Electrochemical Nitrite Sensor Research Articles

Fabrication of highly sensitive nitrite electrochemical sensor in foodstuff using nanostructure sensor

Fabrication of highly sensitive nitrite electrochemical sensor in foodstuff using nanostructure sensor

Self-assembled AuNPs on sulphur-doped graphene: a dual and highly efficient electrochemical sensor for nitrite (NO2−) and nitric oxide (NO)

Gold nanoparticles self-assembled over sulphur-doped graphene as a reusable electrocatalyst for selective and sensitive quantification of NO2− and NO.

A sensitive and selective electrochemical nitrite sensor based on a glassy carbon electrode modified with cobalt phthalocyanine-supported Pd nanoparticles

Cobalt phthalocyanine supported palladium nanoparticle composite materials have been used to modify a glassy carbon electrode to fabricate a sensitive and selective electrochemical nitrite sensor.

Enhanced electrocatalytic nitrite determination using poly(diallyldimethylammonium chloride)-coated Fe1.833(OH)0.5O2.5-decorated N-doped graphene ternary hierarchical nanocomposite

To develop simple and sensitive electrocatalytic technique for toxic nitrite determination is significantly important. Electrochemical nitrite sensor has attracted tremendous attention owing to its high sensitivity, selectivity and short response time. Here, we report the highly sensitive nitrite sensor based on poly(diallyldimethylammonium chloride) (PDDA)-coated Fe1.833(OH)0.5O2.5-decorated N-doped graphene (NG) ternary hierarchical nanocomposite (Fe1.833(OH)0.5O2.5/NG@PDDA). Differing from complicated synthetic routes for the reported ternary systems, the Fe1.833(OH)0.5O2.5/NG@PDDA composite can be effectively constructed by a facile one-pot hydrothermal method. The electrochemical performance of Fe1.833(OH)0.5O2.5/NG@PDDA composite film modified glassy carbon electrode was investigated by cyclic voltammetry and amperometric techniques. The experimental results indicate that synergistic effect of Fe1.833(OH)0.5O2.5 as catalytic center, NG as conductive platform and PDDA as nitrite adsorbent can significantly enhance the electrochemical response. The fabricated sensor exhibits the excellent analytical performance for nitrite detection linearly over two different concentration ranges, which are from 0.1 to 347μM and from 347 to 1275μM with a detection limit of 0.027μM (S/N=3). The value is very much comparable to the recent literature ones. Moreover, the proposed electrochemical sensor also shows good stability, reproductivity and excellent anti-interference ability against metal ions and electroactive species, and exhibits satisfactory recovery for detecting nitrite in drinking water.

Selective and Sensitive Nitrite Sensor Based on Glassy Carbon Electrode Modified by Silver Nanochains

AbstractHerein, we report a facile method for the synthesis of silver nanochains (Ag nanochains) using pyridine as growth directing agent and citrate ions as capping agents in alkaline medium. The characterization of the synthesized high aspect ratio Ag nanochains was accomplished with the help of Transmission Electron Microscopy (TEM) and High Resolution Transmission Electron Microscopy (HRTEM) which demonstrates the thickness below 100 nm. Crystalline nature of the synthesized Ag nanochains was investigated using X‐ray diffractrometry. A sensitive electrochemical nitrite sensor was assembled using synthesized Ag nanochains as electrode modifier. An improved cyclic voltammetric response for the oxidation of nitrite ions was witnessed at the modified GCE surface in comparison to bare GCE in Britton Robinson (BR) buffer (pH 4). The influence of pH on the oxidation peak current of nitrite ions was also examined using cyclic voltammetry. The electrocatalytic oxidation currents attained through amperometric measurements at Ag nanochains modified GCE were linearly dependent on the concentration of nitrite ions in the two ranges of 0.5–7.5 µM, 5–480 µM. Linear calibration plots of Ip vs. concentration of nitrite were also constructed at the proposed sensor using square wave voltammetry and differential pulse voltammetry. The proposed sensing strategy was successfully employed for the determination of nitrite in water samples with excellent recoveries.

Sensitive and selective nitrite sensor based on phosphovanadomolybdates H6[PMo9V3O40], poly(3,4-ethylenedioxythiophene) and Au nanoparticles

An electrochemical sensor for nitrite based on Keggin-type polyoxometalate H6[PMo9V3O40] (PMo9V3), poly(3,4-ethylenedioxythiophene) (PEDOT) and Au nanoparticles (AuNPs) were fabricated by a combination of electrodeposition with self-assembly approach. The experimental results of cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS) show that this kind of novel and facile strategy endows the composite film sensor faster electron transfer rate, higher electrocatalytic activity to oxidation of nitrite and high stability. The sensing performance of this sensor was explored using current-time test. Wide linear range of nitrite concentration, low limit of detection (LOD) and fast response time were obtained to be 2.5×10−9M–1.43×10−3M and 1.0×10−9M (S/N=3) and 0.6s, respectively, which are much better than most as-reported nitrite sensors. This sensor is also free of interference by KBrO3, KIO3, Na2SO4, CaCl2, ascorbic acid and glucose at 0.6–1.0V. Furthermore, the nitrite sensor was successfully employed for determination of nitrite in five real samples detection, including tap water, mineral water, apple juice, milk and yogurt, with a recovery range of 99.71%–102.64%, which indicates that the sensor can be applied into practical water and drinks detection.

ChemInform Abstract: Preparation of Hexagonal BN Whiskers Synthesized at Low Temperature and Their Application in Fabricating an Electrochemical Nitrite Sensor.

AbstractHexagonal BN whiskers are prepared via a polymeric precursor made from a 3:1 molar solution of H3BO3 and melamine (1.

A chitosan–Pt nanoparticles/carbon nanotubes-doped phosphomolybdate nanocomposite as a platform for the sensitive detection of nitrite in tap water

A polyoxometalate-based composite film decorated with CNTs and Pt–CHIT NPs was constructed on an electrode using the LBL self-assembly method. It acted as an electrochemical nitrite sensor with greatly enhanced electron transfer ability and sensing performance.

Preparation of hexagonal BN whiskers synthesized at low temperature and their application in fabricating an electrochemical nitrite sensor

Hexagonal boron nitride (h-BN) whiskers were synthesized via the polymeric precursor method using boric acid (H3BO3) and melamine (C3H6N6) as raw materials at 1073–1273 K in flowing nitrogen/hydrogen (5% hydrogen).

“Green Electrodes” Modified with Au Nanoparticles Synthesized in Glycerol, as Electrochemical Nitrite Sensor

AbstractA new environmentally friendly Au nanoparticles (Au NPs) synthesis in glycerol by using ultraviolet irradiation and without extra‐added stabilizers is described. The synthesis proposed in this work may impact on the non‐polluting production of noble nanoparticles with simple chemicals normally found in standard laboratories. These Au NPs were used to modify a carbon paste electrode (CPE) without having to separate them from the reaction medium. This green electrode was used as an electrochemical sensor for the nitrite detection in water. At the optimum conditions the green sensor presented a linear response in the 2.0×10−7–1.5×10−5 M concentration range, a good detection sensitivity (0.268 A L mol−1), and a low detection limit of 2.0×10−7 M of nitrite. The proposed modified green CPE was used to determine nitrite in tap water samples.

A New Bifunctional Electrochemical Sensor for Hydrogen Peroxide and Nitrite Based on Bimetallic Porphyrin MOF

Metalloporphyrin molecules are excellent candidates to act as molecular building blocks for the construction of MOFs, because of various functional group substituents in the periphery of the molecule and the huge variety of available derivatives incorporating different centre-coordinated metals.[1] in this work, a new bimetallic porphyrin MOF, [Cu2(Co-TCPP)(H2O)2]·0.5DMF·5H2O (Cu-CoTCPP), consisting of [5,10,15,20-(4-carboxy-phenyl)porphyrin]Co(II) (CoTCPP) struts which were bound by Cu(II)-carboxylate clusters (Cu2(COO)4), was prepared solvothermally and characterized by various techniques, including XRD, IR, elemental analysis, TG, and TEM. Cu-CoTCPP showed novel bifunctional electrocatalytic ability toward both the reduction of H2O2 and the oxidation of NaNO2 which might be due to Cu and Co, respectively. With the assistance of multi-walled carbon nanotubes (MWNTs), Cu-CoTCPP showed greatly improved sensing performance in the determination of H2O2 and NaNO2. Cu-CoTCPP/MWNTs/GCE also showed fast response, and high selectivity, steadiness and reproducibility. Excellent determination performance and high biocompatibility make the metalloporphyrin functionalized MOFs promising in electrochemical biosensing. Keywords: porphyrin MOF , bimetallic, electrochemical sensing [1] LI, Q. W., ZHANG, W. Y., MILJANIC, O. S., SUE, C. H., ZHAO, Y. L., LIU, L. H., KNOBLER, C. B., STODDART, J. F. & YAGHI, O. M. 2009. Docking in Metal-Organic Frameworks. Science, 325, 855-859. The authors thank National Natural Science Foundation of China (Grant No. 21175068) for the financial support.

An electrochemical sensor for hydrazine and nitrite based on graphene–cobalt hexacyanoferrate nanocomposite: Toward environment and food detection

Hydrazine and nitrite are well known as carcinogenic substances, which however, are commonly used in chemical industry and food processing. Monitoring of such two species in water and food is necessary. Here, we report a convenient electroanalytical method for detection of hydrazine and nitrite by facile preparation of graphene–cobalt hexacyanoferrate nanocomposite through a two-step electrode surface functionalization. The morphology and constituent of the prepared nanocomposite were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Cyclic voltammetry was used to profile the electrochemical behaviors of hydrazine and nitrite, revealing the synergetic electrocatalytic function of reduced graphene oxide and cobalt hexacyanoferrate nanoparticles. This was confirmed by the decreased oxidation overpotentials and increased current response of the target analytes, and thus offered a premise for electroanalysis. The quantitative measurements were carried out by amperometry and differential pulse voltammetry, respectively. Moreover, the analytical utility was demonstrated by determination of water samples and pickled food; the average recovery was found to be from 92.2% to 108%, with the relative standard deviation (RSD) less than 7.8%. The present method opens an avenue for detection of potential carcinogens in relation to environment and food territory.

Development of a novel nitrite electrochemical sensor by stepwise in situ formation of palladium and reduced graphene oxide nanocomposites

Sensitive electrochemical nitrite sensors based on in situ stepwise formation of Pd nanoparticles and reduced graphene oxide on electrodes.

A new bifunctional electrochemical sensor for hydrogen peroxide and nitrite based on a bimetallic metalloporphyrinic framework.

Metalloporphyrinic frameworks have been studied in many fields. However, their electrochemical properties were seldom reported. This work reports the synthesis and the electrochemical application of a new bimetallic metalloporphyrinic framework, [Cu2-Co[5,10,15,20-(4-carboxyphenyl)porphyrin](H2O)2]·0.5DMF·5H2O (Cu-CoTCPP) in which [5,10,15,20-(4-carboxyphenyl)porphyrin]Co(ii) (CoTCPP) struts are bound by Cu(ii)-carboxylate clusters (Cu2(COO)4). Cu-CoTCPP was synthesized by the solvothermal method and characterized by various techniques, including XRD, IR, UV-vis, elemental analysis, TG, and TEM. Cu-CoTCPP showed novel bifunctional electrocatalytic ability toward the reduction/oxidation of H2O2 and the oxidation of NaNO2, which might be due to Cu and Co central ions, respectively. With the assistance of multi-walled carbon nanotubes (MWCNTs), Cu-CoTCPP showed further improved sensing performance toward H2O2. The linear detection ranges of the Cu-CoTCPP/MWCNTs/GCE for H2O2 and NaNO2 are 5.0 × 10-7 to 1.8 × 10-4 M and 2.5 × 10-6 to 1.1 × 10-3 M, respectively, with the detection limits of 2.4 × 10-7 M and 1.7 × 10-7 M, and the sensitivity of 168 and 439 mA mol-1 L cm-2. The bifunctional electrocatalytic ability and the excellent performance imply that the metalloporphyrinic frameworks are promising candidates for fabricating electrochemical sensors.

Preparation of a Nitrite Electrochemical Sensor Based on Polyaniline/Graphene-Ferrocenecarboxylic Acid Composite Film Modified Glass Carbon Electrode and its Analytical Application

A sensitive and stable electrochemical sensor based on polyaniline/graphene-ferrocenecarboxylic acid (PANI/GR-FCA) composite film modified glass carbon electrode for determination of nitrite was presented and its morphology and structure were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques were used to investigate the electrochemical behavior of the nitrite oxidation, which exhibited an enhanced voltammetric response at the modified electrode. In the optimal condition, the oxidation of nitrite in Britton-Robinson buffer solution (BR) of pH 4.0 had the higher peak current than the bare electrode. A linear calibration curve over the concentration range 0.4-300 µmol L-1 of nitrite were obtained with a linear regression equation I (µA) = 0.1589 + 0.0020C (µmol L-1) (R = 0.9991, n = 13) and the detection limit was down to 0.02 mmol L-1 (S/N = 3). The recoveries of all determinations ranged between 96-102%. At the same time, the modified electrode showed a good long-term stability and reproducibility for determination of nitrite, as well as high selectivity.

A nitrite electrochemical sensor based on electrodeposition of zirconium dioxide nanoparticles on carbon nanotubes modified electrode

A nitrite electrochemical sensor based on electrodeposition of zirconium dioxide nanoparticles on carbon nanotubes (MWCNTs) modified gold electrode was proposed. Scanning electron microscope and energy-dispersive X-ray spectroscopy analysis were used for the characterization of ZrO2/MWCNTs composite. Electrochemical experiments showed that the proposed ZrO2/MWCNTs composite-modified electrode exhibited excellent electrocatalytic properties for nitrite. The potential utility of electrodes constructed was demonstrated by applying them to the analytical determination of nitrite concentration. An optimized limit of detection of 0.3 μM was obtained at a signal-to-noise ratio of three and with a fast response time (within 3 s). Additionally, the ZrO2/MWCNTs/Au electrodes exhibited a wide linear range from 0.5 to 1,115.5 μM and high sensitivity. The simple fabrication, high stability, and low cost of the modified electrode are the promising features of the proposed sensor.

Highly sensitive electrocatalytic detection of nitrite based on SiC nanoparticles/amine terminated ionic liquid modified glassy carbon electrode integrated with flow injection analysis

Herein, we report a new chemically modified electrode as highly sensitive and selective amperometric nitrite sensor based on a nanocomposite containing an amine-terminated ionic liquid (1-(3-Aminopropyl)-3-methylimidazolium bromide) and silicon carbide nanoparticles (NH2-IL/SiCnp). The scanning electron microscopy (SEM) technique was used to examine the morphology of NH2-IL/SiCnp modified glassy carbon (GC) electrode. It was found that SiCnp/IL layer was uniformly formed on the electrode surface. The modified electrode showed excellent electrocatalytic activity toward nitrite oxidation compared to the bare GC, NH2-IL/GC and SiCnp/GC electrodes. The nitrite oxidation peak current (Ip) at NH2-IL/SiCnp/GC was 3.5 and 1.6-fold higher than that of bare GC and SiC/GC electrodes, respectively, with the peak potential appeared at +0.77V, roughly 180 and 60mV lower potential than bare GC and SiCnp/GC electrodes, respectively. Linear relationship between amperometric current response and nitrite concentration was observed in the range from 50nM to 350μM and the limit of detection was 20nM (S/N=3). In addition, the modified electrode has an excellent anti-interference property in the presence of other potential interfering species as well as a good operational stability and good antifouling properties. The nitrite detection ability of the NH2-IL/SiCnp/GC electrode was further demonstrated using flow injection analysis (FIA). The repeatability of the electrode response in the flow injection analysis (FIA) configuration was evaluated as 2.2% (n=12), and the detection limit of the method was estimated to be 0.3μM (S/N=3). Based on the above results, the proposed system appears to be a highly efficient platform for the development of sensitive and stable nitrite electrochemical sensor.

Facile preparation of poly (diallyldimethylammonium chloride) modified reduced graphene oxide for sensitive detection of nitrite

In this communication, a sensitive electrochemical nitrite sensor was constructed based on poly (diallyldimethylammonium chloride) (PDDA) functionalized reduced graphene oxide (PDDA-rGO). The preparation of PDDA-rGO is quite facile, and the PDDA-rGO exhibits good dispersity and high stability in water, together with good conductivity and positive surface charge. All these factors lead to a greatly enhanced catalysis of PDDA-rGO for the nitrite oxidation compared with that of unmodified rGO or bare glassy carbon electrode. Based on PDDA-rGO, an electrochemical nitrite sensor with low overpotential (0.75V), wide linear range (0.5μM–2mM), low detection limit (0.2μM), good stability and selectivity was fabricated, which exhibited satisfied recovery for detecting nitrite in drinking water.

An Electropolymerized Rhodamine B sensing Film-Based Electrochemical Sensor for Nitrite with High Sensitivity and Selectivity

An Electropolymerized Rhodamine B sensing Film-Based Electrochemical Sensor for Nitrite with High Sensitivity and Selectivity

A promising electrochemical sensing platform based on a silver nanoparticles decorated copolymer for sensitive nitrite determination

In this paper, we report a facile route to synthesize silver nanoparticles (Ag NPs) incorporated into a copolymer of methyl methacrylate (MMA) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) (abbreviated as P(MMA-co-AMPS)) and its application to construct an electrochemical nitrite (NO2−) sensor. The copolymer nano-composite material (Ag–P(MMA-co-AMPS) is characterized by means of transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, UV-vis spectroscopy, X-ray powder diffraction methods, thermogravimetric analysis and electrochemical impedance spectroscopy. Further, Ag–P(MMA-co-AMPS) is used to prepare an electrochemical sensing platform (ESP) on a glassy carbon electrode (GC) surface. NO2− is electrocatalytically oxidized at the ESP (GC/Ag–P(MMA-co-AMPS), which leads to a sensitive determination of NO2−. The oxidation current of NO2− is linear to its concentration in the range of 1.0–100 000.0 μM and the detection limit is found to be 0.2 μM with a sensitivity 104.6 μA mM−1 cm−2. The observed analytical parameters such as wide linear range, low detection limit, high sensitivity and short response time are comparable or superior to other previously reported NO2− sensors. Kinetic parameters are evaluated using cyclic voltammetry and chronoamperometry. Finally it is demonstrated that the proposed sensor can be used for the selective determination of NO2− present in water samples and the results are quite promising.