JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Xiaoyan Wei,Yawen Wang,Yu Huang,Caimei Fan
Metal–organic frameworks (MOFs) with the advantage of high surface area are attracting growing concern in photocatalysis , but the limitations of no visible light response and low carrier migration efficiency also exist in MOFs materials. Carbon quantum dots (CQDs) with unique optical properties are a novel class of carbon nanomaterials , which have attracted extensive attention in the field of photocatalysis . In this work, compositing with CQDs for realizing MOFs visible-light photocatalytic NO performance was elucidated. We synthesized CQDs/ZIF-8 composite via a simple surface soaking approach, and the 0.5-CQDs/ZIF-8 composite showed the best removal performance of NO, which was ∼43%. The effect of CQDs on boosting visible-light photocatalytic activity of ZIF-8 was explored based on the photocurrent test, electrochemical impedance spectra, activity tests and radical trapping experiment under different monochromatic light irradiation , up-conversion photoluminescence spectra of CQDs, and electron spin resonance spectroscopy measurement. These results demonstrated compositing with CQDs is an effective way to boost the visible-light photocatalytic activity of ZIF-8, in which CQDs improves the visible light utilization and carrier separation efficiency. Apart of that, the results fully proved that the up-conversion effect indeed played a role in driving ZIF-8 into visible light response owing to the still working holes (h + ) under 500 nm of monochromatic light irradiation. The possible NO x removal mechanism over CQDs/ZIF-8 composite was then proposed in the work.
研究领域:
材料化学
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环境催化
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纳米材料科学
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光化学
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大气污染控制
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表面科学
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物理化学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Cong Luo,Jianghua Yang,Jinling Li,Shijie He,Bowen Meng,Tao Shao,Qiankun Zhang,Dongxia Zhang,Xibin Zhou
A strategy for the synthesis of Au@N-CQDs@Pd three-layer core-shell nanoparticles without the use of any surfactant is proposed in this work. Herein, N-doped carbon quantum dots (N-CQDs) are used as the reducing agent, stabilizing agent, and shape-directing agent. The morphology and structure of the final product were characterized by Transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and X-ray powder diffraction (XRD). The electrocatalytic test indicates the as-synthesized Au@N-CQDs@Pd 20 exhibites excellent activity for methanol oxidation in alkaline media, which is approximately 6 times higher than commercial Pd/C. And its resistance to CO and stability are also greatly improved. This work provides a simple and straightforward approach to prepare bimetallic core-shell electrocatalyst by using CQDs with high catalytic activity for alkaline fuel cells .
研究领域:
材料科学
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电化学
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纳米技术
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产品关联
DOI
高影响因子
SOLID STATE SCIENCES
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2023
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IF 3.5
Huadong Liu,Hao Sun,Du Ke Zhen,Cheng Jing liang,Sun XiaoYu
Monoclinic bismuth vanadate (m-BiVO 4 ) is a well-known photocatalytic material. However, its poor charge transport and photogenerated electron hole rapid recombination limit the application of m-BiVO 4 . In this paper, we successfully constructed a novel copper-sulfur co-doped carbon quantum dots (Cu, S-CQDs)/BiVO 4 nanocomposite through a facile and efficient route, which significantly improved the photocatalytic performance of BiVO 4 . The physicochemical properties of Cu, S-CQDs and Cu, S-CQDs/BiVO 4 samples were studied by various characterization. It was concluded from the degradation experiments that the photocatalytic degradation rate of rhodamine B reaches 99% in 60 min under natural light. The degradation curve compounds the quasi-primary kinetic model, and the kinetic coefficient of degradation is 0.07831 min −1 , which is 5.37 times than that of pure BiVO 4 . Moreover, the free radical scavenging experiments reveal that the hole and superoxide radicals play a major role in the photocatalysis process. After four cycles, the activity of photocatalyst exhibits high stability, which is extremely important for the photocatalytic process. In the summery, the prepared Cu, S-CQDs/BiVO 4 has many advantages, such as environmental-friendly, low cost and a wide range of applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Zihan Wang,Li Zhang,Yumin Hao,Wenjuan Dong,Yang Liu,Shengmei Song,Shaomin Shuang,Chuan Dong,Xiaojuan Gong
The fluorescent sensor, especially ratiometric fluorescent sensor, is one of the most important applications for CQDs , which is becoming a research hotspot. Herein, carbon quantum dots co-doped with nitrogen, phosphorus and chlorine (NPCl-CQDs) were synthesized by acid-base neutralization reaction exothermic carbonization method. The as-fabricated NPCl-CQDs could emit blue fluorescence and possess excellent fluorescence properties. Based on the FRET , multifunctional and ratiometric fluorescent sensors for “on-off-on” sequential determination of riboflavin , Ag + , and Cys with good selectivity and high sensitivity were established. The linear range of riboflavin, Ag + , and Cys are 0.50–10.18 μM and 15.89–27.76 μM, 0.66–1.46 mM and 1.50–4.20 mM, and 0.01–0.15 μM and 0.15–0.36 μM with the limit of detection of 3.50 nM, 26.38 μM, and 0.96 nM, respectively. Furthermore, the sensors were successfully used to determine riboflavin, Ag + , and Cys in tablets, river water, and human urine with the recoveries of 95.2–104.0%, 95.6–102.0%, and 94.8–106.4%, respectively. More importantly, the as-constructed “on-off-on” NPCl-CQDs-based ratiometric fluorescent sensors were applied for detecting riboflavin, Ag + , and Cys in HeLa cells with satisfying results. The finding of this study shows the feasibility and effectiveness of the NPCl-CQDs as the available ratiometric fluorescent sensors for the determination of riboflavin, Ag + , and Cys in real samples and living cells.
研究领域:
分析化学
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纳米技术
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生物医学工程
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荧光光谱
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2024
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IF 5.5
Shiyu Jia,Ziyang Liu,Yuanpan Gao,Ruoran Zhang,Rui Zhu,Shanshan Gao,Peipei Guan,Xuanran Geng,Ke Tian,Shouli Bai
The design of photoanode materials to achieve efficient water splitting is a current research hotspot in photoelectrochemical (PEC). In this work, we designed and prepared an α-Fe 2 O 3 /BiVO 4 heterostructure modified by carbon quantum dots ((α-Fe 2 O 3 /BiVO 4 /CQDs)) as the photoanode. The modification of CQDs can broaden the sunlight absorption ability and dramatically enhance the water oxidation kinetics of α-Fe 2 O 3 /BiVO 4 /CQDs. The optimized photoanode demonstrated a photocurrent density of 1.32 mA·cm −2 at 1.23 V vs. RHE, which is 2.2 times than pristine α-Fe 2 O 3 (0.6 mA·cm −2 ) photoanode. The IPCE value above 29.4 % at 400 nm, and the onset potential is negatively shifted by 243 mV for α-Fe 2 O 3 /BiVO 4 /CQDs. The improved performance is mainly due to the α-Fe 2 O 3 /BiVO 4 heterojunction to achieve effective separation of photogenerated carriers in the bulk phase and CQDs to improve light utilisation and OER kinetics of the photoanode.
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
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Bin Li,Aolin Wu,Mengjing Zhou,Ying Wang,Zhigang Hu,Lihua Su
In this paper, nitrogen-doped carbon quantum dots (N-CQDs) were prepared by using citric acid as a carbon source and ethylenediamine as a nitrogen source. Then, N-CQDs were added into a deep eutectic solvent (DES) synthesized from acrylamide (AM), urea (U), and choline chloride (ChCl). The N-CQDs/P(AM-U-ChCl) composite hydrogels were prepared by light polymerization. The chemical composition and microstructure of N-CQDs/P(AM-U-ChCl) composite hydrogels were characterized in detail using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). This article further explored the influence of the content of N-CQDs on the mechanical properties, adsorption properties, and detection performance of the composite hydrogel. The results showed that the composite hydrogels exhibited the best mechanical properties when N-CQDs' content was 0.3 wt%. The adsorption performance of N-CQDs/P(AM-U-ChCl) composite hydrogels for Fe3+ was significantly enhanced due to the carboxyl groups contained in N-CQDs. In detecting tert-butylhydroquinone (TBHQ), the composite hydrogel showed a good linear correlation in the concentration range of 0–200 mg L−1, and the detection limit of TBHQ reached 0.849 mg L−1. This study provides a new idea for preparing composite hydrogel materials with excellent mechanical properties and functionality. Also, it demonstrates their potential application value in heavy metal ion adsorption and organic molecule detection.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2024
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IF 4.4
Huadong Liu,Hao Sun,XiaoYu Sun,Jing liang Cheng
This paper presents a novel tubular microreactor immobilized a photocatalyst to overcome the limitations of low light utilization and the challenges associated with catalyst recovery in traditional photocatalysis reactors. The copper-sulfur co-doped carbon quantum dots (Cu, S-CQDs)/bismuth vanadate (BiVO 4 ) composites were successfully immobilized on the inner surface of the microreactor channel through the sol–gel process. The catalytic layer in the microreactor enlarged the specific surface area and facilitated the mass transfer. Meanwhile, it also greatly reduced the consumption of chemical supplies and eliminated the need for recycling the photocatalyst. The morphology and structural features of the catalytic layer were studied by characterization. Then the photocatalytic performance of the microreactor was evaluated by photocatalytic degradation of Rhodamine B. The photocatalytic kinetics of the photocatalytic reaction in the microreactor was 0.60925, which was 10.49 times greater than that in the macroscopic system. The results showed that the microreactor led to a significant improvement in degradation efficiency. The reproducibility experiments conducted on the microreactor system further demonstrate its excellent stability. In short, integrating the beneficial properties of microreactors with Cu, S-CQDs/BiVO 4 exhibits highly promising prospects of photocatalytic applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2026
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IF 5.1
Yun Qin,Li Zhang,Yu Ren,Yihao Wu,Yiping Wu,Ying Wen,Xinling Liu,Xiaoyu Guo,Haifeng Yang
Rational design of a multifunctional mSiO 2 -CQDs-Au@Ag nanocomposite. • Au@Ag and CQDs synergistically strengthen the SERS response. • The substrate achieves an enhancement factor of 1.0 × 10 9 . • Amisulpride in seawater is detected at 6.1 × 10 −9 mol·L −1 . • Charge transfer assisted enhancement is revealed experimentally. Pharmaceutically active compounds (PhACs) are receiving increasing attention because of their widespread use and continuous release into aquatic environments. Among them, amisulpride (AMI), a widely prescribed antipsychotic drug, is a plausible aquatic contaminant due to its release through wastewater and incomplete metabolic removal. Herein, Au@Ag core–shell nanoparticles were prepared using β-cyclodextrin as both the reducing agent and stabilizer, and further assembled with carbon quantum dots (CQDs) and mesoporous silica (mSiO 2 ) to construct a composite Surface-enhanced Raman scattering (SERS) substrate, mSiO 2 -CQDs-Au@Ag, for sensitive AMI detection. The substrate exhibited strong enhancement capability, with an enhancement factor (EF) as high as 1.0 × 10 9 . When applied to the detection of AMI in seawater, the proposed platform achieves a low limit of detection (LOD) of 6.1 × 10 −9 mol·L −1 , together with a good linearity (R 2 = 0.993). Combined theoretical and experimental analyses indicated that CQDs not only participate in interfacial charge transfer, but also contribute to analyte adsorption. This work offers a rational strategy for constructing semiconductor-integrated SERS platforms for sensitive detection and demonstrates its promising potential for environmental monitoring of emerging organic pollutants. Download: Download high-res image (91KB) Download: Download full-size image
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DOI
高影响因子
IEEE SENSORS JOURNAL
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2026
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IF 4.5
Lingling Fan,Cunhong Cen,Yuru Wu,Xiaohua Deng,Yuxuan Shi,Yuxing Huang,Xiaohong Tan,Shidong Li,Guiyin Li
Hepatocellular carcinoma (HCC) remains one of the most lethal malignancies worldwide, underscoring the urgent demand for early diagnostic strategies to improve patient survival rates. Glypican-3 (GPC3), a highly specific biomarker of HCC, has emerged as a promising target for early detection. Herein, we developed an innovative magnetic colorimetric aptasensor using ferrosoferric oxide@carbon quantum dots (Fe3O4@CQDs) nanocomposites. The Fe3O4@CQDs nanocomposites combine the magnetic properties of Fe3O4 with the unique optical characteristics of CQDs, exhibiting intrinsic peroxidase‑like activity. The animo-modified GPC3 aptamer (GPC3Apt) was covalently conjugated onto the Fe3O4@CQDs nanocomposites surface via EDC/NHS chemistry to form the recognition probe (Fe3O4@CQDs-GPC3Apt). Upon specific binding between the aptamer and GPC3, the resulting complexes (Fe3O4@CQDs-GPC3Apt-GPC3) modulate the catalytic oxidation of o-phenylenediamine (OPD) by H2O2, generating a yellow oxOPD product whose absorbance intensity correlated with GPC3 concentration. The proposed colorimetric aptasensor demonstrated a detection limit of 3.16 ng/mL and a linear range of 10–200 ng/mL, with high specificity against interfering proteins. It was successfully validated in human serum samples, yielding recoveries between 99.27% and 109.33%. Owing to its operational simplicity and cost‑effectiveness, this platform offers transformative potential for point-of-care HCC screening. Beyond advancing GPC3 detection, the work provides a flexible design paradigm that can be adapted for assays targeting other disease biomarkers.
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DOI
高影响因子
Materials Today Nano
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2025
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IF 8.2
Yinchun Fang,Xianglu Zhao,Xuchen Tao
Photonic crystals (PCs) structural color coatings have been widely studied due to their advantages of environmental friendliness, resistance to fading and high color saturation. However, they still have problems such as single function and being easily affected by the external environment. In this research, fluorescent SiO 2 @polypyrrole@carbon quantum dots (SiO 2 @PPy@CQDs) microspheres were synthesized by incorporating CQDs into SiO 2 @PPy microspheres, which were self-assembled on the white cotton fabrics to form an amorphous photonic structure (APS). These APS exhibited angle-independent structural colors under natural light and blue fluorescence under UV light. The structural colored cotton fabrics obtained superhydrophobicity with a water contact angle (WCA) greater than 150° and self-cleaning function after treatment with polydimethylsiloxane (PDMS). The anti-counterfeiting structural colored fabrics with single response to UV light and dual responses to water/UV light based on SiO 2 @PPy@CQDs, SiO 2 @PPy and SiO 2 microspheres were prepared by using multi-layer alternating atomization deposition and PDMS hydrophobic treatment processes. This study provides a novel approach for developing multifunctional structural color coatings with self-cleaning and anti-counterfeiting based on fluorescent organic/inorganic hybrid microspheres.
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2025
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IF 1.3
Lifen Meng,Yinying Zhang,Mengting Su
The determination of vitamin B6 (VB6) in food, health products, and pharmaceuticals is of great significance because it plays a crucial role in maintaining health and is a necessary condition for dietary intake. Therefore, the study uses L-Histidine, citric acid, potassium permanganate, and tetraethyl silicate as carbon source and Mn, Si source to prepare Mn, Si-CQDs by a hydrothermal method. The characteristics of the Mn,Si-CQDs are studied by TEM, XPS, FTIR, XRD, and UV-vis spectrum, Mn,Si-CQDs are spherical and well dispersed in aqueous solution, with an average particle size of 5 nm. The effect of different pH and storage time on the fluorescence intensity of Mn, Si-CQDs indicates that Mn, Si-CQDs have good fluorescence stability. The fluorescence of Mn, Si-CQDs can be selectively quenched by VB6 without being affected by interfering other substances, within the range of 0.05-20 μg/mL, The quenching degree ratio of Mn, Si-CQDs , F 0 /F, shows a good linear relationship with the concentration of VB6 (F 0 /F=0.19311+0.03723C (R 2 =0.99882)), with a detection limit of 0.037 μg/mL. The recovery rates were 94.21∼98.80% by the spiked recovery experiments, indicating the high sensitivity and selectivity of the Mn,Si-CQDs . During the antibacterial test, the Mn,Si-CQDs exhibite good antibacterial effects on Staphylococcus aureus, Penicillium, Escherichia coli and Saccharomyces cerevisiae .
研究领域:
分析化学
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纳米生物技术
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食品安全
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药物分析
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分子诊断
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抗菌材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
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2025
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IF 3.2
Yanrui Cheng,Nan Yao,Yi Guo,Shifeng Ji,Yunqing Xing,Chunmei Gao
Membrane fouling remains a critical obstacle for the application of polyethersulfone (PES) ultrafiltration in industrial wastewater treatment. In this work, a novel multifunctional composite membrane was developed by co-embedding carbon quantum dots (CQDs) and ZIF-L-derived carbon-doped ZnO (C-ZnO) nanoparticles into a PES matrix via the reverse thermally induced phase separation (RTIPS) method. The optimized membrane M3 contains 0.05 wt% CQDs and 0.02 wt% C-ZnO. It exhibited a remarkably hydrophilic surface with a water contact angle of 51.8°. Compared to membranes fabricated by conventional non-solvent induced phase separation (NIPS), the RTIPS method produced a structure with a highly porous surface and an interconnected sponge-like support, effectively breaking the permeability-selectivity trade-off. The optimized composite membrane exhibited a superior pure water permeability of 1555 L m −2 h −1 while maintaining a high humic acid rejection of 91.9%. This membrane also demonstrated robust long-term antifouling stability and a photocatalytic flux recovery rate of 65.8% under visible light. Furthermore, it achieved nearly 100% antibacterial activity against E. coli and S. aureus , attributed to a dual-defense mechanism combining a physical hydration layer with the chemical action of photocatalysis and Zn 2+ release. These findings highlight the significant potential of this RTIPS-fabricated CQDs/C-ZnO/PES membrane as a robust solution for high-performance wastewater treatment.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）