Small
·
2023
·Vol. 19
·期 33
·2301275
·
IF 13.3
Huaxin Liu,Laiqiang Xu,Hanyu Tu,Zheng Luo,Fangjun Zhu,Wentao Deng,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji
Solid-state polymer electrolytes are highly anticipated for next generation lithium ion batteries with enhanced safety and energy density. However, a major disadvantage of polymer electrolytes is their low ionic conductivity at room temperature. In order to enhance the ionic conductivity, here, graphene quantum dots (GQDs) are employed to improve the poly (ethylene oxide) (PEO) based electrolyte. Owing to the increased amorphous areas of PEO and mobility of Li + , GQDs modified composite polymer electrolytes achieved high ionic conductivity and favorable lithium ion transference numbers. Significantly, the abundant hydroxyl groups and amino groups originated from GQDs can serve as Lewis base sites and interact with lithium ions, thus promoting the dissociation of lithium salts and providing more ion pathways. Moreover, lithium dendrite is suppressed, associated with high transference number, enhanced mechanical properties and steady interface stability. It is further observed that all solid-state lithium batteries assembled with GQDs modified composite polymer electrolytes display excellent rate performance and cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
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高影响因子
APPLIED OPTICS
·
2026
·Vol. 65
·期 14
·4861-4870
·
IF 1.7
Xuefei Xiao,Xuefei Xiao,Xuefei Xiao,Xuefei Xiao,Xingchen Zhou,Xingchen Zhou,Xingchen Zhou,Xingchen Zhou,Zheyuan Gu,Zheyuan Gu,Zheyuan Gu,Zheyuan Gu,Jun Qian,Jun Qian,Jun Qian,Jun Qian,Min Lai,Min Lai,Min Lai,Min Lai,Yan Ma,Yan Ma,Yan Ma,Bo Liu,Bo Liu,Bo Liu,Bo Liu,Bo Liu
This study presents a fiber-optic humidity sensor based on boron and nitrogen co-doped graphene quantum dots (B,N-GQDs). Hydrophilic B,N-GQDs film was fabricated by a hydrothermal method, followed by photo-driven deposition on plastic optical fiber cores. The sensor showed a wide response range (0–85%RH) with high sensitivity (0.0072/%RH), a low detection limit (0.2%RH), high linearity (${R^2} = {0.999}$), and rapid response (2.5 s). The sensor exhibited a low hysteresis and excellent stability. Good stability and promising applications in respiration and skin moisture monitoring were also demonstrated. The sensing mechanism is attributed to humidity-dependent adsorption of water molecules by the abundant hydrophilic groups of the film. This adsorption alters the film’s refractive index and extinction coefficient, modulating the transmitted light intensity via a partial leaky-mode mechanism.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Tianxing Hu,Le Zhang,Wei Wen,Xiuhua Zhang,Shengfu Wang
A specific and sensitive method was developed for quantitative detection of miRNA by integrating horseradish peroxidase (HRP)-assisted catalytic reaction with a simple electrochemical RNA biosensor. The electrochemical biosensor was constructed by a double-stranded DNA structure . The structure was formed by the hybridization of thiol-tethered oligodeoxynucleotide probes (capture DNA), assembled on the gold electrode surface , with target DNA and aminated indicator probe (NH 2 -DNA). After the construction of the double-stranded DNA structure, the activated carboxyl groups of graphene quantum dots (GQDs) assembled on NH 2 -DNA. GQDs were used as a new platform for HRP immobilization through noncovalent assembly. HRP modified biosensor can effectively catalyze the hydrogen peroxide (H 2 O 2 )-mediated oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB), accompanied by a change from colorless to blue in solution color and an increased electrochemical current signal. Due to GQDs and enzyme catalysis, the proposed biosensor could sensitively detect miRNA-155 from 1 fM to 100 pM with a detection limit of 0.14 fM. High performance of the biosensor is attributed to the large surface-to-volume ratio, excellent compatibility of GQDs. For these advantages, the proposed method holds great potential for analysis of other interesting tumor makers.
研究领域:
生物化学
·
分子生物学
·
分析化学
·
癌症研究
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DOI
PubMed
高影响因子
Journal of Nanomaterials
·
2017
·
IF 1.871
Yaoyao Yang,Jiali Zhang,Fangwei Zhang,Shouwu Guo
Composites of gold nanoparticles and graphene quantum dots (AuNPs/GQDs) exhibit excellent dispersibility in aqueous solutions. Thus, it is difficult to separate them from wet reaction systems when they are used as catalysts. To resolve this issue, in this study, an AuNPs/GQDs composite was immobilized on silicon dioxide through the hydrothermal method, which involved the formation of an amide bond between the surface GQDs of the AuNPs/GQDs composite and the amino group of the silane. The as-synthesized AuNPs/GQDs/SiO2 composite was found to be suitable for use as a heterogeneous catalyst for the oxidation of veratryl alcohol in water and exhibited catalytic activity comparable to that of bare AuNPs/GQDs as well as better recyclability.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
npj Clean Water
·
2025
·Vol. 8
·期 1
·1-9
·
IF 11.4
Sun Yu-Ze,Liu Jin-Hua,Li Zhi,Qiu Li-Peng,Song Jia-Bin,Wang Shuai-Jie,Zhang Zhen,Li Ru,Zhang Hong-Di,Han Wen-Peng,Zhang Jun,Long Yun-Ze
In this study, graphene quantum dots/titanium dioxide (GQDs/TiO 2 ) fiber membranes with engineered oxygen vacancies were fabricated using a combination of electrospinning and solvothermal techniques. Oxygen vacancies, as key active sites, enabled spin polarization during the photocatalytic reaction, and the material’s spin polarization was verified by X-ray Absorption Spectroscopy (XAS) and Density Functional Theory (DFT). For the first time, the effects of high magnetic fields (1000–5000 mT) on photocatalytic performance were systematically explored. The findings reveal that the magnetic field markedly enhances spin polarization, facilitating synergistic interactions between oxygen vacancies and photogenerated electrons while significantly suppressing carrier recombination. Under these conditions, the GQDs/TiO 2 fiber membranes achieved a remarkable 52.44% increase in the degradation rate of methylene blue compared to zero-field conditions. Additionally, the study introduces the concept of magnetic field-induced progressive energy level modulation, wherein defect state energy levels undergo gradual adjustment before stabilization under magnetic influence. This work provides critical insights into radical generation mechanisms driven by the interplay between magnetic fields and oxygen vacancies, offering a novel pathway for designing advanced photocatalysts with broad applications in water pollution treatment and sustainable energy solutions.
研究领域:
材料科学
·
纳米技术
·
环境科学
·
物理化学
·
凝聚态物理
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DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Zichen Zheng,Kewei Liu,Yiwen Zhou,Kaichun Xu,Marc Debliquy,Chao Zhang
Creating high-performance gas sensors for heptanal detection at room temperature demands the development of sensing materials that incorporate distinct spatial configurations, functional components, and active surfaces. In this study, we employed a straightforward method combining hydrothermal strategy with ultrasonic processing to produce mesoporous graphene quantum dots/bismuth antimonate (GQDs/BiSbO4) with nanorod cluster forms. The BiSbO4 was incorporated with appropriate contents of GQDs resulting in significantly improved attributes such as heightened sensitivity (59.6@30 ppm), a lower threshold for detection (356 ppb), and quicker period for response (40 s). A synergistic mechanism that leverages the inherent advantages of BiSbO4 was proposed, while its distinctive mesoporous hollow cubic structure, the presence of oxygen vacancies, and the catalytic enhancement provided by GQDs lead to a marked improvement in heptanal detection. This work introduces a straightforward and effective method for crafting sophisticated micro–nanostructures that optimize spatial design, functionality, and active mesoporous surfaces, showing great promise for heptanal sensing applications.
研究领域:
材料科学
·
化学
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PubMed
高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2024
·Vol. 71
·期 6
·3697-3704
·
IF 2.9
Xiaofen Xu,Gang He,Leini Wang,Wenhao Wang,Can Fu,Yujiao Li
This study investigates the effect of oxygen plasma treatment on the surface morphology, electrical properties, and stability of amorphous graphene quantum dots (GQDs)-modulated InGaZnO (IGZO) thin-film transistors (TFTs) prepared by all-solution method. The weak threshold voltage shifts (
$\Delta {V}_{\text {TH}}\text {)}$
of the oxygen plasma-treated GQDs-IGZO TFTs under positive bias stress (PBS), negative bias stress (NBS), positive bias illumination stress (PBIS), and negative bias illumination stress (NBIS) show a significant improvement of the bias-induced instability. Based on the energy band diagrams, this work demonstrates that O
$_{{2}}^{-}$
and H2O+ are formed in the back channel under PBS and NBS conditions in addition to ionized oxygen vacancy (V
$_{\text {o}}\text {)}$
defects at the GQDs–IGZO/ZrOx interface, leading to the gate bias instability, which can be effectively suppressed by the oxygen plasma treatment to improve the stability of the device. From the experimental results, it can be seen that the electrical properties, such as field effect mobility (
$\mu _{\text {FE}}\text {)}$
, on-/off-current ratio (
${I}_{\text {on}}$
/
${I}_{\text {off}}\text {)}$
, and subthreshold fluctuations, are significantly improved by the passivation of interfacial trap density and bulk trap defects by oxygen plasma treatment. To confirm the potential applications of IGZO-TFTs in logic circuits, inverter based on GQDs-IGZO/ZrOx has been integrated, demonstrating good dynamic response characteristics and narrow transition width. Low-frequency noise (LFN) analyses of TFTs have revealed that mobility fluctuations are the main source of noise. As a result, it can be concluded that the facile oxygen plasma treatment strategy is a promising technique to optimize device performance and has demonstrated potential applications in preparing GQDs-IGZO TFTs with high performance.
研究领域:
材料科学
·
电子工程
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 11
·2798
·
IF 5.076
Huaidong Wang,Chong Qi,Ailing Yang,Xiaoxu Wang,Jie Xu
High fluorescent graphene quantum dots (GQDs) are promising in bioimaging and optoelectronics. In this paper, bright blue fluorescent N-doped GQDs were synthesized using a ultrasonic-assisted hydrothermal method. The morphology, structure, surface chemistry, optical properties, and stability subject to photo-bleaching, temperature, pH and preservation period for the N-GQDs were investigated in detail using various microscopy and spectroscopy techniques. The results showed that the N-GQDs possessed an average size of 2.65 nm, 3.57% N doping, and up to 54% quantum yield (QY). The photoluminescence (PL) spectra of the N-GQDs are excitation dependent when excited in the range of 300–370 nm and excitation independent in the range of 380–500 nm for the core and surface states emission. The N-GQDs showed excellent photo-bleaching resistance and superior photo-stability. At room temperature and in the pH range of 3–8, the fluorescence of the N-GQDs was almost invariable. The N-GQDs can be stably preserved for at least 40 days. The average decay lifetime of the N-GQDs was 2.653 ns, and the radiative and nonradiative decay rate constants were calculated to be 2.04 × 108s−1and 1.73 × 108s−1, respectively. The PL mechanism was qualitatively explained. The N-GQDs was used for cell imaging, and it showed good results, implying great potential applications for bioimaging or biomarking.Keywords:ultrasonic-assisted hydrothermal;nitrogen doped graphene quantum dots;optical properties;photo-stability;cell imaging
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Huixue Wang,Jinya Liu,Wei Chen,Jintong Na,Yong Huang,Guiyin Li
Glypican-3 (GPC3), a heparin sulfate proteoglycan, is a potential diagnostic and therapeutic target for hepatocellular carcinoma. In this paper, a novel fluorescent aptasensor for GPC3 detection is constructed via [email protected] quantum dots–labeled GPC3 aptamer ( [email protected] Apt ) as a fluorescence probe. First, [email protected] is screened out with higher fluorescence intensity, which emits bright blue fluorescence under ultraviolet light. Then, the fluorescence-labeled [email protected] Apt probe is formed by the combination of amination GPC3 Apt and [email protected] using EDC/NHS coupled reaction. Under hydrogen bond and π-π interaction/stacking, the fluorescence of [email protected] Apt could be quenched by reductive graphene oxide (RGO) with the help of the photoinduced electron transfer and the fluorescence resonance energy transfer mechanism. In the presence of GPC3, the [email protected] Apt specifically recognizes and binds to GPC3, giving rise to the change of secondary structure of GPC3 Apt to form the GPC3/GPC3 Apt [email protected] complex, which would lead to the disintegration of the [email protected] Apt -RGO compound. Therefore, the energy transfer process is blocked and the fluorescence intensity is restored, enabling a highly sensitive response to GPC3. When the concentration of GPC3 is from 5.0 ng/mL to 150.0 ng/mL, the fluorescence recovery rate is well linearly related to GPC3 concentration with the limit of detection of 2.395 ng/mL (S/N = 3). This strategy shows recoveries from 98.31% to 101.89% in human serum samples and provides simple, fast and cheap analysis of GPC3, which suggests that it has great potential applications in clinical diagnosis for hepatocellular carcinoma.
研究领域:
生物化学
·
分子诊断
·
纳米医学
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 7
·1-16
·
IF 2.5
Shan Chuanfu,Liu Ziyi,Li Fuchao,Jia Wenhan,Cai Gaotuo,Li Ming,Tang Tao,Li Shuai,Wen Jianfeng,Hu Guanghui,Jiang Li,Li Xinyu
TiO 2 -based materials are important photocatalysts but the rapid recombination of photoexcited electron–hole pairs, and the wide band gap both limit their photocatalytic activities. In this work, p-type phosphorus-doped graphene quantum dots (P-GQDs, 5~20 nm) were combined with n-type TiO 2 nanoparticles (20~50 nm) and n-type silver iodide (AgI, 100~200 nm) by a facile sonication and precipitation process to yield a novel ternary photocatalyst TiO 2 /P-GQDs/AgI with n-p-n heterojunctions. The morphologies, structures, optical properties, and chemical environments of photocatalysts were all studied. The resulting ternary photocatalyst exhibited enhanced visible photocatalytic activity toward the degradation of methyl orange (MO), estimated to 70.4-fold that of pure TiO 2 . By contrast, the photocatalytic activities of TiO 2 /GQDs with an n-n heterojunction, TiO 2 /P-GQDs with a p-n heterojunction, and TiO 2 /GQDs/AgI (30%) with an n-n-n heterojunction showed 4.4-fold, 5.3-fold, and 14.2-fold higher than those of TiO 2. The electrochemical and optical measurements revealed that the enhanced photocatalytic activity was linked to promoted charge carrier separation by n-p-n heterojunctions coupled with the increased absorption in the visible region. Overall, the new band structure connected in series p-n heterojunctions looks promising as a highly efficient photodegradation system for future use in decontamination of polluted water. Graphical abstract
研究领域:
材料科学
·
环境科学
·
光催化技术
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Rongqian Meng,Qiaoling Li,Shengjian Zhang,Jianke Tang,Chunlei Ma,Riya Jin
A glassy carbon electrode (GCE) modified with graphene quantum dots (GQDs) and poly (3, 4- ethylenedioxythiophene) (PEDOT) bilayer films (GQDs/PEDOT/GCE) was constructed and used as a novel electrochemical sensor for rutin detection. The GQDs/PEDOT/GCE sensor was fabricated by two- step electrodeposition and was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). Compared with individual GQDs/GCE and PEDOT/GCE, the current response of the composite electrode to rutin increased by about 10 times and 3 times respectively. The composite electrode exhibited a strong electrical response toward rutin redox due to the cooperative action of the large surface area of the GQDs which allowed strong analyte adsorption and the high electroconductivity of PEDOT. The current response of the GQDs/PEDOT/GCE electrochemical sensor was more linear at rutin concentrations between 0.05 μM and 10 μM and had a detection limit of 11 nM. The sensor also presented a high selectivity, high stability, and excellent recovery rate and could be used for the effective and reliable analysis of rutin in real samples.
研究领域:
分析化学
·
生物医学工程
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高影响因子
Biosensors-Basel
·
2025
·Vol. 15
·期 3
·184
·
IF 5.6
Jianlei Chen,Tianruo Zhang,Yong Xu,Hao Li,Hongwu Cui,Xinguo Zhao,Yun Zhou,Keming Qu,Zhengguo Cui
In this work, a novel molecularly imprinted electrochemical sensor was proposed based on molecular imprinting technology for the detection of sulfamethazine. A glassy carbon electrode was modified with a composite material of carbon nanotubes and graphene quantum dots to effectively improve sensitivity. The molecularly imprinted electrochemical sensor was then prepared by electropolymerization using sulfamethazine as the template and o-phenylenediamine as the functional monomer on the modified electrode. Under optimal measurement conditions, electrochemical tests of different sulfamethazine concentrations (0.5 μM–200 μM) showed excellent linearity and a detection limit of 0.068 μM. In addition, the sensor demonstrated satisfactory selectivity, stability, and reusability. Furthermore, the sensor was applied to the spiked analysis of sulfamethazine in grouper aquaculture water, achieving recovery rates between 95.4% and 104.8%, with a relative standard deviation (RSD) of less than 4.14%. These results indicated that the developed method was effective for the analysis of sulfamethazine in aquaculture seawater, providing a new approach for the detection of antibiotic residues in seawater samples.
研究领域:
分析化学
·
环境科学
·
水产养殖
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PubMed
高影响因子
危险品化学品经营许可证（带存储）