Decoration Of Silver Nanoparticles Research Articles

Decoration of silver nanoparticles on nitrogen-doped nanoporous carbon derived from zeolitic imidazole framework-8 (ZIF-8) via in situ auto-reduction.

We discovered an in situ auto-reduction method to embed silver nanoparticles onto a nanoporous carbon (NC) derived from the zeolitic imidazole framework-8 (ZIF-8), without any requirement of the reducing agents. The detailed analysis demonstrated the formation of Ag NPs by the replacement of the metallic Zn residue in the NC with Ag ions. The synthesized Ag@NC exhibited a superior catalytic activity toward the reduction reaction of 4-nitrophenol into 4-aminophenol.

Polymer-Based Graphene Derivatives and Microwave-Assisted Silver Nanoparticles Decoration as a Potential Antibacterial Agent.

Nanocomposites obtained by the decoration of graphene-based materials with silver nanoparticles (AgNPs) have received increasing attention owing to their antimicrobial activity. However, the complex synthetic methods for their preparation have limited practical applications. This study aims to synthesize novel NanoHybrid Systems based on graphene, polymer, and AgNPs (namely, NanoHy-GPS) through an easy microwave irradiation approach free of reductants and surfactants. The polymer plays a crucial role, as it assures the coating layer/substrate compatibility making the platform easily adaptable for a specific substrate. AgNPs’ loading (from 5% to 87%) can be tuned by the amount of Silver salt used during the microwave-assisted reaction, obtaining spherical AgNPs with average sizes of 5–12 nm homogeneously distributed on a polymer-graphene nanosystem. Interestingly, microwave irradiation partially restored the graphene sp2 network without damage of ester bonds. The structure, morphology, and chemical composition of NanoHy-GPS and its subunits were characterized by means of UV-vis spectroscopy, thermal analysis, differential light scattering (DLS), Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive X-ray analysis (EDX), Atomic Force Microscopy (AFM), and High-Resolution Transmission Electron Microscopy (HRTEM) techniques. A preliminary qualitative empirical assay against the typical bacterial load on common hand-contacted surfaces has been performed to assess the antibacterial properties of NanoHy-GPS, evidencing a significative reduction of bacterial colonies spreading.

Green synthesis and surface decoration of silver nanoparticles onto δ-FeOOH-Polymeric nanocomposite as efficient nanocatalyst for dyes degradation

In the present work, a green method has been developed to fabricate a novel nanocatalyst by the coupling of silver nanoparticles (Ag-NPs) onto δ-FeOOH and urea-formaldehyde polymer (PUF) using microwave irradiation heating process for the production AgNPs@δ-FeOOH/PUF. Several FT-IR functional groups as CO, CN, CN, CO and Fe-O were characterized in the assembled AgNPs@δ-FeOOH/PUF. The XRD diffraction peaks of silver nanparicles are well-matched to the cubic crystal structure of AgNPs to refer to a cubic crystal structure of AgNPs. The XPS analysis of AgNPs(0.5 wt %)@δ-FeOOH/PUF nanocatalyst confirmed the presence of Ag, N, O, C and Fe elements. The TEM image and histogram for particle size distribution of AgNPs@δ-FeOOH/PUF nanocatalyst showed the appearance of spherical particles on the surface of PUF with average size 10 nm. Moreover, AgNPs(0.5 %wt)@δ-FeOOH/PUF nanocatalyst exhibited brilliant efficiency in the catalytic hydrogenation of two selected azo dyes, methyl orange (MO) and congo red (CR) with high TOF in different loading contents of AgNPs/CP as 0.818 and 0.436 s−1, respectively. In addition, AgNPs@δ-FeOOH/PUF nanocatalyst showed good reusability as well as highly activity for reduction conversion of MO and CR into 100 to 89 %, respectively in few minutes after five cycles. The AgNPs@δ-FeOOH/PUF nanocatalyst with high TOF may be potential candidate as a workable and efficient nanocatalyst in treatment of environmental samples such as sea water (degradation efficiency percent is 80.62 % for MO and 81.51 % for CR).

Synthesis of biocompatible chitosan decorated silver nanoparticles biocomposites for enhanced antimicrobial and anticancer property

Numerous studies investigated the biosynthesis of silver nanoparticles (AgNPs); however, there is a large gap for the ideal time-consuming process and their cytotoxicity. Herein, for the first time, rapid AgNPs was synthesized in a short time span, using Piper betle leaf (PBL) extract by applying microwave exposure. PB-AgNPs antibacterial activity and cell compatibility were enhanced by capping with chitosan (CS@PB-AgNPs). The synthesized nanoparticles were characterized by bioanalytical techniques. PB-AgNPs expressed significant antibacterial activity against Gram-positive and Gram-negative bacterial pathogens, while hybrid CS@PB-AgNPs presented the enhanced bactericidal activity. In addition, PB-AgNPs exhibited IC50 value of 140 μg/mL against RAW 264.7 macrophages and 100 μg/mL against lung cancer cells while, CS capping reduced its toxicity at IC50 values of 400 μg/mL and 180 μg/mL respectively were affirmed by MTT, apoptosis and DNA damage detection. Overall it was demonstrated that CS capping could be a phenomenal finding to improve the biomedical potential of AgNPs.

Highly efficient sers performance from the silver nanoparticles/graphene nanoribbons/ cellulose paper

Introduction: Metal/graphene heterojunction structure has been one of the most crucial tools in the growth of high-performance Surface-enhanced Raman spectroscopy (SERS) platform, which is appropriate for sensing applications. In this research, we developed a SERS platform, graphene nanoribbons (GNRs) decorated silver nanoparticles (AgNPs) on cellulose paper substrate, in which GNRs was synthesized by wet chemical based on unzipping process of Multi-walled carbon nanotubes (MWCNTs), then GNRs hybridized with AgNPs through magnetron sputtering method.
 Methods: The morphology of graphene nanoribbons coated-Ag (AgNPs@GNRs) was analyzed by field emission scanning electronic microscopy (FESEM) and transmission electron microscopy (TEM). The quality and thermal stability of GNRs were characterized using thermogravimetric analysis. Besides, its structure and quality were also characterized by Raman spectroscope.
 Results: The results show that the unzipping process of MWCNTs to form GNRs was strongly affected by dispersing time and stirring temperature. The suitable condition creating the Graphene Nanoribbons using MWCNTs was the dispersing time of 10 mins in an acid environment, stirring in 30 mins at room temperature and in 45 min at 100°C. Moreover, SERS platform of AgNPs@GNRs exhibit the outstanding SERS signal enhancement with rhodamine 6G (R6G) low concentration of 10-5 M compared with pristine graphene and silver thin film. This could be attributed to the synergistic effect between AgNPs, GNRs and analyze molecules based on the enhancement of electromagnetic mechanism (EM) and chemical mechanism (CM), which plays a vital role in promoting the improvement SERS behavior.
 Conclusion: Ag NPs assembled onto graphene nanoribbons/ cellulose paper substrate could also serve as SERS active substrates for practical applications in various fields at trace levels.

Photocatalytic Partial Oxidation of Tyrosol: Improving the Selectivity Towards Hydroxytyrosol by Surface Fluorination of TiO2

The photocatalytic partial oxidation of tyrosol to hydroxytyrosol, the most powerful and expensive natural antioxidant currently known, has been studied in irradiated aqueous suspensions of TiO2 as the photocatalyst. Three TiO2 samples, two commercial (Merck and P25® Evonik) and a home prepared one, have been used bare or surface modified. The influence of surface hydroxylation, surface fluorination, and silver nanoparticles decoration on the selectivity towards hydroxytyrosol has been investigated. The higher the hydroxyl group density, the lower the selectivity. On the other hand, fluorination improved the selectivity towards hydroxytyrosol for all of the samples. In particular, selectivity values up to 10%, i.e. ca. 10 times higher than those obtained with bare sample, were obtained in the presence of fluorinated P25 Evonik TiO2. It is proposed that the higher production of hydroxyl radicals and the lower hydrophilicity of the surface of the fluorinated sample favour hydroxylation of tyrosol and desorption of hydroxytyrosol, respectively, thus hindering the overoxidation of tyrosol. The presence of silver on fluorinated TiO2 was detrimental and it did not significantly improve the selectivity even on bare TiO2. Even if the selectivity hereby reported is relatively low, results show that the surface modification of the photocatalyst and the fluidodynamic optimization of the reacting system could make viable this interesting photocatalytic route of synthesis, which can be used also for the enrichment of some commercial polyphenolic solutions in the very valuable hydroxytyrosol.

Fabrication of Durably Antibacterial Cotton Fabrics by Robust and Uniform Immobilization of Silver Nanoparticles via Mussel-Inspired Polydopamine/Polyethyleneimine Coating

Bacterial contamination of cotton dressing can potentially cause wound infection. To solve this problem, stable and uniform decoration of silver nanoparticles (AgNPs) onto cotton fabrics is a promi...

Near infrared light-triggered metal ion and photodynamic therapy based on AgNPs/porphyrinic MOFs for tumors and pathogens elimination

Although metal-based agents are widely used in disease treatment, precisely controlled metal ions release is still a challenge. Here, we demonstrated a nanoplatform (PAM) to achieve on-demand activation and release of metal ions via controlling oxidation condition by near infrared (NIR) light-inducted photodynamic therapy (PDT). PAM was constructed by decorating silver nanoparticles (AgNPs) onto the porphyrinic porous coordination network (PCN) and further camouflaging with the neutrophil membrane (NM) with inflammatory targeting ability. PAM was inactive without irradiation, causing no damage to normal tissues. However, under NIR irradiation at tumor or infected tissues, PCN locally generated singlet oxygen (1O2), enabling AgNPs to be partly degraded to release cytotoxic Ag+ for metal ions therapy (MIT). Simultaneously, the incorporated AgNPs promoted the 1O2 yield of PCN due to the localized electric field effect. Consequently, the NIR light-controlled interlocking interactions between AgNPs and PCN might offer a great potential for achieving controlled, precise and efficient disease treatment with reduced side-effect.

Optical pathlength enhancement in ultrathin silicon solar cell using decorated silver nanoparticles on aluminium grating

Optical pathlength enhancement in ultrathin silicon solar cell using decorated silver nanoparticles on aluminium grating

Green synthesis of graphene based manocomposite for sensing of heavy metals

A simple and green ecofriendly approach was revealed for the synthesis of silver-reduced graphene oxide nanocomposites (Ag@rGONCs) using jambul seed extract. The synthesized composites were characterized by UV–visible spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Particle size and zeta potential analysis. The surface morphology and elemental analysis of synthesized Ag@rGONCs was done using scanning electron microscopy (SEM/EDX). The modified graphene can efficiently adsorb heavy metal ions and selectivity was precise due to presence of embedded silver ions on surface. The in situ decoration of silver ions on graphene oxide (GO) was accomplished in single step via one pot methodology using green precursor. The catalytic action of jamun seeds helps to reduce the GO to rGO and simultaneous decoration of silver nanoparticles. It also provided capping ability to avoid aggregation. The resultant nanocomposites (NCs) shown good selectivity towards the determination of Pb2+, Hg2+And Cr (VI) ions with the recognition limits of 50 nM, 15 nM and 500 nM, respectively Keywords: Graphene oxide, Green catalysis, Hevay metal sensing, Jambhul seeds.

Utilization of High throughput microcrystalline cellulose decorated silver nanoparticles as an eco-nematicide on root-knot nematodes

The present study aimed to evaluate the influence of high throughput microcrystalline cellulose embedded silver nanoparticles (Ag-NPs), as an alternative eco-nematicide on Root-knot nematode (Meliodogyne incognita), which deem the main reason toward the loss of more than 20% in crops worldwide. In this work, Ag-NPs was prepared in very high concentration. Ag-NPs prepared using such technique has many advantages such as: absence of organic or solvents, scaling up thru using high concentration of silver precursor and utilization of environmentally benign polymer; Microcrystalline Cellulose (MCC). At the beginning, the bulk Ag-NPs colloidal solution is diluted to 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80 and 100 ppm. Then, heavily galled roots of annual seed-propagated weed, Solanum nigrum L. family Solanaceae were selected to identify the Meloidogyne species and followed by treatment with the previously Ag-NPs concentrations. Results obtained after 24 h incubation, showed the highest mortality (M%) (40.36 ± 1.15%) which was achieved by means of 20 ppm of Ag-NPs compared with the highest concentration of Ag-NPs; 100 ppm (42.85 ± 3.51%). It was obviously noticed that, by increasing the concentration of Ag-NPs, M % decreased. On the other hand, after 48 h, 30 ppm Ag-NPs showed the highest M%; (52.82 ± 0.57%), while, after 72 h of treatments, the M% reached 95.53 ± 0.57% using 40 ppm Ag-NPs, then decreased to 66.67 ± 2.00% using 100 ppm Ag-NPs. All previous finding affirms the effectiveness of lower concentrations of Ag-NPs compared with the highest one, after 72 h. In conclusion, Ag-NPs could be successfully used as eco-nematicide for Root-knot nematodes; Meloidogyne incognita with a recommended dose of 20−40 ppm that is acquired higher M% and caused many aberrations during the different growth stages.

Decoration of silver nanoparticles on multi‐walled carbon nanotubes: Investigation of its anti‐acute leukemia property against acute myeloid leukemia and acute T cell leukemia

Recently, the development of carbon nanocomposites composed of carbon nanotubes and metal nanoparticles has attracted many interests because of their large potential for technological applications such as catalysts, sensors, biomedicine, and disinfection. In the present study, we described a simple chemistry method to synthesize multi‐walled carbon nanotubes (MWCNTs) decorated with silver nanoparticles (Ag‐NPs). Also, we investigated the antioxidant and anti‐acute leukemia activities against acute myeloid leukemia and acute T cell leukemia cell lines. Ag NPs‐MWCNTs were characterized and analyzed using common nanotechnology techniques including transmission electron microscopy (TEM), X‐ray diffraction (XRD), energy dispersive X‐ray spectroscopy (EDS), field emission‐scanning electron microscopy (FE‐SEM) and elemental mapping analysis. Also, 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) test was performed to assess the antioxidant capacities of AgNO3, MWCNTs, and Ag NPs‐MWCNTs. It revealed similar antioxidant potentials for Ag NPs‐MWCNTs and butylated hydroxytoluene. In MTT assay, Ag NPs‐MWCNTs had very low cell viability (very high anti‐acute leukemia properties) dose‐dependently against 32D‐FLT3‐ITD (Acute myeloid leukemia cell line), Human HL‐60/vcr (Acute myeloid leukemia cell line), Jurkat, Clone E6–1 (Acute T cell leukemia cell line), and J.RT3‐T3.5 (Acute T cell leukemia cell line) without any cytotoxicity on human umbilical vein endothelial cell line (HUVEC; Normal cell line). In conclusion, the synthesized Ag NPs‐MWCNTs revealed excellent antioxidant and cytotoxicity activities against acute myeloid leukemia and acute T cell leukemia cell lines in a dose depended manner. After confirming in thein vivoand clinical trials, these nanoparticles can be administrated in humans for the treatment of acute leukemia especially acute myeloid leukemia and acute T cell leukemia.

Protein-docking strategy boosting Raman detection sensitivity for aristolochic acid I

As one of the most potent carcinogens, aristolochic acid I (AAI) can be founded in many plants, which are widely used as raw materials in traditional Chinese medicine. Surface enhanced Raman scattering (SERS) method would be developed to detect the AAI in rapid way. However, hydrophobic AAI molecule with small scattering section hardly approaches onto the surface of metal nanoparticles, resulting in poor Raman detection sensitivity. In this work, bovine serum albumin (BSA) decorated silver nanoparticles (Ag NPs) with core-shell structure (Ag@BSA NPs) are successfully synthesized. The molecular docking induced strong interaction between BSA and AAI is validated by molecular simulation and Ag@BSA NPs could actively capture AAI and anchor the target molecule into the hot spots of Ag NPs, which greatly improves SERS response of AAI. The dynamic linear range for SERS detection of AAI is from 0.5 to 50 μM (R2 = 0.9910) and the lowest detectable concentration of 0.28 μM is reached, which meeting the strict limitation of national standard regulation for AAI in cosmetic products. In addition, the method is applied for AAI determination in skin care products and good results are achieved.

Oxidized alginate/gelatin decorated silver nanoparticles as new nanocomposite for dye adsorption

In the current article di-aldehyde alginate (DAA) crosslinking gelatin (Ge) hydrogel was prepared and investigated for stabilizing silver nanoparticles. DAA/Ge decorated silver nanoparticles hydrogel was characterized by IR, XRD, TGA, SEM and AFM. The outcomes demonstrate that silver nanoparticles with uniform sizes were homogenously distributed through DAA/Ge hydrogel. DAA/Ge decorated silver nanocomposite was examined for the rejection of methylene blue (MB) from aqueous solutions. Comparing with DAA/Ge hydrogel, the nanocomposite has high efficiency for removal of MB. The highest MB removal efficiency was observed at pH 7 and the adsorption process is well described by pseudo-second order and Langmuir adsorption model with adsorption capacity of 625 mg/g. Our results proved that the DAA/Ge/Ag nanocomposite could be used for removal of MB from decontaminated solutions.

Skin‐Inspired Antibacterial Conductive Hydrogels for Epidermal Sensors and Diabetic Foot Wound Dressings

AbstractRecently, artificial intelligence research has driven the development of stretchable and flexible electronic systems. Conductive hydrogels are a class of soft electronic materials that have emerging applications in wearable and implantable biomedical devices. However, current conductive hydrogels possess fundamental limitations in terms of their antibacterial performance and a mechanical mismatch with human tissues, which severely limits their applications in biological interfaces. Here, inspired by animal skin, a conductive hydrogel is fabricated from a supramolecular assembly of polydopamine decorated silver nanoparticles (PDA@Ag NPs), polyaniline, and polyvinyl alcohol, namely PDA@Ag NPs/CPHs. The resultant hydrogel has many desirable features, such as tunable mechanical and electrochemical properties, eye‐catching processability, good self‐healing ability as well as repeatable adhesiveness. Remarkably, PDA@Ag NPs/CPHs exhibit broad antibacterial activity against Gram‐negative and Gram‐positive bacteria. The potential application of this versatile hydrogel is demonstrated by monitoring large‐scale movements of the human body in real time. In addition, PDA@Ag NPs/CPHs have a significant therapeutic effect on diabetic foot wounds by promoting angiogenesis, accelerating collagen deposition, inhibiting bacterial growth, and controlling wound infection. To the best of the authors' knowledge, this is the first time that conductive hydrogels with antibacterial ability are developed for use as epidermal sensors and diabetic foot wound dressing.

Decoration of silver nanoparticles on activated graphite substrate and their electrocatalytic activity for methanol oxidation

Abstract Silver nanoparticles (∼30–70 nm) have been impregnated on the activated graphite powder by an electroless plating method. The so prepared silver decorated graphite powders are characterized by field emission scanning electron microscopy, powder X-ray diffraction, energy dispersive X-ray and X-ray photoelectron spectroscopy. The activated graphite powder displays a high surface coverage with tin which is essential, as this ensures a thorough and complete coating of the graphite powder with silver. The electrochemical studies of Graphite, Sn/Graphite and successive decoration of Ag–Sn/Graphite powder have been carried out using cyclic voltammetry in the potential range between −1.2 and 0.0 V at a sweep rate of 50 mV s−1 and their electrocatalytic activity for methanol oxidation has been examined in alkaline medium. The effective active surface area of Graphite and Ag–Sn/Graphite electrode are calculated to be 6.2479 × 10−5 cm2 and 6.7886 × 10−5 cm2, respectively. The impedance spectrum of the Ag–Sn/Graphite electrode displays a depressed semicircle in the high-frequency region which corresponds to low charge resistance and high capacitance. The results highlight the electrocatalytic behavior of the graphite supported silver nanoparticles, making them suitable for fuel cell applications.

Preparation, and Antibacterial Activity of Chloroacetic Acid Immobilized on Chitosan Coated Iron Oxide Decorated Silver Nanoparticles as an Efficient Catalyst for the Synthesis of Hexahydroquinoline-3-Carboxamides

Chloroacetic acid immobilized on chitosan (CS) coated iron oxide decorated by silver nanoparticles (Fe3O4@CS@Ag@CH2COOH) was synthesized as a biocompatible magnetic material. The Fe3O4@CS@Ag@CH2COOH nanocomposite was characterized using FT-IR, XRD, SEM, EDS, and TGA instruments. The surface morphology and size of Fe3O4@CS@Ag@CH2COOH nanocomposite were determined through SEM micrographs analysis. Moreover, magnetic characterization of the prepared nanocomposite was determined by VSM. The produced Fe3O4@CS@Ag and Fe3O4@CS@Ag@CH2COOH nanocomposites were screened for their antibacterial activity against gram-negative Escherichia coli and gram-positive Staphylococcus aureus. The results showed that the Fe3O4@CS@Ag and Fe3O4@CS@Ag@CH2COOH nanocomposites presented good antibacterial performance toward gram-negative Escherichia coli and gram-positive S. aureus. Furthermore, Fe3O4@CS@Ag@CH2COOH nanoparticles catalyzed one-pot synthesis of hexahydroquinoline-3-carboxamide derivatives by four-component reaction of arylaldehydes, dimedone, acetoacetanilide and ammonium acetate in ethanol at 70 °C.

Visible light enhancement of ammonia detection using silver nanoparticles decorated on reduced graphene oxide

A novel NH3 gas sensor based on reduced graphene oxide sheets (rGO) with uniformly decorated silver nanoparticles (AgNPs) on its surface is presented in this work. The aqueous solution containing silver nitrate, gelatin and graphene oxide (GO) is exposed to acoustic energy to reduce the silver nanoparticle on rGO sheets. FESEM image and EDX spot analysis show that an ultrafine spherical AgNPs with the size of about 20–30 nm are uniformly distributed on the rGO sheets. Small Raman shift of centered peaks at 1960 cm−1 indicate the decoration of AgNPs on rGO. The UV–vis absorption peaks show a red shift toward visible spectrum from 267 nm for rGO to 459 nm for rGO decorated with AgNPs. The AgNPs/rGO nano composite as an active layer over the Cr/gold interdigited electrode is fabricated using lithography technique and are tested using a semi-automatic static set up. The sensitivity of the AgNPs/rGO is about 5.8 for 250 ppb of NH3 gas detection. While this sensor shows reproducible, stable and fully recoverable response, its limit of detection (LOD) for NH3 gas is 100 ppt. The response and recovery times are 76 and 84 s respectively. The sensor exhibits an even better sensitivity of about 1.7 times for ammonium gas detection at room temperature when it is expose to visible light of 10 mW cm−2 (blue LED) which is believed to be due to the surface plasmon resonance (SPR) and spillover effects.

Study on thermal conductive PA6 composites with 3‐dimensional structured boron nitride hybrids

ABSTRACTTo develop thermally conductive PA6 composites with the aim of decreasing filler content, structure‐complexed fillers were fabricated. This research presented an effective approach by noncovalent functionalization of poly(dopamine) (PDA) followed by silver nanoparticles decoration to fabricate 3‐dimensional (3‐D) structured boron nitride hybrids (BN@PDA@AgNPs). BN hybrids were then introduced into PA6 to prepare thermally conductive PA6 composites. The results demonstrated that PA6/BN hybrids (PMB) composites exhibited higher thermal conducivity compared with PA6/BN composites, which revealed more effective construction of thermal conductive network in the composites with the addition of 3‐D structured fillers. The effects of BN hybrids with different loadings on thermal stability, mechanical property, as well as electrical resistance of the composites were also analyzed. Overall, the prepared PMB composites exhibited outstanding performance in thermal conductivity, thermal stability, mechanical property, while retaining good electrical insulating property, which showed a potential application in electronic packaging fields. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47630.

Ag NPs decorated on a COF in the presence of DBU as an efficient catalytic system for the synthesis of tetramic acids via CO2 fixation into propargylic amines at atmospheric pressure.

CO2 fixation reactions by inserting it in reactive organic compounds are very challenging for the utilization of this abundant and harmful gas present in air and thus to mitigate this greenhouse gas responsible for global warming. This can be achieved by appropriate design of functionalized porous nanocatalysts having high surface areas and porosity and good CO2 uptake capacity. Herein, we first report the decoration of silver nanoparticles (NPs) over the surface of a covalent organic framework (COF) material TpPa-1 synthesized through the polycondensation of 2,4,6-triformylphloroglucinol (TFP) and p-phenylenediamine. The resulting material Ag@TpPa-1 was thoroughly characterized by N2 adsorption/desorption, powder X-ray diffraction (PXRD), FE-SEM, TEM, UV-Vis, FT IR and thermogravimetric techniques. This Ag NP decorated porous COF in the presence of DBU exhibited excellent catalytic activity for the synthesis of tetramic acids from a variety of propargylic amine derivatives at 60 °C under atmospheric pressure of carbon dioxide via formation of oxazolidinones, where CO2 acts as a C1 reagent. The Ag@TpPa-1 catalyst exhibited excellent recycling efficiency for the synthesis of tetramic acid with no leaching of Ag from the catalyst surface.