INORGANICA CHIMICA ACTA
·
2024
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IF 2.7
Gang Liu,Sheng Xu,Wenting Li,Zhenghao Li,Lingli Liu,Shangxi Zhang,Bing Hui
In order to enhance the visible light catalytic activity of TiO 2 by broadening its photoresponse range, the TiO 2 / N -GQDs (TGs) composite catalysts with a three-dimensional hollow urchin-like structure were prepared by one-step hydrothermal method. The microstructure and photoelectric properties of the synthesized TGs composites were analyzed through a series of characterizations, and the performance in degrading organic dyes under visible light was investigated. The results demonstrated that the prepared composites effectively enhanced the visible light absorption spectrum of TiO 2 by forming heterojunction. The degradation efficiency of organic dyes could reach 95.71% under visible light irradiation for 1 h, which further increased to 99.39% after 2 h. Additionally, the photocatalytic degradation process could be effectively accelerated under acid conditions. After 5 cycles of testing, the degradation efficiency of TGs composites on organic dyes was hardly reduced, indicating that they had great visible light catalytic activity and significant reusability.
研究领域:
材料科学
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环境科学
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光催化技术
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产品关联
DOI
高影响因子
PLoS One
·
2019
·Vol. 14
·期 7
·e0220005
·
IF 2.776
Shuyao Zhang,Zheling Zhang,Xiaoling Zhang,Jian Zhang
In present work, a highly sensitive biosensor with high selectivity for glucose monitoring is developed based on novel nano-composites of nitrogen doped graphene quantum dots (N-GQDs) and a novel bimetallic Cu/Ni core-shell nanoparticles (CSNPs) (Cu@Ni CSNPs/N-GQDs NCs). With the tuned electronic properties, N-GQDs helped bimetallic core-shell structure nanomaterials from aggregation, and separate the charges generated at the interface. This novel nano-composites also have the good electrical conductivity of N-GQDs, catalyst property of Cu/Ni bimetallic nano composite, Cu@Ni core-shell structure and the synergistic effect of the interaction between bimetallic nano composite and N-GQDs. While modified the electrode with this novel nano-composites, the sensor’ linear range is 0.09 ~ 1 mM, and the limit of detection (LOD) is 1.5 μM (S/N = 3) with a high sensitivity of 660 μA mM -1 cm -2 , and rapid response time (3 s). Its’ LOD is more than 74 times lower than the traditional Cu@Ni CSNPs modified working electrode. It also has higher sensitivity and wider linear range. This indicates the great potential of applying this kind of nano composites in electrode modification.
研究领域:
生物传感
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材料科学
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分析化学
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DOI
PubMed
高影响因子
Advanced Energy Materials
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2026
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IF 25.5
Wendong Zhu,Qiuxiang Wang,Haoming Xing,Jing Zhang,Yuanyuan Wang,Yuhong Xu,Jiaxing Xiong,Rong Xuan,Wenwu Xu,Da Chen,Xiaohui Liu,Like Huang,Yuejin Zhu,Changlei Wang
Solution-processed SnO 2 nanoparticles are promising nonfullerene electron transport materials, yet their performance in low-bandgap (LBG) tin-lead perovskite solar cells (Sn-Pb PSCs) is hindered by inadequate charge transport and interface energy misalignment. To address these issues, we developed a SnO 2 -graphene quantum dot (GQD) electron transport layer (ETL) by functionalizing solution-processed SnO 2 with GQDs. Both theory calculations and experiments indicate the electron-bridging role of GQDs in perovskite/GQD-SnO 2 heterojunction, greatly facilitating directional charge transfer. Moreover, GQDs play a dual role by passivating defects on both SnO 2 and perovskite surfaces, while optimizing the energy level alignment at this critical interface. Consequently, the optimized LBG Sn-Pb PSCs exhibit significantly enhanced voltage and fill factor, achieving a champion efficiency of 23.38% with robust stability under ISOS-L-1 and ISOS-D-2 protocols. When integrated into all-perovskite tandem solar cells, the optimized device delivers a promising efficiency of 29.40%. This work enables the first viable inorganic ETL for realizing high-performance Sn-Pb PSC and its tandem applications.
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Lihua Zhang,Lihua He,Qi Wang,Qianlin Tang,Fei Liu
A new molecularly imprinted polymer (MIP) electrochemical sensor was prepared applying one-step electro-copolymerization of 3, 4-ethylenedioxythiophene (EDOT) and methacrylic acid (MAA) in the presence of sulfadimidine as a template molecule on a glassy carbon electrode (GCE) which modified with graphene quantum dots (GQDs)-Pt nanoparticles (PtNPs). A computational approach was employed to screen the suitable functional monomer, and the simulation data suggested that EDOT and MAA as bifunctional monomers exhibited a preferable capability to recognize the target molecule compared to other monomers. The MIP material was characterized with scanning electron microscope (SEM), transmission electron microscope (TEM) and electrochemical impedance spectroscopy (EIS). The performance of MIP sensor was evaluated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results indicated that the electro-copolymerization of EDOT and MAA provides large amounts of functional groups for the binding of the template molecules, which significantly enhances the sensitivity of the MIP sensor. The calibration curve demonstrated linearity over a concentration range of 0.1 nM-0.1 mM with a detection limit of 0.023 nM. This study provides complete and valuable information on the rational design, preparation, and application of sulfadimidine molecularly imprinted polymers using advanced materials and new bi-functional monomers.
研究领域:
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Jinling Li,Tao Shao,Bowen Meng,Shijie He,Qiankun Zhang,Dongxia Zhang,Xibin Zhou
At present, Pt-based catalysts with controllable compositions , architectures, and crystal facets are still the most prevalent materials for the electro-oxidation of methanol (MOR), which is a compelling reaction in proton exchange membrane fuel cells. Herein, based on graphene quantum dots (GQDs), we report a facial and environment-friendly approach to prepare the Au@GQDs@Pt x Pb core-shell nano-pompons for the MOR in alkaline solutions. It was noticed that among all the as-synthesized samples, Au@GQDs@Pt 3.5 Pb displays an admirable activity, which is as high as 15.14 A mg −1 Pt and almost 38-fold higher than that of commercial Pt/C catalyst. And its resistance to poisoning species and long-term stability are also greatly improved. The improved performance for MOR might be attributed to the channel-rich structure of catalysts with the aid of GQDs, Au, and the electronic effect between Pt and Pb. The results indicate that the reasonable composition and structure of Au@GQDs@Pt x Pb exhibits efficient MOR, it could be a promising candidate for direct methanol fuel cells.
研究领域:
材料科学
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电化学
·
催化反应
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产品关联
DOI
高影响因子
TALANTA
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2022
·
IF 6.556
Mingxing Liu,Rongrong Jiang,Meie Zheng,Mengjiao Li,Qingjie Yu,Hongda Zhu,Huiling Guo,Hongmei Sun
A sensitive unlabeled ratiometric biosensor was developed to the detection of cardiac troponin I (cTnI). This biosensor was established by using the glassy carbon electrode coated with graphene oxide to form a platform bonded with N, Zn co-doped graphene quantum dots (N, Zn-GQDs). The N, Zn-GQDs was successfully prepared as the raw materials of graphite powder and characterized. Antibodies of cTnI were bonded to the surface of N, Zn-GQDs as the nanoprobe by amide bonds. The signals of electrochemiluminescence (ECL) and differential pulse voltammetry (DPV) were exposed to decrease in the presence of cTnI, which caused the signal substance to move farther away from the electrode. It was found that the immune complex layer attenuated the intensity of ECL and DPV which could be used as the good overall signal for determining concentration of cTnI. The ratiometric biosensor had a good response to cTnI with the detection limit is 4.59 pg L −1 in the concentration range of 10–10 6 pg L −1 . The developed method was evaluated for the detection of cTnI in human serum, and the obtained results were consistent compared to the reference values obtained by hospital standard enzyme linked immunoassay (ELISA) with 9.09%–11.1% of RSD. Our findings suggested that this ratiometric biosensor could be used to the detection of cTnI in human serum with lower cost and higher sensitivity, it also might be better potential application prospect based on N, Zn-GQDs to detect other biomarkers.
研究领域:
生物传感器
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心脏病学
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分析化学
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纳米技术
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电化学
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产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Chengfei Zhao,Jiecheng Xiao,Tianhui Liu,Houhui Shi,Quwen Li,Zhipeng Ruan
Uric acid (UA) is a decomposition product of purine nucleotide metabolism in the human body, and is a normal component of urine. Most UA dissolves in the blood, passes through the kidneys and leaves the body in urine. High levels of UA in the blood can lead to hyperuricemia that cause the formation of UA crystals, and result in permanent damage of bone, joint and tissue, and kidney and heart disease. The most typical and common related diseases are that the crystals cause gout in the joints and form kidney stones in the kidneys. In this work, graphene quantum dots (GQDs) was successfully synthesized from citric acid as reaction substrate by pyrolysis method and was used to modify glass carbon electrode (GCE) to prepare an electrochemical sensor for the detection of UA. The electrochemical property of GCE modified with GQDs was characterized by differential pulse voltammetry, and cyclic voltammetry. The electrochemical response of the modified GCE for detecting UA showed a good linear relation in the ranges of 10~1000 μmol/L in phosphate buffer saline (pH=6.5). The as-prepared sensor has the advantages of good selectivity, high sensitivity and acceptable precision for the detection of UA, and can be used to detect UA in serum. The developed electrochemical sensor can be considered as a valuable tool for the analysis of UA in human serum, and has the potential to be developed for detecting UA outside the classical diagnostic laboratory. In addition, the electrochemical sensing technology involved in this study can be applied to the detection of UA, which lays a foundation for the further development of portable UA detector and expands the application of electrochemical sensing technology in laboratory medicine.
研究领域:
分析化学
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生物化学
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电化学
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医学诊断
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2024
·
IF 2.6
Wang Yaru,Li Shuhuai,Ma Xionghui,Pang Chaohai,Wu Yuwei,Wang Mingyue,Li Bei,Liu Sixin
Fluorescence intensity and selective recognition ability are crucial factors in determining the analytical techniques for fluorescent probes. In this study, a core–shell fluorescent material, composed of silver nanoparticles@nitrogen-doped graphene quantum dots (Ag NPs@N/GQDs), was synthesised using mango leaves as the raw material through a thermal cracking method, resulting in strong fluorescence luminescence intensity. By employing noradrenaline as a template molecule and using a surface molecular imprinting technique, a molecularly imprinted membrane (MIP) was formed on the surface of the fluorescent material, that was subsequently eluted to obtain a highly specific, fluorescent probe capable of recognising noradrenaline. The probe captured various concentrations of noradrenaline using the MIP, which decreased the fluorescence intensity. Then a method for detecting trace amounts of noradrenaline was established. This method exhibited a linear range from 0.5 –700 pM with a detection limit of 0.154 pM. The proposed method was implemented in banana samples. Satisfactory recoveries were confirmed at four different concentrations. The method presented a relative standard deviation (RSD) of less than 5.0%.
研究领域:
分析化学
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生物医学
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食品科学
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DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
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2015
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IF 6.409
Yong Liu,Kai Yan,Otieno Kevin Okoth,Jingdong Zhang
A photoelectrochemical (PEC) sensing platform for chloramphenicol (CAP) detection was constructed using nitrogen-doped graphene quantum dots (N-GQDs) as transducer species and label-free aptamer as biological recognition element . N-GQDs, synthesized via a facile one-step hydrothermal method , were explored to achieve highly efficient photon-to-electricity conversion under visible light irradiation . The obtained N-GQDs were characterized by transmission electron microscopy (TEM), which displayed a narrow size distribution with a mean diameter of 2.14 nm. The X-ray photoelectron spectroscopic (XPS) and Fourier transform infrared spectroscopic (FT-IR) analysis confirmed that nitrogen was successfully doped in GQDs. The UV–visible absorption spectra indicated that nitrogen doping obviously enhanced the absorption of GQDs in visible light region. As a result, the PEC activity of GQDs was promoted by nitrogen doping. Additionally, the π-conjugated structure of N-GQDs provided an excellent platform for aptamer immobilization via π–π stacking interaction. Such an aptamer/N-GQDs based sensor showed a linear PEC response to CAP concentration in the range of 10–250 nM with a detection limit (3 S/N) of 3.1 nM. The developed PEC aptasensor exhibited high sensitivity and selectivity , good reproducibility and high stability.
研究领域:
分析化学
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环境科学
·
生物传感器
·
材料科学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Wenjuan Wang,Yeqing Xu,Xiqing Liu,Long Peng,Ting Huang,Yongsheng Yan,Chunxiang Li
Ratiometric fluorescence imprinting sensors (GQDs/CdTe@MIPs) were successfully constructed by precipitation polymerization method for the recognition and detection of oxytetracycline (OTC) in milk samples. GQDs/CdTe@MIPs were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), fourier transform infrared (FT-IR), thermal gravity analysis (TGA), UV–visible spectroscopy (UV–vis) and X-ray photoelectron spectroscopy (XPS) techniques. A satisfying linear relationship under 0–80 μM OTC concentration (R 2 = 0.99699) was exhibited. High sensitivity was showed with the limit of detection of 3.5 nM and high recovery ranged from 99.93% to 100.20%. In addition, the selectivity of GQDs/CdTe@MIPs to OTC was well comparing with other antibiotics. With the injection of different concentrations of OTC, the fluorescent color change of GQDs/CdTe@MIPs under the 365 nm UV lamp further verified that GQDs/CdTe@MIPs were used successfully for the visual detection to OTC in milk samples.
研究领域:
分析化学
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材料科学
·
食品安全
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2020
·
IF 2.65
Liqun Cheng,Xiaoping Dong
Photocatalysis technology has stimulated extensive research interest in various fields, but several limitations, such as the inefficient separation ratio of photo-generated charges and the possible release of metal ions from metal oxides or sulfides, need to be overcome before its practical application. Herein, we fabricated a metal-free carbonaceous composite photocatalyst via modification of 2D polymeric carbon nitride (PCN) with 0D graphene quantum dots (GQDs) by an ultrasound-assisted route. Characterization results clearly indicated the formation of 0D/2D composite structure with an intimately contacted interface, and the type II band structure promotes the charge separation between PCN and GQDs. As a result, an enhanced photocatalytic activity for degradation of dyes was achieved by the GQDs/PCN in comparison to the single PCN and GQDs. Furthermore, multiple cycling tests reflected the GQDs/PCN had relatively high photocatalytic durability. This study provides a facile method to construct carbonaceous composite and demonstrates it is a promising photocatalyst for environmental remediation.
研究领域:
材料科学
·
环境科学
·
化学
·
纳米技术
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产品关联
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Jie Cao,Weimin Hu,Qiuyan Li,Guo Lv,Weifeng Chen,Xiang Liu
Utilization of nonprecious metals to replace precious metals in the catalytic hydrolysis of hydrogen storage materials causes wide attention. Herein, nonprecious bimetallic nanoparticles loaded on N-doped graphene quantum dots (Co-Ni/N-GQDs) have been synthesized and applied in the hydrolysis of NH 3 BH 3 for the first time. It is demonstrated that Co-Ni/N-GQDs exhibit the obvious bimetallic synergies in the hydrolysis of NH 3 BH 3 , and the total turnover frequency (TOF) value reaches 19.94 mol H2 ⋅ mol Cat − 1 ⋅ min − 1 via the optimized design. This work first explored the catalytic performance for the nonprecious bimetallic nanoparticles loaded on N-GQDs in the hydrolysis of NH 3 BH 3 , greatly facilitating the development of both nonprecious metals and N-GQDs in the hydrogen evolution.
研究领域:
材料科学
·
催化化学
·
氢能研究
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DOI
高影响因子
危险品化学品经营许可证（带存储）