ADVANCED ENGINEERING MATERIALS
·
2023
·
IF 3.6
Kai Shi,Guangming Zhang,Zhifeng Han,Lingxuan Ma,Jiaqi Hou,Daosen Song,Zhiguo Fu,Wei Zhou,Chenxu Guo,Huifa Shi,Xiaoyang Zhu,Hongbo Lan
Due to their outstanding electrical conductivity, simplicity of synthesis, and exceptional flexibility, conductive polymers are the most attractive electrode materials for micro-supercapacitors (MSCs). However, when used as an electrode material alone, its poor capacitive performance and cycle-life hinder the wide engineering applications. Herein, a polypyrrole (PPy)/Ag-interdigitated electrodes MSCs is proposed, and the impact of aromatic sulfonic acid group anion modification on the electrochemical properties and flexibility of PPy/Ag MSCs is investigated. In the results, it is shown that different aromatic sulfonic-acid-based anionic dopants have different effects on the properties of PPy films. Among the prepared three PPy/Ag MSCs devices, PPy:anthraquinone-2-sulfonic acid/Ag MSCs have the highest areal capacitance (198.8 mF cm −2 ) at a current density of 0.5 mA cm −2 , surpassing PPy:2-naphthalenesulfonic acid/Ag MSCs (114.3 mF cm −2 ) and PPy:p-toluenesulfonic acid monohydrate/Ag MSCs (89.7 mF cm −2 ). Furthermore, at a power density of 0.25 mW cm −2 , the PPy:AQS/Ag MSCs exhibit a high energy density of 27.61 μWh cm −2 , which is above the most of the previously reported PPy-based MSCs. Therefore, in this research, the groundwork is provided for improving properties of flexible MSCs based on PPy.
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Lubricants
·
2023
·Vol. 11
·期 10
·443
·
IF 3.5
Shaokun Jia,Jiahuan Zhao,Guangzhen Hao,Jifeng Feng,Chuanbo Zhang,Zhihui Wang,Zhengfeng Jia,Yungang Bai
In this study, nitrogen-doped carbon nanotube/Ag nanocomposites (denoted as N-C/Ag) have been synthesized in a urea solution using a hydrothermal method. The carbon nanotubes, AgNO3solution, urea and poly-dopamine (PDA) served as carbon, silver, nitrogen and carbon sources, respectively. The results show that the diameter of the carbon tubes was about 30 nm, and the Ag nanoparticles, with a diameter of ca. 10 nm, dispersed on the carbon tube surface. The Ag particle size decreased with a lower degree of crystallinity at a high temperature in the presence of urea. The friction and wear behavior of the oil acid (OA) modified N-C/Ag (OAN-C/Ag) as an additive in liquid paraffin (LP) were studied using a four-ball friction and wear tester. The results have shown that the coefficients of friction (COFs) and wear scar diameters (WSDs) of steel balls lubricated with LP-OAN-C/Ag decreased by 27.3% and 25.3%, respectively, relative to pure LP. Tribofilms containing Ag, carbon and nitride were formed on the worn steel ball surfaces. Details, the carbon, Fe2O3, azides and nitride, Ag and alloy and other compounds on the wear scars may improve tribological properties. The synergistic effect of carbon, Ag and urea plays a critical role during sliding.Keywords:N-doped carbon nanotube/Ag nanocomposites;polydopamine;hydrothermal;wear;friction
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiangyu Meng,Yuening Wang,Xiaoyu Song,Mingjian Zhang,Jian Yu,Lin Qiu,Jie Lin,Xiaotian Wang
Volatile organic compounds (VOCs) are common environmental pollutants and important biomarkers for early diagnosis of lung cancer. However, aldehydes are difficult to detect directly due to their small Raman scattering cross-section and gaseous phase. Here, a Ag-coated ternary layered double hydroxide (LDH) was designed for the detection and identification of various aldehydes. The specific surface area of CoNi-LDH was increased by doping Fe3+, which provides abundant active sites to capture gas molecules. Furthermore, the energy band gap (Eg) was decreased due to the local amorphous FeCoNi-LDH with an extended band tail, promoting the excitonic transition of Fe0.07(CoNi)0.93-LDH. In addition, the Fermi level of Ag prevented the recombination of electron–hole pairs of Fe0.07(CoNi)0.93-LDH, providing a new bridge for charge transfer between the substrate and the molecule. Ag/Fe0.07(CoNi)0.93-LDH presented excellent surface-enhanced Raman scattering (SERS) performance for aldehyde VOCs by modification with 4-aminothiophenol (4-ATP) to capture aldehydes and realized the detection of benzaldehyde (BZA) at 10 ppb. The enhancement and Raman shift of the b2 mode indicated the contribution of chemical enhancement to the SERS system, so the substrate presented good uniformity. The recycling of the SERS substrate is realized based on the reversibility of the Schiff base reaction. These results manifested that Ag/FeCoNi-LDH has a wide prospect in the application in the trace detection of aldehydes.
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PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 18
·2608
·
IF 5.3
Xiaoai Ye,Xu Zhang,Xinsheng Zhou,Guigen Wang
Lightweight, flexible, and electrically conductive thin films with high electromagnetic interference (EMI) shielding effectiveness and excellent thermal management capability are ideal for portable and flexible electronic devices. Herein, the asymmetric and multilayered structure Ag-MXene/ANFs composite papers (AMAGM) were fabricated based on Ag-MXene hybrids and aramid nanofibers (ANFs) via a self-reduction and alternating vacuum-assisted filtration process. The resultant AMAGM composite papers exhibit high electrical conductivity of 248,120 S m−1, excellent mechanical properties with tensile strength of 124.21 MPa and fracture strain of 4.98%, superior EMI shielding effectiveness (62 dB), ultra-high EMI SE/t (11,923 dB cm2g−1) and outstanding EMI SE reliability as high as 96.1% even after 5000 cycles of bending deformation benefiting from the unique structure and the 3D network at a thickness of 34 μm. Asymmetric structures play an important role in regulating reflection and absorption of electromagnetic waves. In addition, the multifunctional nanocomposite papers reveal outstanding thermal management performances such as ultrafast thermal response, high heating temperatures at low operation voltage, and high heating stability. The results indicate that the AMAGM composite papers have excellent potential for high-integration electromagnetic shielding, wearable electronics, artificial intelligence, and high-performance heating devices.Keywords:Ag-MXene/ANFs nanocomposite papers;asymmetric structure;EMI shielding;Joule heating performance
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高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Huiling Zhu,Cuixia Hao,Xin Li,Yao Qi,Xuesong Zhu,Yucheng Miao,Rui Liu,Jianxu Ding
Black phase CsPbI3 quantum dots (QDs) have garnered significant research interest due to their remarkable properties in optoelectronic applications. However, their inherent instability and low phase stability often lead to an undesired transformation into an orthorhombic yellow phase. In this study, we propose an innovative approach to synthesize Ag+ doped CsPbI3 QDs in a nonvacuum environment. The theoretical calculations and experimental results demonstrate that Ag+ doping substantially increases the formation energy and Goldschmidt tolerance factor, resulting in an enhanced thermodynamic stability and photoluminescence quantum yield (PLQY). The resulting Ag+ doped CsPbI3 QDs exhibit an impressive PLQY of up to 97% and maintain their black phase for over 60 days. This novel nonvacuum synthesis approach holds great potential for producing high-quality all-inorganic perovskite CsPbX3 QDs. To demonstrate the practical applications, we fabricate a white light-emitting diode (WLED) using the Ag+ doped CsPbI3 QDs, achieving Commission Internationale de I’Eclairage (CIE) color coordinates of (0.36, 0.26). These findings highlight the broad prospects of CsPbI3 QDs in lighting and display technologies.
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ChemistrySelect
·
2023
·Vol. 8
·期 34
·e202302723
·
IF 2.1
Jingnan Liu,Haoran Jia,Jiawei Guo,Wen Zhang
Graphical Cu 2 O−Ag nanocomposites were prepared and can be used with facile method for the electrochemical quantification of catechol. The rational surface configuration of Cu 2 O−Ag showed synergistic effects that improved the adsorption of catechol, facilitating interfacial electron transfer. Highly sensitive and selective electrochemical sensors are essential for human health, especially for monitoring the state of environmental pollutant content. Here, Cu 2 O nanocubes uniformly decorated with Ag nanoparticles were synthesized by a tractable wet-chemical method. The electrochemical studies confirm that the Cu 2 O-Ag-16 composite shows increased electrochemical activity for catechol determination compared with either the bare Cu 2 O or the other two as-proposed Cu 2 O−Ag catalysts (Cu 2 O−Ag-8, Cu 2 O−Ag-24). More specifically, the Cu 2 O−Ag-16 presents excellent electrochemical responses towards catechol detection over wide linear ranges of 0.05 μM – 1 mM and 1 mM – 5 mM, with high sensitivity and low detection limits (50 nM). Furthermore, the as-proposed sensor also displays good reproducibility, with a relative standard deviation of 2.3 % (n=3). Satisfactory recoveries in the range of 98.3 % to 101.2 % or 98 % to 100.7 % for lake water and/or tap water indicate the reliability of the sensor for catechol detection in practical applications. Constructing such composite structures to manipulate the local charge distribution for outstanding electrochemical sensing properties would provide us with an innovative strategy to explore other highly efficient electrode materials.
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Analytical Methods
·
2016
·Vol. 9
·期 1
·163-169
·
IF 1.915
Qinglin Sheng,Yu Shen,Jian Zhang,Jianbin Zheng
In this work, attractive core–shell structured nanomaterials consisting of Ni doped Ag@C were synthesized. Further, a hydrogen peroxide (H2O2) sensor was fabricated by modifying the Ni doped Ag@C (Ni/Ag@C) nanocomposites onto the surface of a glassy carbon electrode (GCE). The composition and morphology of the Ni/Ag@C nanocomposites were characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. The results indicated that the nanocomposites were synthesized successfully and showed similar grain sizes and favorable dispersity. The electrochemical and electrocatalytic properties of the Ni/Ag@C nanocomposites were studied by cyclic voltammetry. An electrochemical investigation showed that the Ni/Ag@C nanocomposite modified GCE exhibited a good electrocatalytic ability for H2O2 reduction and it was used for the determination of H2O2. The linear range for H2O2 determination was from 0.03 mM to 17.0 mM with a detection limit of 0.01 mM (S/N = 3). The sensitivity was 22.94 μA mM−1 cm−2. It is expected that the application of the Ni/Ag@C nanocomposites could be extended to the construction of other sensors and applications in various sensing fields.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 3.978
Jingjing Zhang,Feng Qu,Taobo Liang,Sidi Lv,Wen Li,Qixiu You,Bolu Chen,Hengyi Xu
Pseudomonas aeruginosa is one of the most commonly isolated nosocomial pathogens and is responsible for approximately 10 % of all hospital-acquired infections. P. aeruginosa is difficult to treat with known antibiotics due to its increasing antibiotic resistance. In our study, Ag NPs coated with ε-polylysine (ε-PL) and polyethyleneimine (PEI) were synthesized. These materials showed strong anti- P. aeruginosa capacity at an low concentration (IC50: 7.284 μg/mL). In addition, three drug-resistant clinical strains and biofilm formation were inhibited by ε-PL/PEI-coated Ag NPs (MBIC: 15.63 μg/mL). We further studied the antibacterial mechanism of Ag NPs on different levels and found that a) the amount of reactive oxygen species (ROS) increased, b) the expression of oxidative stress-related genes were up-regulated, c) the activity of total superoxide dismutase decreased, and d) the inhibitory rate is increased on P. aeruginosa cells. These antibacterial effects were dependent on an increasing concentration of Ag NPs but were neutralized by the ROS scavenger N-acetyl-L-cysteine. Therefore, we suggested that oxidative stress induced by ROS is the primary antibacterial mechanism of synthesized Ag NPs.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Jiye Qiu,Xiangwei Wang,Yong Ma,Zhiwei Yu,Tingxi Li
Stretchable transparent conductive films (STCFs) show great potential for application in flexible electronics. Herein, a facile and scalable method to prepare STCFs based on Ag nanowires (AgNWs) for flexible circuits and tension sensors is introduced for the first time. AgNWs were embedded in a substrate, and its bonding property with the substrate was tested using 3M Scotch tape. The transmittance of STCFs with a sheet resistance of 20 Ω/sq was found to be more than 85% at a wavelength of 550 nm. The STCFs with less than 20 Ω/sq almost stayed constant even after twisting and bending for 10,000 cycles and stretching for 1000 cycles, respectively. Then, the current signal variation was studied using an electrochemical workstation with STCFs stretched periodically. Finally, we fabricated transparent flexible circuits for light-emitting diodes (LEDs) and tension sensors for knuckles to detect their real-time motion. The LEDs worked well in the circuits, and the sensor quickly responded to knuckle bending, which demonstrated that STCFs would have good prospects in flexible electronics.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 22
·26465-26479
·
IF 2.478
Zhu Wanrong,Song Jimei,Wang Xule,Lu Yun,Hu Gang,Yang Jie
A series of Ag/AgBr/BiOBr photocatalysts with different weight contents of Ag/AgBr were successfully constructed via a simple precipitation method in 80 °C water bath. Photocatalysts were characterized by XRD, XPS, SEM, TEM, N 2 Adsorption-Desorption (BET), and UV–Vis Diffuse Reflectance Spectroscopy (DRS). Compared with BiOBr and Ag/AgBr, all the composite photocatalysts show the prominent photocatalytic activity for the degradation of tetracycline (TC). Especially, 1:5Ag/AgBr/BiOBr (20%) has the highest reaction rate constant (kapp = 0.20 min −1 ). Moreover, according to the results of radical scavengers runs, ·OH and h + acted as the main reactive species in the degradation process. Based on above, a possible photocatalytic mechanism for organics degradation over Ag/AgBr/BiOBr was proposed. Interestingly, the redox cycle between O 2 /·O 2 − and Br − /Br 0 assisted with the surface plasmon resonance (SPR) effect of silver dramatically promotes the separation and transfer of electron–hole pairs, and improves the photocatalytic activity of the as-obtained composite samples.
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CHEMICAL PAPERS
·
2021
·Vol. 75
·期 7
·3679-3693
·
IF 2.097
Cheshari Emily C.,Ren Xiaohui,Li Xin
Carbamate pesticides are popularly used in agriculture due to their relatively low toxicity and their more degradable nature compared to organophosphates. Resultant residues pose a threat to human and animal health, aquatic systems and wildlife. Carbaryl and thiodicarb are used to control pests in a variety of agricultural crops. Monitoring the level of these pesticides in the environment is crucial in ensuring environmental safety. Multi-template imprinted polymers combined with surface enhanced Raman spectroscopy (SERS) are attractive for sensitive and effective multiple analyte detection for application in pesticide residue studies in environmental matrices. A core–shell Ag-dual template molecularly imprinted polymer (MIP) composite was synthesized and evaluated in this study. Computational design was used to study intermolecular interactions in the pre-polymerization mixture between methylacryamide (MAM) (functional monomer) and the templates carbaryl (CBL) and thiodicarb (TDC). The interaction between the computer simulated template-functional monomer complexes was evaluated by examining the hydrogen bonds to provide insights on the observed binding performance of the dual imprinted polymer. The MIP was then synthesized and its binding properties towards CBL and TDC investigated experimentally. More so, we compared the performance of the mono-template MIP materials and the dual-template MIP material in detection of the templates. The experimental results corroborate the computer simulation results and reveal that CBL has higher adsorption capacity as supported by higher number of hydrogen bonds in the template monomer complex. Therefore, the study presents a cost-effective approach that utilizes a dual-template imprinted polymer for detection of carbamate pesticide residues.
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Atian Xie,Jiuyun Cui,Jin Yang,Chunxiang Li,Yi Wang,Jiangdong Dai
The effective treatment of oily wastewater is of great significance for the protection of the ecological environment and human health. Aiming to prepare a membrane with excellent antifouling properties, a new active antifouling carbon cloth@Ni-Co LDH/Ag (CC@LDH/Ag) membrane was reported here via in situ hydrothermal growth and followed photo-deposition methods. The effects of Ag deposition on self-cleaning ability and surface wettability of CC@LDH/Ag membrane were studied. The experimental results showed CC@LDH/Ag membrane is superhydrophilic/underwater superoleophobic, and exhibited high separation efficiency (>98.6%) and high flux (6551–22,050 L m −2 h −1 ) for different kinds of oil/water mixtures. Moreover, CC@LDH/Ag membrane also displayed excellent environmental and mechanical durability. Good self-cleaning ability enabled CC@LDH/Ag membrane to be separated at least 30 times, and still maintained high separation performance. The self-cleaning CC@LDH/Ag membrane may hold great application prospects in oily wastewater remediation.
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