CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Gang Liu,Sheng Xu,Wenting Li,Zhenxi Wang,Jinlong Cui
In order to expand the photoresponsive spectrum of TiO 2 and improve its catalytic activity under visible light, the hollow urchin-like composites of TiO 2 @g-C 3 N 4 /GQDs (TCN/GQDs) with a core-shell structure heterojunction was synthesized through a hydrothermal method and calcination. Potassium titanium oxalate, melamine, and citric acid were utilized as the raw materials for this synthesis process. The TCN/GQDs composites were subjected to a range of analyses to examine their microstructure and photoelectric properties. The findings indicated that the synthesized composites effectively enhanced the absorption spectrum of TiO 2 in the visible light range by creating the stable heterojunctions among TiO 2 , g-C 3 N 4 and GQDs. Additionally, the ability of these composites to degrade toxic organic pollutants under visible light was studied by using several different organic dyes and antibiotics. The results demonstrated that the TCN/GQDs composites exhibited efficient visible light catalytic degradation capability on organic pollutants, and the degradation efficiency could approach to 100 % under visible light in a short time. Furthermore, the photocatalyst exhibited hardly change of degradation efficiency towards organic pollutants even after 5 cycles of testing, suggesting its commendable performance in visible light catalysis and potential for repeated utilization.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xin Hai,Zhiyong Guo,Xin Lin,Xuwei Chen,Jianhua Wang
A fluorescent probe TPA@GQDs is fabricated by the conjugation of terephthalic acid (TPA) on the surface of graphene quantum dots (GQDs). The TPA@GQDs probe not only has favorable dispersibility but also exhibits excellent fluorescence stability over a wide pH range and high ionic strength and favorable antiphotobleaching ability. The great fluorescence enhancement of TPA@GQDs induced by the reaction between TPA and hydroxyl radicals makes the TPA@GQDs a powerful probe for the sensitive assay of hydroxyl radicals, giving rise to a low detection limit down to 12 nmol L–1. Meanwhile, the obtained fluorescent TPA@GQDs probe shows low cytotoxicity and favorable biocompatibility. Its potential in bioimaging is demonstrated by the quantitative fluorescent imaging of hydroxyl radicals in living HeLa cells under different circumstances, which enables the opportunities to study hydroxyl radicals dynamics in living cells.
研究领域:
生物化学
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细胞生物学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Chunlin Wen,Zhenhua Tang,Tingsu Liu,Fan Qiu,Yan-Ping Jiang,Xin-Gui Tang,Yi-Chun Zhou,Xiangjun Xing,Ju Gao
Recently, Ga 2 O 3 -based devices with a wide bandgap have gained great attention in power semiconductor devices. However, Ga 2 O 3 -based devices with the substable crystalline phase and high performances need be further developed and discussed. In this work, the α-Ga 2 O 3 thin films and GQDs/α-Ga 2 O 3 heterojunctions were prepared by magnetron sputtering on the transparent FTO substrates with a buffer TiO 2 layer. And, the good self-powered deep-ultraviolet photodetection performance and mechanisms were discussed in the GQDs/α-Ga 2 O 3 /α-TiO 2 /FTO devices: its responsivity to 254 nm UV light can reach 1.72 mA/W at a bias voltage of 0 V, a normalized detection rate of 1.7 × 10 10 Jones and the light-to-dark current ratio (PDCR) of ∼1 were achieved due to the change of heterojunction energy band type from II to I. Moreover, the good self-powered deep UV photodetection for GQDs/α-Ga 2 O 3 /α-TiO 2 /FTO devices were demonstrated: a PDCR of 1.1 × 10 3 , a self-powered responsivity (R) improved by a factor of 5 to 8.7 mA/W, the rise time (τ r )/fall time (τ f ) of 86/39 ms, and a normalized detectivity (D*) with an improved magnitude of 1.3 to 2.3 × 10 11 Jones were achieved by constructing GQDs/α-Ga 2 O 3 heterojunctions on the outer surface of α-Ga 2 O 3 thin film. These results can provide a reference for the future development of Ga 2 O 3 thin film devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 38
·期 2
·368-379
·
IF 2.909
Gao Jia,Zhang Yuan,Feng Wenjing,Zhang Ying,Cheng Cui,Han Xiao
Surface amino-rich GQDs-ε-PL is prepared by changing the addition amount of ε-PL. Then, GQDs-ε-PL@4-arm PEG-BA/QCS hydrogels (GQDs-ε-PL@Gel) are synthesized through dynamic imine bonds cross-linking. The sol can transform quickly to gel and the gelation time can be controlled by adjusting the specific gravity of the input raw materials to water. FT-IR and thermogravimetric analyses indicate the successful synthesis of GQDs-ε-PL and GQDs-ε-PL@Gel. The microstructure observation reveals that GQDs-ε-PL has a sheet-like structure with an average size of 65 nm, while GQDs-ε-PL@Gel has a porous network structure. Both GQDs-ε-PL and GQDs-ε-PL@Gel have good fluorescence stability, photothermal and cytocompatibility, and display better antibacterial effect against Escherichia coli , Staphylococcus aureus and Pseudomonas aeruginosa through chemical and photothermal synergistic sterilization. More importantly, GQDs-ε-PL@Gel can repeatedly self-heal after being damaged, which is more beneficial to provide an effective wound closure environment for wounds and to be used as wound dressings.
Graphical abstract
研究领域:
材料科学
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生物医学工程
·
纳米技术
·
抗菌研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Jing-jing Li,Lei Shang,Li-Ping Jia,Rong-Na Ma,Wei Zhang,Wen-Li Jia,Huai-Sheng Wang,Ke-Hua Xu
Liver cancer is one of the factors that threaten human life. Highly up-regulated in liver cancer (HULC), a kind of long non-coding RNA (lncRNA), is regarded as a favorable noninvasive biomarker for the early diagnosis of hepatocellular carcinoma (HCC). So a strategy focused on improving the sensitivity of HULC detection is urgently desired. In this work, a highly sensitive electrochemiluminescent (ECL) sensor was constructed using [email protected] core-shell nanoparticles/graphene quantum dots ( [email protected] /GQDs) as a signal indicator to detect HULC. Compared with the individual gold or silver nanoparticles , [email protected] core-shell nanoparticles exhibited large specific surface area, better catalysis and excellent electronic transmission capacity due to the synergistic effect between Au and Ag. Thus, the ECL performance of GQDs could be greatly promoted by [email protected] core-shell nanoparticles. Under the optimal conditions, this proposed ECL sensor exhibited ultrahigh sensitivity for quantitative detection of HULC with a wide linear range from 1 fM to 5 nM and a low detection limit of 0.3 fM (S/N = 3). These results showed that the sensor was promising for the sensitive detection of lncRNA in clinical application.
研究领域:
生物学
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生物医学工程
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分析化学
·
癌症研究
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Meixian Li,Jun Liu,Tao Zhang,Nina Liang,Lijuan Yan,Fengzhen Lv,Wenjie Kong,Fuchi Liu,Lizhen Long
The construction of semiconductor heterojunctions is an effective approach to enhance the performance of optoelectronic devices. In this study, graphene-quantum-dots (GQDs) were grown on ZnO nanorods arrays in - situ to form intimate heterojunctions. The fabricated photoelectrochemical (PEC) photodetector based on ZnO/GQDs heterojunctions displayed good self-powering characteristics, with an on/off current ratio of approximately 21 at zero bias, which was almost seven-fold higher than that of the bare ZnO device. The responsivity and detectivity of the ZnO/GQDs-based photodetector were also enhanced compared with those of bare ZnO devices. A unique type-II band alignment was established at the ZnO/GQDs heterojunction interface, which facilitated the carrier transfer. Moreover, the ZnO/GQDs heterojunction reduced the passivation of the surface states, resulting in large energy-band bending and an internal electric field at the semiconductor/electrolyte interface, which provided a powerful driving force for the separation and transport of photogenerated carriers. These combined effects enhance the performance of the photodetector, indicating that this approach can be used to fabricate high-performance PEC optoelectronic devices.
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Progress & Sustainable Energy
·
2023
·Vol. 42
·期 6
·e14161
·
IF 2.8
Jie Cao,Fatao Zhang,Ting Xiao,Lihua Jiang,Weifeng Chen,Xinyu Tan
Utilizing the low-cost catalysts with excellent catalytic activities to replace the expensive ones for H 2 evolution still faces great challenges. It is significant to design the new catalysts with the synergistic effect to improve the activities and decrease the cost of the applications. Herein, the novel nanocatalyst of graphene quantum dots loaded bimetallic nanoparticles (Pt-Co/GQDs) has been synthesized for the H 2 evolution from hydrolysis of amine borane (AB) for the first time. The result indicates that the Pt-Co/GQDs nanocatalyst holds the better catalytic activities than Pt/GQDs, exhibiting the bimetallic synergies in the hydrolysis process. The synthesized catalyst has been characterized by various measurements, such as TEM, XPS, EDS, UV–Vis, and PL spectra. The effect of the catalyst on the hydrolysis of AB is investigated. It is demonstrated that the value of total turnover frequencies (TOFs) can arrive to 520 mol H 2 ·mol Pt −1 ·min −1 via the catalyst designing, which is very high in comparison with other reported catalysts. This work has developed an effective nanocatalyst with a lower cost which is never reported in the hydrolysis of AB, possessing both great significance and huge potential in the H 2 evolution by hydrolysis of the hydrogen storage materials.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuqing Lu,Chunsheng Ding,Jun Guo,Wei Gan,Peng Chen,Miao Zhang,Zhaoqi Sun
There is a high demand for photocatalysts that can efficiently degrade antibiotics; however, there are challenges in technological development related to charge transfer and light capture ability. In this study, ternary Bi 2 MoO 6 /GQDs/TiO 2 (denoted as BGT; GQDs refer to graphene quantum dots) heterojunction photocatalysts with high ciprofloxacin (CIP) photodegradation efficiency were successfully prepared. BGT with a 0.20 mL GQD dispersion solution (BGT-2) exhibited the highest CIP photodegradation efficiency (90.21 %). The rate constant of BGT-2 was 15.49 × 10 −3 min −1 , which was 4.01, 4.16, and 9.22 times higher than those of Bi 2 MoO 6 /TiO 2 (3.86 × 10 −3 min −1 ), Bi 2 MoO 6 (3.72 × 10 −3 min −1 ), and TiO 2 (1.68 × 10 −3 min −1 ), respectively. The degradation efficiencies of amoxicillin and tetracycline hydrochloride were 78.98 % and 92.49 %, respectively. The effects of pH values, water sources, and inorganic anions on CIP degradation were systematically explored. In addition, three environmentally friendly degradation pathways were proposed based on liquid chromatography-mass spectrometry (LC-MS) results and the toxicity evaluation of the various intermediates. Testing the optical and electrochemical properties of the catalysts showed that the synthesized dual Z-scheme heterojunctions can significantly improve the light capture ability and reduce the photogenerated electron-hole recombination rate, effectively addressing the challenges encountered with the use of photocatalysts.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhixin Jia,Jingbin Zhang,Zengtao Ji,Xinting Yang,Ce Shi,Xia Sun,Yemin Guo
To address the growing challenge of counterfeit prevention, this study developed a novel anti-counterfeiting ink system based on bacterial cellulose nanocrystals (BCNC) and lanthanide (Er, Yb)‑nitrogen (N) co-dropped graphene quantum dots (GQDs), which exhibited both photoluminescence (PL) and upconversion photoluminescence (UCPL) fluorescent properties as well as excellent rheological characteristics . The Er/Yb/N-GQDs with positive charges were synthesized by a one-step hydrothermal method and subsequently assembled with negatively charged BCNC through electrostatic self-assembly to fabricate a novel nanohybrid , Er/Yb/N-GQDs-BCNC. Raman spectroscopy results indicated an enhancement in the graphitization of GQDs due to lanthanide modification. The TEM results demonstrated a homogeneous distribution of Er/Yb/N-GQDs on BCNC, while XRD , FTIR, and XPS analyses confirmed their physical binding, thus validating the successful synthesis of novel nanohybrids. Then, Er/Yb/N-GQDs-BCNC was introduced into PVA waterborne ink and exhibited dual anti-counterfeiting properties by emitting blue fluorescence at Em 440 nm under Ex 370 nm and green fluorescence at Em 550 nm under Ex 980 nm. Furthermore, the incorporation of BCNC significantly enhanced the thixotropic behavior and yield stress of the PVA waterborne ink. This enhancement made the dual anti-counterfeiting fluorescent ink more suitable for diversified applications on different devices and various substrates, thus providing a novel approach for convenient and rapid information encryption and high security anti-counterfeiting.
研究领域:
材料科学
·
化学
·
纳米技术
·
光学
·
防伪技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 18
·3567-3576
·
IF 7.571
Zixia Wu,Tonghe Pan,Deqing Lin,Weibo Xia,Jia Shan,Rumei Cheng,Mei Yang,Xuting Hu,Kaihui Nan,Lei Qi
To deal with the complex tumor microenvironment (TME), chemodynamic therapy (CDT) has been developed, which uses nanocatalysts simulating peroxidase to convert high concentration hydrogen peroxide (H2O2) into highly toxic hydroxyl radicals (˙OH) in situ and effectively kills tumor cells. Due to the low catalytic activity of traditional nanocatalysts, the present CDT treatment has to be combined with other anti-tumor therapies, which increases the complexity and uncertainty of the treatment. Thus, developing new nanocatalysts with stable and high enzymatic activity is the key point to CDT treatment. Graphene quantum dots (GQDs) are important metal-free catalysts with intrinsic peroxidase-like activity due to their excellent electron transport performance. Here, we prepare a nitrogen-doped GQD (NGOD) nanocatalyst, which displays much higher peroxidase activity than known metal nanocatalysts. The NGQD nanocatalyst is further grafted with RGDS peptide-modified polyethylene glycol (PEG), which guides the nanocatalyst to the tumor area and increases its circulation time in blood. The as-produced RGDS-PEG@NG nanocatalyst displays stable and high peroxidase activity, which achieves the conversion of H2O2 → ˙OH in the TME. Through an in vivo study it has been observed that RGDS-PEG@NGs obviously inhibit tumor growth without combining with other treatment methods and show excellent biocompatibility, which provides a unique idea for the application of GQDs in CDT.
研究领域:
纳米技术
·
癌症治疗
·
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2020
·
IF 2.734
Jingjing Dong,Yan Zhang,Pengyue Guo,Huanghuang Xu,Yuan Wang,Dongzhi Yang
Photodynamic therapy (PDT) has received extensive attention in tumor treatment due to its advantages in overcoming drug resistance for chemotherapy. In this work, we prepared a nanoplatform generated from graphene quantum dots capped in hollow mesoporous silica nanoparticles (GQDs/hMSN). The singlet oxygen ( 1 O 2 ) generation efficiency and photodynamic therapy effect of GQDs/hMSN were studied in vitro and in vivo . GQDs/hMSN had good 1 O 2 generation yield in water. Based on the findings from cellular experiments, we concluded that doxorubicin (DOX) loaded GQDs/hMSN (GQDs/hMSN(DOX)) had synergistic chemo-photodynamic therapeutic effect. From in vivo therapy on HeLa tumor-bearing mice, GQDs/hMSN exhibited significant accumulation in the tumor site, where DOX was also released from the nanoplatform due to the unique tumor microenvironment . This work further confirmed the usefulness of GQDs/hMSN nanoplatform as a potentially useful vector for combinational therapy of cancer.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Congrong Yu,Xuan Guo,Xiangtao Gao,Zhongbo Yu,Jun Jiang
Graphene quantum dots (GQDs), a new type of carbon-based nanoparticles are widely used in scientific applications in the recent years. With the size less than 10 nm, and the strong hydrophilic characteristics GQDs exhibit high mobility in the environment, and can easily transmit to the groundwater environment. Hence, a good understanding of the transport behaviors of GQDs in porous media can provide guidance for assessment and prediction of its environmental risks. Saturated packed column experiments were conducted to investigate the effect of ionic strength (IS,1 and 100 mM), pH (4,7 and 9) and initial concentration (9 and 18 mg L −1 ) on the fate and transport of GQDs in saturated porous media. Advection-dispersion-reaction model with the second-order kinetics simulated the process well. The retention of GQDs was promoted with increased ionic strength in sand column, which could be explained with classic filtration and XDLVO theories. The increase of pH slightly reduced the GQDs deposition in saturated porous media, due to that there were no secondary minima in XDLVO calculation, and GQDs still showed high mobility. Higher input concentration slightly increased the GQDs retention due to the ripening process. The recovery rate of GQDs were more than 90 % in the environment with low salt content, exhibiting extremely high migration capacity.
研究领域:
环境科学
·
纳米技术
✓ 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）