Advanced Science
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2021
·Vol. 9
·期 2
·2102530
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IF 16.806
Fazal Raziq,Amil Aligayev,Huahai Shen,Sharafat Ali,Rahim Shah,Sajjad Ali,Syedul H. Bakhtiar,Asad Ali,Naghat Zarshad,Amir Zada,Xiang Xia,Xiaotao Zu,Muslim Khan,Xiaoqiang Wu,Qingquan Kong,Chunming Liu,Liang Qiao
Artificial Z-scheme, a tandem structure with two-step excitation process, has gained significant attention in energy production and environmental remediation. By effectively connecting and matching the band-gaps of two different photosystems, it is significant to utilize more photons for excellent photoactivity. Herein, a novel one-photon (same energy-two-photon) Z-scheme system is constructed between rGO modified boron-nitrogen co-doped-WO 3 , and coupled CdSe quantum dots-(QDs). The coctalyst-0.5%Rh x Cr 2 O 3 (0.5RCr) modified amount-optimized sample 6%CdSe/1%rGO3%BN-WO 3 revealed an unprecedented visible-light driven overall-water-splitting to produce ≈51 µmol h −1 g −1 H 2 and 25.5 µmol h −1 g −1 O 2 , and it remained unchanged for 5 runs in 30 h. This superior performance is ascribed to the one-photon Z-scheme, which simultaneously stimulates a two photocatalysts system, and enhanced charge separation as revealed by various spectroscopy techniques. The density-functional theory is further utilized to understand the origin of this performance enhancement. This work provides a feasible strategy for constructing an efficient one-photon Z-scheme for practical applications.
研究领域:
材料科学
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环境科学
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理论化学
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DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
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2021
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IF 10.618
Xiaolin Zhong,Min Zhang,Lu'an Guo,Yongze Xie,Renfeng Luo,Wenxue Chen,Faliang Cheng,Lishi Wang
Designing a photoelectrochemical (PEC) immunosensor that can produce dual photocurrent signals which can refer to each other is a great importance but a big challenge. In this manuscript, a novel dual photocurrent signals immunosensor was constructed for the detection of α-fetoprotein (AFP). Unlike the usual method of using two composite materials to provide cathode and anode photocurrent respectively, this work applies only one compound of MIL-101 (Cr) and CdSe quantum dots (QDs). Thereinto, we found that the photocurrent polarity of MIL-101(Cr) would switch by adjusting applied voltage . And then CdSe QDs was introduced by simple ultrasound mixing to boost the dual photocurrent signals. Furthermore, in the composite of M&C, the electron transfer path between MIL-101(Cr) and CdSe QDs may switch between “Z-type” and “Ⅱ-type” by adjusting voltage. Benefiting by the dual signals, the proposed sensor can not only perform sensitively quantitative detection of α-fetoprotein (AFP), but also can intuitively estimate the accuracy and reliability of the test result by determining whether the corresponding relationship of “cathode photocurrent-analyte concentration-anode photocurrent” is established. The linear ranges of the sensing electrodes as cathode and anode are the same, both from 0.1 to 300 ng mL −1 . The limit of detection (LOD) is 0.082 ng mL −1 (S/N = 3) when it used as an anode, and the LOD is 0.054 ng mL −1 (S/N = 3) when it served as cathode. Furthermore, this sensor showed acceptable stability, reproducibility, specificity, and feasibility of detecting AFP in human serum, which has broad development prospects in the early clinical diagnosis.
研究领域:
生物医学工程
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分析化学
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DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2023
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IF 5.7
Meng Chen,Huawei Fang,Chao Wang,Jixiang Xu,Lei Wang
Background Solar-driven water splitting is regarded as one promising green way to produce H 2 . Photo-reduction of hexavalent chromium (Cr(Ⅵ)) to hypotoxic Cr(III) can control the Cr(VI)-induced pollution. A key in these processes is to develop a photocatalyst with high specific surface area, good light absorption and efficient charge carrier separation. Methods A Co-encapsulated N-doped carbon (Co@NC) was prepared by pyrolysis ZIF-8@ZIF-67 precursor to modify CdSe quantum dots (QDs). The obtained catalyst was used to reduce Cr(Ⅵ) and split water under visible light irradiation. Significant findings Modification CdSe with Co@NC made obtained Co@NC/CdSe possessing enhanced visible-light absorption and photoexcited charge separation. The optimal 2%Co@NC/CdSe exhibited the excellent Cr(Ⅵ) reduction performance with a rate constant of 0.28 min –1 in the absence of sacrificial agent, as well as high H 2 evolution rate of 6.48 mmol g –1 h –1 in 10% lactic acid solution. The H 2 O 2 and electrons were the active species to reduce Cr(VI). This work gives a beneficial insight for improving the photocatalytic activity of QDs.
研究领域:
环境科学
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材料科学
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化学
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DOI
高影响因子
OPTICAL MATERIALS
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2017
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IF 2.238
Jidong Wang,Xiaoyu Wang,Hengshan Tang,Zehua Gao,Shengquan He,Dandan Ke,Yue Zheng,Shumin Han
High-quantity CdSe QDs were synthesized in a novel two-phase liquid/liquid system. This system, ODE/water was stable and as-used solvents were almost nontoxic. The methodology leading to the successful synthesis of CdSe QDs was a typical, one-pot approach and the obtained CdSe QDs with zinc-blende phase structure exhibited excellent optical properties , narrow size distribution, higher particle uniformity and crystallinity . The mechanism of nucleation and growth of CdSe QDs were discussed by the possible thermodynamic equilibrium existing in ODE/water interface. This two-phase liquid/liquid system would broaden the synthesis of other semiconductor QDs.
研究领域:
材料科学
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纳米技术
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化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Li Luo,Zhen Fan,Zhaobin Zhang,Danyang Liu,Guofa Li,Lishuang Wang,Bingsuo Zou
SnO2 nanoparticles (NPs) have been used as an electron transport layer (ETL) in quantum dot light-emitting diodes (QLEDs) to achieve stable and high-performance devices. However, SnO2 NPs with high electron mobility cause the problem of imbalanced charge injection and transport in QLEDs. Meanwhile, the SnO2 NPs synthesized at low temperature have hydroxyl (−OH) groups, which could damage the performance of QLEDs. Here, Zn doping was applied to modulate the properties of SnO2 NPs and achieve better carrier balance in green CdSe/ZnS QLED. The maximum current efficiency (CE) of QLED with 5 wt % Zn-doped SnO2 NPs is 2.3-fold higher than that of SnO2-based QLED. In addition, a small-molecule 4,4′-bis(carbazole-9-yl)-1,1′-biphenyl (CBP)-mixed poly(9-vinylcarbazole) (PVK) layer was used as a hole transport layer to facilitate the hole injection and charge balance. As a result, a maximum external quantum efficiency (EQE) of 5.03% is obtained for the best performance device. The T50 lifetime at a luminance of 100 cd/m2, for a device based on 5 wt % Zn-doped SnO2 ETL, is 9141 h, which is 2.29-fold longer than the reference one. This work provides a new strategy to obtain high-performance and stable display arrays.
研究领域:
材料科学
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光电子学
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纳米技术
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DOI
高影响因子
CHEMOSPHERE
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2014
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IF 3.499
Jie Mei,Li-Yun Yang,Lu Lai,Zi-Qiang Xu,Can Wang,Jie Zhao,Jian-Cheng Jin,Feng-Lei Jiang,Yi Liu
The interactions between quantum dots (QDs) and biological systems have attracted increasing attention due to concerns on possible toxicity of the nanoscale materials. The biological effects of CdSe QDs and CdSe/ZnS QDs with nearly identical hydrodynamic size on Saccharomyces cerevisiae were investigated via microcalorimetric, spectroscopic and microscopic methods, demonstrating a toxic order CdSe > CdSe/ZnS QDs. CdSe QDs damaged yeast cell wall and reduced the mitochondrial membrane potential. Noteworthy, adhesion of QDs to the yeast cell surface renders this work a good example of interaction site at cell surface, and the epitaxial coating of ZnS could greatly reduce the toxicity of Cd-containing QDs. These results will contribute to the safety evaluation of quantum dots, and provide valuable information for design of nanomaterials.
研究领域:
纳米技术
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生物科学
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毒理学
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DOI
PubMed
高影响因子
Materials Chemistry Frontiers
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2023
·Vol. 7
·期 8
·1624-1632
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IF 7
Kangkang Wang,Zhexue Chen,Yueqi Li,Yong Zhang
Semiconductor quantum dots (QDs) are of great interest for a wide range of applications. Herein, we report the top-down production of CdSe QDs with a super small size (about 3 nm) and high yield (14%). The as-produced QDs exhibit different optical properties from those of colloidal QDs. This is probably due to the generation of numerous bare edges during the process of silica-assisted ball-milling. The CdSe QD-based substrate could serve as a surface-enhanced Raman scattering (SERS) substrate for the ultrasensitive recognition of probe molecules at trace levels, which are mainly attributed to the special edge–edge interactions and charge transfer (CT) enhancement mechanism. The substrate exhibits good reproducibility, uniformity, and high enhancement factor (5.05 × 106) with an expansion of the ultra-low limit of detection (LOD) to 10−10 M. It has also been successfully used in the reliable, quantitative, and label-free detection of uric acid (UA) at a low concentration (1 μM), which facilitates the early prevention of gout disease. This QD-based platform not only confirms the feasibility of SERS analysis but also provides ideas for the early detection of residues.
研究领域:
纳米技术
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分析化学
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材料科学
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生物医学工程
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DOI
高影响因子
MICROCHIMICA ACTA
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2016
·Vol. 184
·期 1
·73-80
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IF 4.831
Shi Jian-Jun,Meng Lei-Xia,Yang Ping
The authors describe an electrochemiluminescence (ECL) assay for the determination of 2,4,6-trinitrotoluene (TNT) in soil. It is based on the finding that graphene quantum dots (GQDs) strongly enhance the ECL of CdSe quantum dots (CdSe QDs), and ECL is strongly quenched by TNT. In order to assemble the GQDs and CdSe QDs, the latter were functionalized with carboxy groups and then coupled to amino-functionalized GQDs (afGQDs). The resulting CdSe-GQDs conjugation was placed as a thin film on a glassy carbon electrode (GCE). The modified electrode displays an about 8-fold enhanced ECL intensity compared to an GCE with CdSe QDs only, and the onset potential of the ECL reaction is positively shifted by 140 mV. In the presence of TNT, the ECL is quenched due to the formation of the TNT-amine complex. The decrease in ECL intensity is related to the logarithm of the TNT concentration in the range from 0.01 to 100 ppb, with a detection limit as low as 3 ppt. The results of TNT assays in (spiked) soil samples showed recoveries between 99.2 and 105.0 % and relative standard deviations between 3.0 and 8.2 %. This strategy offers a new perspective for developing ECL assays based on the use of semiconductor nanoparticles and graphene-based nanomaterials.
A electrochemiluminescence (ECL) assay was developed for the detection of 2,4,6-trinitrotoluene (TNT). The method utilizes a combination of CdSe and graphene quantum dots (GQDs), and a glassy carbon electrode modified with poly(diallyldimethylammonium chloride)-protected graphene. The assay is simple and displays acceptable reproducibility.
研究领域:
分析化学
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环境科学
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高影响因子
JOURNAL OF CHEMICAL PHYSICS
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2024
·Vol. 160
·期 23
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IF 3.1
Zhu Hongmei,Wang Qingqian,Chen Wei,Sun Kun,Zhong Huaying,Ye Taikang,Wang Zhaojin,Zhang Wenda,Müller-Buschbaum Peter,Sun Xiao Wei,Wu Dan,Wang Kai
Chiral perovskite materials are being extensively studied as one of the most promising candidates for circularly polarized luminescence (CPL)-related applications. Balancing chirality and photoluminescence (PL) properties is of great importance for enhancing the value of the dissymmetry factor ( g lum ), and a higher g lum value indicates better CPL. Chiral perovskite/quantum dot (QD) composites emerge as an effective strategy for overcoming the dilemma that achieving strong chirality and PL in chiral perovskite while at the same time achieving high g lum in this composite is very crucial. Here, we choose diphenyl sulfoxide (DPSO) as an additive in the precursor solution of chiral perovskite to regulate the lattice distortion. How structural variation affects the chiral optoelectronic properties of the chiral perovskite has been further investigated. We find that chiral perovskite/CdSe–ZnS QD composites with strong CPL have been achieved, and the calculated maximum | g lum | of the composites increased over one order of magnitude after solvent-additive modulation (1.55 × 10 −3 for R-DMF/QDs, 1.58 × 10 −2 for R-NMP-DPSO/QDs, −2.63 × 10 −3 for S-DMF/QDs, and −2.65 × 10 −2 for S-NMP-DPSO/QDs), even at room temperature. Our findings suggest that solvent-additive modulation can effectively regulate the lattice distortion of chiral perovskite, enhancing the value of g lum for chiral perovskite/CdSe–ZnS QD composites.
研究领域:
材料科学
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光电
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纳米技术
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化学
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DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
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IF 4.841
Siyi Li,Meng Zhang,Xue Ma,Jing Qiao,Hongbo Zhang,Jun Wang,Youtao Song
In this work, an ortho-symmetric double (OSD) Z-scheme SnO 2 \CdSe/Bi 2 O 3 sonocatalyst is skillfully designed and synthesized via ultrasonic-assisted isoelectric point method and then the sonocatalytic activity is studied under ultrasonic irradiation in the degradation of organic contaminants. The effects of ultrasonic irradiation time, sonocatalyst dosage, initial Rhodamine B concentration, organic dye kind and used times are investigated systemically. The formation of OH and h + are confirmed by using t-BuOH and oxalate, respectively. The Rhodamine B can completely be degraded under given experimental conditions such as 10 mg/L Rhodamine B solution, 1.00 g/L OSD Z-scheme SnO 2 \CdSe/Bi 2 O 3 dosage and 150 min ultrasonic process. The formation of mainly intermediate products is studied by Liquid Chromatography–Mass Spectrometry. Moreover, the sonocatalytic reaction mechanism caused by OSD Z-scheme SnO 2 \CdSe/Bi 2 O 3 is presented.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of the American Chemical Society
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2016
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IF 13.038
Chaodan Pu,Xiaogang Peng
Electronic traps at the inorganic–organic interface of colloidal quantum dots (QDs) are detrimental to their luminescent properties. Several types of interface traps were identified for single-crystalline CdSe/CdS core/shell QDs, which were all found to be extrinsic to either the core/shell structure or their optical performance. The electron traps—presumably excess or unpassivated Cd surface sites—are shallow ones and could be readily isolated from the electron wave function of the excitons with more than ∼2 monolayers of CdS shell. There were two identifiable deep hole traps within the bandgap of the QDs, i.e., the surface adsorbed H2S and unpassivated surface S sites. The surface adsorbed H2S could be removed by either degassing processes or photochemical decomposition of H2S without damaging the QDs. The unpassivated surface S sites could be removed by surface treatment with cadmium carboxylates. Understanding of the surface traps enabled establishment of new phosphine-free synthetic schemes for either single-precursor or successive-ion-layer-adsorption-and-reaction approach, which yielded CdSe/CdS core/shell QDs with near-unity photoluminescence quantum yield and monoexponential photoluminescence decay dynamics with 2–10 monolayers of CdS shell.
研究领域:
材料科学
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纳米技术
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光电技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Jun-Tao Cao,Xiao-Jing Liao,Yu-Ling Wang,Yan-Ming Liu
A novel photoelectrochemical (PEC) aptasensor for lead ion (Pb 2+ ) detection was proposed on the basis of the CdSe quantum dots (QDs) co-sensitized ZnO-CdS nanostructure and the specificity of aptamer. The CdSe QDs-capped cDNA, as a signal enhancement element, could hybridize with the aptamer on the sensing platform to generate a CdSe/CdS/ZnO dual co-sensitized structure, realizing a great enhancement in photocurrent response. In the presence of Pb 2+ , the aptamer on the sensing interface specifically bound with the Pb 2+ to form G-quadruplex structures, which greatly inhibit the hybridization between aptamer and CdSe QDs-cDNA, leading to a decrement of the photocurrent signal. As the concentration of Pb 2+ increased, the photocurrent response showed a diminishing tendency. Under the optimized conditions, the fabricated PEC aptasensor exhibited a linear response between photocurrent variation and the logarithm of Pb 2+ concentration in the scope of 1.0 × 10 −9 M to 1.0 × 10 −5 M with a detection limit of 3.4 × 10 −10 M. Moreover, the aptasensor has been applied in the determination of Pb 2+ in environmental water samples with the good selectivity .
研究领域:
分析化学
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环境科学
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纳米技术
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生物传感器
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DOI
高影响因子
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