Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Liu Jing-Yuan,Chen Ling,Wu Li-Ming
The argyrodite Ag 9 GaSe 6 is a newly recognized high-efficiency thermoelectric material with an ultralow thermal conductivity; however, liquid-like Ag atoms are believed to cause poor stability and performance irreproducibility, which was evidenced even after the 1 st measurement run. Herein, we demonstrate the abovementioned instability and irreproducibility are caused by standard thermoelectric sample hot-pressing procedure, during which high pressure promotes the 3-fold-coordinated Ag atoms migrate to 4-fold-coordinated sites with higher-chemical potentials. Such instability can be eliminated by a simple annealing treatment, driving the metastable Ag atoms back to the original sites with lower-chemical potentials as revealed by the valence band X-ray photoelectron chemical potential spectra and single crystal X-ray diffraction data. Furthermore, the hot-pressed-annealed samples exhibit great stability and TE property repeatability. Such a stability and repeatability has never been reported before. This discovery will give liquid-like materials great application potential.
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Cong Fu,Lingfang Liu,Guofeng Zhao
The effect of noble metal cocatalyst loading on the concentration of surface-reaching photoexcited charges on semiconductors is an interesting and important issue in photocatalysis. Herein, through in situ diffuse-reflectance infrared spectroscopy (DRIFTS), an adsorbate (methanol) surface elementary reaction kinetic analysis method has been exploited to track the concentration of surface-reaching photoholes in a series of Ag/TiO2 nanoparticles with varied Ag loading. The photocatalytic oxidation of adsorbed methanol species on the Ag/TiO2 surface proceeds via first-order reaction kinetics. Thus, the measured reaction rate constants directly reflect the concentration of surface-reaching photoholes under light irradiation. By determining the specific reaction rate constants for methanol oxidation on the Ag/TiO2 surface, we discover that the concentration of surface-reaching photoholes under light irradiation exhibits a volcano-shaped dependence on the Ag loading. Under the optimized Ag loading, it could be found that the concentration of surface-reaching photoholes on Ag/TiO2 surface is nearly 1.5 times greater than that of the pristine TiO2 surface. These results provide, for the first time, unambiguous experimental evidence for the significance of modification with suitable noble metal cocatalysts on regulation of surface-reaching photoexcited charges in semiconductor-based photocatalysis.
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Thi-Ngat Tran,Van Huan Bui,Thanh Thao Phan,Duy-Nam Phan
The development of multifunctional membranes with self-cleaning and antibacterial properties is a significant pursuit in advanced materials science for the application of water and air filtration. Novel nanocomposite membranes composed of electrospun cellulose nanofibers (CL nanofibers) modified with silver-doped titanium dioxide (Ag-TiO 2 ) nanoparticles were successfully prepared with average fiber diameters to be in the range of 316 nm to 348 nm and doped and undoped TiO 2 nanoparticle sizes from 9.74 nm to 14.17 nm. The self-cleaning performance, derived from photochemical activity, was systematically evaluated against common organic stains, including green tea, red wine, and coffee, under simulated solar irradiation (Xenon lamp), demonstrating up to 55.27 %, 81.38 %, and 77.83 % stain degradation, respectively. The composite membranes containing 2 % Ag doped TiO 2 exhibited potent antibacterial activity, effectively inhibiting both representative Gram-positive ( Staphylococcus aureus ) and Gram-negative ( Escherichia coli ) bacteria with bacterial reduction of 99,98 % and 99,99 %, respectively. These results highlight that strategic combination of electrospinning and nanoparticle immobilization provides a powerful route to designing multifunctional hybrid materials, demonstrating significant potential for diverse real-world applications such as smart textiles, self-cleaning filtration membranes, and antimicrobial surfaces.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Yanfen Wang,Pengfei Jia,Jie Ai,Gangzheng Liu,Shuangshuang Liu,Juan Gao,Zhaoqi Sun
Novel Ag/ZnO composite nanoflowers (CNFs) had been designed as a surface-enhanced Raman scattering (SERS) substrate for organic molecule detection. Flower-like ZnO architecture was firstly synthesized by a low-temperature precipitation method, and subsequently Ag nanoparticles were decorated on ZnO nanoflowers through a photochemical reaction. The optimal Ag component was investigated by changing the photo-reduction time of Ag + in the ZnO precursor solution. It is found that the Ag nanoparticles with suitable size and crystallinity are significantly related to the light absorption and Raman signals for Ag/ZnO substrate. For Rhodamine 6G (R6G) as probe molecules, the optimal Ag/ZnO-40 min CNFs achieve a low detection limit of 1.0 × 10 −12 M and a high enhanced factor (EF) of 1.74 × 10 6 . Due to its excellent photocatalytic activity, the Ag/ZnO active substrate effectively degrades R6G molecules adsorbed on the surface, displaying an excellent self-cleaning property and stable recyclability. Such a superior SERS performance can be attributed to the synergy effect of two components (Ag nanoparticles and ZnO nanoflowers) such as its unique architecture, charge transfer and high-density hot spots.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Qiang Jiang,Bo Chen,Kewei Zhang,Ya Yang
Li-ion batteries are a green energy storage technology with advantages of high energy density, long lifetime, and sustainability, but they cannot generate electric energy by themselves. As a novel energy-harvesting technology, triboelectric nanogenerators (TENGs) are a promising power source for supplying electronic devices, however it is difficult to directly use their high output voltage and low output current. Here, we designed a Ag nanoparticle-based TENG for scavenging wind energy. After including a transformer and a power management circuit into the system, constant output voltages such as 3.6 V and a pulsed current of about 100 mA can be obtained, which can be used to directly light up a light-emitting diode. Furthermore, the produced electric energy can be effectively stored in a WO3/LiMn2O4 electrode based Li-ion battery. Our present work provides a new approach to effectively scavenge wind energy and store the obtained electric energy, which is significant for exploring self-charging power units.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Qi Xu,Rui Tian,Chao Lu,Haifang Li
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) in the low-molecular-weight (LMW) range is a long-standing challenge because of the fragments from the matrix and the heterogeneity of the matrix-analyte crystals. In this work, a homogeneous film with the monodispersed Ag nanoparticles (Ag NPs) in the confined interlayer of layered double hydroxides (LDHs) has been achieved. The Ag NPs with advantageous optical absorption could realize the energy capture and transfer process, and LDHs with abundant hydroxyl groups are beneficial for the deprotonated reaction. Therefore, the as-prepared film exhibited interference-free deprotonated signals in negative-ion mode with high ionization efficiency. The uniform matrix-analyte spots were constructed through the homogeneous assembly process, contributing to the high reproducibility for both the liquid and gaseous samples. Good linearities were successfully realized in the range from 0.1 μM to 1.0 mM for glucose with the relative standard deviation (RSD) of 3.8%, and 0.2–2.0 mM with the average RSD of 4.5% for psoralen samples, respectively. It is believed that the proposed matrix could exhibit competitive advantages for MALDI detection in the LMW region, which may provide new insight into development for MALDI mass detection.
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CARBOHYDRATE POLYMERS
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2018
·
IF 5.158
Chao Duan,Jingru Meng,Xinqi Wang,Xin Meng,Xiaole Sun,Yongjian Xu,Wei Zhao,Yonghao Ni
A novel cellulose-based antibacterial material, namely silver nanoparticles@ metal-organic frameworks@ carboxymethylated fibers composites (Ag NPs@ HKUST-1@ CFs), was synthesized. The results showed that the metal-organic frameworks (HKUST-1) were uniformly anchored on the fiber’s surfaces by virtue of complexation between copper ions in HKUST-1 and carboxyl groups on the carboxymethylated fibers (CFs). The silver nanoparticles (Ag NPs) were immobilized and well-dispersed into the pores and/or onto the surfaces of HKUST-1 via in situ microwave reduction, resulting in the formation of novel Ag NPs@ HKUST-1@ CFs composites. The antibacterial assays showed that the as-prepared composites exhibited a much higher antibacterial activity than Ag NPs@ CFs or HKUST-1@ CFs samples.
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PubMed
高影响因子
Biomaterials Science
·
2022
·Vol. 10
·期 5
·1281-1291
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IF 7.59
Yanan Wang,Zikang Xu,Wenchi Li,Wei Wei,Mengqi Qin,Qun Li,Xuexia Liu,Xu Zhang,Xiaolei Wang
Excessive fibrosis is the major factor in the failure of glaucoma filtration surgery. So far, the dominant approach for inhibiting fibrosis is the use of an antimetabolite drug, but the complications it causes, such as filtering bleb leakage, bacterial endophthalmitis and ocular hypotony, are also inevitable. Herein, a multifunctional anti-scarring platform (PVA@rGO-Ag/5-Fu) integrated with outstanding photothermal, antibacterial and drug delivery abilities is developed. PVA@rGO-Ag shows favorable biocompatibility as well as an accurate regional photothermal killing ability on both conjunctival fibroblasts and bacteria under 808 nm near-infrared (NIR) irradiation. Furthermore, PVA@rGO-Ag/5-Fu improves bleb survival rates and results in the satisfactory reduction of intraocular pressure (IOP) by decreasing the fibrous reaction in vivo. In summary, PVA@rGO-Ag/5-Fu has promising potential as an efficacious and safe anti-scarring agent for filtering surgery.
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PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 7
·906-917
·
IF 4.5
Zou Min,Tan Chao,Yuan Zhengqiu,Wu Ming,Jian Jian,Zhang Lei,Zhang Yan,Ma Zhou,Zhou Hu
The industrial application of nano-photocatalysts in wastewater treatment has been severely restricted for a long time due to their difficult separation, poor reusability, and low efficiency. In this work, a facile strategy was proposed to enhance the photocatalytic activity and recovery performance of Ag@AgCl nanocatalysts. Biological veins (Bio-veins) with a unique 3D porous construction were used as carriers for the in-situ growth of Ag@AgCl nanoparticles. Scanning electron microscopy results showed that the Ag@AgCl nanoparticles were uniformly loaded on the surface and interior of the Bio-veins, and the size of the Ag@AgCl nanoparticles immobilized on the Bio-veins (50–300 nm) was significantly smaller than Ag@AgCl obtained by the co-precipitation method (1–3 µm). The Bio-veins played a vital role in the photocatalysis reaction system. The degradation efficiency of the Ag@AgCl/Bio-veins(CI4) was up to 3.50 times as high as pure Ag@AgCl. Furthermore, the composites also exhibited excellent recyclability and stability under both visible and solar light. This work provided a suitable strategy for nanophotocatalysts for practical application and may also offer new possibilities for the high-value utilization of biomass materials.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·885
·
IF 5.3
Xingzhen Liu,Weijin Qian,Yawei Chen,Mingliang Dong,Taxue Yu,Weijun Huang,Changkun Dong
CNTs and CNT-MgO, CNT-MgO-Ag, and CNT-MgO-Ag-BaO nanocomposites were grown on alloy substrates using an electrophoretic deposition method and their field emission (FE) and hydrogen sensing performances were investigated. The obtained samples were characterized by SEM, TEM, XRD, Raman, and XPS characterizations. The CNT-MgO-Ag-BaO nanocomposites showed the best FE performance with turn-on and threshold fields of 3.32 and 5.92 V.μm−1, respectively. The enhanced FE performances are mainly attributed to the reductions of the work function, and the enhancement of the thermal conductivity and emission sites. The current fluctuation of CNT-MgO-Ag-BaO nanocomposites was only 2.4% after a 12 h test at the pressure of 6.0 × 10−6Pa. In addition, for the hydrogen sensing performances, the CNT-MgO-Ag-BaO sample showed the best increase in amplitude of the emission current among all the samples, with the mean INincreases of 67%, 120%, and 164% for 1, 3, and 5 min emissions, respectively, under the initial emission currents of about 1.0 μA.Keywords:CNT-MgO-Ag-BaO nanocomposite;electrophoretic deposition;field emission;tensile test;stability;hydrogen sensing
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KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Peng Cheng Ruan,Hai Feng Chen,Jing Ling Hu,Jian Qiang Ye
Using Bi (NO3)3•5H2O, NH4VO3 as raw material and AgNO3, the Ag/BiVO4 were successfully prepared by a low-temperature solid-phase reaction. And Ag/BiVO4 samples were characterized by X-ray diffraction (XRD), Differential thermal analysis (DTA) and UV - visible diffuse reflectance spectroscopy (DRS). The Methyl Orange (MO) was simulated as the sewage under the visible light to study the influence of the illumination time and the amount of photocatalyst. The visible-light absorption scopes of BiVO4 were broaden by doping Ag, the UV-Visible absorption edge were slightly red shifted and the band gap was narrower comparing with the pure BiVO4. It was found that the catalytic effect of the Ag doped catalysts enhanced under the visible-light irradiation. And the cause of the enhanced catalytic effect also has been analyzed and discussed in the article.
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RSC Advances
·
2016
·Vol. 6
·期 73
·69580-69585
·
IF 3.289
Xingrong Xiao,Nuoxin Xu,Yongchang Jiang,Qilong Zhang,Enjie Yu,Hui Yang
Ag-loaded TiO2 hybrid particles (TiO2@Ag) were synthesized as fillers by using an ethylene glycol reduction method. Based on this, the TiO2@Ag/P(VDF-HFP) hybrid films were prepared by embedding TiO2 nanoparticles in a poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] matrix. Morphology and thermal analysis show that the introduction of TiO2@Ag does not disrupt the continuity of the polymer matrix, while the strong interaction between fillers and matrix influences the crystallization process of the composite. The adhesion of Ag to TiO2 efficiently separates the Ag particles from connecting and suppresses the formation of a conductive network, and the ultra-small Ag nanoparticles “trap” the carriers due to coulombic blockade and quantum confinement effect, which results in low dielectric loss and electrical conductivity of the composites. As a consequence, the dielectric permittivity of polymer nanocomposites was enhanced by 300% over the P(VDF-HFP) matrix at a filler content of 30 vol% while maintaining a rather low dielectric loss (0.037 at 1 kHz), demonstrating promising applications in electronic devices.
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