Biomaterials Advances
·
2024
·
IF 5.5
Dongliang Huo,Ting Liu,Kangkang Huang,Changhui Que,Shuoyan Jiang,Yuxia Yang,Shaozao Tan,Langhuan Huang
Biofilm-mediated implant-associated infections are one of the most serious complications of implantation surgery, posing a grave threat to patient well-being. Effectively addressing bacterial infections is crucial for the success of implantation procedures. In this study, we prepared a bismuth sulfide silver@carbon quantum dot composite coating (AgBiS 2 @CQDs/Ti) on a medical titanium surface by surface engineering design to treat implant-associated infections. The photocatalytic/photothermal activity test results confirmed the excellent photogenerated ROS and photothermal properties of AgBiS 2 @CQDs/Ti under near-infrared laser irradiation. In vitro antibacterial and in vivo anti-infection experiments showed that the coating combined with photodynamic and photothermal therapies to eradicate bacteria and disrupt mature biofilms under 1064 nm laser irradiation. Consequently, AgBiS 2 @CQDs/Ti shows promise as an implant coating for treating implant-associated infections post-surgery, thereby enhancing the success rate of implantation procedures. This study also provides a new idea for combating implant-associated infections.
研究领域:
材料科学
·
生物材料
·
纳米技术
·
生物医学工程
·
传染病学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2022
·
IF 6.556
Xuemei Ma,Jiayi Yu,Lin Wei,Qian Zhao,Liyong Ren,Zhiyong Hu
Simultaneous selective determination of Fe (Ⅱ) and Fe (Ⅲ) is of great significance to the study of iron ion tracking and release of iron supplement in gastric fluid. In this paper, a composite material (N-CQDs/AgNPs/β-CD) was prepared by a one-pot method. The various characterizations confirmed the silver nanoparticles (AgNPs) grew in situ on the surface of nitrogen-doped carbon quantum dots (N-CQDs), and the β-cyclodextrin (β-CD) and AgNPs linked together by Ag–O bonds finally presented gourd-like nanoparticles on the surface of N-CQDs. Then, N-CQDs/AgNPs/β-CD modified glassy carbon electrode (GCE) was applied to detect Fe(II) and Fe(III) simultaneously. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results confirmed that N-CQDs/AgNPs/β-CD enhanced electrode performances because of the synergistic effect between N-CQDs, AgNPs and β-CD. The sensor was successfully applied for the determination by differential pulse voltammetry (DPV) of Fe(II) and Fe(III) released from four iron supplementations in simulated gastric fluid (SGF).
研究领域:
分析化学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zihan Tian,Yumei Xu,Qingyu Liu,Xiao Wu,Shuhao Qin,Jing Zhang,Hong Wang,Jianxin Li,Zhenyu Cui
The ridge-like PVDF/CQDs-TiO 2 @CQDs hybrid piezo-photocatalytic film was fabricated via an " in situ hydrothermal-vapor induction" method, in which the S-scheme TiO 2 @CQDs heterostructures were grown in situ and uniformly immobilization onto the polyvinylidene fluoride (PVDF) film surface through Ti-F coordination bonds. The effects of hybrid film morphology, carbon quantum dots (CQDs) doping, and flow rate on piezo-photocatalytic degradation performance were investigated. The ridge-like microstructure increased the exposure of adsorption and catalytic active sites. The film reactor driven by the flow of dye solution and light illumination promoted the adsorption of pollutants while establishing a dual built-in electric field (IEF) between the piezoelectric PVDF and catalysts, TiO 2 and CQDs, which accelerated photogenerated charge transfer and separation. Finally, a dynamic piezo-photocatalytic process was realized for the efficient and synergistic degradation of RhB. The reaction rate constant ( ks ) of the dynamic piezo-photocatalytic degradation was about 2.3 times that of the static photocatalytic process. Structural optimization and density functional theory (DFT) calculations of Rhodamine B (RhB) molecules were performed using Gaussian software. The degradation products, degradation pathways, and degradation mechanisms of RhB were thoroughly studied by combining the results of total organic carbon (TOC), DFT and liquid chromatography mass spectrometry (LC-MS).
研究领域:
材料科学
·
环境科学
·
光催化技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yan-nan Wang,Jingfeng Li,Zhiqiang Yang,Zhenyu Yuan,Jin Li,Fanli Meng
In this study, a hollow malposition structure (HMS) optical fiber 2-butanone gas sensor based on double-layer WO 3 @CQDs porous film is proposed, and realizes the ppb detection of 2-butanone gas at room temperature. The HMS can excite the evanescent field and sense the gas adsorption on the fiber surface. The experimental results show sensitivity of 3.09 pm/ppm for this HMS optical fiber gas sensor based on double-layered WO 3 @CQDs porous film, which is 6.05 times higher than that of the sensor coated with single-layer WO 3 @CQDs porous film. In addition, a limit of detection (LOD) reaches 500 ppb. The response time is 11.7 s and the recovery time is 5.72 s. Density functional theory (DFT) results show that the modification of CQDs improves the adsorption capacity of WO 3 @CQDs for 2-butanone gas molecules and changes the refractive index of the material. The sensor has the advantages of small volume, high sensitivity and a low LOD, which is of great significance for the detection of trace 2-butanone gas.
研究领域:
材料科学
·
光学传感
·
气体检测
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DOI
高影响因子
Solids
·
2025
·Vol. 6
·期 3
·49
·
IF 2.4
Xinyue Jing,Minxuan Chen,Xingye Ma,Xinrui Xu,Ning Wang,Kunpeng Niu,Xiaohan Chen,Yihao Wang,Jiayi Zhu,Jianguo Hou,Zhichao Wang
As a vital transition metal species, cobalt ions (Co2+) play a critical role in industrial and medical fields. However, uncontrolled release into ecosystems via industrial effluents presents significant environmental risks. To address this, a prism-coupled surface plasmon resonance (SPR) sensor chip was developed which enables simultaneous high sensitivity, wide detection range, and rapid detection of Co2+under ultra-low detection limit conditions. By depositing a 50 nm Au film and AuNPs on a glass substrate, and integrating carboxyl-functionalized carbon quantum dots (CQDs), the chip achieved the detection range of 10−20mol/L to 10−4mol/L, and the response time was reduced from 21 min to 11 min under optimal electric field conditions (1.2 V, 0.15 mol/L electrolyte concentration). The sensor exhibits high selectivity, repeatability, and stability. It can be integrated with optofluidic technology to enable high-throughput microfluidic analysis, thereby facilitating further advancements in related research.
研究领域:
环境监测
·
传感器与生物传感器
·
纳米材料
·
分析化学
·
光学传感
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 32
·1-16
·
IF 2.8
Guan Jiayan,Liu Xiangchun,Bai Ningna,Wang Fei,Yang Zhe,Zhang Jie,Gao Feng,Zhang Ping,Wei Ziyao
High-performance fluorescent carbon quantum dots (CQDs) prepared by hydrothermal method using citric acid and polyethyleneimine as raw materials. TiO 2 /ZnO/CQDs ternary composites were obtained by compositing different contents of CQDs with TiO 2 /ZnO. The phase structure, morphology, photocatalytic performance, and photocatalytic mechanism of ternary TiO 2 /ZnO/CQDs were investigated. The result shows that the CQDs synthesized by the hydrothermal method have good whole dispersibility, spherical shape, and particle size of 3–5 nm. When the hydrothermal time is 4 h and the hydrothermal temperature is 220 °C, the fluorescence luminescence performance of the prepared CQDs is the best. The prepared CQDs were loaded on the surface of TiO 2 /ZnO to form ternary TiO 2 /ZnO/CQDs photocatalysts. The results find that no other new phase is produced by the complex, and the TCZ-1 sample (When the amount of CQDs is 1 mL, the prepared ternary composite photocatalyst.) has a uniform grain size, with an average grain size of about 20 nm. CQDs can reduce the band gap bandwidth of TiO 2 /ZnO, and the polar hydrophilic functional groups of CQDs are displayed in the composite, which improves the photocatalytic performance and stability of TiO 2 /ZnO. TCZ-1 sample has the best photocatalytic performance, and the photocatalytic degradation rate of methylene blue (MB) solution is 96.7% within 90 min, and after 5 cycles of degradation, it drops to 80.2%, which is improved compared with zinc oxide catalyst.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tao Wei,Jialong Yin,Heng Zhang,Mengfan Luo,Jia Zhao,Junwei Liu,Bingkun Huang,Zelin Wu,Hongyu Zhou,Yang Liu,Chuanshu He,Bo Lai
Titanium dioxide (TiO 2 ) stands out as a promising semiconductor catalyst in photocatalysis, mainly due to its low cost and high photocatalytic activity. However, the photocatalytic efficiency of TiO 2 is limited by the fast rate of photogenerated electron-hole recombination. In this paper, carbon quantum dots (CQDs) are used to address the issue of electron-hole recombination in TiO 2 . SEM, TEM, XRD, and Raman spectroscopy confirmed that CQDs was successfully loaded onto LM-TiO 2 . Sulfamethoxazole (SMX) was selected as a simulated water pollutant under ultraviolet irradiation. Under ultraviolet irradiation, loaded CQDs onto layered mesoporous TiO 2 (CQDs@LM-TiO 2 ) exhibits superior activity in degrading SMX compared with pure LM-TiO 2 . Quenching, EPR and probe experiments showed that the dominant active species of UV/CQDs@LM-TiO 2 /PI system was single oxygen ( 1 O 2 ). The results of electrochemical characterization, FT-IR and XPS show that the CQDs on the surface of LM-TiO 2 is conducive to the transfer of electrons, thus activating PI to produce 1 O 2 and degrading pollutants. The cyclic and coexisting anion influence experiments show that the catalyst has excellent stability, and the UV/CQDs@LM-TiO 2 /PI system is resistant to co-existing substances in water. Owing to their unique electron transport capacity and wide light response interval, CQDs show great application potential in the field of photocatalysis.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhiquan Chen,Didi Yang,Zhenda Liang,Yongtao Xu,Yijun Pang,Gang Xu,Chaoxiang Chen,Kunyu Ma,Li Zhou,Bing Yan
Microbial pollution and antibiotic contamination can pose a serious threat to human health. The rational development of efficient and low-cost methods is critical to solving these problems. In this study, novel Z-scheme heterojunctions consisting of Yb-MnO 2 and nitrogen-doped carbon quantum dots (N-CQDs) were fabricated to achieve efficient photocatalytic degradation of tetracycline (TC) and the destruction of bacteria ( Escherichia coli used as a model). Results showed that the Yb-doping strategy improves the characteristics of host MnO 2 by weakening the lattice interface and increasing its surface area. Compared with Yb-MnO 2 , Yb-MnO 2 /N-CQDs heterostructures exhibited superior photocatalytic activity in TC degradation under simulated solar light. The remarkable photocatalytic and mild oxidation abilities of Yb-MnO 2 /N-CQDs led to an impressive 97.88% removal rate of TC. Additionally, the structure displayed robust resistance to various ions and broad pH levels. Notably, the Yb-MnO 2 /N-CQDs heterostructures exhibited excellent bactericidal activity, with no observed bacterial resistance even after 20 consecutive trials. Furthermore, quenching experiments demonstrated that 1 O 2 and O 2 − were the primary radicals involved in the Yb-MnO 2 /N-CQDs-based photocatalysis process. The remarkable photocatalytic activity of Yb-MnO 2 /N-CQDs can be attributed to two key factors. Firstly, the large surface area and abundant oxygen defects provide rich active sites for reactant degradation. Secondly, the Z-scheme heterojunctions formed between Yb-MnO 2 and N-CQDs effectively facilitate the separation of photogenerated electron-hole pairs and increase the reduction/oxidation potentials for reactive oxygen species generation. This study presents a promising novel photocatalyst for the facile and energy-saving treatment of antibiotic and microbial pollution, and it may provide new insight into the design of highly efficient heterogeneous photocatalysts.
研究领域:
环境科学
·
材料科学
·
微生物学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Jiehong Huang,Weizhen Chen,Xiang Yu,Xionghui Fu,Yi Zhu,Yuanming Zhang
In this work, a ternary BiOCl/carbon quantum dots (CQDs)/reduced graphene oxide (rGO) composite photocatalyst with high removal efficiency of ciprofloxacin was fabricated. For BiOCl/CQDs/rGO-10, rGO greatly enhanced the adsorption capacity, while rGO and CQDs significantly improved the photocatalytic performance by enhancing the charge separation and charge injection, which were 3.8 and 8.4 times higher than those of BiOCl, respectively. Interestingly, the photon absorption rate of BiOCl/CQDs/rGO-10 was only 1.3 times higher than that of BiOCl, suggesting that CQDs and rGO could not improve the effective light absorption although they could enhance the light harvesting ability and demonstrating the enhancement in light harvesting ability was not an essential factor for improving photocatalytic activity. In addition, BiOCl/CQDs/rGO-10 displayed high stability and the photocatalytic mechanism of ciprofloxacin was also proposed. This work not only exhibited an excellent reference with outstanding adsorption-photocatalytic performance in application of water remediation, but also provided a new insight into the roles of CQDs and rGO in the adsorption and photocatalysis for CQDs or rGO based composite photocatalysts.
研究领域:
环境科学
·
材料科学
·
水处理
·
光催化
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yan-nan Wang,Jin Li,Zhenyu Yuan,Fanli Meng
An optical fiber triethylamine (TEA) gas sensor based on a hollow malposition structure (HMS) platform with CQDs@BiOBr gas-sensing layer is proposed. The CQDs@BiOBr gas-sensing material is coated onto the surface of the hollow core fiber (HCF) using a dip-coating method. The misaligned structure is designed to guide light transmission within the cladding of the HCF and excite the evanescent field. The heterojunction formed between CQDs and BiOBr enhances the separation efficiency of electron-hole pairs, improving the transfer speed of charge carriers during the gas adsorption process. Experimental results show that the sensitivity of sensor at room temperature is 3.53 pm/ppm, which is 2.43 times higher compared to a sensor coated with BiOBr alone. Additionally, the response and recovery times of sensor are 12 s and 36 s, respectively, with a limit of detection (LOD) of 5.67 ppm. DFT calculations provide insight into the electronic transfer pathways and electron cloud distribution during the gas adsorption process, further validating the crucial role of the CQDs@BiOBr heterojunction in enhancing gas-sensing performance. The proposed optical fiber TEA gas sensor shows significant potential for applications in environmental monitoring and industrial safety.
研究领域:
光学工程
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhirou Xu,Zhengtong Wu,Xuyang Sun
An ultrasensitive fluorescence immunosensor based on silver nanoparticles@ nitrogen-doped carbon quantum dots (Ag NPs@N/CQDs) and exploiting the quenching effect of gold nanoparticles (Au NPs) was fabricated for squamous cell carcinoma antigen (SCCA) detection. Ag NPs@N/CQDs were immobilized on the surface of an indium tin oxide (ITO) electrode and then coupled with the primary antibody of SCCA. The primary antibody captured SCCA on the ITO electrode, forming an immune complex with the secondary antibody labeled with gold nanoparticles, thereby constructing a sandwich-structured fluorescent sensor. Using the prepared sensor, a new method for detecting trace amounts of SCCA in human serum was established. Owing to the effective quenching of fluorescence intensity of Ag NPs@N/CQDs by Au NPs, combined with the presence of a sandwich immune structure, the sensor exhibits high sensitivity and selectivity. The method demonstrates a linear range of 2 − 4000 fg mL −1 and a detection limit of 0.87 fg mL −1 . The the recovery rate for real serum samples was between 94.45 % to 103.43 %.
研究领域:
生物医学工程
·
肿瘤学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Yang Wang,Xiaoqing He,Peng Gao,Li Feng,Liqiu Zhang
Limited utilization of photogenerated charge carriers in titanium dioxide under visible light have hinder its application development. To address this challenge, a novel N-doped carbon quantum dots (N-CQDs) and oxygen vacancies (OVs) synergistically decorated on TiO 2 (P25) was synthesized through a facile one-step hydrothermal method. Under visible light irradiation, the first order reaction rate constants of formaldehyde (HCHO) photocatalytic oxidation by OVs-TiO 2 and N-CQDs/OVs-TiO 2 was significantly higher than that of pristine P25, with 10.1 and 16.7 folds increase, respectively. Characterization results confirmed the generation of OVs on the surface of N-CQDs/TiO 2 composite. The optical and electrochemical experiments suggested the electron capture center effect of OVs and the properties of N-CQDs in unique up-converted photoluminescence , efficient charge separation, as well as significant adsorption in visible light region. In addition, the work function also clarified that photoelectrons could transfer from N-CQDs to OVs-TiO 2 . Furthermore, different relative humidity and electron paramagnetic resonance (EPR) experiments demonstrated that the hydroxyl radical (•OH) was the dominant reactive radical in HCHO photodegradation . The •O 2 − could also enhance the photodegradation efficiency of HCHO. This work provides an in-depth understanding on the complementary roles of N-CQDs and OVs and is helpful for designing metallic oxide photocatalysts for volatile organic compounds removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）