CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 6
·1032-1038
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IF 1.063
Zhu Yuxin,Jiang Xing,Lin Lin,Wang Shuhua,Chen Chao
A new ZnS/CdS heterojunction is constructed through the direct sulfurization of a metal ions exchanged Zn/Cd-MOF precursor(MOF=metal-organic framework material). The composition, structure, morphology, photoabsorption and photoelectric performance of the ZnS/CdS are characterized by powder X-ray diffraction(PXRD), scanning electron microscope(SEM), transmission electron microscope(TEM), diffuse reflection spectrum(DRS), photoelectric current(PEC), electrochemical impedance spectroscopy(EIS) and photoluminescence(PL) technologies. Since the metal ions are highly orderly separated by the organic ligands and the inherent porosity of the Zn/Cd-MOF, the as-synthesized ZnS/CdS possesses a large surface area and intimate contact at the heterogeneous interface with uniform ZnS/CdS nanoparticles. The photocatalytic hydrogen evolution activity of the ZnS/CdS is investigated under visible light irradiation(λ⩾420 nm). It exhibits enhanced photocatalytic performance that the optimal ZnS/CdS achieves a maximum average hydrogen production rate of 2348 µmol·h −1 ·g −1 . A possible electron transfer mechanism is therefore proposed by the analyses of the Mott-Schottky plots.
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RSC Advances
·
2020
·Vol. 10
·期 28
·16776-16782
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IF 3.119
Guo-Min Liu,Wen-Yuan Jia,Qiu-Shi Jiang,Zhi-Qiang Cheng
Exploiting photocatalysts with characteristics of low cost, high reactivity and good recyclability is a great significance for environmental remediation and energy conversion. Herein, hollow TiO2 nanotubes were fabricated by a novel and efficient method via electrospinning and an impregnation calcination method. With the hydrothermal method, the CdS nanoparticles were modified on the surface and in walls of the TiO2 nanotubes. By changing the reaction conditions, the morphology of CdS nanoparticles presents a controllable three-dimensional (3D) structure. The morphology of the samples was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structure and components of samples were characterized by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). The light absorption efficiency was detected using UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL). The photocatalytic properties were evaluated by degradation of methyl orange (MO) and photocatalytic hydrogen evolution under visible light irradiation. From the results, the TiO2/CdS nanotubes exhibit better photocatalytic activity than the pure TiO2. The synthetic mechanism of TiO2/CdS heterostructures and a possible photocatalytic mechanism based on the experimental results were proposed.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Zhi-Qiang Zhou,Yuan-Ping Liao,Jing Yang,Shan Huang,Qi Xiao,Li-Yun Yang,Yi Liu
Developing simple and sensitive non-aggregation strategy for detecting Cd 2+ is necessary for improving the selectivity and sensitivity of probe. Here, we establish a simple, rapid and ratiometric strategy for the recognition of Cd 2+ based on the formation of core-shell ZnSe/CdS structure using ZnSe quantum dots (QDs). The transformation from binary ZnSe QDs to core-shell ZnSe/CdS QDs both change the elemental composition and structure of ZnSe QDs, leading to the changes in band gap of ZnSe QDs, which could be observed in the UV–vis spectra. In the detection process, ZnSe QDs only possess absorption peak at 343 nm, the formation of ZnSe/CdS after the addition of Cd 2+ leads to the appearance of the new peak at 397 nm, while other heavy metal ions could not cause the appearance of new absorption peak. Therefore, this strategy shows good selectivity for Cd 2+ detection. Based on this strategy, the limit of detection (LOD) for Cd 2+ is 11 nM by UV–vis spectroscopy with a desirable relation of linearity (R 2 = 0.999) between A 397 /A 343 and Cd 2+ contents, which is superior to the LOD of most reported nanomaterials . The response time for Cd 2+ detection is as short as 60 s, which is suitable for rapid detection. This ratiometric probe has also been applied to the detection of Cd 2+ in tap water samples, the recovery of Cd 2+ was between 94.9% and 105.6% for tap water samples, indicating the high accuracy of our ratiometric assay. Our strategy not only provided a new method for detecting Cd 2+ , but also put forward an implication that the band energy changes of QDs caused by heavy metal ions can be applied in the selective and sensitive detection of heavy metal ions.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2023
·
IF 2.7
Jiapeng Zhang,Hui Zhang,Qinghua Du,Xinjian Xie,Yi Fang,Chengchun Tang,Guifeng Chen
Quantum dots (QDs) of I-III-VI 2 ternary compounds, such as CuInSe 2 (CISe) and CuInS 2 (CIS), have broad application prospects as light-absorbing layers in solar cells due to their excellent photoelectric properties. Nevertheless, the presence of large numbers of surface defects in quantum dots will affect their performance. In this study, inverted type-I CdS/CISe core-shell QDs are successfully synthesized through thermal injection method in triethylene glycol, which is green and safe. By changing the molar ratios of CdS and CISe QDs, the components and optical properties of core-shell QDs are intensively studied by using different characterization methods (XRD, TEM, EDS, UV–vis, Raman, and fluorescence spectrum). The solar cells with the structure of FTO/TiO 2 /CdS/CdS/CISe/Mo are assembled, where the CdS/CISe core-shell QDs are used as absorption layers. The prepared devices exhibit an efficiency of 1.01% under an AM 1.5 G spectrum with a light intensity of 100 mW cm −2 .
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DYES AND PIGMENTS
·
2026
·
IF 3.9
Ke Cheng,Tianyi Ma,Luoyilan Zhang,Hao Xue,Yin Yuan,Hong Zheng,Bin Liu
Coreopsis S/P-CDs from a CL sensor. • CL sensor detects Sudan III with 1.0 μM LOD. • Recoveries of 97.4% to 105.0% in real samples. A novel chemiluminescence sensor for Sudan III detection was developed using sulfur/phosphorus-doped carbon dots (S/P-CDs) synthesized from Coreopsis. Combined TEM, XPS, and FTIR analyses verified that the S/P-CDs exhibit uniform spherical morphology with well-resolved lattice fringes, successful S and P doping at atomic percentages of 3.6% and 1.7%, respectively, and abundant surface functionalities (including PO 4 3− and C O groups) that confer excellent water dispersibility and chemical reactivity. The S/P-CDs significantly enhanced the CL intensity of the acidic KMnO 4 -HCHO system. Under optimal conditions, the CL intensity was linearly correlated with the Sudan III concentration over the range of 5-100 μM, achieving a detection limit of 1.0 μM. The method was successfully applied to real samples, with recoveries of 97.4% to 105.0%, enabling rapid, convenient detection in food. Download: Download high-res image (366KB) Download: Download full-size image
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Wanqing Yu,Fangjing Mo,Jiang Guo,Yuqin Yang,Yushuang Jin,Yingzi Fu
Seeking and constructing superior photoactive materials have the potential to improve the performance of photoelectrochemical (PEC) biosensors. In this work, we proposed a novel mimosa-like ternary inorganic composite with a significantly enhanced light-harvesting ability and photogenerated carrier separation rate. This ternary photoactive material was obtained via electrodeposition of gold nanoparticles (Au) on the surface of transition metal sulfide composite of CdS and NiS (CdS-NiS/Au). The experimental results showed that the high initial photocurrent was acquired on CdS-NiS/Au (68-fold higher than that of individual CdS) with the synergistic effect of p-n heterojunction, Schottky junction, and the eminent optical properties of gold nanoparticles. Meanwhile, using silver nanoclusters prepared by link DNA protection as an effective quencher, integrating the duplex-specific nuclease-assisted rolling circle amplification strategy, a “Signal ON” PEC biosensor was fabricated for the detection of microRNA 21 (miRNA 21). With the release of the quencher, the recovered photocurrent is able to achieve determination of miRNA 21 within the range from 10 aM to 1 pM with a detection limit down to 4.6 aM (3σ). Importantly, this work not only provides a superb idea for designing ternary inorganic heteromaterials with exceptional photoactive ability but also allows the detection of other biomarkers by selecting appropriate recognition units.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yiting Liao,Lanzhen Peng,Xiaosong Zhou,Jin Luo,Limei Xu,Xiaomei Ning,Xiaoqin Zhou,Xunfu Zhou,Yueping Fang
Two major challenges in photocatalysis are the separation and utilization of photogenerated charge carriers that have limited their wider applications. To address these issues, significant studies have been devoted to the surface modification of photocatalysts. Herein, CdS nanorods were surface-modified by an ion-conducting LiTi 2 (PO 4 ) 3 (LTP) shell. This modification could accelerate the rapid separation and efficient utilization of photoinduced charge carriers. Therefore, CdS@LTP composite photocatalyst displayed a photocatalytic H 2 evolution rate of 26.01 mmol g −1 h −1 without any addition of cocatalysts in a Na 2 S/Na 2 SO 3 solution, which was over 6-fold compared to CdS, and showed improved stability. Furthermore, this shell can prevent the reverse reactions between H 2 and O 2 during photocatalytic water splitting. With the photo-deposition of Pt cocatalysts, CdS@LTP-Pt can achieve efficient overall water splitting with the highest H 2 generation rate (351 μmol g −1 h −1 ), which is 3.25 times higher than that of CdS-Pt. This study broadens the application of ionic conductor materials and provides a new way for the design of advanced photocatalysts for solar energy conversion.
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SOLID STATE SCIENCES
·
2023
·
IF 3.5
Meng-Yuan Zhu,Ya-Ru Li,Feng-Jun Zhang,Ying-Rui Wang
In order to enhance the interfacial coupling of heterojunctions , Cu 2 MoS 4 /CdS heterojunction was constructed by solvothermal method and sulfurizing CdIF and the crystal structure, microstructure and photoelectric properties of the material were characterized. The results showed that CdS was homogeneously loaded on the surface of Cu 2 MoS 4 , the absorption of the composite material in the visible light region was significantly enhanced, and the recombination rate of photogenerated carriers was obviously reduced. The research showed the best photocatalytic hydrogen evolution performance When the addition amount of Cu 2 MoS 4 is 0.10 mmol, the best photocatalytic hydrogen evolution performance is 10.03 mmol/h/g, which was 21.45 times higher than that of pure CdS. The improved performance is mainly due to the highly dispersed loading of CdS on the surface of Cu 2 MoS 4 , which organically combines to build a heterogeneous interface with close contact, enhancing the separation efficiency of photogenerated holes and carriers, while suppressing the photocorrosion of Cu 2 MoS 4 and maintaining the long-term stability of hydrogen evolution performance to achieve high-efficiency hydrogen evolution.
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Science China-Chemistry
·
2023
·Vol. 66
·期 6
·1722-1730
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IF 9.6
Xiao Ruixue,Zhang Jie,Jiang Tingting,Zhou Yefan,Wang Yun,Xu Wenjia,Feng Yuhua
Precise structural control had attracted tremendous interest in nanosynthesis due to its great importance in tailoring the physical properties of nanomaterials. Here we report the synthesis of highly ordered CdS-Au-TiO 2 ternary Janus structure via template-protected sequential growth and conversion method. Arising from the integration of the rectification effect of Au-CdS and Au-TiO 2 Schottky barriers, the Janus configuration of the CdS-TiO 2 domains, the plasmonic effect of Au nanosphere, and the Z -scheme charge transportation, the CdS-Au-TiO 2 Janus structure showed high efficiency in the model photocatalytic degradation of methyl orange (MO) dye. Importantly, the well-defined structural order allowed the identification of the correlation between the structure and the catalytic performance. We believe that the synthetic control and the mechanism insights would help the design and synthesis of sophisticated nanostructures, and would eventually promote their applications in photocatalysis fields.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 28
·15499-15508
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IF 11.9
Junqing Chang,Chaohao Hu,Zanhong Deng,Meng Li,Chengyin Shen,Shimao Wang,Longqing Mi,Ruofan Zhang,Qingli Zhang,Gang Meng
Methyl mercaptan (MM) is one kind of volatile sulfur compound (VSC) with odor and properties (inflammable, highly toxic, and corrosive) similar to H2S; therefore, the highly sensitive and selective monitoring of ambient MM by chemiresistors is strongly essential, but it remains a challenge owing to its relatively weak reducibility/response in comparison with H2S. In this study, a novel chemiresistor composed of hexahedral particles SBO-loaded CdS nanoparticles has been prepared via a facile chemical precipitation method for the super-sensitive and highly-selective recognition of MM. The heterostructural CdS/SBO (0.05%) chemiresistor exhibited an extremely high response (114.7) to 100 ppm MM at a relatively low operating temperature (100 °C) and was about 36- and 9-fold higher than pure SBO and CdS chemiresistor, respectively. Various characterizations suggested that the sulfurization–desulfurization reaction, the abundant oxygen vacancies, and the generation of n–n heterojunctions at the interface promote the redox reaction of surface-active substances, thereby, boosting the outstanding MM response characteristics. In addition, the heterostructural chemiresistor possesses good selectivity, weak humidity interference, a lower limit of detection (LoD) of 82 ppb, and long-term stability (∼6% decline of response after 120 days), which promises practical applications in air quality (odor) monitoring.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Guoyan Zhao,Sujuan Li
In this work, visible light driven photoelectrochemical glucose sensor was developed by electrochemically deposited CuO nanoparticles (CuO NPs) on graphene (GP)-CdS nanocomposites modified electrode to achieve both the electrocatalytic and photoelectrocatalytic oxidation of glucose. Scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used to characterize the morphology and electrochemical properties of the resultant CuO NPs/GP-CdS nanocomposites. The CV results demonstrated that modification of CuO NPs largely enhanced the photoelectrocatalytic activity of GP-CdS composites toward glucose oxidation in alkaline solution. The glucose detection sensitivity under visible light irradiation is dramatically improved compared to dark condition. Good performance was obtained for the CuO NPs/GP-CdS nanocomposites based glucose sensor. The feasibility of the present method was confirmed by good recovery results for glucose detection in human serum samples.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 4
·1128-1139
·
IF 5
Peijing Guo,Shaoyu Yuan,Bingrong Guo,Siwei Li,Yongjun Gao
A CoO–CdS heterostructured photocatalyst CC-2-300 loaded with carbon derived from the biomass material chitosan was synthesized. Under visible-light irradiation, the photocatalytic hydrogen evolution rate can reach up to 10.60 mmol gcat−1 h−1, which is 7.21 times higher than that of pure CdS under the same conditions, with good cycle stability and high apparent quantum efficiency. The control experiments and characterization results prove that the chitosan-derived carbon supported CoO nanorods and CdS nanoparticles are cross-distributed to form a direct Z-scheme heterojunction, which improves the migration efficiency of photogenerated carriers and effectively slows down the recombination rate of photogenerated charges and holes on CdS that is susceptible to photocorrosion, thus improving the efficiency of photocatalytic hydrogen evolution.
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