Organic-inorganic Nanocomposites Research Articles

Surface-Engineered Nanomaterials in Water: Understanding Critical Dynamics of Soft Organic Coatings and Relative Aggregation Density

Inorganic-organic nanocomposites, typically as an inorganic core with surface organic coating(s), have received interest as potential platform materials for sensor, catalyst, sorbent, and environmental applications, among others. Here, we describe the critical role of organic surface coatings with regard to the colloidal stability of engineered manganese oxide nanoparticles (MnxOy NPs). Specifically, we prepared libraries of monodisperse MnxOy NPs with a serial selection of surface coatings (stearic acid (SA), oleic acid (OA), poly(maleic anhydride-alt-1-octadecene) (PMAO), linear polyethyleneimine (LPEI), and multibranched polyethyleneimine (BPEI)), which were chosen based on comparable structure(s) and functional group(s). We systematically evaluated the role of surface organic coatings via critical coagulation concentrations (CCCs), which were compared with theoretical calculations (Schulze-Hardy rule). Through a newly developed light scattering protocol, we observed that the effective density of nanoclusters can exceed NPs' primary (bulk) density depending on the open space(s) within organic coatings. Interestingly, PMAO-coated NPs were more stable at the point of zero charge (PZC) than at neutral pH (pH 7), despite the loss of effective surface charge potential. CCC was 334 mM in NaCl and 1.5 mM in CaCl2 at pH 7, compared to CCC values of 807 mM in NaCl and 210 mM in CaCl2 at PZC. This increase in stability is due to polymer (re)configuration (at PZC), which was further confirmed with a quartz crystal microbalance-based technique to evaluate surface-based polymer dynamics. Taken together, this work quantifies the role of organic coating dynamics, including structure, grafting density, and configuration on the colloidal stability of organic-coated NPs.

Abnormal volatile and normal stable bipolar resistive switching characteristics of hybrid nanocomposites: Morphology–defects–property ‘Relationship

The characteristics of nano-fillers in a polymer matrix have a significant influence on the microstructural, thermo-mechanical, optical, and conductivity properties of organic-inorganic nanocomposites. In this study, we investigated the influence of inorganic component – ZnO nanoparticles (NPs) on the characteristics and properties of PVA-ZnO nanocomposites which have been applied as an insulation layer in a resistive switching (RS) device. Three nanocomposites originating from three different types of ZnO NPs exhibit different RS characteristics: Abnormal volatile RS is observed with the ∼20-nm-sized spherical-like NPs (Z1) and 15–20-nm-sized mixed shaped NPs (Z2), whereas normal nonvolatile bipolar RS is observed with the 50–150-nm-sized hexagonal rod-like NPs (Z3). The concentration and size of the intrinsic defects of the ZnO NPs as well as the thickness of the PVA-ZnO interface are responsible for the different charge transport paths, operating voltage ranges, and ON/OFF switching ratios of the memory devices. Simultaneously, the distinct sizes and morphologies of the ZnO NPs can affect the nanoholes among the PVA chains and induce various fractional free volumes in the nanocomposites. It may modify the conductivity of the nanocomposite layer or the resistance ratio of the memory devices. Understanding the influence of ZnO NPs size, morphology, and defects on the characteristics of RS of PVA-ZnO nanocomposites can help in the selection and management of functional applications, especially in the data storage field.

Magnetic and optical investigation of Eumelanin-ZnO as organic-non-organic nanocomposite

Considerable interest has been devoted to zinc oxide (ZnO) based organic nanocomposites due to their exceptional properties. In this work, we investigated the structural, morphology, optical, and magnetic properties of ZnO nanoparticles doped with natural eumelanin (ZnO-Mel). The structural properties showed that the ZnO and ZnO-Mel nanocomposites have a wurtzite structure, and no secondary phase was detected, indicating that the doped natural eumelanin atoms are located within the ZnO host lattice. UV–vis measurements revealed that the band gap of ZnO increased upon incorporation of natural eumelanin. This study demonstrated that the ferromagnetic behavior of ZnO nanoparticles is a result of the incorporation of functional groups of natural eumelanin into the ZnO lattice, which changed only the properties of ZnO without changing its structure, as shown clearly by the XRD results. Changes in the properties of zinc oxide by the natural organic material eumelanin opens new horizons in organic-inorganic nanocomposites, which is a current challenge, and new applications in devices such as spintronic devices.

Ferrocene-functionalized nanocomposites as signal amplification probes for electrochemical immunoassay of Salmonella typhimurium.

Anelectrochemical immunosensor based on ferrocene (Fc)-functionalized nanocomposites was fabricatedas an efficient electroactive signal probe to amplify electrochemical signals for Salmonella typhimurium detection. The electrochemical signal amplification probe was constructed by encapsulating ferrocene into S. typhimurium-specific antimicrobial peptides Magainin I (MI)-Cu3(PO4)2 organic-inorganic nanocomposites (Fc@MI) through a one-step process. Magnetic beads (MBs) coupled with antibody were used as capture ingredient for target magnetic separation, and Fc@MI nanoparticles were used as signal labels in the immunoassays. The sandwich of MBs-target-Fc@MI assay was performed using a screen-printed carbon electrode as transducer surface. The immunosensor platform presents a low limit of detection (LOD) of 3CFU·mL-1 and a linear range from 10 to 107CFU·mL-1, with good specificity and precision, and was successfully applied for S. typhimurium detection in milk. Graphical abstract One-pot process antimicrobial peptides Magainin I-Cu3(PO4)2 organic-inorganic nanocomposites (Fc@MI) were used as ideal electrochemical signal label, integrating both essential functions of biological recognition and signal amplification. Screen-printed carbon electrode (SPCE) was used as the electrochemical system for Salmonella typhimurium detection.

New functional copolymers of 1-vinyl-1,2,4-triazole with allylamine

New water-soluble functional copolymers based on 1-vinyl-1,2,4-triazole and allylamine were synthesized under the action of free-radical initiation conditions and azobisisobutyric acid dinitrile. Сopolymers of various compositions with a molecular weight of 1287–30204 Da were obtained by varying reaction conditions. The structure, molecular weight and physicochemical properties of the copolymers were determined using elemental analysis, IR and NMR 1H-spectroscopy, gel permeation chromatography, potentiometric and turbidimetric titration, as well as dynamic light scattering and thermogravimetric analysis. It was established that the obtained copolymers, exhibiting the properties of high-resistance organic semiconductors, are characterized by a specific electrical conductivity of 10-13 – 10-14 S/cm and high resistance to thermal destruction (up to 260–280 °C). These copolymers are promising as stabilizing polymer matrices in the formation of biologically active water-soluble hybrid organic-inorganic nanocomposites.

Prospects of Coupled Organic-Inorganic Nanostructures for Charge and Energy Transfer Applications.

We review the field of organic–inorganic nanocomposites with a focus on materials that exhibit a significant degree of electronic coupling across the hybrid interface. These nanocomposites undergo a variety of charge and energy transfer processes, enabling optoelectronic applications in devices which exploit singlet fission, triplet energy harvesting, photon upconversion or hot charge carrier transfer. We discuss the physical chemistry of the most common organic and inorganic components. Based on those we derive synthesis and assembly strategies and design criteria on material and device level with a focus on photovoltaics, spin memories or optical upconverters. We conclude that future research in the field should be directed towards an improved understanding of the binding motif and molecular orientation at the hybrid interface.

Modification of polyaniline-WO3 as a noble metal-free photo electrocatalyst with (6, 6) - Phenyl-C61- butyric acid methyl ester for solar photoelectrochemical water splitting

Development of semiconductors with appropriate bandgap energies, strong light absorption, effectual charge carrier separation, and rapid transport of photogenerated electrons and holes as photoanode for photoelectrochemical (PEC) water oxidation has gained a lot of attention in the recent years. In our previous studies, the PEC performance of polyaniline-WO3 (PANI-W) nanocomposite was confirmed as a high-performance organic-inorganic photoelectrocatalyst. In this research, we modified polyaniline-WO3 photoelectrocatalyst with (6, 6)-phenyl-C61-butyric acid methyl ester (PC61BM) as an efficient fullerene derivative with high electron-accepting capability and excellent electron mobility for solar-induced water oxidation. The as-synthesized compounds were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The electrochemical measurements showed that the activity of PC61BM modified polyaniline-WO3 toward water electro-oxidation enhanced. A photocurrent density of 1.63 mAcm−2 at 1.23 V vs. RHE achieved for PANI-W-PCBM indicating ~2.5-fold improvement compared to that of PANI-W. Furthermore, the charge transfer resistance (Rct) of PANI-W-PCBM at electrode/electrolyte interface under light irradiation is 433 Ωcm2 which is 5.64 times lower than that of PANI-W (2441 Ωcm2). The modification of PANI-W nanocomposite with PC61BM suppressed the recombination of photogenerated electrons and holes and provided more active sites for oxygen evolution reaction due to the outstanding electrical conductivity, carrier mobility, and large surface area of PC61BM. Therefore, modification of organic-inorganic nanocomposite with conjugated carbon-based materials increased the PEC water splitting activity.

A sensitive biosensor for determination of pathogenic bacteria using aldehyde dehydrogenase signaling system.

Aldehyde dehydrogenase (ALDH) was first developed as an enzymatic signaling system of a biosensor for sensitive point-of-care detection of pathogenic bacteria. ALDH and specific aptamers to Salmonella typhimurium (S. typhimurium), as organic components, were embedded in organic-inorganic nanocomposites as a biosensor signal label, integrating the functions of signal amplification and target recognition. The biosensing mechanism is based on the fact that ALDH can catalyze rapid oxidation of acetaldehyde into acetic acid, resulting in pH change with portable pH meter readout. The altered pH exhibited a linear relationship with the logarithm of S. typhimurium from 102 to 108CFU/mL and detection limit of 46CFU/mL. Thus, the proposed biosensor has potential application in the diagnosis of pathogenic bacteria.

Potential Applications of Magnesium-Based Polymeric Nanocomposites Obtained by Electrospinning Technique

In the last few decades, the development of new electrospun materials with different morphologies and advanced multifunctional properties are strongly consolidated. There are several reviews that describe the processing, use and characterization of electrospun nanocomposites, however, based on our knowledge, no review on electrospun nanocomposites reinforced with nanoparticles (NPs) based on magnesium, Mg-based NPs, are reported. Therefore, in the present review, we focus attention on the fabrication of these promising electrospun materials and their potential applications. Firstly, the electrospinning technique and its main processing window-parameters are described, as well as some post-processing methods used to obtain Mg-based materials. Then, the applications of Mg-based electrospun nanocomposites in different fields are pointed out, thus taking into account the current trend in developing inorganic-organic nanocomposites to gradually satisfy the challenges that the industry generates. Mg-based electrospun nanocomposites are becoming an attractive field of research for environmental remediation (waste-water cleaning and air filtration) as well as for novel technical textiles. However, the mayor application of Mg-based electrospun materials is in the biomedical field, as pointed out. Therefore, this review aims to clarify the tendency in using electrospinning technique and Mg-based nanoparticles to huge development at industrial level in the near future.

Shape Memory and Self-Healing Nanocomposites with POSS–POSS Interactions and Quadruple Hydrogen Bonds

The organic–inorganic nanocomposites were constructed via polyhedral oligomeric silsesquioxanes (POSS)–POSS interactions and supramolecular quadruple hydrogen bonds. First, a double-decker silsesqu...

Investigations on SHG properties of LiNbO3/PMMA nanocomposites

An organic–inorganic nanocomposite (LN/PMMA) was prepared using nearly stoichiometric lithium niobate (LiNbO3; LN) nanoparticles dispersed homogeneously into a polymer matrix, poly(methyl methacrylate) (PMMA). This composite is having anisotropic LN nanocrystals, oriented randomly in an isotropic host matrix of PMMA. So far, to the best of our knowledge, different nonlinear optical (NLO) properties have been studied for organic–inorganic nanocomposites in thin film and waveguide form, the thickness of which was in micron and submicron order. In this article, for the first time, we have presented SHG properties of thick LN/PMMA nanocomposites of thickness, 0.1 mm and above. LN/PMMA nanocomposite samples of different thickness and different concentrations of LN nanoparticles were fabricated. The attenuation coefficients of these samples, measured at laser wavelengths of 1064 nm and 532 nm, show a deviation from Beer-Lambert law. In the LN/PMMA nanocomposite, the effect of the randomly oriented LN nanoparticles on second harmonic generation (SHG) has been studied as a function of (a) input pulse energy of the fundamental laser (1064 nm), (b) LN nanoparticle concentration and (c) the sample thickness. The net effect was found to be the result of two competitive phenomena; harmonic generation and different losses from LN nanoparticles. Thermal effects at high input pulse energy also play important role in second harmonic generation. Through these studies, one can get an idea about the collective behavior of LN nanoparticles, particularly effect on their linear and nonlinear optical properties, and how they can be dispersed in isotropic host matrices (to different concentration levels) to achieve the desired NLO effect.

Incorporation of quaternary ammonium chitooligosaccharides on ZnO/palygorskite nanocomposites for enhancing antibacterial activities

Quaternary ammonium chitooligosaccharides (QACOS) was incorporated onto the ZnO/palygorskite (ZnO/PAL) nanocomposite by a simple electrostatic self-assembly process to produce a new organic-inorganic nanocomposite (QACOS/ZnO/PAL) with excellent antibacterial activity. After loading QACOS, the Zeta potential of ZnO/PAL was changed from -26.7 to +30.3 mV, which facilitates to improve the targeting behavior of ZnO/PAL towards bacteria and its contact with bacteria, resulting in a significant improvement of antibacterial capability. The MIC values of QACOS/ZnO/PAL for inhibiting bacteria (0.5 mg/mL for E. coli and 1 mg/L for S. aureus) were superior to ZnO/PAL and QACOS, demonstrated an expected synergistic antibacterial effect between QACOS and ZnO/PAL. The improved contact and interface interaction between QACOS/ZnO/PAL and bacteria makes it easier to destroy the structural integrity of bacteria. As a whole, the incorporation of polysaccharide as regulators of surface charge opens up a new way to further enhance the antibacterial activity of inorganic antibacterial materials.

Cs0.32WO3/PMMA nanocomposite via in-situ polymerization for energy saving windows

Inorganic-organic nanocomposites composed of nanoparticles and polymers offer a vast space for tuning material properties have attracted considerable interest. In this work, a nanocomposite composed of Cs0.32WO3 (CWO) nanoparticles as functional additive and poly (methyl methacrylate) (PMMA) as matrix was developed for the application to energy-saving windows. The key to the process was in-situ polymerization of methyl methacrylate (MMA) monomers in the presence of CWO nanoparticles, which can effectively prevent the nanoparticles from agglomeration. As a result, a homogeneous dispersion of the nanoparticles in the PMMA matrix was obtained and the nanocomposite exhibits a high visible light transmittance (>70%), a low haze (<1%) and excellent near-infrared (NIR, 780–2600 nm) blocking ability (above 90%). Furthermore, the nanocomposite has a good stability in a high temperature/humid environment. The thermal stability and mechanical properties of the nanocomposite is remained comparable with PMMA. A model house was applied to evaluate the heat shielding performance of the nanocomposite, and the results indicate that the nanocomposite is superior to ITO glass. All of these results suggest that the proposed CWO/PMMA nanocomposite is promising for the application to energy saving windows.

Organic-inorganic hybrid coatings containing phosphorus precursors prepared by sol–gel on Ti6Al4V alloy: Electrochemical and in-vitro biocompatibility evaluation

The durability and long-term success of metallic implants are enhanced through the molecular scale design of biocompatible and corrosion resistant surface coatings. To pursue this hypothesis, we have developed a new class of organic-inorganic (O-I) hybrid nanocomposite coatings based on tetramethylorthosilicate (TMOS) and γ-methacryloxypropyltrimethoxysilane (MAPTMS) as organofunctional alkoxysilanes precursors and dimethyltrimethylsilylphosphite (DMTMSP) as a phosphorus precursor. Addition of DMTMSP to TMOS-MAPTMS hybrids increased the extent of intermolecular condensation and cross-linking observed. Both normal human osteoblast in-vitro biocompatibility and corrosion resistance were enhanced in coatings containing DMTMSP. Though increasing phosphorous content correlated with biocompatibility, a compromise in the amount of phosphorus incorporated would be required if corrosion resistance was the most desirable parameter for optimization, at least for single coat systems. Evaluation of the electrochemical behaviour and the in-vitro biocompatibility show that films prepared using these materials by dip coating onto Ti6Al4V alloys offer a promising alternative to simpler coatings and wholly metallic prostheses.

Ultra-thin and ultra-strong organic interphase in nanocomposites with supercrystalline particle arrangement: Mechanical behavior identification via multiscale numerical modeling

A key challenge in the development of inorganic-organic nanocomposites is the mechanical behavior identification of the organic phase. For supercrystalline materials, in which the organic phase ranges down to sub-nm areas, the identification of the organic materials' mechanical properties is however experimentally inaccessible. The supercrystalline nanocomposites investigated here are 3D superlattices of self-assembled iron oxide nanoparticles, surface-functionalized with crosslinked oleic acid ligands. They exhibit the highest reported values of Young's modulus, nanohardness and strength for inorganic-organic nanocomposites. A multiscale numerical modeling approach is developed to identify these properties using supercrystalline representative volume elements, in which the nanoparticles are arranged in a face-centered cubic superlattice and the organic phase is modeled as a thin layer interfacing each particle. A Drucker-Prager-type elastoplastic constitutive law with perfectly plastic yielding is identified as being able to describe the supercrystals' response in nanoindentation accurately. As the nanoparticles behave in a purely elastic manner with very high stiffness, the underlying constitutive law of the organic phase is also identified to be Drucker-Prager-type elastoplastic, with a Young's modulus of 13 GPa and a uniaxial tensile yield stress of 900 MPa, remarkably high values for an organic material, and matching well with experimental and DFT-based estimations. Furthermore, a sensitivity study indicates that small configurational changes within the supercrystalline lattice do not significantly alter the overall stiffness behavior. Multiscale numerical modeling is thus proven to be able to identify the nanomechanical properties of supercrystals, and can ultimately be used to tailor these materials' mechanical behavior starting from superlattice considerations.

Synthesis and applicability study of novel poly(dopamine)-modified carbon nanotubes based polymer electrolyte membranes for direct methanol fuel cell

Abstract Novel sulfonated polysulfone (SPS) based composite polymer electrolyte membranes (PEMs) filled with polydopamine modified carbon nanotubes (PD-CNTs) have been prepared using the phase inversion technique. The present study reports the development of novel and cost- efficient nanocomposite materials with excellent properties for polymer electrolyte membranes preparation. The progress is noteworthy towards the synthesis of economical organic-inorganic nanocomposites through which fuel cell related properties can be tailored. The applicability of prepared PEMs for direct methanol fuel cell (DMFC) has been investigated in terms of water uptake, methanol permeability, and proton conductivity by changing the filler content (0.5–1.0 wt. %). The carbon nanotubes were surface functionalized using polydopamine (PD) as the modifying agent. The resultant functionalized carbon nanotubes (PD-CNTs) have been incorporated into SPS polymer matrix to prepare the composite PEMs. The functional groups, structural properties, elemental analysis, morphological and topographical aspects of the resulting composite membranes were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Energy dispersive X-ray spectrometer (EDS), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM), respectively. It was found that PD served as an outstanding glue because of its adhesive qualities, facilitated the homogeneous dispersion of CNTs into the polymer matrix, and created new proton-conducting pathways in the subsequent membranes. A detailed analysis showed that water uptake and proton-conducting properties of the engineered PEMs have been improved significantly. Composite membarne (0.5 wt. % PD-CNTs) showed 43 % increase in proton conductivity compared to the pristine SPS membrane, increasing from 0.085 S/cm for pristin to 0.1216 S/cm for the composite membrane at 80 °C. The prepared PEMs also showed an impressive 75 % decrease in methanol permeability (5.68 × 10−7 cm2/s) compared to recast Nafion®117 membarne (23.00 × 10−7 cm2/s). These results demonstrated the immense potential of polydopamine functionalized CNTs based PEMs for DMFC application. The ability of the newly synthesized membrane to retain water, and its capability to give a structural framework for maximum proton conductivity with reduced fuel crossover towards the catalyst are the significant advances from the present study.

MCM-BP as a Novel Nanomagnetic Reusable Basic Catalyst for the one Pot Solvent-Free Synthesis of Dihydropyridine, Polyhydroquinoline and Polyhydroacridine Derivatives via Hantzsch Multicomponent Condensation Reaction

By the immobilization of bipyridinium chloride onto mesoporous MCM-41encapsulated Fe3O4 nanoparticles via a simple post-synthesis method, a totally new organic-inorganic hybrid nanocomposite was formulated. The heterogeneous hybrid nanomagnetic composite was characterized by Fourier Transform InfraRed (FT-IR), X-Ray powder Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Vibrating Sample Magnetometer (VSM) and Thermal Gravimetric Analytical (TGA). The potential applications of this novel nanomagnetic and recyclable basic nanocomposite, Fe3O4@MCM-Bp , were also investigated for solvent-free synthesis of 1,4-dihydropyridine, polyhydroquinoline, and polyhydroacridine derivatives via Hantzsch multicomponent condensation reaction. High isolated yields, operational simplicity, clean reaction conditions and minimum pollution of the environment, makes the procedure a useful and appealing process in organic transformation.

Hepatoprotective effects of silymarin coated gold nanoparticles in experimental cholestasis.

The present study reports the green synthesis of hybrid organic-inorganic gold nanocomposites using silymarin as reducing and capping agent. The structure of the silymarin loaded gold nanoparticles was investigated by using the appropriate analysis tools such as UV-Vis and Fourier-transform infrared spectroscopy (FTIR), and Transmission electron microscopy (TEM) techniques. TEM micrographs demonstrated that the gold nanoparticles were spherical in shape, well distributed and their mean size was about 10nm. The in vivo hepatoprotective and antifibrogenic properties after bile duct ligation in rats of the silymarin coated gold nanoparticles were assessed. The changes regarding the blood tests and the liver histopathology were compared to the standard administration of silymarin. Silymarin loaded gold nanoparticles improved liver function, reduced cholestasis and oxidative stress parameters, with the increase of antioxidant support, and reduced inflammation and fibrosis in the liver of rats with extrahepatic cholestasis.

Fabrication of an organic–inorganic nanocomposite carrier for enzyme immobilization based on metal–organic coordination

An organic–inorganic nanocomposite which combined mesoporous silica SBA-15 and chitosan using a carboxyl functionalized ionic liquid as the bridging agent (SBA@CS) was successfully fabricated, and was used to immobilize porcine pancreas lipase (PPL) by physical adsorption, cross-linking and metal–organic coordination, respectively. The as-prepared carriers were characterized by scanning electron microscopy, Fourier transform infrared and energy-dispersive X-ray spectroscopy. Compared with immobilization onto the pure mesoporous silicon material SBA-15, all the batches of PPL immobilized onto organic–inorganic nanocomposites showed higher activity, improved stability and reusability as well as better resistance to pH and temperature changes. Among the immobilized PPLs, immobilization based on Co2+ coordination (SBA@CS-Co-PPL) produced the best enzymatic properties. The maximum immobilization efficiency and specific activity of 79.6% and 1975.8 U g−1 were obtained with SBA@CS-Co, separately. More importantly, the activity of immobilized enzyme can still maintain 84.0% after 10 times of reuse. These results demonstrated that thus prepared organic–inorganic nanocomposite could be an ideal carrier for enzyme immobilization by metal–organic coordination.

Fabrication of bacteriochlorin shell/gold core nanoparticles for the sensitive determination of trichlosan using differential pulse voltammetry

The triclosan contamination in daily life has attracted great attention, and there is rare electroanalytical assay based on π-system dyes. In this work, a facile preparation and electroanalytical application of an organic dispersion containing bacteriochlorin dyes (LS11) and gold nanoparticles (AuNPs) was proposed. The organic-inorganic hybrid nanocomposites were characterized by transmission electron microscope (TEM) showing a core–shell structure with a uniform layer of dye molecules. The as-prepared nanocomposites were successfully coated onto glassy carbon electrodes, and the surface characteristics of the top most layer of the modified electrodes were examined by atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM) and water contact angle experiments. The nanocomposite film-modified electrodes exhibited good electrochemical activity towards oxidation of triclosan. The oxidation of adsorbed triclosan occurred at a reduced overpotential, and the anodic current responses under a pre-concentration step prior to the potential scan were used for quantitative analysis. A good linear relationship from 0.01 μM to 0.5 μM was obtained using differential pulse voltammetry. The sensitivity and detection limit (S/N = 3) were 23.69 μA μM−1 and 0.03 μM, respectively. The proposed assay was applied to detect triclosan in two personal hygiene products using standard addition method, and the results showed good recoveries that ranged from 96.6% to 101.5% and from 99.3% to 103.8% for a toothpaste sample and a hand wash sample, respectively. A reference HPLC-UV method was used to evaluate the proposed electroanalytical method, and a good agreement was achieved.