查找使用阿拉丁产品的科研文献

Multifunctional polydopamine-carboxymethyl cellulose composite gels with Ag/AgCl/ZnO heterojunction to enhance sunlight-responsive photocatalytic activity

Jiayin Wang,Chongjun Huang,Yilong Tu,Zhanye Chen,Yiqing Zhao,Yu Ke

Carboxymethyl cellulose (CMC) gel is an ideal substrate for supporting sunlight responsive photocatalysts, but the photocatalytic disinfection activity decreased due to the light-shielding effect of the gel. In order to enhance the formation of active oxygen species, polydopamine (PDA) was introduced in CMC gels to function as an intermediate to connect two semiconductors inside the gels via its quinhydrone charge-transfer complexation. CMC/PDA gel with a double-network was formed via chemical crosslinking and reversible hydrogen bonding between prepolymerized PDA and CMC, then Ag/AgCl, ZnO and Ag/AgCl/ZnO photocatalysts were formed in situ in CMC/PDA gel, respectively. Ag/AgCl/ZnO heterojunction loaded composite gel displayed a remarkable photocatalytic degradation activity, with a weight ratio of the degraded methyl orange divided by composite gels up to 0.00090 under sunlight irradiation for 30 min. Ag/AgCl/ZnO loaded gel presented the bactericidal rate of 99.9 % against E. coli and 99.8 % against S. aureus . The inhibition zone of Ag/AgCl/ZnO loaded composite gel with dopamine mass of 100 mg increased under 6 h of sunlight compared with 24 h in dark against both E. coli and S. aureus . The biocompatible Ag/AgCl/ZnO loaded composite gel with pH-responsive swelling property and sunlight-responsive antibacterial activity promised to broaden the application of CMC-based antibacterial gels.

Facile fabrication of high-performance electrochromic fabrics based on flexible Ag/Ni mesh electrode with exceptional conductivity

Zhiyi Guo,Tengfei Li,Hao Zhou,Changwei Tan,Ximei Wang,Shuhong Nie,Wenya Xu,Fangfang Pei,Xiuqing Meng,Xinzhou Wu,Xiaolian Chen,Wenming Su,Kai Zhao,Changqing Ye

Flexible electrochromic devices (FECDs) and electrochromic fabrics (ECFs) have attracted great attention in fashion clothing decoration and camouflage due to their low energy consumption and bi-stability. However, the complex and hierarchical structures of fabric substrates pose formidable challenges to the excellent and stable conductivity of ECFs. Here, we developed novel ECFs with excellent EC properties and outstanding stability by integrating FECDs with polyester fabric. Firstly, highly conductive silver (Ag)/nickel (Ni) mesh was heat-laminated on the thermoplastic polyurethane (TPU) film, serving as flexible electrode with high transmittance. On this basis, the FECDs exhibit an exceptionally high transmittance (46.4 %), rapid response time (bleaching for 0.5 s at 0.8 V and coloring for 0.9 s at −0.4 V), outstanding stability (2.6 % decreased after 5000 cyclic switching), and low-power consumption (<0.05 J per cycle in 60 cm 2 FECDs). By harnessing the thermoplastic property of TPU, the FECDs can be readily transferred to fabric for the realization of ECFs, without compromising their comprehensive performances. More importantly, the outstanding conductivity and mechanical stability of ECFs under various challenging conditions (mechanical bending, physical damage, etc.) are unparalleled. We believe the simple-structured high-performance ECFs would be promising for flexible smart textile in any textile-based markets, such as wearable and intelligence camouflage.

Insights into Electron Dynamics in Mn-Doped Ag–In–S Quantum Dots for Efficient Photoelectrocatalytic Hydrogen Evolution

Anqiang Jiang,Heng Guo,Shan Yu,Fengying Zhang,Xuan Zhang,Limin Xu,Yi Li,Chun Tang,Xin Tu,Ying Zhou

The electron transfer mechanism involving multiple trapping states has great implications for dictating the photoelectrochemical (PEC) hydrogen evolution reaction (HER). Uncovering the ultrafast dynamics of multiple trapping states in defect-rich catalysts to suppress undesirable Shockley–Read–Hall (SRH) recombination and boost electron extraction remains a crucial yet challenging task. Herein, we bypass defect-induced SRH recombination sites and redirect more excited electrons toward the HER by engineering an additional electron transfer channel within Ag–In–S quantum dots (AIS QDs) via Mn doping. Photoluminescence spectroscopic studies indicate effective charge carrier transfer from the band edge to the doping states, inducing a 5.3-fold enhancement in the electron transfer rate. Using ultrafast transient absorption spectroscopy, we reveal that host photoexcitation leads to subpicosecond electron transfer from the conduction band to the empty Mn2+ d-orbitals in Mn-doped QDs, and the resultant charge transfer state shortens the excited-state electron transfer lifetime from 3.73 to 1.19 ns, corresponding to a 300% acceleration of carrier depopulation and enhancing excited electron availability. Moreover, the evolution of the product composition indicates the improved interfacial utilization of holes, as the applied PEC bias relieves kinetic constraints on hole transfer. Consequently, a saturated photocurrent density of 8.6 mA cm–2 at 0.5 V vs RHE was achieved for the as-fabricated PEC device under one-sun irradiation, comparable to the latest bare heavy-metal-free QD-based PEC systems. These results underscore that modulating electron dynamics, previously dominated by intrinsic defects, through intermediate energy levels is a promising strategy to enable high-efficiency PEC solar energy conversion.

Photo-programmable AgCl@Ag nanoparticles enable sequential antibacterial action and durable dentin bonding for deep caries management

Qiaojie Luo,Zhenzhen Zhang,Yadong Chen,Chang Shu,Yajie Cheng,Yanji Lu,Jiajia Xu,Xiaodong Li

Deep caries management faces a critical dilemma: preserving pulp vitality versus ensuring durable restoration. Current dentin bonding technique and materials fail to eliminate residual pathogens in preserved soft dentin or stabilize resin-dentin interfaces against enzymatic/microbial degradation. Here, we present a light-programmable AgCl@Ag nanoparticle system that overcomes these dual challenges through dynamic nanochemistry. By orchestrating in situ AgCl deposition and photoreduction, our strategy achieves three breakthroughs: (1) Structural reinforcement: Polarity-driven Ag + chelation masks polar groups in demineralized dentin matrix (DDM), releasing interface confined water while doubling DDM modulus, greatly enhancing BisGMA infiltration to realize hermetic seal at the cavity periphery; (2) Sequential antibacterial action: Ag + rapidly penetrates biofilms to form AgCl NPs, followed by light-triggered transformation from AgCl NPs to AgCl@Ag NPs to generate Cl₂/HClO for residual pathogen eradication, to achieve a bacteria-free environment; (3) Self-stabilizing interface: Reducible AgCl@Ag nanoparticles inhibit MMPs and resist microbes and aging-induced delamination. This photo-responsive system eliminates secondary caries risk while maintaining pulp vitality, seamlessly integrating with clinical workflows. Through spatiotemporal control of silver chemistry, we redefine dental adhesion as intelligent platform to construct a biointerface that concurrently achieve sterilization, structural optimization, and enzymatic resistance. Our work establishes a paradigm for adaptive material design in moist biological environments, with implications extending to bone adhesives and chronic wound management.

Preparation and conductive mechanism study of Ag/PS core-shell particles for high-performance anisotropic conductive films

Mengxiang Liu,Jin Shi,Tao Zhang,Miao Li,Yu Zhang,Runze Zhang,Yewei Zhang,Bin Yang,Jiale Fan,Kaibo Yu

Anisotropic conductive films (ACFs) are promising materials for flexible electronics and wearable devices due to their excellent electrical conductivity and mechanical flexibility. However, simultaneously achieving high conductivity, superior mechanical properties, and long-term stability remains a critical challenge. In this study, polystyrene (PS) microspheres were surface-functionalized with acrylic acid to introduce carboxyl groups, enhancing surface reactivity for subsequent electroless silver plating. When the mass ratio of AgNO₃ to PS was 2:1, the prepared Ag/PS core–shell conductive particles exhibited a dense and continuous silver layer with an average thickness of ∼45 nm and an electrical resistivity of 2.03 × 10⁻³ Ω·cm, confirming their excellent conductivity. The epoxy resin-based ACFs prepared using these particles remained electrically insulating in both the X- and Y-directions while exhibiting a Z-axis resistivity of 6.67 × 10¹ Ω·cm after hot pressing. Furthermore, at a hot-pressing pressure of 2 MPa, the resistance was reduced to 1.2 Ω, while the shear strength reached a maximum of 1.8 MPa. The conductive mechanism of ACFs was systematically investigated by analyzing the morphological evolution of conductive particles under varying hot-pressing pressures. Additionally, the ACFs maintained stable electrical performance after 33 days of storage at 0 °C, meeting industrial transportation and storage requirements. This study provides valuable insights into the structural design and performance optimization of conductive fillers, contributing to the development of high-performance ACFs for microelectronic and flexible device applications.

Low-temperature ethanol gas-sensing performances of porous Ag-doped SnO2: Structure-performance correlation and mechanism insight

Yecheng Liang,Jianchun Qin,Shunyan Ning,Jishu Zeng,Zheyu He,Jianing Xu,Kangcheng Chen,Jun Cai,Weilong Zhong,Long Hu,Yimin Li

Ethanol gas detection is vital for industrial processes like brewing and biofuel production, and for safety in medical and transportation systems. However, the response and selectivity of tin dioxide (SnO 2 ) towards ethanol gas still exhibit serious limitations at relatively low temperatures. In this study, the porous Ag-SnO 2 composites were successfully synthesized by using sacrificial carbon nanotubes (CNTs) template-assisted hydrothermal synthesis, enhancing the sensitivity and selectivity towards ethanol gas. Specifically, Ag-SnO 2 nanoparticles were uniformly grown on the surface of CNTs via a hydrothermal method, followed by calcination to remove the CNTs, and obtained porous Ag-SnO 2 composites. The composites demonstrated excellent ethanol sensing characteristics: high response magnitude, excellent selectivity, good stability, and wide detection concentration range. The porous structure significantly increased surface area and gas adsorption of SnO 2 , while Ag doping enhanced surface catalytic activity. This work provides a promising approach for designing high-performance, low-temperature SnO 2 -based ethanol sensors.

Detection of pesticide residue using an Fe3O4/GO/Ag nanocomposite as a SERS substrate and mechanism investigation

Rui Wu,Xi Song,Yulin Wang,Qiang Zhang

Considering that pesticide residues cause significant harm to health and the environment, it is crucial and urgent to fabricate surface-enhanced Raman scattering (SERS) substrates with high sensitivity to detect pesticide residues. In this study, a three-layer structure of multifunctional Fe3O4/GO/Ag nanoparticles (NPs) as an active substrate for SERS was fabricated and comprehensively characterized through X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), elemental mapping, and X-ray photoelectron spectroscopy (XPS). The active substrate was used to detect thiram pesticide through SERS. Combined with the synergistic effect, Ag NPs and graphene oxide (GO) possessed high-density and ordered hot spots to enhance the electromagnetic field; therefore, signal amplification and fascinating sensitivity were achieved. The lowest concentration of thiram for clear presentation of the peak was 10−12 mol L−1. There was a satisfactory linear relationship, ranging from 10−10 to 10−4 mol L−1, with a low limit of detection, high sensitivity, satisfactory enhancement factor (EF), stability, and repeatability. In addition, Fe3O4/GO/Ag was successfully applied to identify pesticide residues in a practical sample. Furthermore, the enhancement mechanism, including electromagnetic enhancement and chemical reinforcement, is discussed in detail. Fe3O4/GO/Ag is a potential active substrate for SERS and can be applied for rapid detection in the food industry, environmental fields and biomedicine with fascinating sensitivity.

Modulation of polymorphic structure of Ag/Ce–MOFs materials and its adsorption mechanism of Minocycline in water

Lei Zhang,Tian Ai,Nan Zhang

Minocycline (MNC), as a second-generation semi-synthetic derivative of tetracycline, poses a potential carcinogenic threat to organisms in water, therefore high efficient removal of MNC is becoming a crucial key for water quality safety. This study has been successfully synthesized Ag/Ce bimetallic–doped MOF materials with diverse morphological characteristics by using microwave digestion and solvothermal methods, and it was demonstrated a significant adsorption potential in MNC from aqueous solutions. The characterization results were revealed that Ce exhibits oxygen vacancy enrichment as the central metal in MOFs, while Ag was distributed on carbon framework in the form of Ag 0 NPs, both of morphological features were provided more active sites for adsorption. The Ag/Ce–MOFs was achieved 98.26 % exceptional MNC adsorption efficiency at pH 9, which was followed a multilayer exothermic chemisorption mechanism. The results were shown that the maximum adsorption capacity of Ag/Ce-MOFs was 476.2 mg/g in Langmuir model, which was much more substantially surpassed than Ce–MOFs. In addition, the adsorption process was primarily mediated through hydrogen bonding, ligand interactions and amidation reactions. Furthermore, the Ag/Ce–MOFs exhibited the excellent regeneration performance and broad applicability, which was shown remarkable adsorption potential in removing various other pharmaceutical contaminants in water. In summarization, the synthesized Ag/Ce–MOFs by microwave digestion and solvothermal technology, were demonstrated the board promising prospects in efficient MNC removal in water treatment applications.

Bimetallic-ZIFs derived quaternary amorphous LDHs decorated with crystalline Ag nanoparticles for highly efficient oxygen evolution reaction

Xiaodong Yang,Feifei Peng,Longfei Zhang,Xiang Wang,Shulin Liu,Wei Yang,Luhong Zhang,Na Yang

Amorphous LDHs materials have been considered promising electrocatalysts for OER since their abundant coordination sites but still undergo poor stability. It is an efficient strategy to rationally architect amorphous/crystalline hybrid nanostructures on the ZIFs-derived amorphous LDH counterparts. Herein, we provide a facile two-step method to fabricate crystalline Ag NPs decorated amorphous QLDHs (Ag/QLDHs) nanosheet arrays on the Ni foam through ions exchange and spontaneous redox reaction. Based on the multi-metal synergetic effects (Co, Zn, Fe, Ni) and regulation of Ag nanoparticles (NPs), the as-formed Ag/QLDHs with heterogeneously hierarchal structures exhibit excellent OER performance with a low overpotential of 216 and 247 mV under 10 and 100 mA cm −2 in 1 M KOH, respectively, together with highly structural robustness. Through using the in situ-Raman spectroscopy, we reveal that the Ag NPs play the important role in enhancing the oxidation state of Ni and Fe species in Ag/QLDHs, which facilitates the generation of active MO x (OH) y at a much lower potential. The synthesized approach proposed in this work will supply a promising pathway for constructing amorphous/crystalline hybrid structures applied to alkaline water oxidation.

Monodisperse spherical Ag+ doped Cs2KBiCl6 nanocrystals： utilizing steric hindrance engineering for inkjet printing of anti-counterfeiting patterns

Shaoli Song,Youlun Zhu,Hanmei Jiang,Huichao He,Qian Yang,Jianbei Qiu,Tao Han

Anti-counterfeiting is one of the critical application fields of luminescent materials. Nanocrystal luminescent materials are more suitable for anti-counterfeiting applications because they are tiny and more conducive to patterning. The preparation of monodisperse and spherical lead-free perovskite nanocrystals by a propagable method is a hot topic in anti-counterfeiting materials. In this work, monodisperse spherical Ag+ doped Cs2KBiCl6 nanocrystals with an average diameter of 3.511 nm were prepared by using the propagable ligand-assisted reprecipitation method at room temperature, attributed to steric hindrance engineering with increasing the ligand size. Due to the lattice distortion caused by doping relaxing the transition prohibition, excited by 365nm ultraviolet light, the nanocrystals exhibit orange emission peaking at 600nm, which is related to the transition recombination of Bi3+ (1S0→3P1), and the maximum photoluminescence quantum yield is 3.80%. A printable ink is prepared by combining the nanocrystals with PDMS adhesive and its curing agent, which can be used for inkjet printing of anti-counterfeiting patterns.

A dual pH and redox-responsive Ag/AgO/carboxymethyl chitosan composite hydrogel for controlled dual drug delivery

Yanqin Xu,Jie Liu,Shumin Guan,Yuan Cao,Changguo Chen,Dan Wang

Ultrasensitive electrochemical sensor for Hg2+ by using hybridization chain reaction coupled with Ag@Au core–shell nanoparticles

Zongbing Li,Xiangmin Miao,Ke Xing,Xue Peng,Aihua Zhu,Liansheng Ling

A novel electrochemical biosensor for Hg 2+ detection was reported by using DNA-based hybridization chain reaction (HCR) coupled with positively charged [email protected] core-shell nanoparticles ((+) [email protected] CSNPs) amplification. To construct the sensor, capture probe (CP ) was firstly immobilized onto the surface of glass carbon electrode (GCE). In the presence of Hg 2+ , the sandwiched complex can be formed between the immobilized CP on the electrode surface and the detection probe (DP) modified on the gold nanoparticles (AuNPs) based on T-Hg 2+ -T coordination chemistry. The carried DP then opened two ferrocene (Fc) modified hairpin DNA (H 1 and H 2 ) in sequence and propagated the happen of HCR to form a nicked double-helix. Numerous Fc molecules were formed on the neighboring probe and produced an obvious electrochemical signal. Moreover, (+) [email protected] CSNPs were assembly onto such dsDNA polymers as electrochemical signal enhancer. Under optimal conditions, such sensor presents good electrochemical responses for Hg 2+ detection with a detection limit of 3.6   pM. Importantly, the methodology has high selectivity for Hg 2+ detection.