SENSORS
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2017
·Vol. 17
·期 1
·80
·
IF 2.677
Changwu Lv,Zhenhong Jia,Jie Lv,Hongyan Zhang,Yanyu Li
N-type macroporous silicon microcavity structures were prepared using electrochemical etching in an HF solution in the absence of light and oxidants. The CdSe/ZnS water-soluble quantum dot-labeled DNA target molecules were detected by monitoring the microcavity reflectance spectrum, which was characterized by the reflectance spectrum defect state position shift resulting from changes to the structures’ refractive index. Quantum dots with a high refractive index and DNA coupling can improve the detection sensitivity by amplifying the optical response signals of the target DNA. The experimental results show that DNA combined with a quantum dot can improve the sensitivity of DNA detection by more than five times.Keywords:N-type porous silicon;quantum dot labeling;QD-DNA;reflectance spectrum
研究领域:
材料科学
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光学
·
生物传感
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纳米技术
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DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 13
·2288
·
IF 5.719
Chenyu Zhu,Qiao Wang,Guorong Sun,Suo Zhao,Yao Wang,Tonghui Li,Xianglong Hao,Mikhail Artemyev,Jianguo Tang
In this paper, hydrophobic luminescent CdSe quantum dots are successfully dispersed in a mixture of styrene and methyl methacrylate through the oleic to methacrylic acid ligand exchange. Further in situ solution polymerization of the quantum dots in a mixture of styrene and methyl methacrylate followed by electrospinning allowed us to prepare luminescence hybrid styrene-co-methyl methacrylate fibers embedded with quantum dots. CdSe@P(S+MMA) hybrid fibers with 27% quantum yield showed excellent moisture, heat and salt resistance with a photoluminescence output below 120 °C. When dry heated, the hybrid fibers of the fluorescence signals decreased with temperature to 79%, 40%, 28%, 20% and 13% at 120 °C, 140 °C, 160 °C, 180 °C and 200 °C, respectively, due the to the chemical degradation of CdSe QDs. Such hybrid fibers show the potential to manufacture wearable moisture- and heat-sensing protective clothing in a 120–200 °C range due to the thermal-induced quenching of quantum dot photoluminescence.Keywords:CdSe;polymer;hybrid fibers;photoluminescence thermal sensor
研究领域:
材料科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 3
·2065-2071
·
IF 3.84
Guifen Jie,Kai Chen,Xiaochun Wang,Zhengkun Lu
In this work, new dual-stabilizer-capped CdSe quantum dots (QDs) with unique electrochemiluminescence (ECL) were prepared, and used to design a promising “off–on” ECL biosensor for highly sensitive assay of thrombin by target-triggered multiple amplification for the first time. New poly(diallyldimethylammonium chloride) (PDDA)–graphene oxide (GO) nanocomposites with good electroconductibility and much surface area was used to assemble a large number of CdSe QDs on the electrode, showing excellent ECL and stability. The ECL of CdSe QDs was efficiently quenched by gold nanoparticles (off state), the presence of target thrombin resulted in the generation of numerous DNA sequences (t1) by using multiple DNA cycle amplification techniques. Subsequently, the specific hybridization of abundant t1 to the quencher probe caused significantly amplified ECL enhancement (on state), which was used for highly sensitive detection of thrombin. More importantly, the biosensor with the dual-stabilizer capped CdSe QDs demonstrated highly intense ECL emission, and the DNA devices by the cleavage reaction were cycled for multiple rounds, which greatly amplified the ECL signal and much improved the detection sensitivity. The developed assay protocol also shows high selectivity for the target and can be performed in homogeneous solutions. These distinct advantages make it a potential platform for detecting various types of biomolecules. This flexible biosensing system exhibits excellent performance in real human serum assay, which has wider potential applications than other ECL reagent-based system.
研究领域:
生物传感器技术
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分子诊断学
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纳米生物学
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产品关联
DOI
高影响因子
Nanoscale Research Letters
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2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Chen Zeng,Wei Chaochao,Li Shengjun,Diao Chunli,Li Wei,Kong Wenping,Zhang Zhenlong,Zhang Weifeng
SnO 2 nanosheet-structured films were prepared on a fluorine-doped tin oxide (FTO) substrate using ZnO nanosheet as template. The as-prepared SnO 2 nanosheets contained plenty of nano-voids and were generally vertical to the substrate. TiO 2 nanoparticles were homogeneously deposited into the intervals between the SnO 2 nanosheets to prepare a hierarchically structured SnO 2 /TiO 2 hybrid film. The hybrid films were co-sensitized with CdS and CdSe quantum dots. The sensitized solar cells assembled with the SnO 2 /TiO 2 hybrid film showed much higher photoelectricity conversion efficiency than the cells assembled with pure TiO 2 films. The lifetime of photoinduced electron was also investigated through electrochemical impedance spectroscopy, which showed that the SnO 2 /TiO 2 hybrid film electrode is as long as the TiO 2 film electrode.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2021
·
IF 10.041
Xiao Chen,Xiaoyong Ding,Yilin Liu,Jing Li,Wenjuan Liu,Xiaolong Lu,Zhongwei Gu
Micro/nanomotors have attracted extensive attentions in aquatic environmental remediation, but the random motion and uncontrollability restricts the precise location and timely adjustment in micro-environmental remediation, such as in microchannels and microwells. Herein, we demonstrated visible-light-driven cadmium sulfide quantum dots doped cuprous oxide (Cu 2 [email protected] ) micromotors adsorbent with excellent removability to cationic dye, in along with effective motion regulation. The Cu 2 [email protected] micromotors adsorbent with type II heterostructure was fabricated by simple in-situ deposition and exhibited outstanding motion controllability and instant response under visible light illumination. The existence of a staggered gap between Cu 2 O and CdSe formed a heterojunction, effectively inhibiting recombination of photogenerated electron-hole pairs and improving photocatalytic activity of Cu 2 [email protected] micromotors. Negative phototactic self-propulsion with maximum speed to ∼42.3 μm/s was achieved in biological environments because of the formation of the asymmetric chemical concentration gradient around the motors. Additionally, by modulating the direction and on/off state of asymmetric light field, it is capable of steering motor moving with multiple controllable modes, such as horizontal, vertical, stop/go and patterned propulsion, which will facilitate the on-demand orientation once in the complex microchannel. Furthermore, the capability of Cu 2 [email protected] micromotors adsorbent is confirmed with a rapid adsorption rate of 96% on methyl blue after 10 min. Additionally, the stability of micromotors is evaluated. Although with inevitable oxidation or photocorrosion for all Cu 2 O micromotor, the strong adsorption ability is promised with 5 times recycling in low concentration of dye solution. Such attractive micromachines with boosted motility and lower production cost hold a considerable promise for a complex environmental remediation.
研究领域:
环境科学
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纳米技术
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材料科学
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化学工程
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产品关联
DOI
高影响因子
LUMINESCENCE
·
2022
·Vol. 37
·期 7
·1109-1119
·
IF 2.613
Yongjuan Meng,Jinling Pu,Jiamei Gan,Jianping Li
A composite of the metal–organic framework compound ZIF-8 doped with CdSe quantum dots (QDs) with sensitive and stable luminescence was synthesized, and a molecularly imprinted electrochemiluminescence (ECL) sensor was constructed based on this composite. The ZIF-8@CdSe molecularly imprinted ECL sensor combines the high sensitivity of ECL and the high selectivity of molecular imprinting to realize the sensitive and specific detection of estriol. CdSe QDs and gold nanoparticles were encapsulated within ZIF-8 to obtain the ZIF-8@CdSe QDs/GNP (ZIF@CdSe/GNP) composite. Subsequently, the GNPs were further loaded on the surface of this composite to obtain the GNP/ZIF@CdSe/GNP composite. l -Cysteine was used to immobilize the GNP/ZIF@CdSe/GNP composite on the surface of a gold electrode to obtain the GNP/ZIF@CdSe/GNP-modified gold electrode. A molecularly imprinted polymer (MIP) film was prepared on the surface of the modified electrode by electropolymerization with o -phenylenediamine as the functional monomer and estriol as the template molecule. After elution, estriol could be specifically recognized by the cavities. The readsorption of estriol by the MIP can prevent the coreactant from reaching the electrode surface through the cavities, thereby weakening ECL. A good linear relationship existed between the ∆ECL and lg C of estriol concentrations of 1 × 10 −14 to 1 × 10 −9 mol·L −1 . The detection limit was as low as 8.9 × 10 −16 mol·L −1 . The sensor was applied in the determination of estriol in serum samples with a recovery of 97.0–102%.
研究领域:
分析化学
·
生物医学工程
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 17
·期 11
·2909-2915
·
IF 2.279
Zhang Jing Bo,Zhao Fei Yan,Tang Guang Shi,Lin Yuan
PbS electrode with high catalytic activity to S n
2− reduction certificated by the measurements of electrochemical impedance spectroscopy and cyclic voltammetry was prepared by a simple method. The high catalytic activity makes it be a low-cost alternative counter electrode to platinum (Pt) to be used in quantum dots-sensitized solar cells (QDSSCs) based on polysulfide electrolyte. The photovoltaic performance enhancement of the quantum dots (QDs)-sensitized semiconductor thin films due to the PbS counter electrode was evaluated by fabricating QDSSCs based on CdSe QDs-sensitized ZnO (SnO 2 ) thin film. CdSe QDs-sensitized ZnO thin film has the lower internal total series resistance and electron transmission time, the higher electron lifetime and electron collection efficiency than the CdSe QDs-sensitized SnO 2 thin film. Replacing the Pt counter electrode with the PbS counter electrode leads to more improvement on the short circuit photocurrent density for QDSSC based on the ZnO thin film than the SnO 2 thin film. Therefore, the process to limit the photovoltaic performance of CdSe QDs-sensitized solar cell and the possible way to improve the photovoltaic performance were analyzed.
研究领域:
材料科学
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能源技术
·
光电化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Qian Wu,Li Tian,Xiangyu Shan,Huiling Li,Shuning Yang,Chao Li,Juan Lu
In this work, a novel electrochemiluminescence (ECL) sensor based on the CdSe@ZnSe and CNTs was constructed for the detection of melamine. CdSe@ZnSe acted as the co-reaction promoter for the enhancement of Ru(bpy) 3 2+ /tri- n -propylamine (TPrA) system and CNTs acted as carriers to immobilize more CdSe@ZnSe. The initial ECL signal significantly amplified due to the synergistic effect of CNTs and CdSe@ZnSe. The ECL signal decreased with the addition of melamine, and the change value of ECL intensity (ΔI) was linearly related to the logarithm of melamine concentration. The constructed ECL sensor was able to detect melamine in the range of 1.0 × 10 −11 − 1.0 × 10 −7 M, and the detection limit was 3.3 × 10 −12 M (S/N = 3). It can be used to detect melamine in milk samples.
研究领域:
分析化学
·
食品安全检测
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产品关联
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2018
·
IF 0
Xiaohong He,Xue Shen,Dongming Li,Yiyao Liu,Kun Jia,Xiaobo Liu
Nanoparticles exhibiting good biocompatibility and multifunctional optical, magnetic, and reactive properties are essential materials for the construction of next generation theranostics platforms. The core–shell structured CdSe@CdS is one of few semiconductor quantum dots (QD) that shows ideal photoluminescence for biological application including unity quantum yields, identical photoluminescence for ensembles and single dot, nonblinking, and antibleaching. However, overcoming toxicity concerns from Cd2+ is still a great challenge for promoting the practical medical application of the CdSe@CdS QD. Besides, the high quality luminescent and superparamagnetic nanoparticles at present are basically hydrophobic, which implies that the phase transfer of these functional nanoparticles into aqueous phase is the primary step to enable their biomedical application. Herein, we have developed a facile protocol to fabricate highly biocompatible nanoparticles showing both modulated luminescent and magnetic properties via a one-step self-assembling of amphiphilic block copolyarylene ether nitriles (amPEN), oleic acid stabilized CdSe@CdS QD, and Fe3O4 superparamagnetic nanoparticles (SP) in microemulsion system. Benefiting from the aromatic backbone structure of amPEN and its strong hydrophobic interaction with surface capping agent of QD/SP, the fabricated hybrid nanoprobe exhibits quite competitive colloids stability as well as fluorescent/magnetic properties, which ensures its application for in vitro fluorescence and magnetic resonance (MR) imaging of cancer cells.
研究领域:
生物医学工程
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材料科学
·
纳米医学
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产品关联
DOI
PubMed
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 6
·6338-6343
·
IF 1.338
Du Yingying,Yang Ping,Liu Yunshi,Zhao Jie,He Haiyan,Miao Yanping
TiO2 films consisted of small nanoparticles were fabricated via a spinning coating method on fluorine doped in tin oxide (FTO) slide glass. After calcination, the films were subsequently sensitized by CdSe quantum dots (QDs) using mercaptopropionic acid (MPA) as a bifunctional
surface modifier. Upon UV light irradiation, CdSe QDs inject electrons into TiO2 nanoparticles, thus resulting in the generation of photocurrent in QD-sensitized solar cell. The results indicate that TiO2 films sensitized by CdSe QDs have achieved 1.5-fold enhancement
in photocurrent compared with pure TiO2 films, indicating that CdSe QDs can improve the photocurrent by promoting the separation of photoinduced charge carriers. In addition, the photocurrent enhances as the thickness of TiO2 films increased. Such improved photoelectrochemical
performance is ascribed to the basis of improved interfacial charge transport of the TiO2-CdSe composite films. Combining QDs on TiO2 thin films is a promising and effective way to enhance the photoelectrochemical performance, which is important in QD-sensitized solar
cell application.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光化学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2015
·Vol. 31
·期 7
·669-675
·
IF 1.394
Yan Kai,Zhu Yuhan,Cheng Ling,Zhang Jingdong
A novel photoelectrochemical strategy for the sensitive determination of p-nitrophenol (PNP) was developed using a glassy carbon electrode (GCE) modified with CdSe quantum dots (QDs) and DNA composite film (CdSe-DNA/GCE). Various surface analytical techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), were employed to characterize the synthesized CdSe QDs and CdSe-DNA modified electrode. The interfacial behaviors of the modified electrodes were analyzed by electrochemical impedance spectroscopy (EIS), and the interaction between PNP and DNA was studied by UV-visible spectrometry. Due to the PNP-DNA interaction, CdSe-DNA/GCE exhibited a sensitive photocurrent response toward PNP under visible-light irradiation. The influencing factors, such as the concentration of DNA used for fabricating CdSe-DNA/GCE and the bias potential applied in the photoelectrochemical measurement, were investigated. Under the optimized conditions, the photocurrent on CdSe- DNA/GCE was linearly increased with the PNP concentration from 0.7 to 50 μmol L −1 , with a detection limit (3 S/N ) of 0.27 μmol L −1 . The proposed photoelectrochemical strategy was successfully applied to monitoring the degradation of PNP.
研究领域:
分析化学
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环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
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
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DOI
高影响因子
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