS to recombine with the photo-generated holes through an efficient interface between cubic CdS and hexagonal WO 3 . The left photo-generated holes in VB of WO 3 and the photo-generated electrons in CB of CdS therefore can accomplish the water oxidation and water reduction simultaneously, with the assistance of the surface deposited cocatalysts (MnO 2 and MoS 2 ). This work demonstrated the great potential of fabricating the two-component direct Z-scheme photocatalytic systems for overall water splitting from two semiconductors with a staggered band structure .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Taiping Hu,Kai Dai,Jinfeng Zhang,Shifu Chen
Step-scheme (S-scheme) photocatalytic system has been considered as an effective method for solar energy conversion by utilizing broadband solar energy, realizing easy separation of photoexcited carriers and strong redox ability. Herein, the novel ternary Ni 2 P cocatalysted two-dimensional (2D)/2D SnNb 2 O 6 /CdS-diethylenetriamine (SNO/CdS-D) system was designed and fabricated. The S-scheme SNO/CdS-D heterostructure gives photocatalytic hydrogen production of 7808 μmol g −1 h −1 , which is about 130.13 and 2.35 times stronger than that of SNO and CdS-D. Further, noble-metal-free Ni 2 P cocatalyst is decorated into SNO/CdS-D heterostructure, the photocatalytic hydrogen evolution performance could be enhanced to 11,992 μmol g −1 h −1 . Additionally, XPS analysis and DFT calculation revealed the carriers moves from CdS-D to SNO and then to Ni 2 P in the Ni 2 P-SNO/CdS-D nanocomposite. This work will give a reliable and clear insight into the interface and surface design of the 2D catalysts and offer a broadband photocatalytic hydrogen evolution process without noble metal cocatalysts.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Jun-Tao Cao,Jing-Lu Lv,Yu-Xiang Dong,Xiao-Jing Liao,Shu-Wei Ren,Yan-Ming Liu
A general spatial-resolved photoelectrochemical (PEC) sensing platform for sensitive and high-throughput protein analysis was developed by integrating CdS@g-C 3 N 4 heterojunction modified rotatable electrodes array with signal antibodies labeled Cu 2 O (Cu 2 O-Ab 2 ) conjugates. The disk substrate containing eight spatial-resolved working electrodes array was fabricated using acid etching treatment method. After stepwise immobilizing CdS@g-C 3 N 4 , capture antibodies (Ab 1 ), varied concentrations of target protein (prostate-specific antigen) and Cu 2 O-Ab 2 conjugates on the corresponding sensing sites, the immunosensor array was prepared completely. Combining the high photoelectric conversion efficiency of the photoactive material with the effective signal probe, the immunosensor exhibits high sensitivity. The proposed spatial-resolved immunosensing platform shows a working range of 1.0 × 10 -11 – 5.0 × 10 -8 g mL −1 with a detection limit of 5.0 pg mL −1 . The method provides a universal paradigm for near-simultaneously detection of multi-batch samples with good specificity and high sensitivity.
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Hongjun Fang,Yusong Pan,Minyun Yin,Linfeng Xu,Yuan Zhu,Chengling Pan
Ternary Ti 3 C 2 –OH/ln 2 S 3 /CdS composites with an efficient visible-light-driven photocatalytic performance have been prepared via a facile hydrothermal synthesis method. The photo-degradation experiments verified that Ti 3 C 2 –OH/ln 2 S 3 /CdS composite with a large surface area of 68.2 m 2 /g exhibited an enhanced photocatalytic activity and adsorption capacity towards Rhodamine B under visible light irradiation , which was higher than that of the naked CdS and ln 2 S 3 , respectively. Furthermore, Ti 3 C 2 –OH/ln 2 S 3 /CdS composite showed robust degradation efficiency for mixture dyes of RhB and Methyl Orange (MO), and its catalytic ability was superior to that of ternary GO/ln 2 S 3 /CdS composite. The trapping experiments for active species revealed that hole (h + ) and • O 2 − species played a critical role in the removal of organic pollutants. In summary, the enhanced photocatalytic performance of Ti 3 C 2 –OH/ln 2 S 3 /CdS photocatalyst was derived from an excellent charge carrier separation and transfer of Ti 3 C 2 –OH MXene and the synergistic effect between CdS and ln 2 S 3 which resulting in strong visible light response.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Yingying Qin,Hong Li,Jian Lu,Fanying Meng,Changchang Ma,Yongsheng Yan,Minjia Meng
In the practical photocatalytic hydrogen evolution process, the light absorption, charge carrier separation and optimizing the activation ability of reactive molecules are the pivotal factors that restrict photocatalytic performance. Hence, we rationally engineer novel CdS/Ti 3+ /N-TiO 2 (TNTC) composite photocatalyst via integrating the evaporation induced self-assembly (EISA) and in-situ hydrothermal method. In the TNTC system, Ti 3+ /O V and doped N respectively locate at below the conduction band (CB) and above the valence band (VB) of TiO 2 to shorten the band gap from two inverse directions, thereby improving light utilization efficiency. The type II heterojunction TNTC with interfacial coupling effect can foster the spatial charge separation and the Ti 3+ can form hydrogenation layer to reduce the activation barrier of H 2 , which all can improve H 2 evolution capacity. Integrating with the above advantageous qualities, the 10%CdS/Ti 3+ /N-TiO 2 (TNTC10) has the best photocatalytic H 2 evolution activity (1118.5 μmol), which is about 15 and 40 times higher than that of CdS (71.6 μmol) and Ti 3+ /N-TiO 2 (TNT, 27.7 μmol), respectively. Furthermore, we also test the photocatalytic activity of 10%CdS/N-TiO 2 (NTC10) to facilitate comparison with TNTC10. Expectedly, the photocatalytic activity of TNTC10 is 6 times higher than that of NTC10 (178.3 μmol), uncovering that the Ti 3+ hydrogenated layer plays a pivotal role in boosting the efficiency of H 2 evolution. It is hoped that this work will provide a new cognitive perspective and understanding for building new-fashioned hydrogen evolution photocatalysts.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 7
·3408-3414
·
IF 10.733
Song Ma,Kai Chen,Yun-Hang Qiu,Li-Li Gong,Gui-Min Pan,Yong-Jie Lin,Zhong-Hua Hao,Li Zhou,Qu-Quan Wang
Substantial effort has been devoted to synthesizing plasmonic metal/semiconductor heteronanostructures with controlled morphology owing to their excellent performance ranging from photocatalysis to optical information processing. However, growing semiconductor heterojunctions with both counterparts in direct contact with the plasmonic metal nanostructures remains challenging. Herein, we report a three-step method to grow CdS–Cu2−xS lateral heteroshells on Au nanoparticles with all components directly connected with each other. Ag2S semi shells are initially grown on the Au nanoparticles as an interim layer, Cu2−xS semi shells are then grown on the uncovered surface of the Au nanoparticles, and CdS is generated by replacing Ag2S and the Au core complex with CdS–Cu2−xS lateral heteroshells Au/CdS–Cu2−xS is finally obtained. These complexes integrate the plasmon resonances of Au in the visible region and that of Cu2−xS in the near-infrared region, and therefore show improved photocatalytic activity and high photothermal efficiency. This study offers a synthetic approach to grow metal sulfides on Au nanostructures which have diverse applications in photocatalysis and photothermal therapy.
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BIOSENSORS & BIOELECTRONICS
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2019
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IF 9.518
Xue Zhang,Tao Yan,Tingting Wu,Yixuan Feng,Meng Sun,Liangguo Yan,Bin Du,Qin Wei
It is essential to develop a highly efficient detection platform for tetracycline (Tc). Herein, based on well-designed hierarchical MIL-68(In)-NH 2 /MWCNT/CdS composites as a highly efficient transducer, a label-free visible light driven photoelectrochemical (PEC) aptasensor was systematically fabricated. Characterization results indicate that the forming of MIL-68(In)-NH 2 /CdS heterojunction remarkable facilitated the transfer and inhibited the recombination of charge carriers. Moreover, the transfer properties of multiwalled carbon nanotubes (MWCNTs) further improved the photoelectric conversion efficiency by adjusting electron transport routes. The aptamer as a biorecognition unit was grafted on the modified electrode by chemical bonding effect, and Tc molecules could be captured through the specific interaction of aptamer and Tc in solution. The concentration of Tc was detected by observing the fluctuation of photocurrent signals. Under optimized conditions, the proposed aptasensor showed the broad linear range from 0.1 nmol L −1 to 1 μmol L −1 with a low detection limit (LOD) of 0.015 nmol L −1 . Furthermore, the high sensitivity, excellent reproducibility and favorable stability of the PEC sensing platform indicated the potential applications for antibiotic residues detecting in environmental media.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 17
·5649-5655
·
IF 4.052
Yilei Li,Tian Jin,Ge Ma,Yunchao Li,Louzhen Fan,Xiaohong Li
Here, hollow CdS nanoboxes (average size of 120 nm) with graded nanovoids (ranging from 2 nm to 13 nm) distributed in the walls (average thickness of 20 nm) are in situ synthesized through directly sulfurizing a Cd metal–organic framework (Cd-MOF-47) with thiourea. A specific surface area of 153 m2 g−1 is achieved. With as-prepared hollow CdS nanoboxes as photocatalysts for water splitting to H2 (visible light irradiation), H2 evolution rate is as high as 21 654 μmol g−1 h−1, which is nearly 79 times higher than that of bulk CdS. Such an excellent photocatalytic efficiency is ascribed to the large specific surface area for improving light absorbability and the porous nanostructure for efficiently utilizing excitation light due to the multiple scattering within the hollow framework. Moreover, a smaller band gap (2.30 eV) with a higher conduction band (−0.83 V) presents a strong reducibility, which is beneficial for reducing H2O to H2. A combination of fluorescence spectroscopy (PL), PL lifetimes and the photoelectrochemical technique shows that hollow CdS nanoboxes exhibit lower fluorescence intensity, longer electron lifetime and stronger photocurrent intensity than bulk CdS, implying an improved separation and transfer of photoinduced charge carriers. This work presents a novel methodology to prepare hollow nanostructures, exhibiting potential applications in the field of energy conversion.
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Nanomaterials
·
2019
·Vol. 9
·期 8
·1165
·
IF 4.034
Zhezhe Wang,Xuechun Xiao,Yue Yang,Tong Zou,Xinxin Xing,Rongjun Zhao,Zidong Wang,Yude Wang
A new high performance fluorescence assay for detection of Ag+based on CdS quantum dots (QDs) using L-Aspartic acid (L-Asp) as a stabilizer was proposed in this work. The CdS quantum dots conjugation with L-Aspartic acid (L-Asp@CdS QDs) were successfully synthesized via a simple hydrothermal process. The QDs have a fluorescence emission band maximum at 595 nm with a quantum yield of 11%. The obtained CdS QDs exhibit a particle size of 1.63 ± 0.28 nm and look like quantum dot flowers. Basically, the fluorescence intensity of L-Asp@CdS QDs can be enhanced only upon addition of Ag+and a redshift in the fluorescence spectrum was observed. Under optimum conditions, the fluorescence enhancement of L-Asp@CdS QDs appeared to exhibit a good linear relationship in between 100–7000 nM (R2= 0.9945) with the Ag+concentration, with a detection limit of 39 nM. The results indicated that the L-Asp@CdS QDs were well used in detection for Ag+as fluorescence probe in aqueous solution with high sensitivity and selectivity. Moreover, the sensing system has been applied in detection Ag+in real water samples. The recovery test results were 98.6%~113%, and relative standard deviation (n = 5) is less than 3.6%, which was satisfactory.Keywords:L-Aspartic acid;CdS quantum dots;fluorescence assay;Ag+detection;Fluorescence enhancement
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