Journal of Physical Chemistry C
·
2025
·
IF 3.2
Wei Zeng,Sili luo,Da Rong,Yanlong Li,Yunying Fei,Meng Zhao,Linsheng Huang
A highly sensitive electrochemical sensor based on a composite of two-dimensional (2D) reduced graphene oxide (rGO) and three-dimensional (3D) zeolitic imidazolate framework-8 (ZIF-8) for detecting the NH4+ ion is reported. The ZIF-8/rGO composite electrode is in situ grown to be anchored on the Si/Ag substrate. Here, the rGO layer has high conductivity, while ZIF-8 has a large specific surface area, which provides a large number of active sites. This structure significantly increases the electrical conductivity and enhances the electrochemical performance. With a differential pulse voltammetry measurement at the pH value of 7.00, the multidimensional composite electrode with the optimal ZIF-8 structure exhibits a sensitivity of 9.30 μA μM–1, and a detection range of 5–50 μM with a low detection limit of 3.00 × 10–9 M, as well as high repeatability, stability, and selectivity. These results might be due to the oxidation reaction of NH4+ with the ZIF-8 framework and the special 2D–3D electron transfer channel formed by the composite.
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Water
·
2024
·Vol. 16
·期 14
·2026
·
IF 3
Yang Gu,Chengjun Qiu,Wei Qu,Wei Tao,Zizi Zhao,Huili Hao
Cadmium (Cd) and zinc (Zn) in seawater enter the human body through the food chain. Combined toxicity tests indicated that high concentrations of Cd(II) and low concentrations of Zn(II) had a synergistic effect on humans. Thus, there is an urgent need to prepare a sensor for rapid and simultaneous detection of Cd(II) and Zn(II) in seawater. Herein, a reduced graphene oxide/carboxylated multi-walled carbon nanotube (rGO/MWCNT-COOH)-modified glassy carbon electrode was prepared in the experiments using the dropping method. The synthesis of various materials achieved the purpose of expanding the surface area, and scanning electron microscopy was used to observe the structure of the composite membrane. Moreover, the large number of functional groups on the surface of the composite membrane can also increase the adsorption of ions. For the determination of trace cadmium (II) and zinc (II) in seawater, the method used was differential pulse voltammetry (DPV). The results show that the peak current, which was obtained in the range of 5–400 μg/L for Cd(II) and Zn(II), has a linear relationship with concentration, corresponding to the detection limits of 0.8 μg/L for Cd(II) and 0.98 μg/L for Zn(II). The modified electrode was used to determine the Cd(II) and Zn(II) content in the coastal seawater of the Maowei Sea, and the recovery rate was between 95.8 and 98.2% for Cd(II) and 96.7~99.4% for Zn(II), which provided a novel approach of detection to define trace Cd(II) and Zn(II) in seawater.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6269
·
IF 3.1
Mirza Nadeem Ahmad,Muhammad Naveed Anjum,Muhammad Fayyaz Farid,Atta-ul Haq,Akbar Ali,Muhammad Fayyazur Rehman,Mohammed A. Assiri,Muhammad Safwan Akram
Water pollution is growing at an alarming rate, particularly due to the colored wastewater released by the various industries into aquifers and fresh water sources, and in some extreme cases, they have reached the water table. Faisalabad, a city in Pakistan where there is an industrial cluster of textiles dyeing and manufacturers, water table has become undrinkable. The presence of hazardous dyes and chemicals imposes serious health issues on humans, animals, and plants. The treatment of such toxic dye effluents is crucial and could be done by efficient degradation methods such as photocatalysis. The current study presents synthesis of poly( o -methylaniline)/zinc oxide/reduced graphene oxide nanocomposite (POMA/ZnO/rGO NC) using a chemical oxidative polymerization process and explores its properties as a photocatalyst by demonstrating degradation of three dyes. The composite was characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), photoluminescence emission spectroscopy (PL), Brunauer Emmett–Teller analysis (BET), and UV–visible spectroscopy (UV–visible). Further, the photocatalytic activity of POMA/ZnO/rGO NC was evaluated and compared by degrading the direct yellow 12 (DY 12), congo red (CR), and malachite green (MG) dyes in aqueous media under UV irradiation. The results indicated that after 110 min, POMA/ZnO/rGO composite degraded the dyes by 92% (DY 12), 86.1% (CR), and 82.1% (MG), respectively. Moreover, kinetic studies of the photocatalyst were also performed along with reusability test, total organic carbon, chemical oxygen demand, and degradation mechanism.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wen-Bei Yu,Heng-Rui Zhang,Hong-Wei Zhang,Yao Liu,Yu Li,Bao-Lian Su
Carbon materials are commonly integrated with TiO 2 to achieve high carrier mobility and excellent photocatalytic performance, and the chemical bond between TiO 2 − C is considered as a significant strategy to enhance efficiency. Nevertheless, few analyses have elucidated the formation mechanism of Ti 3 + − C bonds and the underlying reasons for the performance enhancement. To address these issues, this study conducts an in-depth investigation into the electronic structure of TiO 2 − C and demonstrates that the charge in the nonbonding molecular orbital t 2 g of Ti 3 + is transferred to the unoccupied 2 p energy level of C through the formation of 1π and 2π bonds, i.e., (Ti 3 d xz - C 2 p y ) and (Ti 3 d xy - C 2 p x ). The hybridization of t 2 g -2 p orbitals endows the Ti 3 + − C bond with higher carrier mobility and a stronger binding force, thereby contributing to stable photocatalytic H 2 production. Inspired by this scenario, the NSTiO 2 /rGO hybrid architecture, featuring the {101}/{001} surface heterojunction and the Ti 3 + − C interfacial chemical bond, has been constructed. As a result, the hybrid catalyst exhibited excellent photocatalytic cycling stability of 92.9 % $92.9 \,\%$ and an H 2 evolution rate of 33.4 mmolh −1 g −1 . This work proposes a strategy for designing efficient photocatalyst by regulating orbitals to achieve high-performance photocatalytic methanol splitting.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Fuxin Liu,Wenyan Li,Fang Nian,Haitao Long,Lumei Pu,Xiuhui Liu
Homocysteine (Hcy) is a key biomarker for various diseases, and its precise detection is essential for early clinical diagnosis. Herein, an innovative ratiometric electrochemical aptasensor was constructed to overcome the limitations in sensitivity, selectivity, and stability in conventional Hcy detection methods. Firstly, we synthesized a novel 3D MXene/rGO aerogel loaded AuNPs composite (Au/MGA-40) with outstanding specific surface area and remarkable electrical conductivity. Next, the Hcy aptamer was self-assembled to the Au/MGA-40/MB modified electrode surface by gold sulfur bonds (Au-S). Finally, a ratiometric detection mode was established based on the linear relationship between the oxidation peak current ratios (I Hcy /I MB ) and the Hcy concentrations. The aptasensor exhibited excellent analytical behavior for Hcy, with a ultrawide detection range from 2.14 nM to 200 μM and a detection limit as low as 0.835 nM. It also displayed remarkable selectivity due to the specific recognition between Hcy and the aptamer, enabling discrimination of Hcy from structurally similar molecules such as cysteine (Cys), glutathione (GSH) and methionine (Met). The ratio signal mode demonstrated superior long-term stability performance compared to conventional single signal sensors. As evidenced by the successful detection of Hcy in human serum, which underscores its potential for early screening of Hcy-related diseases.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Fang Wang,Jiajun Wang,Wen Li,Yimao Wu,Jiaqi Liu
Smart hydrogel materials demonstrated promising application prospects in flexible electronic devices, human-machine interaction systems, and soft robotics owing to their exceptional electrical conductivity. However, significant technical challenges remained to be addressed for developing multifunctional hydrogel systems integrating both sensing and actuation capabilities. In this study, polydopamine (PDA) was employed to conduct in-situ reduction of graphene oxide (GO) under alkaline conditions, yielding reduced graphene oxide (rGO) with superior electrical conductivity and high photothermal conversion efficiency. The resulting nanomaterial was subsequently combined with natural polysaccharide starch to fabricate a poly (acrylic acid-2-hydroxyethyl methacrylate)/starch/reduced graphene oxide (P(AA-HEMA)/St/rGO) hydrogel composite. This hydrogel system exhibited not only exceptional mechanical properties (176 kPa tensile stress and 1258 % strain) and durability, but also demonstrated high conductivity (3.64 S/m) and sensitive sensing characteristics (achieving a gauge factor of 5.15 at 1300 % strain). The developed hydrogel sensor accurately detected various physiological signals including fist clenching, pulse vibration, and vocalization. Furthermore, by leveraging its excellent photothermal response properties, a three-dimensional array sensor configuration was established, enabling real-time monitoring of ambient temperature variations. Through ingenious material design and structural optimization, this research successfully developed a multifunctional smart hydrogel, providing a novel material solution for biomedical applications and flexible electronic devices.
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PubMed
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 31
·2342
·
IF 3.2
Ye Xingke,Yan Ning,Fuyao Huimei,Deng Qi,Sun Congcong,Qin Renchi,Ma Shihan,Li Yuxing,Yao Zhuheng,Qi Qing,Meng Fanbin
Developing multifunctional materials with integrated microwave absorption and corrosion resistance is crucial for expanding the practical application scope of functional materials in complex marine environments. In this work, a series of multiscale zero-dimensional/two-dimensional (0D/2D) heterostructure composites (denoted as MG@E) were successfully fabricated via a facile in-situ hydrothermal method. In this structural design, zero-dimensional europium-based metal–organic framework (EuMOF) microspheres are uniformly anchored on two-dimensional modified reduced graphene oxide (M/rGO) nanosheets, which effectively optimizes the impedance matching characteristic and improves the electromagnetic wave attenuation capacity of the composites. The excellent microwave absorption performance of MG@E composites originates from the synergistic effects of multiple loss mechanisms, including interfacial polarization at 0D/2D heterointerfaces, dipole polarization of MOF ligands, conductive loss, and magnetic dissipation. The optimized MG@E3 sample delivers a minimum reflection loss (RL) of −54.02 dB at a matching thickness of 2.1 mm, and a maximum effective absorption bandwidth (EAB) of 4.5 GHz at a thin thickness of 1.4 mm. Furthermore, the electrochemical test results demonstrate that MG@E composite coatings can significantly improve the corrosion resistance of Q235 steel. Specifically, the MG@E2 sample achieves a corrosion protection efficiency of 94.8% even after 21 days of immersion in 3.5 wt% NaCl solution. The improved anti-corrosion performance is mainly attributed to the synergistic barrier effect derived from the 0D EuMOF microspheres embedded in the 2D labyrinth-like structure of M/rGO, which inhibits the penetration of corrosive media. It is worth noting that the comprehensive performance of the composites is still restricted by material dosage and preparation conditions to a certain extent. This work provides a feasible and referential strategy for the rational design and preparation of high-performance microwave absorption materials with improved marine environmental adaptability and long-term service potential.
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Nanoscale
·
2015
·Vol. 8
·期 4
·1897-1904
·
IF 7.394
Weibo Guo,Shu Wang,Xin Yu,Jichuan Qiu,Jianhua Li,Wei Tang,Zhou Li,Xiaoning Mou,Hong Liu,Zhonglin Wang
The cell–material interface is one of the most important considerations in designing a high-performance tissue engineering scaffold because the surface of the scaffold can determine the fate of stem cells. A conductive surface is required for a scaffold to direct stem cells toward neural differentiation. However, most conductive polymers are toxic and not amenable to biological degradation, which restricts the design of neural tissue engineering scaffolds. In this study, we used a bioactive three-dimensional (3D) porcine acellular dermal matrix (PADM), which is mainly composed of type I collagen, as a basic material and successfully assembled a layer of reduced graphene oxide (rGO) nanosheets on the surface of the PADM channels to obtain a porous 3D, biodegradable, conductive and biocompatible PADM–rGO hybrid neural tissue engineering scaffold. Compared with the PADM scaffold, assembling the rGO into the scaffold did not induce a significant change in the microstructure but endowed the PADM–rGO hybrid scaffold with good conductivity. A comparison of the neural differentiation of rat bone-marrow-derived mesenchymal stem cells (MSCs) was performed by culturing the MSCs on PADM and PADM–rGO scaffolds in neuronal culture medium, followed by the determination of gene expression and immunofluorescence staining. The results of both the gene expression and protein level assessments suggest that the rGO-assembled PADM scaffold may promote the differentiation of MSCs into neuronal cells with higher protein and gene expression levels after 7 days under neural differentiation conditions. This study demonstrated that the PADM–rGO hybrid scaffold is a promising scaffold for neural tissue engineering; this scaffold can not only support the growth of MSCs at a high proliferation rate but also enhance the differentiation of MSCs into neural cells.
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TALANTA
·
2020
·
IF 5.339
Bo Yin,Rui Rui Liu,Hong Lin Zhai,Shao Hua Lu,Jia Ying Mi
A simple and facile one-pot approach for the synthesis of copper nanoclusters decorated reduced graphene oxide (CuNCs/RGO) nanocomposite was proposed, in which the CuNCs attached to the surface of the reduced glutathione (GSH) functionalized RGO through ligand exchange via their thiol functionalities. The synthesized nanocomposite was verified by structural characterizations, and the further investigation of density functional theory (DFT) indicated that Cu 3 R 2 cluster (R = C 10 H 16 O 6 N 3 S) with the lowest energy was the most stable structure in GSH-capped CuNCs. Although the CuNCs/RGO nanocomposite exhibited rather weak fluorescence, with the addition of heparin (Hep), the significant enhancement of fluorescence at 595 nm was achieved, which was developed to detect Hep in human serum samples with high selectivity and sensitivity. The mechanisms of fluorescence quenching of CuNCs/RGO nanocomposite and the sensing of Hep were discussed. The linear range was 0.1–10 μM with the detection limit of 26 nM in buffer solution containing 2% human serum sample, and satisfactory recovery in the range of 96.6%–104% was obtained, suggesting that the proposed method could applied to the detection of Hep in human serum samples.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2020
·
IF 2.904
Ying Lu,Hui Sun,Jinyu Cheng,Jokwang Myong,Hasan Md Mehedi,Gajanan Bhat,Bin Yu
Flexible strain sensors have attracted wide attention to the field of applications on wearable electronic devices. However, they still have numerous defects, such as low linearity and low sensitivity. In this paper, high-elastic polybutylene terephthalate (PBT) melt-blown non-woven fabric (MB) was chosen as the substrate of the strain sensor. The reduced graphene oxide (rGO) and silver nanowires (AgNWs) were loaded on the PBT MB surface by simple ultrasonic treatments to form a dense and stable conductive path. The sensing properties of the sensors loaded with the different concentration load ratios of rGO and AgNWs were studied and the best load ratio was 1:0.9. The results showed that the sensor has excellent sensing characteristics, including wide range of applications (90 %), extremely high sensitivity (guage factor (GF) up to 1829 at 80 % strain). Finally, the strain sensor has demonstrated in monitoring an assortment of human-exercises even some subtle physiological signals.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lizhe Ma,Jieli Duan,Bang Ji,Yunfeng Liu,Chengjie Li,Can Li,Wenfeng Zhao,Zhou Yang
Overuse of antibiotics threatens water security, and photocatalysis is a potential technology to alleviate this problem. In this study, the TiO 2 /Bi 2 WO 6 /rGO nanocomposite materials were prepared by a solvothermal process, and a series of characterizations were carefully examined. Then, the removal of norfloxacin from water under visible light irradiation was investigated to evaluate the photocatalytic activity of TiO 2 /Bi 2 WO 6 /rGO. The TiO 2 /Bi 2 WO 6 /rGO composite catalyst has higher photocatalytic activity than TiO 2 and TiO 2 /Bi 2 WO 6 under visible light, and the optimal addition content for rGO is 0.5%. After 60 min of visible light irradiation, the degradation rate of norfloxacin on TiO 2 /Bi 2 WO 6 /rGO-0.5% reached 87.79%. Furthermore, the UV–Vis of the complex suggests that the ligand-metal electron transfer mechanism enhances the catalytic activity of TiO 2 /Bi 2 WO 6 /rGO. Finally, the mechanism of photocatalytic degradation of norfloxacin by TiO 2 /Bi 2 WO 6 /rGO composite catalyst was proposed.
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Biosensors-Basel
·
2022
·Vol. 12
·期 6
·367
·
IF 5.743
Rui-Hong Ye,Jin-Yang Chen,Di-Hui Huang,Yan-Jun Wang,Sheng Chen
The electronic conductive metal-organic frameworks (EC-MOFs) based on a single ligand are not suitable for the accurate detection of bisphenol A (BPA) due to the limitations of their electron-transfer-based sensing mechanism. To overcome this drawback, we developed EC-MOFs with novel dual-ligands, 2,3,6,7,10,11-hexahydroxy-sanya-phenyl (HHTP) and tetrahydroxy 1,4-quinone (THQ), and metal ions. A new class of 2D π-conjugation-based EC-MOFs (M-(HHTP)(THQ)) was synthesized by a self-assemble technique. Its best member (Cu-(HHTP)(THQ)) was selected and combined with reduced graphene (rGO) to form a Cu-(HHTP)(THQ)@rGO composite, which was thoroughly characterized by X-ray diffraction, field scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Cu-(HHTP)(THQ)@rGO was drop-cast onto a glassy carbon electrode (GCE) to obtain a sensor for BPA detection. Cyclic voltammetry and electrochemical impedance tests were used to evaluate the electrode performance. The oxidation current of BPA on the Cu-(HHTP)(THQ)@rGO/GCE was substantially higher than on unmodified GCE, which could be explained by a synergy between Cu-(HHTP)(THQ) (which provided sensing and adsorption) and rGO (which provided fast electron conductivity and high surface area). Cu-(HHTP)(THQ)@rGO/GCE exhibited a linear detection range for 0.05–100 μmol·L−1of BPA with 3.6 nmol·L−1(S/N = 3) detection limit. We believe that our novel electrode and BPA sensing method extends the application perspectives of EC-MOFs in the electrocatalysis and sensing fields.
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