International Journal of Electrochemical Science
·
2023
·
IF 1.5
Liying Wei,Xiaokun Li,Suxiang Feng
In this paper, a CdSe quantum dots (QDs) sensitized TiO 2 photoanode was synthesized by molten-salt-assisted self-assembly (MASA) on a fluorine-doped tin oxide (FTO)-coated glass (CdSe QDs-TiO 2 /FTO), and an efficient photoelectrochemical (PEC) sensor was constructed for the sensitive detection of rutin. CdSe can transfer photo-excited electrons to the conduction band of TiO 2 , thus enhancing the photoelectric activity of TiO 2 . The experimental results show that the PEC sensor has excellent selectivity, good stability, and a wide linear response range for rutin of 0.025–50.0 μM with a low detection limit of 0.007 μΜ. Moreover, the PEC sensor was successfully applied to the detection of rutin content in serum sample.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Yu-ping Wei,Xing-Pei Liu,Chang-jie Mao,He-Lin Niu,Ji-Ming Song,Bao-Kang Jin
An electrochemical biosensor was developed based on a steric hindrance hybridization assay to allow the highly sensitive detection of streptavidin . In the steric hindrance hybridization assay, the signaling strand DNA (sig-DNA) was labeled at the 3′ end with CdSe quantum dots (QDs) and at the 5′ end with biotin , and capturing strand DNA (the complementary strand of sig-DNA) was labeled at the 5′ end with thiol. The steric hindrance effect generated by streptavidin which was bound with the signaling DNA strand. The streptavidin limited the ability of the sig-DNA to hybridize with the cap-DNA, which were linked on the surface of a gold electrode. Therefore, the concentration of streptavidin was detected indirectly based on the concentration of CdSe QDs on the electrode surface . The concentration of CdSe QDs on the electrode surface was detected by differential pulse anodic stripping voltammetry . Under optimal conditions, the streptavidin detection range using the as-prepared biosensor was 1.96 pg/mL to 1.96 µg/mL and the detection limit was 0.65 pg/mL. The experimental results showed that the electrochemical biosensor could detect streptavidin rapidly and accurately.
研究领域:
分析化学
·
生物传感器
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yuan-Yuan Tang,Jing-Shuai Chen,Xing-Pei Liu,Chang-Jie Mao,Bao-Kang Jin
As an important heptapeptide toxin, microcystine-LR (MC-LR) has attracted extensive attention because of its great harm to animals, plants and plankton in water. Therefore, an ultrasensitive photoelectrochemical aptasensor based on ZnIn 2 S 4 /CdSe heterojunction was disigned to monitor MC-LR. In this strategy, the ZnIn 2 S 4 /CdSe heterojunction with matching energy levels was used as the substrate of the aptasensor. By reason of the effective separation of electrons and holes, the heterojunction exhibited wide light absorption region and increased light utilization rate, resulting in a higher electrical signal. The specific recognition of MC-LR depend on the precise binding with aptamer, which modified on the electrode through base complementary pairing. In the presence of MC-LR, MC-LR was specific recognized by MC-LR aptamer, the photocurrent signal amplifier Bi 2 S 3 was released from the aptasensor electrode, leading to a decreased photocurrent. The designed photoelectrochemical aptasensor showed an ultrasensitive detection for MC-LR with a wide response range from 10 -1 to 10 -8 µM, and lower detection limit of 0.55 × 10 -8 µM (3σ/S).
研究领域:
环境科学
·
分析化学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 24
·15724-15733
·
IF 4.123
Qingqing Qiu,Ping Wang,Lingling Xu,Dejun Wang,Yanhong Lin,Tengfeng Xie
Anatase TiO2 nanowire (NW) films modified with inverted type-I CdS/CdSe core/shell structure QDs have been successfully prepared by the post synthesis ligand-assisted technique. Surface photovoltage (SPV), transient photovoltage (TPV) and transient photocurrent (TPC) measurements demonstrate that CdS/CdSe core/shell structure QD-sensitized TiO2 NWs electrodes favor photoexicited electron injection and charge transfer due to the special photo-electronic features of CdS/CdSe core/shell structure QDs. With a polysulfide electrolyte, the maximum conversion efficiency was 2.18% for CdS/CdSe QDs with the CdSe shell being 4.4 nanometers thick; a PCE of 0.07% for CdS QDs and a PCE of 0.63% for CdSe QDs were obtained under illumination at 100 mW cm−2. The results reveal that the CdS/CdSe core/shell structure QDs sensitized TiO2 NW electrodes have promising applications in solar cells.
研究领域:
材料科学
·
光伏技术
·
纳米科技
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Shuning Liu,Chenchen Liu,Xinying Luan,Rui Yao,Yakai Feng
The far-red/near infrared photoluminescence of zinc phthalocyanines would be strongly quenched once they are aggregated, which will obviously hinder their wide applications in environmental, energy related and biomedical fields. Herein, the ultra-small sized semiconductor quantum dots with core-shell structures (CdSe@CdS) have been firstly synthesized and then assembled with a dendritic zinc phthalocyanine (ZnPc) in the H 2 O/DMF mixed solvent to obtain monodispersed nanospheres. Finally, it was found that the resultant ethanolic colloids can be employed as a sensitive and specific fluorescent nanoprobe for silver ions discrimination with a limit of detection (LOD) approaching to 10 − 8 mol/L.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2023
·Vol. 14
·期 5
·902
·
IF 3.4
Yong Xie,Chao Bian,Mingjie Han,Ri Wang,Yang Li,Yuhao Xu,Shanhong Xia
A highly sensitive and accurate dual-signal strategy is developed for trace Cu2+detection based on the inner filter effect (IFE) between Tween 20-gold nanoparticles (AuNPs) and CdSe/ZnS quantum dots (QDs). Tween 20-AuNPs are utilized as colorimetric probes and excellent fluorescent absorbers. The fluorescence of CdSe/ZnS QDs can be quenched efficiently by Tween 20-AuNPs via IFE. In the presence of D-penicillamine, D-penicillamine induces the aggregation of Tween 20-AuNPs and the fluorescent recovery of CdSe/ZnS QDs at high ionic strength. Upon addition of Cu2+, D-penicillamine tends to selectively chelate with Cu2+and then forms the mixed-valence complexes, which consequently inhibits the aggregation of Tween 20-AuNPs and the fluorescent recovery. The dual-signal method is used to quantitatively detect trace Cu2+, with low detection limits of 0.57 μg/L and 0.36 μg/L for colorimetry and fluorescence, respectively. In addition, the proposed method using a portable spectrometer is applied to the detection of Cu2+in water. This sensitive, accurate and miniature sensing system has potential in environmental evaluations.Keywords:fluorescence;colorimetry;copper;CdSe/ZnS quantum dots;gold nanoparticles;inner filter effect
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TECHNOLOGY AND HEALTH CARE
·
2019
·
IF 0.787
Liu Quan,Zheng Chao,Zhao Hui,Wang Kan,Tao Wei
The incidence of cancers has increased year by year and the early diagnosis for cancer is important to prevent cancers. Due to abnormal metabolism of tumor cells, the acidification of extracellular environment is an important feature for cancer cells. To achieve efficient and accurate pH measurement, this paper proposes a new detection method based on the fluorescence characteristics of CdSe quantum dots detection, which uses CdSe QDs with unique optical properties as sensitive substances for pH detection. PBS buffer (0.2 mol/L) with different pH has been used to simulate cell metabolites at different pH values and use 365 nm laser source to excite mixture liquid. The emitted light was detected by a fluorescence detection device. A mathematical model between fluorescence intensity and pH was finally obtained. The experimental results show the method show better effectiveness than other pH detection methods and has a high resolution of 0.037 within a pH range of 6.1–7.8 and a measurement resolution of 0.037 pH units. This method has high temperature stability and short testing time, which shows high potential for pH detection. This method has its superiority in all the testing methods. It exhibits a new way of generalizing to pH detection.
研究领域:
生物化学
·
生物医学工程
·
癌症研究
·
光学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Yunxia Hu,Chaomin Chen,Yuan Liu,Sui Wang,Zhiyong Guo,Yufang Hu
In the present work, a dual signals electrochemiluminescence (ECL) ratiometric strategy was designed based on the synergic effect of the catalysis effect and ECL resonance energy transfer . It was found that CdSe quantum dots (CdSe QDs) can catalyze the oxidation of luminol to promote the signal intensity of luminol at 0.45 V. At the same time, a stronger cathodic ECL peak at −0.75 V from CdSe QDs was observed, which could be attributed to the resonance energy transfer between luminol as a donor and CdSe QDs as an acceptor. Moreover both signals from two different potentials increased with the increase hydrogen peroxide concentration. On the basis of the above results, an enzyme-free ECL sensor was fabricated by immobilization of coating CdSe QDs on Au-graphite oxide (GO-Au) composites modified glassy carbon electrode (GCE), and luminol solution as probe solution, which was used to detect rapidly and sensitively hydrogen peroxide in the range of 0.5–500 μM with a detection limit of 0.5 μM based on the ration of two signals. The sensor exhibited good reproducibility and sensitivity, suggesting that the simple method will be promising in the detection of active oxygen in environmental samples.
研究领域:
分析化学
·
生物传感
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Li Wen,Yifan Xie,Peng Yang,Hongli Zhang,Jiahe Li,Zeyu Feng,Gang Zou
Chiroptical materials with strong and switchable circularly polarized luminescence (CPL) properties have gained considerable interest due to their feasible applications in optoelectronic devices, sensing, and information encryption. However, in most cases, their luminescence dissymmetry factor (g lum ) and figure of merit (FOM) values remain very low. Herein, a novel heterogeneous twisted-stacking structure is proposed, which endows with strong CPL amplification (a maximum of ≈15-fold enhancement) over traditional homogeneous structures and a high FOM value up to 0.11. Interestingly, their CPL performance (including the sign, magnitude, and spectral position) and the FOM values can be precisely manipulated or even inversed by simply uniaxial stretching, since the phase retardation of the anisotropic poly (vinyl alcohol) layer can be controlled. Moreover, by combining with the viologen gel electrochromic system, the in situ voltage-driven switching and patterning of the CPL signal can be successfully achieved, with low operation voltage and good cycling stability. This study provides a creative strategy for fabricating strong and electrical switchable CPL-active materials, which promise new opportunities in miniaturized smart electrochiroptical devices for future information technology.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 7
·957
·
IF 4.034
Pengchao Li,Baohua Zhu,Peng Li,Zhihao Zhang,Luyao Li,Yuzong Gu
CdSe-reduced graphene oxide (CdSe/RGO) composites were synthesized by a hydrothermal method. CdSe/RGO composites with different mass ratios were prepared. The structure and morphology of CdSe/RGO composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The synthesis of CdSe/RGO complexes was successfully demonstrated by Fourier infrared (FT-IR) and Raman spectra. CdSe nanoparticles in the CdSe/RGO composite were uniformly dispersed on the graphene surface. The study found that oxygen-containing functional groups such as hydroxyl (-OH) and carboxyl (-COOH) groups in graphene played a decisive role in the dispersion of CdSe. The third-order nonlinear optical properties of CdSe/RGO composites were measured by a single beam Z-scan technique. The experimental results showed that composites exhibited two-photon absorption and self-focusing nonlinear refraction properties. Additionally, the third-order nonlinear susceptibility of the composite material was obviously enhanced, which was mainly due to the good dispersion of CdSe nanoparticles on graphene.Keywords:CdSe/RGO nanocomposites;carboxyl groups;third-order nonlinear optical property;Z-scan technique;good dispersion
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jianguang Jia,Chunmei Liu,Yuan Lin,Xiaowen Zhou
Charge recombination is an important factor that limits the cell efficiency of quantum dot sensitized solar cells (QDSSCs). Herein, we report a facile way to improve the cell performance of CdSe sensitized ZnO QDSSC by overcoating a thin layer of ZnSe on CdSe/ZnO film through a successive ionic layer adsorption and reaction (SILAR) procedure. Photovoltaic investigations indicate that ZnSe overcoating can increase photocurrent and photovoltage of the cell, resulting in significant enhancement of the cell efficiency, which is much better than the widely used traditional ZnS material. The superior role of ZnSe overcoating is ascribed to its large inhibition of charge recombination loss owing to its suitable band structure, efficient passivation of ZnO and CdSe QDs as well as its small lattice mismatch with CdSe that leads to the large decrease of surface/interface defects in CdSe/ZnO photoanode . This finding provides an alternative efficient way to enhance the cell performance of ZnO based QDSSC by suppressing the charge recombination.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
半导体物理
·
光伏技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Liang Li,Shao-zhong Hu,Ting Huang,Nan Zhang,Yong Wang
Constructing heterogeneous catalyst with different bandgaps is a prospect way to realize efficient charge transfer of catalytic redox reaction. Semiconductor-based catalyst as a prospective material can effectively solve sewage issues under light irradiation, but the efficiency is greatly influenced by the recombination rate of photoelectrons and holes. In this work, cerium dioxide (CeO 2 ) nanoparticles (NPs) were grown in-situ on carbon nanotubes (CNTs), which can maintain the pollutant removal efficiency of pure CeO 2 NPs and enhance the adsorption intensity under visible light for CeO 2 @CNTs composite. Furthermore, the introduction of cadmium selenide (CdSe) was conducive to establish built-in electronic field in the ternary CeO 2 @CNTs/CdSe catalyst, which effectively enhanced the catalytic activity of CeO 2 @CNTs/CdSe. In comparison to CNTs, CdSe, CeO 2 and CeO 2 @CNTs composite, the ternary CeO 2 @CNTs/CdSe catalyst exhibited higher photocurrent intensity, lower recombination of photoelectrons and holes (e - /h + ) pairs, indicating much better photocatalytic activity. CeO 2 @CNTs/CdSe as photocatalyst displayed excellent adsorption ability for Congo red (CR), which contributed to increase the transparency of reaction solution and improve the utilization rate to light, the evaluated degradation efficiency of CR achieved 83.58 % and the reduction ratio of Cr(VI) was nearly 100 %. This work confirms that CeO 2 @CNTs/CdSe composite with excellent adsorption and photocatalytic ability is a promising photocatalyst material in wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）