JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Guoshuai Wang,Huiyun Wei,Yanhong Luo,Huijue Wu,Dongmei Li,Xinhua Zhong,Qingbo Meng
CdSe x Te 1−x alloyed colloidal quantum dots show great potential application on quantum dot-sensitized solar cells (QDSCs) due to its relatively wide light absorption range and high chemical stability. In this respect, a thin Mn modified CdSe layer is introduced into TiO 2 /CdSe x Te 1−x alloyed QDs surface via a simple chemical bath deposition method (CBD) in order to further improve the cell performance. The power conversion efficiency of CdSe x Te 1−x QDSCs has been improved to 8.14%. Detailed investigation on the influence of this modification toward the TiO 2 /CdSe x Te 1−x interface on the cell performance reveals that introduction of Mn into CdSe QDs is found to facilitate the Mn-doped CdSe deposition and improve the light absorption of the device. In the meantime, the existence of the (Mn-)CdSe layer can also work as a passivation layer to reduce charge recombination.
研究领域:
材料科学
·
能源研究
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2018
·
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.
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 11
·4125-4133
·
IF 8.262
Li Chen,Weilin Chen,Huaqiao Tan,Jiansheng Li,Xiaojing Sang,Enbo Wang
Quantum dot sensitized solar cells with high theoretical conversion efficiency, low production cost and a simple production process have received great attention in recent years. For CdSe-sensitized cells, the most significant defect of CdSe is that it has the weak absorption between 550 and 600 nm and no absorption after 650 nm, so it is crucial to find a wide spectrum photosensitizer to make up for the defect. Here, wide spectrum and pure inorganic Donor–Acceptor (D–A) Type Polyoxometalate (POM) K6H4[α-SiW9O37Co3(H2O)3]·17H2O (denoted as T) is firstly introduced into QDSCs as a collaborative cosensitizer with CdSe. The T has a visible characteristic peak centering between 550 and 600 nm, and also has stronger absorption after 650 nm, which could make up for the defect of CdSe to constitute a wide spectrum of absorption. The fluorescence spectrum, surface photovoltage spectrum, ultraviolet photoelectron spectroscopy spectrum and solid diffuse spectrum were used to explore the photosensitivity of T. In addition, the D–A type POM can act as a good intermediate for the injection of electrons and improve the visible photocurrent response; meanwhile, it can obviously reduce the dark current and increase the electron lifetime, which can solve the problem about the high recombination at the QD/TiO2/electrolyte interface. In general, the best photovoltaic performance of T and CdSe cosensitized solar cells is increased to 6.59% (Jsc = 18.37 mA cm−2, Voc = 0.57 V, FF = 0.63), which is improved by 32.33% compared to those of the pure CdSe-sensitized cells (Jsc = 16.20 mA cm−2, Voc = 0.50 V, FF = 0.61, η = 4.98%).
研究领域:
材料科学
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太阳能
·
光化学
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高影响因子
LUMINESCENCE
·
2019
·Vol. 34
·期 7
·680-688
·
IF 1.691
Yang Liu,Piaopiao Chen,Shan Zheng,Yichen Xing,Chaobiao Huang
In this study, a high fluorescence sensitivity and selectivity, molecularly imprinted nanofluorescent polymer sensor (MIP@SiO 2 @QDs) was prepared using a reverse microemulsion method. 2,4,6-Trichlorophenol (2,4,6-TCP) was detected using fluorescence quenching. Tetraethyl orthosilicate (TEOS), quantum dots (QDs) and 3-aminopropyltriethoxysilane (APTS) were used as cross-linker, signal sources and functional monomer respectively. The sensor (MIP@SiO 2 @QDs) and the non-imprinted polymer sensor (NIP@SiO 2 @QDs) were characterized using infra-red (IR) analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The selectivity of MIP@SiO 2 @QDs was examined by comparing 2,4,6-TCP with other similar functional substances including 2,4-dichlorophenol (2,4-DCP), 2,6-dichlorophenol (2,6-DCP) and 4-chlorophenol (4-CP). Results showed that MIP@SiO 2 @QDs had better selectivity for 2,4,6-TCP than the other compounds. Fluorescence quenching efficiency displayed a good linear response at the 2,4,6-TCP concentration range 5–1000 μmol/L. The limit of detection (LOD) was 0.9 μmol/L (3σ, n = 9). This method was equally applicable for testing actual samples with a recovery rate of 98.0–105.8%. The sensor had advantages of simple pretreatment, good sensitivity and selectivity, and wide linear range and could be applied for the rapid detection of 2,4,6-TCP in actual samples.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
TALANTA
·
2016
·
IF 4.035
Xiaolong Ma,Xin Zhang,Xinli Guo,Qi Kang,Dazhong Shen,Guizheng Zou
Sensitive and selective determining bio-related molecule and enzyme play an important role in designing novel procedure for biological sensing and clinical diagnosis. Herein, we found that dual-stabilizers-capped CdSe quantum dots (QDs) in composite film of multi-walled carbon nanotubes (CNTs) and Nafion, displaying eye-visible monochromatic electrochemiluminescence (ECL) with fwhm of 37 nm, which offers promising ECL signal for detecting ascorbic acid (AA) as well as the activity of alkaline phosphatase (ALP) in biological samples. It was also shown that the dual-stabilizers-capped CdSe QDs can preserve their highly passivated surface states with prolonged lifetime of excited states in Nafion mixtures, and facilitate electron-transfer ability of Nafion film along with CNTs . Compared with the QDs/GCE, the ECL intensity is enhanced 1.8 times and triggering potential shifted to lower energy by 0.12 V on the CdSe-CNTs-Nafion/GCE. The ECL quenching degree increases with increasing concentration of AA in the range of 0.01–30 nM with a limit of detection (LOD) of 5 pM. The activity of ALP was determined indirectly according to the concentration of AA, generated in the hydrolysis reaction of l -ascorbic acid 2-phosphate sesquimagnesium (AA-P) in the presence of ALP as a catalyst, with an LOD of 1 μU/L. The proposed strategy is favorable for developing simple ECL sensor or device with high sensitivity, spectral resolution and less electrochemical interference.
研究领域:
分析化学
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生物医学工程
·
临床诊断
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
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.
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PubMed
高影响因子
DYES AND PIGMENTS
·
2019
·
IF 4.018
Siyao Zhu,Feifei Zhao,Mingxiao Deng,Tianyi Zhang,Changli Lü
The nanostructured hybrid assembly has gained growing interest due to their unique electronic, optical and catalytic properties . Herein, a novel ratiometric fluorescent sensor was constructed by coupling blue-green emission carbon dots (CDs) to a block copolymer micelle-encapsulated red-emission CdSe/ZnS QDs through host-guest interaction. The carbon dots (CDs) were prepared by carbonization of β-cyclodextrin (β-CD) via a simple hydrothermal process. The amphiphilic diblock copolymer AZO-PNIPAM-b-P(St-co-MQ) containing azobenzene (AZO)-terminated hydrophilic poly( N -isopropylacrylamide) (PNIPAM) block and hydrophobic polystyrene (PS) block was synthesized by a typical RAFT polymerization . The 5-(2-methacryloylethyloxymethyl)-8- quinolinol (MQ) units were introduced into PS block, which could make CdSe/ZnS QDs to be embedded into the core of the block polymer micelles via coordination interaction in the self-assembling process. The as-fabricated β-cyclodextrin derived CDs-coupled block copolymer hybrid micelles loaded with CdSe/ZnS QDs as a fluorescence sensor exhibited dual emission peaks of CDs centered at 450 nm and CdSe/ZnS QDs at 620 nm with a large peak separation of 170 nm upon excitation at 360 nm. And the as-prepared hybrid micelles as a ratiometric fluorescence sensor can be applied to detect Hg 2+ and Cu 2+ with the detection limits down to 1.6 and 2.74 μM, respectively.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-10
·
IF 5.3
Shan Xiangyu,Lu Juan,Li Chao,Wu Qian,Li Huiling,Yang Shuning,Guo Yanjia,Song Yujia,Li Ruidan,Tian Li
An efficient and innovative electrochemiluminescence (ECL) sensor was developed for trace detection of cyfluthrin. The sensor utilized materials such as lotus root shaped carbon fiber (Co CNFs), cadmium selenide quantum dots (CdSe QDs), and Fe 3 O 4 to amplify Ru(bpy) 3 2+ signals. Co CNFs, with its large specific surface area and porosity, served the purpose of not only enhancing the stability of the sensor by fixing CdSe QDs and Ru(bpy) 3 2+ on the Co CNFs/GCE, but also facilitating electron transfer. CdSe QDs was involved in the luminescence reaction and collaborated with Ru(bpy) 3 2+ to enhance the sensor's sensitivity, while Fe 3 O 4 promoted electron transfer in the system due to its large surface area. The solid-state ECL sensor achieved satisfactory signal under the synergistic action of these components. The ECL signal of the sensor was quenched by cyfluthrin, and a favorable linear relationship was observed between the sensor and cyfluthrin in the concentration range 1 × 10 –12 to 1 × 10 –6 M. The detection limit of the sensor was 3.3 × 10 –13 M (S/N = 3). The utilization of lotus root shaped carbon fiber, CdSe QDs, and Fe 3 O 4 in the Ru(bpy) 3 2+ system demonstrated a synergistic effect for cyfluthrin detection, presenting a new approach for the rapid determination analysis of pesticide residues in foods. Graphical
研究领域:
分析化学
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环境监测
·
食品安全
·
纳米材料
·
电分析化学
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高影响因子
Advanced Science
·
2021
·Vol. 9
·期 2
·2102530
·
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.
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PubMed
高影响因子
Light-Science & Applications
·
2024
·Vol. 13
·期 1
·1-11
·
IF 20.6
Luo Chengzhao,Ding Yanhui,Ren Zhenwei,Wu Chenglong,Huo Yonghuan,Zhou Xin,Zheng Zhiyong,Wang Xinwen,Chen Yu
The high pixel resolution is emerging as one of the key parameters for the next-generation displays. Despite the development of various quantum dot (QD) patterning techniques, achieving ultrahigh-resolution (>10,000 pixels per inch (PPI)) and high-fidelity QD patterns is still a tough challenge that needs to be addressed urgently. Here, we propose a novel and effective approach of orthogonal electric field-induced template-assisted dielectric electrophoretic deposition to successfully achieve one of the highest pixel resolutions of 23090 (PPI) with a high fidelity of up to 99%. Meanwhile, the proposed strategy is compatible with the preparation of QD pixels based on perovskite CsPbBr 3 and conventional CdSe QDs, exhibiting a wide applicability for QD pixel fabrication. Notably, we further demonstrate the great value of our approach to achieve efficiently electroluminescent QD pixels with a peak external quantum efficiency of 16.5%. Consequently, this work provides a general approach for realizing ultrahigh-resolution and high-fidelity patterns based on various QDs and a novel method for fabricating QD-patterned devices with high performance.
研究领域:
材料科学
·
纳米技术
·
显示技术
·
电气工程
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hao Wang,Zixuan Yang,Yutong Gao,Ziyue Zheng,Jing Yang,Ting Wang,Dong Yang,Yajun Wang,Tongtao Li,Angang Dong
We present a coordination-inspired strategy for assembling binary nanocrystal superlattices (BNSLs) using CdSe nanotetrapods as symmetry-encoding building blocks. Exploiting their intrinsic tetrahedral geometry, which mimics the sp 3 hybridization of carbon atoms in a diamond lattice, we encode spatially defined binding sites that guide regioselective coassembly with spherical nanocrystals. By tuning the size ratio between components, we achieve both three-dimensional and two-dimensional BNSLs with long-range structural order. Notably, in NaCl-type BNSLs, the CdSe tetrapod sublattice defines a hypothetical porous network that is topologically analogous to a diamond lattice—an architecture difficult to realize using isotropic nanocrystals. The key advantage of this approach lies in its ability to translate molecular coordination principles into nanoscale assembly, thereby enabling access to architecturally complex and topologically rich lattices. A potential limitation, however, is the need for precise control over component size and shape to ensure high-quality ordering. By integrating molecular coordination concepts with nanocrystal assembly, this work establishes nanotetrapods as versatile symmetry-directing building blocks for the rational design of next-generation superlattices. This work establishes nanotetrapods as symmetry-directing building blocks for designing architecturally complex BNSLs, bridging molecular coordination chemistry with nanocrystal assembly.
研究领域:
材料科学
·
纳米技术
·
化学
·
凝聚态物理
·
自组装
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 8
·1633-1644
·
IF 5.066
Rui Zhang,Baochang Zhang,Yingbo Liu,Shuqing Sun
In this paper, we firstly report the preparation of 3D graphene networks (GNs) by sonication-free liquid-phase exfoliation (LPE) and C dot grafted graphene (CD–G) hybrids. The 3D GNs and CD–G hybrids were incorporated into TiO2 photoanodes for improving the photovoltaic performance of CdS/CdSe quantum dot sensitized solar cells (QDSSCs) due to their unique structures and excellent conductivities. When the amounts of incorporation are 1.6 wt% for GNs and 2.0 wt% for CD–G, η (photoelectric conversion efficiency) exhibited improvements from 4.04% to 4.37% and 4.69%, respectively. The remarkable improvements in η are predominantly ascribed to the fact that the electron transport from TiO2 to graphene decreased the probability of recombination of charge carriers and ultimately improved the photoelectric conversion efficiency. For CD–G/TiO2, the electron transport from C dots to graphene may strengthen the effect. This work demonstrates a possibility of fabricating superior photoanodes for enhancing the performances of QDSSCs by designing graphene nanoarchitectures with unique structures and morphologies as the dopants.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
光伏技术
·
半导体器件
·
界面工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）