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Ultrasonic-Assisted Synthesis of a Zn(II) Coordination Polymer in Aqueous Media and Its High-Performance Luminescent Sensing for 2,4,6-Trinitrophenol
摘要： A novel Zn(II) coordination polymer based on 5-(3-pyridyl)-1,3,4-oxadiazole-2-thiol (Hpzt), namely [Zn(pzt)2]n or (Zn-CP), was synthesized by two different synthetic methods. The bulk polycrystals and single-crystals of Zn-CP were obtained by the conventional solvothermal method at 90°C. The Zn-CP exhibits a two-dimensional (2D) coordination network that contains the uncoordinated Lewis basic sites within each layer. Interestingly, a simple environmentally friendly sonochemical synthesis of the Zn-CP in an aqueous media could be performed at room temperature. The optimal synthetic conditions were studied. The uniform microplates of Zn-CP were obtained within 30 min with the addition of pyridine, acting as a sized modulator and a deprotonating reagent. The influence of the amount of the modulator and the sonication time on their crystalline size was investigated. Moreover, the Zn-CP suspension in an ethanolic media has been used as a luminescence sensor for the detection of nitroaromatic compounds. It shows highly selective and sensitive sensing of 2,4,6-trinitrophenol (TNP) through the quenching (turn off) process under the UV light. Also, the Zn-CP microplates show the higher dispersibility and more stable suspension than those of bulk products causing an increase of the luminescent sensing performance for TNP.
关键词： 2,sonochemical synthesis,4,Zn(II),Coordination polymer,luminescence,6-trinitrophenol
更新于2025-11-19 16:46:39
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Preparation of graphene nanoribbons (GNRs) from twisted structure carbon nanotubes using unzipping technique
摘要： This work deals with the preparation of graphene nano ribbons (GNRs), which are small bars or strips of graphene with narrow range width less than 50 nm and one atom thick sheet (approximately 140 °A). This material has many applications in electronics, polymer composite, contrast agent bio-imaging and others. This material was prepared from twisted structure of carbon nanotubes CNTs using oxidation process by acids and breaking down by high frequency ultrasonication (sonochemical unzipping). Pre-prepared twisted CNTs were characterized by scanning electron microscope (HRSEM) before treatment. The size, morphology, crystallinity of prepared graphene nanoribbons was also investigated using transmission electron microscope, high resolution transmission electron microscope, and X-ray diffraction and particle size analyzer. The results showed of formation of GNRs with narrow width as lower than 29 nm and uniform sizes. X-ray diffraction reveals Bragg reflections corresponding to the lattice planes (002), (100), (101), (004), and (110) matched with hexagonal system of graphite.
关键词： sonochemical unzipping,Twisted carbon nanotubes,graphene nanoribbons
更新于2025-09-23 15:23:52
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Characterization of atypical polyaniline nano-structures prepared via advanced techniques
摘要： Conductive polymers had been the topic of a vast number of investigations during the last decades, so, the synthesis of conducting polymers and study of their physical properties has been of prime importance. One of these conductive polymers is polyaniline. The current work is to prepare polyaniline (PANI) nanostructured material via four different preparation techniques which were sol-gel, rapid mixing, sonochemical and supercritical carbon dioxide (SC-CO2) assisted polymerization. The morphology of the prepared PANI samples was determined using Transmission electron microscopy (TEM) and Scanning Electron Microscope (SEM). The molecular structure of prepared PANI samples was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The electrical conductivity of the synthesized samples was assessed by using the four-probe method at room temperature. The surface area of the prepared samples was determined using Brunauer Emmett Teller (BET). The characterization results of the prepared PANI con?rm that the morphology, chemical composition, crystallinity, conductivity and surface area were altered signi?cantly as a consequence of its synthesis via atypical techniques.
关键词： Supercritical carbon dioxide assisted polymerization,Nanoparticles,Sonochemical,Polyaniline nano-structures,Nano?bers,Polyaniline characterization,Nanorods,Sol gel,Rapid mixing polymerization
更新于2025-09-23 15:23:52
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Mini submersible pump assisted sonochemical reactors: Large-scale synthesis of zinc oxide nanoparticles and nanoleaves for antibacterial and anti-counterfeiting applications
摘要： Low cost, environmentally friendly and industrial-scale approaches for the synthesis of anti-counterfeiting and antibacterial materials are a challenging task. The current research reports novel and inexpensive approaches for the synthesis of zinc oxide nanostructures (ZnO-NSs) using Mini Submersible Pump (MSP) assisted sonochemical reactors. Zinc oxide nanoleaves (ZnO-NLs) were synthesized using MSP assisted sonochemical mixing reactor at gram-scale (4 g). Zinc oxide nanoparticles (ZnO-NPs) were synthesized using MSP assisted sonochemical flow loop reactor at gram-scale (11.5 g). Synthesized ZnO-NSs were characterized by UV-visible spectroscopy, fluorescence spectroscopy, XRD, FTIR, TGA, BET, FEG-SEM, and FEG-TEM. Bare ZnO-NPs and ZnO-NPs coated cotton fabric showed high antibacterial activity against diseases causing Gram-positive bacteria Staphylococcus aureus. Based on the UV fluorescence property of the ZnO-NLs, invisible security ink was developed for anti-counterfeiting applications. The invisible security ink was tested as a rubber stamp and fountain pen inks which were found to be stable on the various kinds of microporous papers. As compared to our previously reported method, disperser assisted sonochemical approach for ZnO-NLs synthesis; the current approach reduces the cost of equipment used from ~1700 to 4 USD. Both reactors are designed simply (less complicated), based on an environmentally friendly approach, highly scalable, increases the effectiveness of the sonochemical technique and suitable for industrial applications.
关键词： antibacterial,anti-counterfeiting,sonochemical reactors,Mini submersible pump,zinc oxide nanoparticles and nanoleaves
更新于2025-09-23 15:22:29
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Enhancement of luminescence intensity and spectroscopic analysis of Eu3+ activated and Li+ charge-compensated Bi2O3 nanophosphors for solid-state lighting
摘要： The present work reports the synthesis, characterization, photoluminescence and photocatalytic activity of Eu3+ (1-11 mol %) doped and Li+ (0.5-5 mol %) co-doped Bi2O3 nanophosphors (NPs) by sonochemical method. The average particle size was estimated using powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM) and found to be in the range of 30 to 35 nm. The scanning electron microscopy (SEM) images were highly dependent on sonication time and concentration of Epigallocatechin gallate (EGCG) bio-surfactant. The energy gap of doped and co-doped Bi2O3 nanophosphors was estimated using Kubelka-Munk (K-M) function and found to be in the range 2.9-3.08 eV. The effect of Li+ co-doping on luminescence of optimized Bi2O3:Eu3+ was studied and found about more than 3 fold enhancement of emission intensity. Judd–Ofelt parameters (Ω2, Ω4 and Ω6), transition probabilities (AT), quantum efficiency (η), luminescence lifetime (τrad), color chromaticity coordinates (CIE) and correlated color temperature (CCT) values were estimated from the emission spectra and discussed in detail. The estimated CIE chromaticity co-ordinates were very close to the NTSC (National Television Standard Committee) standard value of red emission. The synthesized NPs show excellent photocatalytic activity of Acid red-88 under UV-light irradiation, which can degrade 98.1 % in 60 min. The decreasing electron-hole pair recombination rate with quick electron transfer ability was predominantly ascribed to the balance between crystallite size, morphology, band gap, defects, surface area etc. These results through a light for the use of sonochemical route of Bi2O3:Eu3+:Li+ in solid state display and photocatalytic applications.
关键词： Photoluminescence,Sonochemical,Bi2O3:Eu3+:Li+,Photocatalysis,CIE n CCT
更新于2025-09-23 15:21:21
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Surfactant assisted sonochemical synthesis of zinc tungstate nanoparticles: Anode for Li-ion battery and photocatalytic activities
摘要： Herein, we report a simple, economic and low-cost surfactant assisted sonochemical synthesis of ZnWO4 nanoparticles. The structural and morphological features of nanoparticles were characterized by X-ray di?raction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy, photoluminescence (PL) spectroscopy and transmission electron microscopy. ZnWO4 had been proven to be one of the most promising electrodes for energy storage and found that the discharge capacity was of 173 mA h g?1 even after 20 cycles at 0.1C rate. In addition to this, good photocatalytic degradation e?ciency (98.6% in 120 minutes) was also achieved through Rhodamine B as a model of pollutant system.
关键词： photocatalytic activities,Rhodamine B,sonochemical synthesis,Li-ion battery,ZnWO4 nanoparticles
更新于2025-09-23 15:19:57
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Synthesis?of?MgTiO <sub/>3</sub> ?Nanoparticles?for?Photocatalytic?Applications
摘要： Magnesium titanate (MgTiO3) has been successfully synthesized via the sonochemical method by using TiO2 (P25) and Magnesium nitrate (MgNO3)2.6H2O as precursors without any additional phases such as MgTi2O5 and Mg2TiO4. The synthesized nanoparticles were well characterized by optical methods using UV-Vis diffuse reflectance spectroscopy (DRS) and Photoluminescence spectroscopy (PL). The morphology of MgTiO3 nanoparticles is irregular in shape with serious agglomerations were confirmed through SEM analysis. XRD confirms crystal structure and phase purity of MgTiO3 nanoparticles calcined at 700 °C for 2 hours. The calculated band gap energy of MgTiO3 nanoparticles has been found to be 3.05 eV. Using the prepared MgTiO3 nanoparticles, the photocatalytic activities were evaluated by following the degradation of Congo red dye under visible light. Moreover, the influence of various scavengers on the photocatalytic reaction were studied.
关键词： MgTiO3,Scavengers,Congo red,Nanoparticles,Photocatalytic degradation,Sonochemical
更新于2025-09-19 17:15:36
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Sonochemical synthesis of a 2D–2D MoSe <sub/>2</sub> /graphene nanohybrid electrode material for asymmetric supercapacitors
摘要： Molybdenum selenide (MoSe2) nanosheets are prepared by a simple and facile sonochemical route. To optimize the synthesis process, the sonication is tested at three different time durations (15, 30 and 45 min) with a constant power of 500 W. In order to improve the electrochemical performance of the exfoliated MoSe2 nanosheets, we report the hybridization of 2D-MoSe2 with 2D-graphene by a simple solvothermal method. The exfoliated MoSe2 nanosheets are perpendicularly oriented on the surface of the graphene nanosheets. These MoSe2 nanosheet edges have a large number of electrochemically active sites, and the graphene sheets provide effective mass transportation of ions at the electrode–electrolyte interface. Cyclic voltammetry reveals the pseudocapacitive behaviour of a MoSe2/graphene nanohybrid based electrode. From galvanostatic charge–discharge studies, the specific capacitance is found to be 945 F g?1 at a current density of 1 A g?1. An asymmetric supercapacitor (ASC) device is fabricated, which delivers a specific capacitance of 75 F g?1 (@1 A g?1) with an energy density of 26.6 W h kg?1 and a power density of 0.8 kW kg?1, and it retains 88% of its capacitance even after 3000 cycles.
关键词： MoSe2,asymmetric supercapacitor,sonochemical synthesis,graphene,nanohybrid,electrochemical performance
更新于2025-09-19 17:15:36
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Sonochemical Reaction to Control the Near Infrared Photoluminescence Properties of Single-Walled Carbon Nanotubes
摘要： The effect of ultrasonic irradiation on the optical properties of single-walled carbon nanotubes (SWNTs) was investigated. Upon sonication in D2O in the presence of sodium dodecylbenzene sulfate (SDBS) under air, red-shifted photoluminescence (PL) peaks at ~1043 and ~1118 nm were observed from aqueous suspensions of (6,4) and (6,5)SWNTs, accompanied by a decrease in the intensity of the intrinsic PL peaks. Upon sonication with SDBS under Ar atmosphere, the rate of spectral change increased with the sonication time and new PL peaks emerged at 1043, 1118, and 1221 nm. Meanwhile, upon the addition of 1-butanol, PL peaks emerged only at 1043 nm and 1118 nm, while the emergence of that at 1221 nm was inhibited. On the other hand, a suspension with highly dispersed SWNTs was obtained upon sonication in the presence of sodium cholate without any change in the intrinsic optical properties of SWNTs. These experimental results reveal that the PL characteristics of SWNTs can be controlled by controlling the sonication conditions such as the type of surfactant used, the concentration of SWNTs, reaction environment, and the presence of an inhibitor such as 1-butanol.
关键词： single-walled carbon nanotubes,surfactant,sonochemical reaction,photoluminescence,ultrasonic irradiation
更新于2025-09-19 17:13:59
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Modification of P25 titania in presence of hydrazine for <i>Staphylococcus aureus</i> inactivation
摘要： Titania and its polymorphs are one of the most studied semiconductor photocatalyst. Herein, the P25 titania was used as a precursor to modify the phase and structure with microwave assisted hydrothermal and sonochemical methods in presence of alkaline hydrazine. The outcome results show the cotton ball structure titanate composite phases (nanotubes, nanosheets and nanoparticles) and monoclinic titanate phase (TiO2-B) with microwave assisted hydrothermal method and sonochemical method, respectively. The nitrogen doping was confirmed by FTIR and DRS in modified TiO2. And some visible light absorption was observed in modified TiO2 due to the nitrogen doping. The composite phase titanate having cotton ball structure was found to be efficient for methicillin-resistant superbug Staphylococcus aureus (MRSA) inactivation. Herein, we also reported the submicron TiO2-B sword like morphology fabricated by sonochemical method for the first time in presence of alkaline hydrazine.
关键词： Bacterial inactivation,Titania,Sonochemical,Microwave assisted hydrothermal
更新于2025-09-10 09:29:36